December 21, 2004

Revision 1: September 25, 2008 747-53A2500

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ALERT ALERT

Commercial

Airplane

Group 747

ALERT ALERT

Service Bulletin

Number: 747-53A2500

Date: December 21, 2004

Revision 1: September 25, 2008

ATA System: 5311 5312 5321 5211

SUBJECT: FUSELAGE - Main Frame - Inspections Based on Fatigue Test Results

BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET

Copyright © 2004 The Boeing Company

Unpublished Work - All Rights Reserved

Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable 

subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.

This document includes proprietary information owned by The Boeing Company and/or one or more third 

parties. Treatment of the document and the information it contains is governed by contract with Boeing. For 

more information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124.

Boeing, 707, 717, 727, 737, 747, 757, 767, 777, BBJ, BOEING BUSINESS JET, DC-8, DC-9, DC-10, MD-10, 

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 Table of Contents

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Table of Contents

Revision Transmittal Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . 32

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . 32

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . 32

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . 33

3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . 33

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

FIGURE 1: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 1, 5, 6, AND 7

AIRPLANES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

FIGURE 2: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 1, 5, 6, AND 7

AIRPLANES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES . . . . . . . . . . . . 57

FIGURE 4: INSPECTION OF AREA 4 - SECTION 42 LOWER LOBE FRAMES . . . . . . . . . . . . 68

FIGURE 5: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 1 AND 5

AIRPLANES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

FIGURE 6: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 1, 3, 5, 6, 7, and 8

AIRPLANES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE
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WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400 . . . . . . . . . . 90

FIGURE 8: INSPECTION OF AREA 8 - MAIN ENTRY DOORS - GROUP 1, 3, 5, 6, 7, 8, AND 10

AIRPLANES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

FIGURE 9: INSPECTION OF AREA 9 - MAIN ELECTRONICS BAY ACCESS DOOR CUTOUT . . . 103

FIGURE 10: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 2 AND 9 AIRPLANES

105

FIGURE 11: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 3 AND 10 AIRPLANES

110

FIGURE 12: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 4 AIRPLANES . 115

FIGURE 13: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 2, 3, 4, 9, AND

10 AIRPLANES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

FIGURE 14: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 2 and 4 AIRPLANES

125

FIGURE 15: INSPECTION OF AREA 8 - MAIN ENTRY DOORS - GROUP 2, 4, AND 9 AIRPLANES 130

FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9

AIRPLANES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

FIGURE 17: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 3, 6, 7, AND 10

AIRPLANES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

FIGURE 18: INSPECTION OF AREA 1 - FRAME INSPECTION COMMON TO UPPER DECK FLOOR

BEAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

FIGURE 19: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 9 AIRPLANES 157

FIGURE 20: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 10 AIRPLANES 161

FIGURE 21: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 8 AIRPLANES . 168

APPENDIX A: LOGIC DIAGRAM - GROUP 1 AND 6 AIRPLANES . . . . . . . . . . . . . . . . . . 172

APPENDIX B: LOGIC DIAGRAM - GROUP 2, 3, 4, 5, 7, 9, AND 10 AIRPLANES. . . . . . . . . . . 173
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ALERT ALERT

Commercial

Airplane

Group 747

ALERT ALERT

Service Bulletin

Number: 747-53A2500 Revision Transmittal Sheet

Date: December 21, 2004

Revision 1: September 25, 2008

ATA System: 5311 5312 5321 5211

SUBJECT: FUSELAGE - Main Frame - Inspections Based on Fatigue Test Results

This Revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION

More work is necessary on airplanes inspected as given in the original issue of this service bulletin. Operators 

should incorporate the additional inspection requirements for Area 1 and Area 6 during the next scheduled 

inspection.

No airplanes have been added to the service bulletin effectivity. However, 747 Large Cargo Freighter (LCF) 

airplanes RT631-RT632, RT743, and RT876 were moved from Group 1 to new Group 8. 747-200F airplanes 

through line number 685 were moved from Group 2 to new Group 9. 747-200C airplanes through line number 

685 were moved from Group 3 to new Group 10.

Federal Aviation Administration (FAA) Airworthiness Directives 2006-05-02 and 2004-07-22 R1 are related to 

this service bulletin.

REASON FOR REVISION

This revision is sent to add new inspection requirements for Area 1, and to add to and to clarify some inspection 

requirements for Area 6. Inspection Area 1 (upper deck floor beams) has been changed to include inspections 

of the fuselage frames in the areas where the upper deck floor beams are attached. Inspection Area 6 has been 

changed to include inspection of more fuselage frames in the area above Main Entry Door 1 on 747-200C and 

747-200F airplanes after line number 685, and on all 747-400, 747-400D, and 747-400F airplanes. For 747-

200C and 747-200F airplanes through line number 685, this inspection area is included in Boeing Service 

Bulletin 747-53A2732.

In addition, Compliance information and inspection area requirements for 747 Large cargo Freighter (LCF) 

airplanes have been added.

These sections were changed:

1. In Summary Background section and in Reason, Paragraph 1.C., referenced Boeing Service Related 

Problem (SRP) 747-SRP-53-0311. Also, updated Summary illustration.

2. In Description Paragraph 1.D., a description of the inspections required on Group 8 airplanes has been 

added.
 

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3. In Compliance, Paragraph 1.E., Compliance information for new Group 8 airplanes has been added. 

Related airworthiness directives have also been added.

4. In Approval, Paragraph 1.F., the approval statement has been updated and Alternative Method of 

Compliance information for related airworthiness directives has been added.

5. In Manpower, Paragraph 1.G., the estimate has been updated to include inspection of the frames in the 

upper deck floor beam attachment areas in Area 1.

6. In References, Paragraph 1.J., updated references list.

7. In Work Instructions, Paragraph 3.B., descriptions of the inspections required in the various Inspection 

Areas for Group 8 airplanes have been added.

8. In Work Instructions, Paragraph 3.B., Area 1 inspection, instructions were added for detailed inspection of 

the frame inner chord, the frame outer chord, and the frame web in the area between the upper and lower 

chords of the upper deck floor beams. Instructions were added to inspect Group 8 airplanes as given in 

Figure 21.

9. In Work Instructions, Paragraph 3.B., Area 5 inspection, step 5 has been revised to refer to Figure 17 (was 

Figure 19).

10. In Work Instructions, Paragraph 3.B., Area 6 inspection, instructions were added to inspect Group 9 

airplanes as given in Figure 19. Instructions were added to inspect Group 10 airplanes as given in Figure 

20.

11. Figures 6 and 14 (for Area 6) have been revised to clarify and add inspection requirements for the area 

above the Main Entry Door No. 1 cutout. On these airplanes, also do detailed inspections of the body 

frames at STA 400 through STA 500, from the top of the upper deck floor to Stringer 8.

12. Figure 18 (for Area 1) has been added for detailed inspection of the frame inner chord, the frame outer 

chord, and the frame web in the area between the upper and lower chords of the upper deck floor beams. 

This inspection is necessary on both sides of the airplane at each frame from body station 260 to body 

station 520.

13. Figure 19 (for Area 6 on Group 9 airplanes) has been added to show that on these airplanes it is not 

necessary to do inspections of the frames above the upper deck floor above Main Entry Door 1 left.

14. Figure 20 (for Area 6 on Group 10 airplanes) has been added to show that on these airplanes it is not 

necessary to do inspections of the frames above the upper deck floor above Main Entry Door 1 left and 

right.

15. Figure 21 (for Area 1 on Group 8 airplanes) has been added to show the detailed inspection requirements 

for the upper deck floor beams on Group 8 airplanes.

Paragraph 1.A., Effectivity, shows changes of airplane operators. Each operator should examine the Effectivity 

paragraph for changes.

Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location 

of important changes.

Pages with no vertical lines have no important changes.
 

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REVISION HISTORY

Original Issue: December 21, 2004

Revision 1: September 25, 2008
 

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December 21, 2004

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ALERT ALERT

Commercial

Airplane

Group 747

ALERT ALERT

Service Bulletin

Number: 747-53A2500 Summary

Date: December 21, 2004

Revision 1: September 25, 2008

ATA System: 5311 5312 5321 5211

SUBJECT: FUSELAGE - Main Frame - Inspections Based on Fatigue Test Results

THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN 

PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE 

BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE 

BULLETIN TO THE NEW OWNER.

CONCURRENT REQUIREMENTS

None.

BACKGROUND

This service bulletin gives data for the inspection and repair, if necessary, of certain fuselage structure. These 

inspections and repairs are necessary for safe operation of 747-400 airplanes and nose cargo door 747 

airplanes past the design life goal. Tests by Boeing have determined that the structure shown in this service 

bulletin is subject to fatigue cracks. 

Boeing has completed extended pressure fatigue tests on a 747SR and a 747-400 fuselage test article. Boeing 

has also used updated analysis methods on the 747 fuselage structure. The tests and analysis have identified 

areas of the fuselage where fatigue cracks can occur. Inspection and repair of these areas is necessary for safe 

operation of 747 airplanes past the design life goal.

The inspections in this service bulletin will make sure that fatigue cracks in the areas of fuselage internal 

structure shown do not become critical.

Additional service bulletins will be required to be accomplished in certain specific areas, as a result of fatigue 

crack findings in the 747 fleet. Also, Supplemental Structural Inspection Document (SSID), D6-35022 Revision 

G and Federal Aviation Administration (FAA) Airworthiness Directive 2004-07-22 R1 require inspections to be 

accomplished, starting at 20,000 total flight-cycles. 

Boeing Service Related Problem (SRP) 747-SRP-53-0211 is related to this service bulletin.

Boeing Service Related Problem (SRP) 747-SRP-53-0311 is related to this service bulletin.

ACTION (PRR 85901-44RS)

Do internal detailed inspections for cracks in these areas of internal fuselage structure:
 

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1. Upper deck floor beams.

2. Section 42 frames.

3. Section 46 frames.

4. Nose wheel well bulkheads, sidewall panels, and the STA 360 and 380 main deck floor beams.

5. Section 41 frame structure in the area between the upper deck floor beam chords, from STA 260 to 520.

Do internal and external detailed inspections of the main entry doors and door cutouts for cracks.

Do internal and external detailed inspections of the fuselage skin for cracks at all four corners of the main 

electronics bay access door cutout.

If cracks are found, refer to the structural repair manual for repair instructions. If the damage is beyond the limits 

shown in the structural repair manual, ask Boeing for repair data. Also, ask Boeing for repair data if an 

applicable repair is not included in the structural repair manual.

EFFECTIVITY

All 747-200C, 747-200F, 747-400, 747-400D, and 747-400F series airplanes. Refer to Paragraph 1.A.1., 

Airplanes for the list of affected airplanes.

COMPLIANCE

The Federal Aviation Administration (FAA) will possibly release another Airworthiness Directive related to this 

service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service 

bulletin mandatory.

Federal Aviation Administration (FAA) Airworthiness Directives 2006-05-02 and 2004-07-22 R1 are related to 

this service bulletin.

Refer to Paragraph 1.E., Compliance.

INDUSTRY SUPPORT INFORMATION

Boeing warranty remedies are not available for the inspection or repair procedures given in this service bulletin.

MANPOWER

MATERIAL INFORMATION

None.

Airplanes Total Task Hours Elapsed Hours

All 1990 322
 

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FRAMES

LOWER LOBE

SECTION 42

INSPECT THE

1000

STA

520

STA

260 BULKHEAD

140

STA

INSPECT THE

BODY STATION

INSPECT THE BODY

WHEEL WELL STRUCTURE

BULKHEADS AND NOSE

STATION 340 AND 400

ENTRY DOORS AND

DOOR CUTOUTS

INSPECT THE MAIN

INSPECT THE UPPER DECK FLOOR

BEAMS AND INSPECT THE FRAMES IN

THE AREA COMMON TO THE UPPER

DECK FLOOR BEAMS 520

STA

UPPER DECK

FLOOR BEAMS

INSPECT THE

INSPECT THE

UPPER LOBE

FRAMES

SECTION 42

ACCESS DOOR CUTOUT

ELECTRONICS BAY

AT THE MAIN

INSPECT THE SKIN

DECK FLOOR BEAMS

360 AND 380 MAIN

INSPECT THE STA

DOORS AND DOOR

INSPECT THE

MAIN ENTRY

CUTOUTS

DOORS AND DOOR

CUTOUTS

MAIN ENTRY

INSPECT THE

1000

STA

1480

STA

1480

STA

2360

STA

DOORS AND DOOR

SECTION 46

SECTION 46

FRAMES

LOWER LOBE

CUTOUTS

MAIN ENTRY

INSPECT THE

UPPER LOBE

FRAMES

INSPECT THE

INSPECT THE

DECK FLOOR BEAMS

INSPECT THE UPPER

RIGHT SIDE OPPOSITE

LEFT SIDE SHOWN

SECTION 42

RIGHT SIDE OPPOSITE

LEFT SIDE SHOWN

SECTION 41

RIGHT SIDE OPPOSITE

LEFT SIDE SHOWN

SECTION 46

RIGHT SIDE OPPOSITE

LEFT SIDE SHOWN

SECTION 44

FWD

FWD

FWD

FWD

W59427
 

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December 21, 2004

Revision 1: September 25, 2008 747-53A2500

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 13 of 173

ALERT ALERT

Commercial

Airplane

Group 747

ALERT ALERT

Service Bulletin

Number: 747-53A2500

Date: December 21, 2004

Revision 1: September 25, 2008

ATA System: 5311 5312 5321 5211

SUBJECT: FUSELAGE - Main Frame - Inspections Based on Fatigue Test Results

THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN 

PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE 

BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE 

BULLETIN TO THE NEW OWNER.

1. PLANNING INFORMATION

A. Effectivity

1. Airplanes

Refer to Service Bulletin Index Document D6-30300 Part 3 for Airplane Variable Number, Line 

Number, and Serial Number data.

This service bulletin is for the airplanes shown below. Refer to PRR 85901-44RS for data about 

this change.

NOTE: This service bulletin is for the airplanes identified below. The effectivity list shown below

is complete for airplanes through line number 1413. However, airplanes after line

number 1413 are also affected by this service bulletin.

GROUP CONFIGURATION DESCRIPTION

1 - All 747-400 airplanes line number 758 and on, 

except Combi and 747-400F airplanes and 

airplanes modified by Boeing to the Large 

Cargo Freighter (LCF) configuration.

2 - All 747-200F airplanes line number 686 and on.

3 - All 747-200C airplanes line number 686 and on.

4 - All 747-400F airplanes.

5 - All 747-400 airplanes through line number 757, 

except Combi and 747-400F airplanes.
 

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Airplane models:

747-200C 747-200F 747-400 747-400D

747-400F

IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER

AEROLINEAS ARGENTINAS (ARG)

1 RT701–RT702 RT704

AIR ATLANTA ICELANDIC (AID)

1 RT515 RT751

2 RR206

9 RR204 RR332

AIR CHINA (BEJ)

1 RM341 RT878–RT880

2 RR451

6 RM811–RM813 RT032–RT035

7 RT031

AIR CHINA CARGO (CGC)

4 RL501–RL502

6 RT101 RT103

AIR FRANCE (AFA)

1 RM401–RM403 RT711–RT716

2 RR308–RR309

4 RL671–RL675

5 RT591

6 RT071–RT075 RT121

9 RR306

AIR INDIA (AIN)

1 RT749 RU001–RU006

6 - All 747-400 Combi airplanes line number 758 

and on.

7 - All 747-400 Combi airplanes through line 

number 757.

8 - All 747-400 airplanes line number 758 and on, 

modified by Boeing to the Large Cargo Freighter 

(LCF) configuration.

9 - All 747-200F airplanes through line number 685.

10 - All 747-200C airplanes through line number 

685.

GROUP CONFIGURATION DESCRIPTION
 

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AIR NEW ZEALAND (ANZ)

1 RM082 RM191–RM192 RT672–RT673 RT703

RT932

5 RT671

AIR PACIFIC (APC)

5 RT502 RT504

AIR PULLMANTUR (PUL)

1 RT525

AIRBRIDGE CARGO (ABM)

2 RR556

4 RL576–RL577 RL579

9 RR552

ALL NIPPON AIRWAYS (ANA)

1 RM231 RM233 RT753–RT756 RT776–RT777

RU831–RU841

AMIRI FLIGHT (ABD)

1 RM084

6 RT137

ASIANA AIRLINES (AAR)

1 RM071 RU032

4 RM861–RM863 RR746–RR747

6 RT131–RT136

ATLAS AIR (TLS)

1 RT752

10 RJ333

4 RM891–RM899 RM901–RM906 RR748

9 RR301

AVION AIRCRAFT TRADING H.F. (VNG)

1 RT633–RT634

AWAS (AWW)

10 RJ321

3 RJ322

BAHRAIN ROYAL FLIGHT (BHR)

1 RM426

BOEING (TBC)

9 RR222–RR223

BOEING AIRCRAFT HOLDING CO. (BHC)

10 RJ132
 

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BRITISH AIRWAYS (BAB)

1 RM096–RM097 RM136–RM145 RM261–RM264 RT476–RT499

RU121–RU132

5 RT471–RT475

C.A.L. CARGO AIR LINES (CRG)

10 RJ331–RJ332

CARGO 360, INC. (CGN)

2 RR024–RR025

CARGO B AIRLINES (CBO)

2 RR307

9 RR561

CARGOLUX AIRLINES (CLX)

4 RL551 RM881–RM890 RR701 RR721–RR724

CATHAY PACIFIC AIRWAYS (CAT)

1 RT453–RT469 RT508 RT511–RT512 RT514

RT517–RT518 RT522 RT528–RT529 RT781–RT782

2 RR441–RR442

4 RL581–RL583 RM856–RM859 RR951–RR952

5 RT451–RT452

CHINA AIRLINES (CHI)

1 RM021–RM024 RM441–RM443 RM445 RT636–RT640

4 RL411–RL430 RL481

CHINA CARGO (CIQ)

4 RL521–RL522

CHINA SOUTHERN AIRLINES (GUN)

4 RL751–RL752

CORSAIR (COR)

1 RT613–RT614 RT616 RT618–RT619 RT621

DRAGONAIR (DRG)

1 RT510 RT513 RT516 RT524

2 RR522

DUBAI AIR WING (DAW)

1 RM167–RM168

6 RT102

EL AL ISRAEL AIRLINES (ELA)

1 RM091 RU081–RU083

10 RJ152

9 RR225–RR226

EMIRATES (EAD)

4 RL533–RL534
 

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EVA AIR (EVA)

1 RM116–RM117 RT951–RT952 RT955

4 RL401–RL403

6 RT162–RT163 RT165–RT168 RT953–RT954

EVERGREEN INTERNATIONAL A/L (EVR)

10 RJ131 RJ133

8 RT631–RT632 RT743 RT876

EXPORT RESTRICTED AIRPLANES (YWV)

1 RT412 RT606 RT615 RT620

RT622

5 RT602

9 RR001–RR004

GARUDA INDONESIA (GIA)

1 RT931 RU061–RU062

GENERIC CUSTOMER/SUPPLIER (XXX)

2 RR310

9 RR202–RR203

GOVERNMENT OF JAPAN (JAG)

1 RT681–RT682

GRAND STAR (GCG)

4 RR861

GREAT WALL AIRLINES (GWL)

1 RT520

IRAQI AIRWAYS (IRQ)

10 RJ301–RJ303

JADE CARGO INTERNATIONAL (JDE)

4 RL511–RL516

JAL INTERNATIONAL (JAL)

1 RM126–RM132 RM316–RM318 RT641–RT657 RT861–RT864

RT966–RT967 RU801–RU809

4 RL461–RL462

9 RR265–RR266

KALITTA AIR (KAC)

7 RT021–RT022

9 RR261–RR262 RR361–RR362 RR501 RR521

KINGDOM HOLDING COMPANY (KBA)

1 RT877
 

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KLM - ROYAL DUTCH AIRLINES (KLM)

1 RT533–RT535

4 RL681–RL684

5 RT531–RT532

6 RM801–RM803 RT003–RT014

7 RT001–RT002

KOREAN AIR (KAL)

1 RM011–RM013 RT574–RT588 RT590 RT811–RT814

4 RL451–RL456 RM871–RM880 RR862

5 RT571–RT573

6 RT061

KUWAIT AIRWAYS (KUW)

6 RT151

LUFTHANSA GERMAN AIRLINES (DLH)

1 RM001–RM007 RT434–RT439 RT441–RT447

5 RT431–RT433

6 RT044–RT047

7 RT041–RT043

MALAYSIA AIRLINES (MAS)

1 RM036–RM040 RM366–RM367 RT744 RT746

RT748 RT750 RU016–RU017

4 RL491–RL492

MARTINAIR HOLLAND (MTH)

1 RT506–RT507 RT509

5 RT501

MK AIRLINES (MKA)

9 RR022–RR023 RR224 RR336 RR421

NIPPON CARGO AIRLINES (NCA)

2 RR555

4 RL471–RL479

9 RR553

NORTHWEST AIRLINES (NWA)

1 RM241–RM246 RT407–RT410

2 RR566

5 RT401–RT406

9 RR005 RR341–RR342 RR344–RR345 RR431–RR432

RR503

OASIS HONG KONG AIRLINES (OHK)

1 RM232 RT505

5 RT503

OMAN ROYAL FLIGHT (RFO)

1 RM010
 

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ORIENT THAI AIRLINES (OTH)

9 RR264

PHILIPPINE AIRLINES (PAL)

1 RU059

6 RT152

POLAR AIR CARGO (PAO)

4 RL651–RL655

9 RR504

PRONAIR (TXI)

9 RR221

QANTAS (QAN)

1 RF001–RF006 RM331–RM333 RT554–RT568 RT741–RT742

RU031

5 RT551–RT553

ROYAL AIR MAROC (RAM)

1 RT717

SAUDI ARABIAN AIRLINES (SVA)

1 RM156–RM157 RU101–RU102

2 RR526

SAUDI ROYAL FLIGHT (SRF)

1 RM158

SIACARGO (SIT)

4 RL431–RL436 RM851–RM855 RR851–RR856

SINGAPORE AIRLINES (SIA)

1 RM041–RM045 RT519 RT521 RT523

RT526–RT527 RT530 RT747 RT831–RT835

RT837

SOUTH AFRICAN AIRWAYS (SAA)

1 RM081 RM083 RM146–RM147 RT784

SOUTHERN AIR (SOF)

2 RR554

9 RR267 RR302–RR305 RR551

THAI AIRWAYS INTERNATIONAL (TII)

1 RM026–RM030 RM431 RT691–RT699 RT801–RT803

THE SULTAN'S FLIGHT (BWN)

1 RT440

TNT AIRWAYS (TNB)

4 RL531–RL532
 

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TRANSAERO AIRLINES (TRX)

1 RT783

UNITED AIR LINES (UAL)

1 RM166 RM169–RM177 RT411 RT603–RT605

RT607–RT612 RT617 RT623–RT630

5 RT601

UPS (UPS)

4 RL561–RL568

6 RT161 RT164

US AIR FORCE (USF)

4 RM911

VIRGIN ATLANTIC AIRWAYS (VAA)

1 RM051–RM053 RM351–RM355 RT945–RT949

WILMINGTON TRUST COMPANY (WBT)

1 RU051–RU052 RU060

WORLD AIRWAYS, INC. (WLD)

1 RT745

YANGTZE RIVER EXPRESS (YTH)

1 RT757

IDENTIFICATION BY VARIABLE NUMBER

Variable Group

RF001–RF006 1

RJ131–RJ133 10

RJ151–RJ152 10

RJ301–RJ303 10

RJ321 10

RJ322 3

RJ331–RJ333 10

RL401–RL403 4

RL411–RL436 4

RL451–RL456 4

RL461–RL462 4

RL471–RL479 4

RL481 4

RL491–RL492 4

RL501–RL502 4

RL511–RL516 4

RL521–RL522 4
 

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RL531–RL534 4

RL551 4

RL561–RL568 4

RL576–RL577 4

RL579 4

RL581–RL583 4

RL651–RL655 4

RL671–RL675 4

RL681–RL684 4

RL751–RL752 4

RM001–RM007 1

RM010–RM013 1

RM021–RM024 1

RM026–RM030 1

RM036–RM045 1

RM051–RM053 1

RM071 1

RM081–RM084 1

RM091 1

RM096–RM097 1

RM116–RM117 1

RM126–RM132 1

RM136–RM147 1

RM156–RM158 1

RM166–RM177 1

RM191–RM192 1

RM231–RM233 1

RM241–RM246 1

RM261–RM264 1

RM316–RM318 1

RM331–RM333 1

RM341 1

RM351–RM355 1

RM366–RM367 1

RM401–RM403 1

RM426 1

RM431 1

RM441–RM443 1

RM445 1

Variable Group
 

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RM801–RM803 6

RM811–RM813 6

RM851–RM859 4

RM861–RM863 4

RM871–RM899 4

RM901–RM906 4

RM911 4

RR001–RR005 9

RR021–RR023 9

RR024–RR025 2

RR031 9

RR201–RR205 9

RR206 2

RR221–RR226 9

RR261–RR267 9

RR301–RR306 9

RR307–RR310 2

RR331–RR332 9

RR336 9

RR341–RR345 9

RR361–RR362 9

RR421–RR422 9

RR431–RR432 9

RR441–RR442 2

RR451 2

RR501–RR504 9

RR521 9

RR522 2

RR526 2

RR531 9

RR551–RR553 9

RR554–RR556 2

RR561 9

RR566 2

RR701 4

RR721–RR724 4

RR746–RR748 4

RR851–RR856 4

RR861–RR862 4

Variable Group
 

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RR951–RR952 4

RT001–RT002 7

RT003–RT014 6

RT021–RT022 7

RT031 7

RT032–RT035 6

RT041–RT043 7

RT044–RT047 6

RT061 6

RT071–RT075 6

RT101–RT103 6

RT121 6

RT131–RT137 6

RT151–RT152 6

RT161–RT168 6

RT401–RT406 5

RT407–RT412 1

RT431–RT433 5

RT434–RT447 1

RT451–RT452 5

RT453–RT469 1

RT471–RT475 5

RT476–RT499 1

RT501–RT504 5

RT505–RT530 1

RT531–RT532 5

RT533–RT535 1

RT551–RT553 5

RT554–RT568 1

RT571–RT573 5

RT574–RT590 1

RT591 5

RT601–RT602 5

RT603–RT630 1

RT631–RT632 8

RT633–RT657 1

RT671 5

RT672–RT673 1

RT681–RT682 1

Variable Group
 

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2. Spares Affected

None.

B. Concurrent Requirements

None.

RT691–RT699 1

RT701–RT704 1

RT711–RT717 1

RT741–RT742 1

RT743 8

RT744–RT757 1

RT776–RT777 1

RT781–RT784 1

RT801–RT803 1

RT811–RT814 1

RT831–RT837 1

RT861–RT864 1

RT876 8

RT877–RT880 1

RT931–RT932 1

RT945–RT949 1

RT951–RT952 1

RT953–RT954 6

RT955 1

RT966–RT967 1

RU001–RU006 1

RU016–RU017 1

RU031–RU032 1

RU051–RU052 1

RU059–RU062 1

RU081–RU083 1

RU101–RU102 1

RU121–RU132 1

RU801–RU809 1

RU831–RU841 1

Variable Group
 

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C. Reason

This service bulletin gives data for the inspection and repair, if necessary, of certain fuselage 

structure. These inspections and repairs are necessary for safe operation of 747-400 airplanes and 

nose cargo door 747 airplanes past the design life goal. Tests by Boeing have determined that the 

structure shown in this service bulletin is subject to fatigue cracks. 

Boeing has completed extended pressure fatigue tests on a 747SR and a 747-400 fuselage test 

article. Boeing has also used updated analysis methods on the 747 fuselage structure. The tests and 

analysis have identified areas of the fuselage where fatigue cracks can occur. Inspection and repair 

of these areas is necessary for safe operation of 747 airplanes past the design life goal.

The inspections in this service bulletin will make sure that fatigue cracks in the areas of fuselage 

internal structure shown do not become critical.

Additional service bulletins will be required to be accomplished in certain specific areas, as a result of 

fatigue crack findings in the 747 fleet. Also, Supplemental Structural Inspection Document (SSID), 

D6-35022 Revision G and Federal Aviation Administration (FAA) Airworthiness Directive 2004-07-22 

R1 require inspections to be accomplished, starting at 20,000 total flight-cycles.

Boeing Service Related Problem (SRP) 747-SRP-53-0211 is related to this service bulletin.

Boeing Service Related Problem (SRP) 747-SRP-53-0311 is related to this service bulletin.

Revision 1 is sent to add new inspection requirements for Area 1, and to add to and to clarify some 

inspection requirements for Area 6. Inspection Area 1 (upper deck floor beams) has been changed 

to include inspections of the fuselage frames in the areas where the upper deck floor beams are 

attached. Inspection Area 6 has been changed to include inspection of more fuselage frames in the 

area above Main Entry Door 1 on 747-200C and 747-200F airplanes after line number 685, and on all 

747-400, 747-400D, and 747-400F airplanes. For 747-200C and 747-200F airplanes through line 

number 685, this inspection area is included in Boeing Service Bulletin 747-53A2732.

In addition, Compliance information and inspection area requirements for 747 Large cargo Freighter 

(LCF) airplanes have been added.

These sections were changed as part of Revision 1:

1. In Summary Background section and in Reason, Paragraph 1.C., referenced Boeing Service 

Related Problem (SRP) 747-SRP-53-0311. Also, updated Summary illustration.

2. In Description Paragraph 1.D., a description of the inspections required on Group 8 airplanes has 

been added.

3. In Compliance, Paragraph 1.E., Compliance information for new Group 8 airplanes has been 

added. Related airworthiness directives have also been added.

4. In Approval, Paragraph 1.F., the approval statement has been updated and Alternative Method 

of Compliance information for related airworthiness directives has been added.

5. In Manpower, Paragraph 1.G., the estimate has been updated to include inspection of the frames 

in the upper deck floor beam attachment areas in Area 1.

6. In References, Paragraph 1.J., updated references list.
 

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7. In Work Instructions, Paragraph 3.B., descriptions of the inspections required in the various 

Inspection Areas for Group 8 airplanes have been added.

8. In Work Instructions, Paragraph 3.B., Area 1 inspection, instructions were added for detailed 

inspection of the frame inner chord, the frame outer chord, and the frame web in the area 

between the upper and lower chords of the upper deck floor beams. Instructions were added to 

inspect Group 8 airplanes as given in Figure 21.

9. In Work Instructions, Paragraph 3.B., Area 5 inspection, step 5 has been revised to refer to Figure 

17 (was Figure 19).

10. In Work Instructions, Paragraph 3.B., Area 6 inspection, instructions were added to inspect 

Group 9 airplanes as given in Figure 19. Instructions were added to inspect Group 10 airplanes 

as given in Figure 20.

11. Figures 6 and 14 (for Area 6) have been revised to clarify and add inspection requirements for 

the area above the Main Entry Door No. 1 cutout. On these airplanes, also do detailed 

inspections of the body frames at STA 400 through STA 500, from the top of the upper deck floor 

to Stringer 8.

12. Figure 18 (for Area 1) has been added for detailed inspection of the frame inner chord, the frame 

outer chord, and the frame web in the area between the upper and lower chords of the upper 

deck floor beams. This inspection is necessary on both sides of the airplane at each frame from 

body station 260 to body station 520.

13. Figure 19 (for Area 6 on Group 9 airplanes) has been added to show that on these airplanes it is 

not necessary to do inspections of the frames above the upper deck floor above Main Entry Door 

1 left.

14. Figure 20 (for Area 6 on Group 10 airplanes) has been added to show that on these airplanes it 

is not necessary to do inspections of the frames above the upper deck floor above Main Entry 

Door 1 left and right.

15. Figure 21 (for Area 1 on Group 8 airplanes) has been added to show the detailed inspection 

requirements for the upper deck floor beams on Group 8 airplanes.

D. Description

Group 1-7, 9-10: 

1. Do internal detailed inspections for cracks in these areas of internal fuselage structure:

a. Upper deck floor beams.

b. Section 42 frames.

c. Section 46 frames.

d. Nose wheel well bulkheads, sidewall panels, and the STA 360 and 380 main deck floor 

beams.

e. Section 41 frame structure in the area between the upper deck floor beam chords, from STA 

260 to 520.
 

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2. Do internal and external detailed inspections of the main entry doors and door cutouts for cracks.

3. Do internal and external detailed inspections of the fuselage skin for cracks at all four corners of 

the main electronics bay access door cutout.

Group 8: 

1. Do internal detailed inspections for cracks in these areas of internal fuselage structure:

a. Upper deck floor beams.

b. Section 42 lower lobe frames.

c. Section 46 lower lobe frames.

d. Nose wheel well bulkheads, sidewall panels, and the STA 360 and 380 main deck floor 

beams.

e. Section 41 frame structure in the area between the upper deck floor beam chords, from STA 

260 to 520.

2. Do internal and external detailed inspections of Main Entry Door 1 left and right and the Main 

Entry Door 1 cutouts for cracks.

3. Do internal and external detailed inspections of the fuselage skin for cracks at all four corners of 

the main electronics bay access door cutout.

If cracks are found, refer to the structural repair manual for repair instructions. If the damage is beyond 

the limits shown in the structural repair manual, ask Boeing for repair data. Also, ask Boeing for repair 

data if an applicable repair is not included in the structural repair manual.

The airplane effectivity is divided in ten groups.

Revision 1 - More work is necessary on airplanes inspected as given in the original issue of this 

service bulletin. Operators should incorporate the additional inspection requirements for Area 1 and 

Area 6 during the next scheduled inspection.

E. Compliance

The Federal Aviation Administration (FAA) will possibly release another Airworthiness Directive 

related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times 

given in this service bulletin mandatory.
 

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On Groups 1 - 7 and 9 - 10 airplanes, for inspections that were added to this service bulletin in 

Revision 1 (i.e., in Areas 1 and 6), start the new inspections at 22,000 total flight-cycles or within 1,000 

flight-cycles after the date on Revision 1 of this service bulletin, whichever is later. On Groups 1 - 7 

and 9 - 10 airplanes, these inspections include the frame inspections in Figure 18 from body station 

260 to 520, between the upper and lower chords of the upper deck floor beams. On Groups 1 - 7 

airplanes, these inspections also include the frame inspections in Figures 6 and 14 from body station 

400 to 500, from the upper chord of the upper deck floor beams to Stringer 8. For all the existing 

inspections, refer to TABLE 1 for compliance times.

NOTE: On Group 8 airplanes, this service bulletin does not include Area 2 and Area 5 inspections.

Federal Aviation Administration (FAA) Airworthiness Directives 2006-05-02 and 2004-07-22 R1 are 

related to this service bulletin.

Group 1-7, 9-10: TABLE 1:

Group Area Action Compliance Time (Whichever is later) Repeat Interval

1 and 6 1, 3, 4, 6, 7, 

8, and 9

Inspect 22,000 total 

flight-cycles

1,000 flight-cycles after 

the date on the original 

issue of this service 

bulletin.

3,000 flight-cycles

2 and 5 Inspect 25,000 total 

flight-cycles

1,000 flight-cycles after 

the date on the original 

issue of this service 

bulletin.

3,000 flight-cycles

2, 3, 4, 

5, 7, 9, 

and 10

1, 2, 3, 4, 6, 

7, 8, and 9

Inspect 22,000 total 

flight-cycles

1,000 flight-cycles after 

the date on the original 

issue of this service 

bulletin.

3,000 flight-cycles

5 Inspect 25,000 total 

flight-cycles

1,000 flight-cycles after 

the date on the original 

issue of this service 

bulletin.

3,000 flight-cycles

Group 8: TABLE 2:

Condition Action

Compliance Time (Whichever 

occurs later)

Repeat Interval 

(Not to Exceed)

All Group 8 

airplanes

Inspect Area 1 as given in 

Paragraph 3.B.

20,000 total 

flight-cycles

1,000 flight-cycles after 

the date on Revision 1 

of this service bulletin.

2,500 flight-cycles

All Group 8 

airplanes

Inspect Area 3, Area 4, 

and Area 8 as given in 

Paragraph 3.B.

22,000 total 

flight-cycles

1,000 flight-cycles after 

the date on Revision 1 

of this service bulletin.

3,000 flight-cycles

All Group 8 

airplanes

Inspect Area 6 and Area 9 

as given in Paragraph 3.B.

15,000 total 

flight-cycles

1,000 flight-cycles after 

the date on Revision 1 

of this service bulletin.

1,500 flight-cycles

All Group 8 

airplanes

Inspect Area 7 as given in 

Paragraph 3.B.

18,000 total 

flight-cycles

1,000 flight-cycles after 

the date on Revision 1 

of this service bulletin.

2,500 flight-cycles
 

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F. Approval

This service bulletin was examined by the Federal Aviation Administration (FAA). The changes 

specified in this service bulletin comply with the applicable regulations and are FAA approved, as well 

as European Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/

JAA approved airplanes listed in the service bulletin effectivity. This service bulletin and its approval 

were based on the airplane in its original Boeing delivery configuration or as modified by other 

approved Boeing changes.

If an airplane has a non-Boeing modification or repair that affects a component or system also affected 

by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency 

approval before incorporating this service bulletin.

This service bulletin has been approved by the FAA. In addition, the Manager of the FAA Seattle 

Aircraft Certification Office approves the accomplishment of the applicable inspection and repair 

procedures of this service bulletin as an AMOC to the corresponding inspection and repair 

requirements of paragraph (f) of AD 2006-05-02. This AMOC only applies to the areas inspected as 

given in this service bulletin. When this service bulletin specifies contacting Boeing for repair 

instructions, the repair instructions must be in accordance with FAA-approved procedures as required 

by paragraph (g) of the AD. All provisions of AD 2006-05-02 that are not specifically referenced in the 

preceding statement remain fully applicable and must be complied with.

The Manager of the FAA Seattle ACO also approves the accomplishment of the applicable inspection 

and repair procedures of this service bulletin as an AMOC to the corresponding inspection and repair 

requirements of paragraphs (h), (i), and (j) of FAA AD 2004-07-22 R1 for SSI F-21A, F-21B, F-24A, 

F-24C, F-41A, and F-41B of Supplemental Structural Inspection Document (SSID) D6-35022, 

Revision G. This AMOC only applies to the areas inspected as given in this service bulletin. When 

this service bulletin specifies contacting Boeing for repair instructions, the repair instructions must be 

in accordance with FAA-approved procedures as required by paragraph (j) of the AD. All provisions 

of AD 2004-07-22 R1 that are not specifically referenced in the preceding statement, including the 

initial inspection threshold per paragraph (i) of AD 2004-07-22 R1, remain fully applicable and must 

be complied with.

G. Manpower

The table below shows an estimate of the task-hours necessary to do this inspection for each airplane. 

This estimate is for direct labor only, done by an experienced crew. Adjust the estimate with operator 

task-hour data if necessary. The estimate does not include lost time. These are some examples of 

lost time:

— Time to adjust to the workplace

— Time to schedule the work

— Time to examine the work

— Time to cure the materials

— Time to make the parts
 

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— Time to find the tools.

Group 1-7, 9-10: TABLE 1:

Area Task

Number of 

Persons Task-Hours Elapsed Hours

1 Open Access 8 120 15

Inspect Floor Beams 4 132 33

Inspect Frames at Upper 

Deck Floor Beams

26 3

Close Access 8 160 20

Test 3 18 6

TOTAL FOR AREA 1 436 77

2 Open Access 8 176 22

Examine 6 72 12

Close Access 8 240 30

Test 4 28 7

TOTAL FOR AREA 2 516 71

3 Open Access 8 96 12

Examine 4 16 4

Close Access 8 144 18

Test 4 20 5

TOTAL FOR AREA 3 276 39

4 Open Access 4 28 7

Examine 2 8 4

Close Access 4 40 10

Test 1 1 1

TOTAL FOR AREA 4 77 22

5 Open Access 6 66 11

Examine 2 8 4

Close Access 6 96 16

Test 2 8 4

TOTAL FOR AREA 5 178 35

6 Open Access 2 10 5

Examine 1 2 2

Close Access 2 14 7

Test 1 2 2

TOTAL FOR EACH DOOR 28 16

TOTAL FOR AREA 6 280 28
 

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NOTE: More time will be necessary for repairs if cracks are found.

H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

J. References

1. Existing Data:

a. Engineering Change Memo PRR85901-44RS

b. Service Related Problem (SRP) 747-SRP-53-0211

c. Service Related Problem (SRP) 747-SRP-53-0311

d. 747 Maintenance Manual (AMM) Subject 25-21-02, 25-21-03, 25-21-04, 25-22-01, 

25-22-03, 25-25-01, 25-28-01, 25-28-02, 25-52-01, 25-52-04, 25-53-15, 25-55-02, 

25-55-03, 25-59-01, 25-59-05, 52-11-02, 53-21-02

e. 747-400 Maintenance Manual (AMM) Subject 25-21-02, 25-21-03, 25-21-04, 25-22-01, 

25-22-03, 25-25-01, 25-28-01, 25-28-02, 25-52-01, 25-52-04, 25-53-15, 25-55-02, 

25-55-03, 25-59-01, 25-59-05, 52-11-02, 53-21-02

f. 747 Structural Repair Manual (SRM) Subject 52-00-03, 52-10-02, 53-00-01, 53-10-03, 53-

10-04, 53-10-04, 53-10-07, 53-30-03

7 Open Access 4 50 12.5

Examine 2 20 10

Close Access 4 62 15.5

Test 2 4 2

TOTAL FOR AREA 7 136 40

8 Open Access 1 3 3

Examine 1 1 1

Close Access 1 4 4

Test 1 1 1

TOTAL FOR EACH DOOR 9 9

TOTAL FOR AREA 8 90 9

9 Examine 1 1 1

TOTAL FOR AREA 9 1 1

TOTAL FOR EACH AIRPLANE 1990 322

Group 1-7, 9-10: TABLE 1:

Area Task

Number of 

Persons Task-Hours Elapsed Hours
 

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g. 747-400 Structural Repair Manual (SRM) Subject 52-10-01, 52-10-02, 53-00-01, 53-00-03, 

53-00-51, 53-10-07, 53-10-08, 53-10-51, 53-20-07, 53-20-51, 53-60-07, 53-60-15

h. 747-400F Structural Repair Manual (SRM) Subject 52-10-01, 52-10-02, 53-00-01, 53-00-

03, 53-10-07, 53-10-08, 53-20-07, 53-60-07, 53-60-15

i. Boeing Service Bulletins 747-53-2358, "Fuselage - Main Entry Doors Number 1, 2, 3, and 4 

- Forward Edge Stop Support Fitting Inspection and Replacement,"; 747-53A2396, 

"Fuselage - Skins - Skin and Internal Doubler Inspection, Repair, and Modification Above 

Main Entry Door 1 at Station 460,"; 747-53A2414, "Fuselage - Main Entry Door 1 Cutout - 

Door Frame Aft Edge at Station 488 - Inspection and Repair,"; 747-53A2416, "Fuselage - 

Center Section - Body Station 1265 Frame Inspection, Repair, and Modification,"’ 747-

53A2417, "Fuselage - Main Entry Door Number 1 Cutout - Door Frame Forward Edge at 

Station 434 - Inspection and Repair,"; 747-53A2450, "Fuselage - Section 46 - Body Station 

2231 Frame Inspection - Stringers 23 through 31"; 747-53A2451, "Fuselage - Section 42 - 

Door Number 2 Forward Edge Frame at Body Station 800 - Inspection and Repair"; and 

747-53A2512, Fuselage - Main Entry Door Number 3 Cutout - Lower Forward Corner and 

Upper Aft Corner - Inspection and Repair at Left and Right Side Skin and Bearstrap.

j. Boeing Service Letter 747-SL-53-088-A

k. 747 Supplemental Structural Inspection Document (SSID) D6-35022, Items F-21A, F-21B, 

F-24A, F-24B, F-24C, F-41A and F-41B

l. FAA Airworthiness Directives 2004-07-22 R1 and 2006-05-02

m. Boeing Parts Standards Document D-590

n. Boeing Drawing 012W6100

2. Data supplied with this Service Bulletin:

None.

3. Installation Drawings Used in the Preparation of this Service Bulletin:

None.

K. Publications Affected

None.

L. Interchangeability and Intermixability of Parts

Accomplishment of this service bulletin does not affect interchangeability or intermixability of parts.
 

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2. MATERIAL INFORMATION

A. Material - Price and Availability

None.

B. Industry Support Information

Boeing warranty remedies are not available for the inspections or repair procedures given in this 

service bulletin.

C. Parts Necessary For Each Airplane

1. Kits/Parts:

None.

2. Parts and Materials Supplied by the Operator:

None.

3. Parts Modified and Reidentified:

None.

4. Parts Removed and Not Replaced:

None.

D. Parts Necessary to Change Spares

None.

E. Special Tooling - Price and Availability

None.

F. Special Tooling Necessary to do this Service Bulletin

No special tools or equipment are necessary to do the change in this service bulletin, but maintenance 

and overhaul tools in the manuals given in Paragraph 1.J., References, may be necessary. Examine 

operator tool supply to make sure all necessary tools are available.
 

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BLANK PAGE
 

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3. ACCOMPLISHMENT INSTRUCTIONS

A. GENERAL INFORMATION

CAUTION: KEEP THE WORK AREA, WIRES AND ELECTRICAL BUNDLES CLEAN OF METAL

PARTICLES OR CONTAMINATION WHEN YOU USE TOOLS. UNWANTED

MATERIAL, METAL PARTICLES OR CONTAMINATION CAUGHT IN WIRE BUNDLES

CAN CAUSE DAMAGE TO THE BUNDLES. DAMAGED WIRE BUNDLES CAN CAUSE

SPARKS OR OTHER ELECTRICAL DAMAGE.

NOTE:

1. Manual titles are referred to by acronyms. Refer to Paragraph 1.J., References, for 

definition of the acronyms.

2. Obey all of the warnings and cautions given in the specified manual sections.

3. Unless shown differently, these dimensions and tolerances are used:

— Linear dimensions are in inches

— Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus or 

minus 0.03 inch.

— Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch

— Angular tolerance is plus or minus 2 degrees

— Hole dimensions for standard solid rivets are given in 747, 747-400, or 747-400F 

Structural Repair Manual, Chapter 51

— Torque limits to tighten nuts and bolts are given in 747, 747-400, or 747-400F 

Structural Repair Manual, Chapter 51.

4. For approved fastener and process material substitutions, refer to 747, 747-400, or 747-

400F Structural Repair Manual, Chapter 51. Alternate fasteners are given in 747, 747-

400, or 747-400F Structural Repair Manual Chapter 51 and Boeing Drawing 012W6100.

5. If the length of fasteners specified in this service bulletin do not meet the installation 

standards, fasteners of the same specification, or an approved substitute, one grip 

length longer or shorter may be used.

6. Start to do inspections at the time shown in Paragraph 1.E., Compliance.

7. A detailed inspection is defined as: An intensive examination of a specific item, 

installation, or assembly to detect damage, failure, or irregularity. Available lighting is 

normally supplemented with a direct source of good lighting at an intensity deemed 

appropriate. Inspection aids such as a mirror, magnifying lenses, etc., may be 

necessary. Surface cleaning procedures may be required. Inspection aids such as 10X 

magnifying lenses may be required.

8. Figures 1 - 18 show Group 1, 2, 3, 4, 5, 6, 7, 9, and 10 airplanes. Group 8 airplanes are 

similar, except as described below in each affected inspection area.

B. WORK INSTRUCTIONS

AREA 1 - UPPER DECK FLOOR BEAMS

1. Remove the equipment that follows from the main deck passenger cabin for access from below 
 

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to the upper deck floor beams. Use the AMM subjects that follow:

NOTE: All upper deck floor beam inspections are to be performed from below.

Group 1, 5-7: The upper deck floor beams to be inspected are from STA 260 to STA 1100. 

Group 2, 9: The upper deck floor beams to be inspected are from STA 260 to STA 740. 

Group 3, 10: The upper deck floor beams to be inspected are from STA 260 to STA 780. 

Group 4: The upper deck floor beams to be inspected are from STA 260 to STA 700.

Group 8: The upper deck floor beams to be inspected are from STA 260 to STA 500.

2. If necessary, loosen and remove air conditioning ducts for access to the inspection area.

3. Group 1, 5-7: Do inspections of the upper deck floor beams for cracks as shown in Figure 1.

4. Group 2, 9: Do inspections of the upper deck floor beams for cracks as shown in Figure 10.

5. Group 3, 10: Do inspections of the upper deck floor beams for cracks as shown in Figure 11.

6. Group 4: Do inspections of the upper deck floor beams for cracks as shown in Figure 12.

7. Group 8: Do inspections of the upper deck floor beams for cracks as shown in Figure 21.

8. For each frame from body station 260 to body station 520, do a detailed inspection for cracks in 

the frame inner chord, the frame outer chord, and the frame web in the area between the upper 

and lower chords of the upper deck floor beam as shown in Figure 18. Do these detailed 

inspections on both the left side and right side of the airplane.

9. If floor beam web cracks are found, repair before any more flights. Repair as shown in 747-400 

SRM 53-00-51, Figure 201, 747-400 SRM 53-10-51, Figure 201, 747 SRM 53-10-07, Figure 11, 

or ask Boeing for repair data.

Equipment AMM Subject

Ceiling Insulation 747-100/200/300 

AMM 25-21-04/401

747-400 AMM 

25-21-04/401

Main Passenger Cabin Ceiling Panels 747-100/200/300 

AMM 25-22-01/401

747-400 AMM 

25-22-01/401

Main Deck Track Mounted Passenger 

Seats

747-100/200/300 

AMM 25-25-01/401

747-400 AMM 

25-25-01/401

Center Overhead Stowage 

Compartments

747-100/200/300 

AMM 25-28-01/201

747-400 AMM 

25-28-02/401

Side Overhead Stowage Compartments 747-100/200/300 

AMM 25-28-01/201

747-400 AMM 

25-28-01/201

Main Deck Cargo Compartment Ceiling 

Lining

747-100/200/300 

AMM 25-59-01/401

747-400 AMM 

25-59-01/401

Main Deck Cargo Compartment Ceiling 

Insulation

747-100/200/300 

AMM 25-59-05/405

747-400 AMM 

25-59-05/401
 

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10. If any other floor beam cracks are found, repair before any more flights. Repair as shown in 

747-100/200/300 SRM 53-10-07 Figure 21 or 23, 747-400 SRM 53-10-51 Figure 205, 747-400 

SRM 53-20-51 Figure 204, or ask Boeing for repair data. 

11. If frame inner chord, frame outer chord, or frame web cracks are found, repair them as given in 

the structural repair manual, or contact Boeing for repair instructions.

12. After repair, install all equipment that was removed for access.

13. If no cracks are found, install all equipment that was removed for access.

14. Put the airplane back to a serviceable condition. Do the Area 1 inspection again at the time 

shown in Paragraph 1.E., Compliance. 

Group 1-7, 9-10: AREA 2 - SECTION 42 UPPER LOBE FRAMES

1. Remove the equipment that follows from the main deck passenger cabin and the upper deck 

passenger cabin for access to the Section 42 upper lobe frames, from the main deck floor to the 

top of the crown. Use the AMM subjects that follow:

2. If necessary, loosen and remove air conditioning ducts for access to the inspection area.

3. Group 1, 5-7: Do inspections of Area 2 for cracks as shown in Figure 2.

4. Group 2-4, 9-10: Do inspections of Area 2 for cracks as shown in Figure 13.

5. If cracks are found, repair before any more flights as follows:

a. Remove and replace cracked stringer clips before any more flights. Use 747-100/200/300 

SRM 53-10-03, or 747-400 SRM 53-00-03, or 747-400 SRM 53-00-03.

Equipment AMM Subject

Sidewall and Ceiling Insulation 747-100/200/300 

AMM 25-21-04/401

747-400 AMM 

25-21-04/401

Main Deck Track Mounted Passenger 

Seats

747-100/200/300 

AMM 25-25-01/401

747-400 AMM 

25-25-01/401

Side Overhead Stowage 

Compartments

747-100/200/300 

AMM 25-28-01/401

747-400 AMM 

25-28-01/201

Upper Deck Ceiling Panel 747-100/200/300 

AMM 25-22-03/401

747-400 AMM 

25-22-03/401

Upper Deck Window Reveal Panel 747-100/200/300 

AMM 25-21-02/401

747-400 AMM 

25-21-02/401

Main Deck Sidewall Lining Doorway 

Panels

747-100/200/300 

AMM 25-21-03/401

747-400 AMM 

25-21-03/401

Main Deck Cargo Compartment 

Sidewall Lining

747-100/200/300 

AMM 25-59-01/401

747-400 AMM 

25-59-01/401

Main Deck Cargo Compartment 

Sidewall Insulation

747-100/200/300 

AMM 25-59-05/401

747-400 AMM 

25-59-05/401
 

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b. Repair frame cracks before any more flights. Repair as shown in 747-100/200/300 SRM 

53-10-04, 747-400 SRM 53-20-07, 747-400F SRM 53-20-07, or ask Boeing for repair data.

c. If any other cracks are found, repair before any more flights. Repair as shown in the SRM, 

or ask Boeing for repair data. 

d. After repair, install all equipment that was removed for access.

6. If no cracks are found, install all equipment that was removed for access.

7. Put the airplane back to a serviceable condition. Do the Area 2 inspection again at the time given 

in Paragraph 1.E., Compliance.

AREA 3 - SECTION 46 LOWER LOBE FRAMES

1. Remove the equipment that follows for access to the Section 46 lower lobe frames, from the main 

deck floor down. Use the AMM subjects that follow:

NOTE: On Group 8 airplanes, it is not necessary to inspect the Section 46 lower lobe frames aft

of STA 1940. On the left side of the airplane, it is not necessary to inspect the Section

46 lower lobe frames above Stringer 34. On the right side of the airplane, it is not

necessary to inspect the Section 46 lower lobe frames above Stringer 34, except at STA

1810 and STA 1920. At STA 1810 and STA 1920 on the right side of the airplane, the

inspection area is from the main deck floor down.

Equipment AMM Subject

Sidewall Insulation 747-100/200/300 AMM 25-21-04/401 747-400 AMM 25-21-04/401

Main Deck Track Mounted 

Passenger Seats

747-100/200/300 AMM 25-25-01/401 747-400 AMM 25-25-01/401

Main Deck Sidewall Lining 

Doorway Panels

747-100/200/300 AMM 25-21-03/401 747-400 AMM 25-21-03/401

Cargo Compartment Lining Panels 747-100/200/300 AMM 25-52-01/401 747-400 AMM 25-52-01/401

Cargo Compartment Insulation 747-100/200/300 AMM 25-52-04/401 747-400 AMM 25-52-04/401

Ball Transfer Panels 747-100/200/300 AMM 25-53-15/401 747-400 AMM 25-53-15/401

Main Deck Floor Panels (a) 747-100/200/300 AMM 53-21-02/401 747-400 AMM 53-21-02/401

Bulk Cargo Compartment Lining 747-100/200/300 AMM 25-55-02/401 747-400 AMM 25-55-02/401

Main Deck Cargo Compartment 

Sidewall Lining

747-100/200/300 AMM 25-59-01/401 747-400 AMM 25-59-01/401

Main Deck Cargo Compartment 

Sidewall Insulation

747-100/200/300 AMM 25-59-05/401 747-400 AMM 25-59-05/401

Bulk Cargo Compartment 

Insulation

747-100/200/300 AMM 25-55-03/401 747-400 AMM 25-55-03/401

Bulk Cargo Compartment Floor 

Panels

- -

(a) From STA 2180 to STA 2360 for access to the lower lobe frames aft of the bulk cargo compartment.
 

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2. If necessary, loosen and remove air conditioning ducts for access to the inspection area.

3. Do inspections of Area 3 for cracks as shown in Figure 3.

4. If cracks are found, repair before any more flights as follows:

a. Remove and replace cracked stringer clips before any more flights. Use 747-100/200/300 

SRM 53-10-03, or 747-400 SRM 53-00-03, or 747-400 SRM 53-00-03.

b. Repair frame cracks before any more flights. Repair as shown in 747-100/200/300 SRM 

53-10-04, 747-400 SRM 53-60-07, 747-400F SRM 53-60-07, or ask Boeing for repair data.

c. If any other cracks are found, repair before any more flights. Repair as shown in the SRM, 

or ask Boeing for repair data.

d. After repair, install all equipment that was removed for access.

5. If no cracks are found, install all equipment that was removed for access.

6. Put the airplane back to a serviceable condition. Do the Area 3 inspection again at the time given 

in Paragraph 1.E., Compliance.

AREA 4 - SECTION 42 LOWER LOBE FRAMES

1. Remove the equipment that follows for access to the Section 42 lower lobe frames, from the main 

deck floor down. Use the AMM subjects that follow:

NOTE: On Group 8 airplanes, it is not necessary to inspect the STA 540 lower lobe frame from

S-26L to S-39R. On the left side of the airplane, it is not necessary to inspect the Section

42 lower lobe frames above Stringer 34. On the right side of the airplane, it is not

necessary to inspect the Section 42 lower lobe frames above Stringer 28 from STA 580

to STA 660, or above Stringer 34 from STA 680 to STA 980.

2. If necessary, loosen and remove air conditioning ducts for access to the inspection area.

3. Do inspections of Area 4 for cracks as shown in Figure 4.

4. If cracks are found, repair before any more flights as follows:

a. Remove and replace cracked stringer clips before any more flights. Use 747-100/200/300 

SRM 53-10-03, or 747-400 SRM 53-00-03, or 747-400 SRM 53-00-03.

b. Repair frame cracks before any more flights. Repair as shown in 747-100/200/300 SRM 

53-10-04, 747-400 SRM 53-20-07, 747-400F SRM 53-20-07, or ask Boeing for repair data.

c. If any other cracks are found, repair before any more flights. Repair as shown in the SRM, 

or ask Boeing for repair data. 

Equipment AMM Subject

Cargo Compartment Lining Panels 747-100/200/300 AMM 25-52-01/401 747-400 AMM 25-52-01/401

Cargo Compartment Insulation 747-100/200/300 AMM 25-52-04/401 747-400 AMM 25-52-04/401

Ball Transfer Panels 747-100/200/300 AMM 25-53-15/401 747-400 AMM 25-53-15/401
 

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d. After repair, install all equipment that was removed for access.

5. If no cracks are found, install all equipment that was removed for access.

6. Put the airplane back to a serviceable condition. Do the Area 4 inspection again at the time given 

in Paragraph 1.E., Compliance. 

Group 1-7, 9-10: AREA 5 - SECTION 46 UPPER LOBE FRAMES

1. Remove the equipment that follows for access to the Section 46 upper lobe frames, from the main 

deck floor to Stringer 20. Use the AMM subjects that follow:

2. If necessary, loosen and remove air conditioning ducts for access to the inspection area.

3. Group 1, 5: Do inspections of Area 5 for cracks as shown in Figure 5.

4. Group 2, 4, 9: Do inspections of Area 5 for cracks as shown in Figure 16.

5. Group 3, 6-7, 10: Do inspections of Area 5 for cracks as shown in Figure 17.

6. If cracks are found, repair before any more flights as follows:

a. Remove and replace cracked stringer clips before any more flights. Use 747-100/200/300 

SRM 53-10-03, or 747-400 SRM 53-00-03, or 747-400 SRM 53-00-03.

b. Repair frame cracks before any more flights. Repair as shown in 747-100/200/300 SRM 

53-10-04, 747-400 SRM 53-60-07, 747-400F SRM 53-60-07, or ask Boeing for repair data.

c. If any other cracks are found, repair before any more flights. Repair as shown in the SRM, 

or ask Boeing for repair data.

d. After repair, install all equipment that was removed for access.

7. If no cracks are found, install all equipment that was removed for access.

8. Put the airplane back to a serviceable condition. Do the Area 5 inspection again at the time given 

in Paragraph 1.E., Compliance.

Equipment AMM Subject

Sidewall Insulation 747-100/200/300 AMM 25-21-04/401 747-400 AMM 25-21-04/401

Main Deck Track Mounted 

Passenger Seats

747-100/200/300 AMM 25-25-01/401 747-400 AMM 25-25-01/401

Side Overhead Stowage 

Compartments

747-100/200/300 AMM 25-28-01/401 747-400 AMM 25-28-01/201

Main Deck Sidewall Lining 

Doorway Panels

747-100/200/300 AMM 25-21-03/401 747-400 AMM 25-21-03/401

Main Deck Cargo Compartment 

Sidewall Lining

747-100/200/300 AMM 25-59-01/401 747-400 AMM 25-59-01/401

Main Deck Cargo Compartment 

Sidewall Insulation

747-100/200/300 AMM 25-59-05/401 747-400 AMM 25-59-05/401
 

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AREA 6 - MAIN ENTRY DOOR CUTOUTS

1. Open each Main Entry Door. At each Main Entry Door, remove the equipment that follows for 

access to the door cutout. Also remove and keep the threshold and scuff plate at each Main 

Entry Door.

NOTE: Do inspections of the cutouts of all of the main entry doors. This includes any door that

may have been deactivated. 

2. Group 1, 3, 5-8: Do inspections of Area 6 for cracks as shown in Figure 6.

NOTE: On Group 8 airplanes, only the cutouts for Main Entry Door 1 left and right are affected.

3. Group 2, 4: Do inspections of Area 6 for cracks as shown in Figure 14.

4. Group 9: Do inspections of Area 6 for cracks as shown in Figure 19.

5. Group 10: Do inspections of Area 6 for cracks as shown in Figure 20.

6. If cracks are found, repair before any more flights as follows:

a. Repair frame cracks before any more flights. Repair as shown in 747-100/200/300 SRM 

53-10-04, 747-400 SRM 53-10-07, 747-400 SRM 53-20-07747-400 SRM 53-60-07, 747-

400F SRM 53-10-07, or 747-400F SRM 53-60-07, or ask Boeing for repair data.

b. Repair other door surround structure cracks before any more flights. Repair as shown in 

747-100/200/300 SRM 53-30-03, 747-400 SRM 53-60-15 or 747-400F SRM 53-60-15, or 

ask Boeing for repair data.

c. If any other cracks are found, repair before any more flights. Repair as shown in the SRM, 

or ask Boeing for repair data.

d. After repair, install all equipment that was removed for access.

7. If no cracks are found, install all equipment that was removed for access.

8. Put the airplane back to a serviceable condition. Do the Area 6 inspection again at the time 

shown in Paragraph 1.E., Compliance. 

Equipment AMM Subject

Sidewall Insulation 747-100/200/300 AMM 25-21-04/401 747-400 AMM 25-21-04/401

Main Deck Sidewall Lining 

Doorway Panels

747-100/200/300 AMM 25-21-03/401 747-400 AMM 25-21-03/401

Cargo Compartment Ceiling and 

Sidewall Lining

747-100/200/300 AMM 25-52-01/401 747-400 AMM 25-52-01/401

Cargo Compartment Insulation 747-100/200/300 AMM 25-52-04/401 747-400 AMM 25-52-04/401

Main Deck Cargo Compartment 

Sidewall Lining

747-100/200/300 AMM 25-59-01/401 747-400 AMM 25-59-01/401

Main Deck Cargo Compartment 

Sidewall Insulation

747-100/200/300 AMM 25-59-05/401 747-400 AMM 25-59-05/401
 

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AREA 7 - SECTION 41 STA 260, 340, AND 400 BULKHEADS, AND NOSE WHEEL WELL 

SIDEWALL FROM STA 340 TO STA 400

1. Remove the insulation blankets from the STA 260, 340, and 400 bulkheads and the sidewall 

panels from STA 340 to STA 400. Also remove the insulation blankets from the nose wheel well 

top panel in the area of the STA 360 and 380 floor beams. Keep the insulation blankets for later 

installation.

2. Do inspections of Area 7 for cracks as shown in Figure 7.

3. If cracks are found, repair before any more flights. Repair as shown in 747-100/200/300 SRM 

53-10-04747-400 SRM 53-10-08, or 747-400F SRM 53-10-08, or ask Boeing for repair data. 

After repair, install all equipment that was removed for access.

4. If no cracks are found, install all equipment that was removed for access.

5. Put the airplane back to a serviceable condition. Do the Area 7 inspection again at the time given 

in Paragraph 1.E., Compliance. 

AREA 8 - MAIN ENTRY DOORS

1. Remove the lining and insulation from all Main Entry Doors. Use 747 AMM 52-11-02/401.

NOTE: On Group 8 airplanes, only Main Entry Door 1 left and right is affected.

CAUTION: Group 1, 3, 5-8, 10: DO STRUCTURAL INSPECTIONS OF ALL MAIN ENTRY DOORS

AS SHOWN IN THIS SERVICE BULLETIN, INCLUDING DOORS THAT HAVE BEEN

DEACTIVATED. DEACTIVATED MAIN ENTRY DOORS ARE SUBJECT TO THE

TYPES OF FATIGUE CRACKS SHOWN IN THIS SERVICE BULLETIN.

2. Group 1, 3, 5-8, 10: Do inspections of Area 8 for cracks as shown in Figure 8.

CAUTION: Group 2, 4, 9: DO STRUCTURAL INSPECTIONS OF ALL MAIN ENTRY DOORS AS

SHOWN IN THIS SERVICE BULLETIN, INCLUDING DOORS THAT HAVE BEEN

DEACTIVATED. DEACTIVATED MAIN ENTRY DOORS ARE SUBJECT TO THE

TYPES OF FATIGUE CRACKS SHOWN IN THIS SERVICE BULLETIN.

3. Group 2, 4, 9: Do inspections of Area 8 for cracks as shown in Figure 15.

4. If cracks are found, repair before any more flights. Repair as shown in 747-100/200/300 SRM 

52-00-03, 747-100/200/300 SRM 52-10-02, 747-400 SRM 52-10-01, 747-400 SRM 52-10-02, 

747-400F SRM 52-10-01, or 747-400F SRM 52-10-02, or ask Boeing for repair data. After 

repair, install all equipment that was removed for access.

5. If no cracks are found, install all equipment that was removed for access.

6. Put the airplane back to a serviceable condition. Do the Area 8 inspection again at the time given 

in Paragraph 1.E., Compliance. 

AREA 9 - MAIN ELECTRONICS BAY ACCESS DOOR CUTOUT

1. Open the Main Electronics Bay access door, just aft of the nose wheel well.
 

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ALERT ALERT

2. Do internal and external detailed inspections of Area 9 for cracks as shown in Figure 9.

3. If cracks are found, repair before any more flights. Repair skin cracks as shown in 747-100/200/

300 SRM 53-00-01, 747-400 SRM 53-00-01, or 747-400F SRM 53-00-01, or ask Boeing for 

repair data.

4. If no cracks are found, close the Main Electronics Bay access door.

5. Put the airplane back to a serviceable condition. Do the Area 9 inspection again at the time given 

in Paragraph 1.E., Compliance. 
 FIGURE 1: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 1, 5, 6, AND 7 AIRPLANES

December 21, 2004

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ALERT ALERT

FIGURE 1: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 1, 5, 6, AND 7 AIRPLANES

(TYPICAL)

FLOOR BEAMS

ALL UPPER DECK

SEE A THROUGH F

1

W59452

(SHEET 1 OF 5)
 FIGURE 1: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 1, 5, 6, AND 7 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

LEFT SIDE SHOWN

(RIGHT SIDE OPPOSITE)

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

BL

0

LBL

24.17

LBL

46.83

LBL

60

LBL

80

520

STA

500

STA

STA

480

460

STA

440

STA

420

STA

BL

0

LBL

20

LBL

40

LBL

60

LBL

80

STA

340 STA

330 STA

320

STA

302

STA

287

STA

270

STA

360

STA

380

STA

400

A

B

FWD

UP

FWD

UP

W59472

(SHEET 2 OF 5)
 FIGURE 1: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 1, 5, 6, AND 7 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

LEFT SIDE SHOWN

(RIGHT SIDE OPPOSITE)

LBL

100

80

LBL 60

LBL 40

LBL 20

LBL 0

BL STA

720 STA

700 STA

680 STA

660 STA

640 STA

620 STA

600 STA

580 STA

560 STA

540

C

FWD

UP

W59530

(SHEET 3 OF 5)
 FIGURE 1: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 1, 5, 6, AND 7 AIRPLANES

December 21, 2004

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ALERT ALERT

CARTLIFT

ACCESS

880

STA

860

STA

840

STA

820

STA

800

STA

780

STA

760

STA

740

STA

900

STA 920

STA 940

STA 960

STA 980

STA

BL 80

BL 60

BL 40

BL 20

BL 0

RIGHT SIDE

LEFT SIDE

920

STA 940

STA 960

STA 980

STA

880

STA

860

STA

840

STA

820

STA

800

STA

780

STA

760

STA

740

STA

LBL 100

LBL 80

LBL 60

LBL 40

LBL 20

900

STA

ACCESS

STAIRWAY

FWD

UP

FWD

UP

E

D

480179

(SHEET 4 OF 5)
 FIGURE 1: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 1, 5, 6, AND 7 AIRPLANES

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ALERT ALERT

This Figure applies to Group 1, 5-7: 

The step number shown below agrees with the number shown in the circle symbol in the figure. 

NOTE: If necessary, loosen and remove air conditioning ducts for access to the inspection area.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Upper Chord Detailed - From below the floor 

beams (a) Floor Beam Web

Lower Chord

Cab Floor Web

(a) The inspection area is from STA 260 to STA 1100. Pay particular attention to all nutplate locations, 

cutout locations, and to the floor beam connections to the frames. Also inspect the cab floor web (in 

the plane of the floor) from STA 260 to STA 330. Pay particular attention to all cutouts and nutplate 

locations.

NOTE: At STA 260, inspect the chord that is common to the cab floor web. Also inspect the

adjacent 2 inches of the vertical web.

STA

1100

STA

1080

STA

1060

STA

1040

STA

1020

1000

STA

LBL

80.56

LBL

54.00

24.17

LBL

7.50

LBL

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

INBD

F

FWD

UP

W59575

(SHEET 5 OF 5)
 FIGURE 2: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 1, 5, 6, AND 7 

AIRPLANES

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ALERT ALERT

FIGURE 2: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 1, 5, 6, AND 7 

AIRPLANES

540

STA

STA

720

STA

980

S-0

S-39

S-22

S-10A SEE A

SEE F

SEE C

SEE B

SEE E

SEE D

W59603

(SHEET 1 OF 8)
 FIGURE 2: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 1, 5, 6, AND 7 

AIRPLANES

December 21, 2004

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ALERT ALERT

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

STA

720

STA

700

STA

680

STA

660

STA

STA 540

560 STA

STA 580

600 STA

620 STA

640

S-2A

S-2

S-1

S-0

S-3

S-4

S-5

S-6

S-7

S-8

S-9

S-10

S-10A

FWD

1

A

W59621

(SHEET 2 OF 8)
 FIGURE 2: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 1, 5, 6, AND 7 

AIRPLANES

December 21, 2004

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ALERT ALERT

LEFT SIDE SHOWN

(RIGHT SIDE OPPOSITE)

STA STA

STA

STA

STA

STA

STA

STA

STA

STA

720 700

680

660

620

640

600

580

560

540

S-11

S-12

S-13

S-14

S-15

S-16

S-17

S-18

S-19

S-20

S-21

S-22

B

1

W59638

FWD

(SHEET 3 OF 8)
 FIGURE 2: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 1, 5, 6, AND 7 

AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

LEFT SIDE SHOWN

DOOR CUTOUT IS BELOW S-26)

(RIGHT SIDE OPPOSITE, EXCEPT THE CARGO

S-27

S-26

S-28

S-29

S-23

S-24

S-25

720

STA

700

STA

680

660

STA

STA

640

620

STA

STA

600

580

STA

STA

560

540

STA

STA

C

1

W59639

FWD

(SHEET 4 OF 8)
 FIGURE 2: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 1, 5, 6, AND 7 

AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT LEFT SIDE SHOWN (RIGHT SIDE OPPOSITE) S-10A S-10S-9 S-8S-7 S-6S-5 S-4S-3A S-3S-2A S-2 S-0 S-1 STA STA STA STA 980 960 920 900 940 STA 780 STA STA STA STA STA STA 860 840 820 800 880 STA STA 760 740 FWD

1

D

W59645

(SHEET 5 OF 8)
 FIGURE 2: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 1, 5, 6, AND 7 

AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

LEFT SIDE SHOWN

SHOWN FOR CLARITY

UPPER DECK FLOOR BEAMS NOT

(RIGHT SIDE OPPOSITE)

STA

980

960

STA

STA

940

STA

900 STA

920

STA

880

STA

860

STA

820 STA

840

STA

800

STA

780

STA

760

STA

740

S-22

S-21

S-20

S-18

S-17

S-16

S-15

S-14

S-13

S-12

S-11

S-19

FWD

1

E

W59651

(SHEET 6 OF 8)
 FIGURE 2: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 1, 5, 6, AND 7 

AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

S-27

S-26

LEFT SIDE SHOWN

(RIGHT SIDE OPPOSITE)

S-23

S-24

S-25

S-28

S-29

S-30

S-31

S-32

S-33

S-34

840

STA

STA

820

STA

980

960

STA 940

STA

STA

920

STA

900

STA

880

860

STA

STA

800

STA

780

STA

760

STA

740

FWD

1

F

W59666

(SHEET 7 OF 8)
 FIGURE 2: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 1, 5, 6, AND 7 

AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

This Figure applies to Group 1, 5-7: 

The step number shown below agrees with the number shown in the circle symbols in the figure. 

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Upper Lobe Frames Detailed - (a) (b)

(a) The inspection area is from STA 520 to STA 1000, from the main deck floor to the top of the crown.

(b) Pay particular attention to frame inner chords at the last fastener in a reinforcing strap, frame 

webs, fail-safe chords, and stringer cutouts.

(SHEET 8 OF 8)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

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ALERT ALERT

FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

S-39R

S-39L

STA

1500

S-0

2160

STA

1720

STA

1980

STA

2360

STA

INSTALLED ON SOME AIRPLANES.

MAIN DECK SIDE CARGO DOOR

TYPICAL AIRPLANE SHOWN,

SEE B D G

SEE A

SEE

SEE H F

SEE E C

I

W59671

(SHEET 1 OF 11)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

S-24

S-23

S-22

S-39

S-38

S-37

S-36

S-35

S-34

S-33

S-31

S-29

S-28

S-32

S-30

S-27

STA

S-16

S-25

S-8

S-9

S-10

S-11

S-12

S-13

S-14

S-15

S-17

S-18

S-19

S-20

S-2

S-1

S-3

S-4

S-5

S-6

S-7

STA

1520

STA

1560

STA

1600

1580

STA

1540

STA

1500

STA

1640

STA

1680

STA

1620

STA

1660

STA

1700

STA

1720

LEFT SIDE SHOWN

POSTS NOT SHOWN FOR CLARITY

MAINDECK FLOOR BEAMS AND

(RIGHT SIDE OPPOSITE)

1

A

FWD

W59676

(SHEET 2 OF 11)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

SIDE SHOWN

LEFT AND RIGHT

S-42R

S-40R

S-44R

S-46R

S-48R S-51R

S-50R

S-51L

S-48L

S-46L

S-44L

S-42L

S-40L

S-50L

STA

1580

STA

1540

STA

1500

STA

1600

STA

1560

STA

1520

STA

1620

STA

1700

STA

1720

STA

1660

STA

1640

STA

1680

FWD

B

1

W59699

(SHEET 3 OF 11)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

S22

S21

S23

S25

S26 S27

S28

S34

S32

POSTS NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS AND

LEFT SIDE SHOWN

S2

S4

S6

S8

S10

S12

S9

S7

S5

S3

S1

S11

S13

S15

S17

S19

S30

S36

S38

S20

S29

S31

S33

S37

S39

STA

1840

STA

1800

STA

1760

1860

STA

1820

STA

1780

STA

1740

STA

1880 1960

STA

1920

STA STA

1940

STA

1900

STA 1980

STA

S35

S18

S16

S14

FWD

C

1

W59850

(SHEET 4 OF 11)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT LEFT AND RIGHT SIDE SHOWN S-44R S-46R S-48R S-50R S-51L S-41L S-43L S-45L S-47L S-49L STA 1800 STA 1760 STA 1820 STA 1780 STA 1740 STA 1860 STA 1900 STA 1840 STA 1880 STA 1940 STA 1920 STA 1980STA 1960

D

1

W59892

FWD

(SHEET 5 OF 11)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

S-26R

CLARITY

POSTS NOT SHOWN FOR

MAIN DECK FLOOR BEAMS AND

RIGHT SIDE SHOWN,

S-22R

S-23R

S-24R

S-25R

S-27R

S-28R

S-29R

S-30R

S-31R

S-32R

S-33R

S-34R

S-35R

S-36R

S-37R

S-39R

S-38R

1860

STA 1880

STA

1900

STA 1920

STA

1940

STA STA

1960 1980

STA

1840

STA

1820

STA

1800

STA STA

1780 1760

STA

1740

STA

1

E

W59982

FWD

(SHEET 6 OF 11)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

POSTS NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS AND

LEFT SIDE SHOWN,

S-2

S-4

S-6

S-8

S-10

S-12

S-1

S-3

S-7

S-11

S-5

S-9

S-13

S-14

S-25

S-20

S-22

S-15

S-17

S-19

S-16

S-18

S-23 S-24

S-31

S-29

S-27

S-26

S-28

S-30

S-32

S-34

S-35 S-36

S-38 S-37

S-33

S-39

STA

2000

STA

2020 STA

2060

STA

STA 2040

2080

STA

2120

STA

2100 STA

2140

STA

2160

FWD

1

F

W59991

(SHEET 7 OF 11)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT LEFT AND RIGHT SIDE SHOWN S51LS49LS47LS45LS43LS41L S50R S44R S43R S46RS48R S42R STA 2000 STA 2020 STA 2040 STA 2060 STA 2080 STA 2100 STA 2120 STA 2140 STA 2160 S41R

S40L

S42L

S44L

S46L

S48L

S50L

S51R

S49R

S47R

S45R

FWD

G

1

W60000

(SHEET 8 OF 11)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

S-22

S-23

S-24

S-25

S-26

S-27

S-28

S-29

S-30

S-31

S-32

S-33

S-34

S-35

S-36

S-39

S-37

S-38

2160

STA

2140

STA

2120

STA

2100

STA

2080

STA

2060

STA

2040

STA

2020

STA

2000

STA

POSTS NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS AND

RIGHT SIDE SHOWN,

FWD

1

H

W60023

(SHEET 9 OF 11)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT STA 2180 STA 2200 STA 2220 STA 2240 STA 2260 STA 2280 STA 2360 STA 2340 STA 2320 STA 2300 S49S47 S44 S48 S50 (RIGHT SIDE OPPOSITE) LEFT SIDE SHOWN S28 S29 S30 S31 S32 S33 S34 S35 S36 S37 S38 S51 S40 S42 S46

1

I

W60070

FWD

(SHEET 10 OF 11)
 FIGURE 3: INSPECTION OF AREA 3 - SECTION 46 LOWER LOBE FRAMES

December 21, 2004

Revision 1: September 25, 2008 747-53A2500

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

The step number shown below agrees with the number shown in the circle symbols in the figure. 

NOTE: The STA 1480 bulkhead is not shown.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Lower Lobe Frames Detailed - (a) (b)

(a) The inspection area is from STA 1480 to STA 2360, from the main deck floor down.

(b) Pay particular attention to frame inner chords at the last fastener in a reinforcing strap, frame 

webs, fail-safe chords, and stringer cutouts.

(SHEET 11 OF 11)
 FIGURE 4: INSPECTION OF AREA 4 - SECTION 42 LOWER LOBE FRAMES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

FIGURE 4: INSPECTION OF AREA 4 - SECTION 42 LOWER LOBE FRAMES

S-39R

S-39L

S-10A

S-0

S-22

S-39

STA

980

STA

720

STA

540

SEE C D F

SEE E

SEE A B

W60099

(SHEET 1 OF 8)
 FIGURE 4: INSPECTION OF AREA 4 - SECTION 42 LOWER LOBE FRAMES

December 21, 2004

Revision 1: September 25, 2008 747-53A2500

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

S-39

STA

STA

STA

STA

STA

STA

STA

STA

STA

STA

720

SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS NOT

LEFT SIDE SHOWN,

S-25

S-23

S-24

700

680

660

640

620

600

580

560

540

S-26

S-27

S-28

S-29

S-30

S-31

S-32

S-33

S-34

S-35

S-36

S-37

S-38

FWD

1

A

W60118

(SHEET 2 OF 8)
 FIGURE 4: INSPECTION OF AREA 4 - SECTION 42 LOWER LOBE FRAMES

December 21, 2004

Revision 1: September 25, 2008 747-53A2500

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ALERT ALERT

S-22

S-23

S-24

S-25

S-26

S-27

S-28

S-29

S-32

S-30

S-31

S-34

S-33

S-35

S-36

S-37

S-38

S-39

SHOWN FOR CLARITY

MAIN DECK FLOOR BEANS NOT

RIGHT SIDE ONLY,

STA

720

STA

STA

STA 700

680

660

STA

STA

640

620

STA

STA

600

580

STA

STA

560

540

1

B

W60126

FWD

(SHEET 3 OF 8)
 FIGURE 4: INSPECTION OF AREA 4 - SECTION 42 LOWER LOBE FRAMES

December 21, 2004

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ALERT ALERT LEFT AND RIGHT SIDE SHOWN STA 620 STA 540 STA 560 STA 580 STA 600 S-41R S-47L S-47R S-46R S-45RS-44R S-42R S-40L S-41L S-42L S-43L S-44L S-45L S-46L S-43R S-40R FWD

1

C

W60167

(SHEET 4 OF 8)
 FIGURE 4: INSPECTION OF AREA 4 - SECTION 42 LOWER LOBE FRAMES

December 21, 2004

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ALERT ALERT S-40R S-41R S-43R S-44R S-42R S-45R S-46R S-40L S-41L S-42LS-43L S-44L S-45LS-46LS-47LS-47R STA 640 STA 660 STA 680 STA 700 STA 720 LEFT AND RIGHT SIDE SHOWN FWD

1

D

W60178

(SHEET 5 OF 8)
 FIGURE 4: INSPECTION OF AREA 4 - SECTION 42 LOWER LOBE FRAMES

December 21, 2004

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ALERT ALERT

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS AND POSTS

(RIGHT SIDE OPPOSITE EXCEPT AS NOTED)

LEFT SIDE SHOWN

S-39

S-38

S-37

S-36

S-35

S-34

S-33

S-32

S-31

S-30

S-25

S-26

S-27

S-28

S-23

S-24

STA

840 STA

820

STA

920

STA

940

STA

960

STA

980

STA

860

STA

740

STA

760

STA

780

STA

800

STA

STA 900

880

(LEFT SIDE ONLY)

OUTFLOW VALVE

FWD

E

1

W60185

(SHEET 6 OF 8)
 FIGURE 4: INSPECTION OF AREA 4 - SECTION 42 LOWER LOBE FRAMES

December 21, 2004

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ALERT ALERT LEFT AND RIGHT SIDE SHOWN 880 900 940 920 960 STA 980 STA STA STA STA STA STA 860 STA 840 STA 820 STA 800 STA 780 STA 760 STA 740 FWD

F

1

W60194

(SHEET 7 OF 8)
 FIGURE 4: INSPECTION OF AREA 4 - SECTION 42 LOWER LOBE FRAMES

December 21, 2004

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ALERT ALERT

The step number shown below agrees with the number shown in the circle symbols in the figure. 

NOTE: The STA 520 frame and the STA 1000 bulkhead are not shown.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Lower Lobe Frames Detailed - (a) (b)

(a) The inspection area is from STA 520 to STA 1000, from the main deck floor down.

(b) Pay particular attention to frame inner chords at the last fastener in a reinforcing strap, frame 

webs, fail-safe chords, and stringer cutouts.

(SHEET 8 OF 8)
 FIGURE 5: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 1 AND 5 AIRPLANES

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ALERT ALERT

FIGURE 5: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 1 AND 5 

AIRPLANES

STA

2360

STA

2160

STA

1980

STA

1720

STA

1500

S-0

SEE D

SEE C

SEE B

SEE A

W60199

(SHEET 1 OF 6)
 FIGURE 5: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 1 AND 5 AIRPLANES

December 21, 2004

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ALERT ALERT

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

S-26

S-24

S-23

S-27

S-28

S-32

S-33

S-34

S-35

S-36

S-37

S-38

S-39

1700

STA

1660

STA

1620

STA

1580

STA

1540

STA

1500

STA

1520

STA

1560

STA

1600

STA

1640

STA

1680

STA

1720

STA

S-11

S-12

S-13

S-14

S-15

S-16

S-17

S-18

S-19

S-25

S-1

S-2

S-3

S-4

S-5

S-6

S-7

S-8

S-9

S-10

S-20

S-22

S-29

S-30

S-31

POSTS NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS AND

1

A

FWD

W60201

(SHEET 2 OF 6)
 FIGURE 5: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 1 AND 5 AIRPLANES

December 21, 2004

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ALERT ALERT

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS AND POSTS

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

S38

S36

S31

S24 S23

S16

S18

S20

S17

S15

S6

S8

S10

S14

S12

S4

S2

S39

S37

S35

S33 S32

S30

S29 S28

S27

S19

S13

S11

S9

S7

S5

S3

S1

STA

1940 1900

STA

1860

STA

1820

STA

1780

STA STA

1740

1920

STA

1880

STA

1840

STA

1800

STA

1760

STA

1980

STA 1960

STA

B

FWD

1

W60221

(SHEET 3 OF 6)
 FIGURE 5: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 1 AND 5 AIRPLANES

December 21, 2004

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ALERT ALERT

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS AND POSTS

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

S-8

S-6

S-4

S-1 S-2

S-3

S-5

S-7

S-9

S-10

S-20

S-11

S-12

S-13

S-14

S-15

S-16

S-18

S-19

S-22

S-23

S-24 S-25

S-26

S-27

S-28

S-29

S-30

S-31

S-32

S-33

S-34

S-35

S-36

S-38

S-39

S-37

STA

2040

STA

2000

STA

2020

STA

2060

2140

STA

STA

2100

STA

2120

STA

2080

STA

2160

S-17

FWD

1

C

W60290

(SHEET 4 OF 6)
 FIGURE 5: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 1 AND 5 AIRPLANES

December 21, 2004

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ALERT ALERT

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

S-25

S-24

S-23

S-22

S-20

S-19

S-18

S-17

S-16

S-15

S-14

S-13

S-12

S-11

S-10

S-9

S-4

S-5

S-6

S-3

S-2

S-7

S-8

S-1

STA

2180 STA

2200 STA

2220 STA

2240 STA

2260 STA

2280 STA

2300 STA

2320

2340

STA

2360

STA

S-26

FWD

D

1

W60305

(SHEET 5 OF 6)
 FIGURE 5: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 1 AND 5 AIRPLANES

December 21, 2004

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ALERT ALERT

This Figure applies to Group 1, 5: 

The step number shown below agrees with the number shown in the circle symbols in the figure. 

NOTE: The STA 1480 bulkhead is not shown.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Upper Lobe Frames Detailed - (a) (b)

(a) The inspection area is from STA 1480 to STA 2360, from the main deck floor to the top of the crown.

(b) Pay particular attention to frame inner chords at the last fastener in a reinforcing strap, frame webs, 

fail-safe chords, and stringer cutouts.

(SHEET 6 OF 6)
 FIGURE 6: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 1, 3, 5, 6, 7, and 8 AIRPLANES

December 21, 2004

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ALERT ALERT

FIGURE 6: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 1, 3, 5, 6, 7, and 8 

AIRPLANES

ENTRY DOOR

NO. 1 MAIN

NO. 2 MAIN

ENTRY DOOR

NO. 3 MAIN

ENTRY DOOR

ENTRY DOOR

NO. 4 MAIN

ENTRY DOOR

NO. 5 MAIN

SEE C

SEE D

SEE E

SEE F

SEE A

SEE B

W60324

(SHEET 1 OF 8)
 FIGURE 6: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 1, 3, 5, 6, 7, and 8 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

STA

520

STA

500

420

STA

400

STA

(RIGHT SIDE OPPOSITE)

MAIN ENTRY DOOR NO. 1

LEFT SIDE SHOWN

LOWER MAIN SILL

UPPER MAIN SILL

FORWARD FRAME

S-22

S-23

S-24

S-26

S-27

S-28

S-30

S-20

S-19

S-18

S-17

S-16

S-15

S-14

S-13

AFT FRAME

REVEAL

ASSEMBLY

STA

480

STA

460

STA

440

LOWER

AUXILLIARY SILL

UPPER DECK FLOOR BEAM

LOWER CHORDS

FWD

1

A

W60427

(SHEET 2 OF 8)
 FIGURE 6: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 1, 3, 5, 6, 7, and 8 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

S-3

S-3A

S-4

S-6

S-5

S-8

S-9

S-10

S-10A

S-11

S-12

S-7A

S-7

STA

400 STA

420 STA

440

STA

460

STA

480

STA

500

STA

520

FWD

2

B

LEFT SIDE SHOWN, RIGHT SIDE OPPOSITE

1559279

(SHEET 3 OF 8)
 FIGURE 6: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 1, 3, 5, 6, 7, and 8 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

FORWARD FRAME

STOP INTERCOSTAL

(9 LOCATIONS)

UPPER SILL

AFT FRAME

LOWER

AUXILIARY

SILL

LOWER SILL

854

STA

860

STA

STA

780

800

STA

820

STA

840

STA

STA

880

UPPER AUXILIARY SILL

S-29

S-28

S-27

S-24

S-23

S-22

S-16

S-15

S-20

S-18

S-17

S-19

S-30

S-14

S-13

MAIN ENTRY DOOR NO. 2

LEFT SIDE SHOWN

(RIGHT SIDE OPPOSITE)

FWD

3

3

C

W60430

(SHEET 4 OF 8)
 FIGURE 6: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 1, 3, 5, 6, 7, and 8 AIRPLANES

December 21, 2004

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ALERT ALERT

MAIN ENTRY DOOR NO. 3

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

S-13

S-14

S-15

S-22

S-18

S-20

S-19

S-26

S-25

S-24

S-23

S-16

S-17

STA

1241

STA

1350

STA

1335

STA

1319

STA

1301

STA

1283

STA

1265

UPPER SILL

INTERCOSTAL

AFT STOP

(9 LOCATIONS)

AFT FRAME

LOWER SILL

FORWARD FRAME

INTERCOSTAL

FORWARD STOP

(9 LOCATIONS)

UPPER AUXILIARY SILL

FWD

D

3

3

W60763

(SHEET 5 OF 8)
 FIGURE 6: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 1, 3, 5, 6, 7, and 8 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

MAIN ENTRY DOOR NO. 4

LEFT SIDE SHOWN

(RIGHT SIDE OPPOSITE)

THRESHOLD

AFT FRAME

UPPER MAIN SILL

S-15

FORWARD

STOP ASSEMBLY

S-19

FORWARD FRAME

S-24

S-22

ASSEMBLY

FORWARD STOP

LOWER AUXILIARY SILL LOWER MAIN SILL

STA 1640

UPPER AUXILIARY SILL

STA 1680

STA 1700 S-17

S-13

FWD

E

3

3

W60798

(SHEET 6 OF 8)
 FIGURE 6: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 1, 3, 5, 6, 7, and 8 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

This Figure applies to Group 1, 3, 5-8: 

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. 

2220

STA

S-20

S-22

FORWARD

ASSEMBLY

STOP

UPPER SILL

AUXILIARY SILL

UPPER

FRAME

2280

STA

LOWER AUXILIARY SILL

THRESHOLD

S-27

S-24

S-19

FRAME

S-17

S-14

S-13

2240

STA

2260

STA

2280

STA

2200

STA

2220

STA

2240

STA

2260

STA

MAIN ENTRY DOOR NO. 5

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

LOWER SILL

STA

2300

FWD

3

F

3

W60812

(SHEET 7 OF 8)
 FIGURE 6: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 1, 3, 5, 6, 7, and 8 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

NOTE: On Group 8 airplanes, only the cutouts for Main Entry Door 1 left and right are affected.

NOTE: Inspection of the skin will require removal of the scuff plates and thresholds.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Main Entry Door No. 1 

Cutout Area

Detailed - (a)

2 Inspect Main Entry Door No. 1 

Cutout Area

Detailed - (b)

3 Inspect Main Entry Door 

Cutouts (except Main 

Entry Door No. 1)

Detailed - (c)

(a) Do internal and external detailed inspection of the main entry door No. 1 cutout area below the 

upper deck. The inspection area is from the lower chord of the upper deck floor beam to the lower 

auxiliary sill, and between STA 400 and STA 500. Inspect both sides of the frames in this area. 

Inspect the upper main sill outer chord, web and inner chord. Pay special attention to the stringer 

cutouts and the inner chords of the frames.

(b) Do internal and external detailed inspection of the main entry door No. 1 cutout area above the 

upper deck. The inspection area is from the upper chords of the upper deck floor beams to 

Stringer 8, between STA 400 and STA 500. Inspect both sides of the frames in this area. Pay 

special attention to the stringer cutouts and the inner chords of the frames.

(c) Do internal and external detailed inspections of the main entry door cutouts. The inspection area is 

from the upper auxiliary sill to the lower auxiliary sill, one frame forward and aft of the door edge 

frames. Inspect both sides of the frames in this area. Inspect the upper main sill outer chord, web 

and inner chord. Pay special attention to the stringer cutouts and the inner chords of the frames.

Related Service Bulletins

Door Service Bulletin Subject

1, 2, 3, 

and 4

747-53-2358 Fuselage - Main Entry Doors Number 1, 2, 3, and 4 - Forward Edge Stop Support 

Fitting Inspection and Replacement

1 747-53A2396 Fuselage - Skins - Skin and Internal Doubler Inspection, Repair, and Modification 

Above Main Entry Door 1 at Station 460

1 747-53A2414 Fuselage - Main Entry Door 1 Cutout - Door Frame Aft Edge at Station 488 - 

Inspection and Repair

4 747-53A2416 Fuselage - Center Section - Body Station 1265 Frame Inspection, Repair, and 

Modification

1 747-53A2417 Fuselage - Main Entry Door Number 1 Cutout - Door Frame Forward Edge at 

Station 434 - Inspection and Repair

5 747-53A2450 Fuselage - Section 46 - Body Station 2231 Frame Inspection - Stringers 23 

through 31

2 747-53A2451 Fuselage - Section 42 - Door Number 2 Forward Edge Frame at Body Station 800 

- Inspection and Repair

3 747-53A2512 Fuselage - Main Entry Door Number 3 Cutout - Lower Forward Corner and Upper 

Aft Corner - Inspection and Repair at Left and Right Side Skin and Bearstrap.

(SHEET 8 OF 8)
 FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

400

CANTED

260

STA

340

STA

STA

140

STA

520

STA

340

STA

400

STA

BL

0

A

C

C

B

B

A

4

FWD

SEE A

SEE B

W60833

(SHEET 1 OF 10)
 FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

TYPICAL

CRACK

CRACK

TYPICAL

LEFT SIDE

FLOOR BEAM

BEAM WEB

VERTICAL

FLOOR BEAM

BEAM WEB

VERTICAL

FLOOR BEAM

STA 380

OR 360

BL 0

STA 380

OR 360

STA 380

OR 360

RIGHT SIDE SHOWN

LEFT SIDE OPPOSITE

LEFT SIDE SHOWN

RIGHT SIDE OPPOSITE

5

5

FWD INBD

UP

A

INBD

UP

FWD

INBD

FWD

UP

SEE C

B C

W60840

(SHEET 2 OF 10)
 FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

CHORD

CRACKS

BEAM

FLOOR

CRACKS

WEB

INNER

CHORD

CRACK

TYPICAL CRACK LOCATIONS

STA 260 FORWARD CANTED BULKHEAD

A-A

MAIN DECK

FLOOR

S-22L S-22R

WEB AND WEB CRACKS

DOUBLER

CRACKS

INTERSECTION

SIDEWALL

BULKHEAD/

WEB

CRACKS

WEB

CRACKS WEB

RBL CRACKS

30.00 30.00

LBL

LOWER CHORD CRACKS

SEE E

SEE D

1

W60861

(SHEET 3 OF 10)
 FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

WEB CRACKS

BROKEN STRAP

TYPICAL WEB AND INNER

CHORD STRAP CRACKS

S-36

S-34

S-32A

S-31A

S-39

S-38

INBD

UP

D

W60866

(SHEET 4 OF 10)
 FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

WEB CRACKS

TYPICAL

(LEFT SIDE OPPOSITE)

RIGHT SIDE SHOWN

RBL RBL

30.00 40.00

E

W60869

(SHEET 5 OF 10)
 FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

B-B

TYPICAL STA 340 BULKHEAD CRACK LOCATIONS

S-22L S-22R

CRACKS

DOUBLER

WEB AND

WEB

CRACK

WEB

FLOOR

DECK

MAIN FLOOR BEAM

BL CHORD CRACK

0

CHORD CRACK

FLOOR BEAM

CRACKS

CLIP

CRACK

F

2

SEE

W60879

(SHEET 6 OF 10)
 FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

December 21, 2004

Revision 1: September 25, 2008 747-53A2500

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ALERT ALERT

CRACKS

STRINGER CUTOUT

CHORD CRACKS

FLOOR BEAM

MAIN DECK

CRACKS

WEB

S-23

WEB

CRACKS

SHEAR TIE

CRACKS

S-24A

INBD

UP

F

W60891

(SHEET 7 OF 10)
 FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

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ALERT ALERT

CHORD CRACKS STIFFENER CRACKS

BULKHEAD CRACKS

TYPICAL STA 400

C-C

IN THIS AREA, IT IS ACCEPTABLE

FORWARD SIDE ONLY.

TO DO THE INSPECTION FROM THE

S-22L S-22R

CRACKS

MAIN DECK

FLOOR

0

BL WEB

CRACK

STIFFENER

WEB AND

WEB CRACKS

3

SEE G

W60893

(SHEET 8 OF 10)
 FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

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ALERT ALERT

WEB CRACKS

S-23L

TYPICAL STA 400 BULKHEAD

STRINGER CUTOUT CRACK

UP

INBD

G

W60930

(SHEET 9 OF 10)
 FIGURE 7: INSPECTION OF AREA 7 - BODY STATION 260, 340, AND 400 BULKHEADS AND NOSE 

WHEEL WELL SIDEWALLS FROM STATION 340 TO STATION 400

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ALERT ALERT

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. 

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect STA 260 Bulkhead Detailed - (a)

2 Inspect STA 340 Bulkhead Detailed - (a)

3 Inspect STA 400 Bulkhead Detailed - (a)

4 Inspect Sidewall Panel Web and 

Stiffeners

Detailed - -

NOTE:

1. From STA 340 to STA 400, from the intersection with the top panel to the intersection 

with the body skin, on both the left and right sides.

2. In the area of the torque box, do the inspection from inside the wheel well.

3. Also inspect the intersection of the sidewall panel with the STA 340 and STA 400 

bulkheads.

5 Inspect Floor Beam Lower Chord Detailed - (b)

Floor Beam Web

Vertical Beam Web

(a) Inspect both the forward and aft sides of the entire bulkhead, from S-22L to S-22R, from both 

inside the airplane and inside the wheel well. Be sure to inspect the intersections between the 

bulkhead and nose wheel well sidewall panels.

(b) Do detailed inspections of the STA 360 and STA 380 main deck floor beam lower chords, floor 

beam webs, and vertical beam webs within 12 inches of each intersection of the floor beam and 

vertical beam, on both the left and right sides. If cracks are found, repair before any more flights. 

Ask Boeing for repair data.

(SHEET 10 OF 10)
 FIGURE 8: INSPECTION OF AREA 8 - MAIN ENTRY DOORS - GROUP 1, 3, 5, 6, 7, 8, AND 10 AIRPLANES

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ALERT ALERT

FIGURE 8: INSPECTION OF AREA 8 - MAIN ENTRY DOORS - GROUP 1, 3, 5, 6, 7, 8, AND 10 AIRPLANES

ENTRY DOOR

NO. 3 MAIN

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

ENTRY DOOR

NO. 1 MAIN

ENTRY DOOR

NO. 2 MAIN

ENTRY DOOR

NO. 5 MAIN

ENTRY DOOR

NO. 4 MAIN

1

SEE A

1

SEE A

1

SEE A

1

SEE A

1

SEE A

W60934

(SHEET 1 OF 3)
 FIGURE 8: INSPECTION OF AREA 8 - MAIN ENTRY DOORS - GROUP 1, 3, 5, 6, 7, 8, AND 10 AIRPLANES

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ALERT ALERT

(TYPICAL)

DOOR STOP

(OTHER DOORS SIMILAR)

NO. 2 AND NO. 4 MAIN ENTRY DOOR SHOWN

UPPER GATE

ASSEMBLY

(TYPICAL)

FRAME 

LOWER GATE

ASSEMBLY

(TYPICAL)

BUILT-UP BEAM

DOOR SKIN

(TYPICAL)

FRAME (CLOSURE BEAM)

SEE B

INBD

FWD

A

1

W60946

(SHEET 2 OF 3)
 FIGURE 8: INSPECTION OF AREA 8 - MAIN ENTRY DOORS - GROUP 1, 3, 5, 6, 7, 8, AND 10 AIRPLANES

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ALERT ALERT

This Figure applies to Group 1, 3, 5-8, 10: 

The step number shown below agrees with the number shown in the circle symbols in the figure. 

NOTE: On Group 8 airplanes, only Main Entry Door 1 left and right are affected.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Main Entry Door 

Structure

Detailed - (a)

(a) Do internal and external inspections of the door structure.

FILLET CRACK

FLANGE CRACK

CRACK

PIN HOLE

TYPICAL DOOR STOP CRACKS

B

W60955

(SHEET 3 OF 3)
 FIGURE 9: INSPECTION OF AREA 9 - MAIN ELECTRONICS BAY ACCESS DOOR CUTOUT

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ALERT ALERT

FIGURE 9: INSPECTION OF AREA 9 - MAIN ELECTRONICS BAY ACCESS DOOR CUTOUT

TYPICAL

400

STA

BAY ACCESS DOOR

MAIN ELECTRONICS

FUSELAGE SKIN

INSPECTION AREA

(TYPICAL 4 LOCATIONS)

440

STA

CRACK

BAY ACCESS DOOR

MAIN ELECTRONICS

420

STA

1

UP

FWD

W60958

(SHEET 1 OF 2)
 FIGURE 9: INSPECTION OF AREA 9 - MAIN ELECTRONICS BAY ACCESS DOOR CUTOUT

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ALERT ALERT

The step number shown below agrees with the number shown in the circle symbol in the figure. 

NOTE: The Main Electronics Bay Access Door should be open for the inspection.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Fuselage Skin Detailed - (a)

(a) Internal and external, at all four corners of the door cutout, for cracks.

(SHEET 2 OF 2)
 FIGURE 10: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 2 AND 9 AIRPLANES

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ALERT ALERT

FIGURE 10: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 2 AND 9 AIRPLANES

270

(TYPICAL)

FLOOR BEAMS

ALL UPPER DECK

740

STA

540

STA

287

STA

STA

300

STA

320

STA

330

STA

340

STA

360

STA

380

STA

400

STA

STA 240 TO STA 400

FWD

UP

SEE A B C

SEE D

A

1

382860

(SHEET 1 OF 5)
 FIGURE 10: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 2 AND 9 AIRPLANES

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ALERT ALERT

520

STA

500

STA

480

STA

460

STA

440

STA

420

STA

400

STA

LEFT SIDE - STA 400 TO STA 520

B

FWD

UP

383134

(SHEET 2 OF 5)
 FIGURE 10: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 2 AND 9 AIRPLANES

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ALERT ALERT

400

STA

520

STA

420

STA 440

STA 460

STA

480

STA 500

STA 0

BL

RIGHT SIDE - STA 400 TO STA 520

FWD

UP

C

383395

(SHEET 3 OF 5)
 FIGURE 10: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 2 AND 9 AIRPLANES

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ALERT ALERT

720

STA

700

STA

680

STA

640

STA

580

STA

560

STA

540

STA

0

BL

740

STA

660

STA

620

STA

600

STA

D

FWD

UP

384088

LEFT SIDE SHOWN

RIGHT SIDE OPPOSITE

(SHEET 4 OF 5)
 FIGURE 10: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 2 AND 9 AIRPLANES

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ALERT ALERT

This Figure applies to Group 2, 9: 

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. 

NOTE:

1. Boeing Service Bulletins 747-53A2420, 747-53A2429, and 747-53A2439 give instructions for 

NDT inspections of the upper deck floor beams on Group 2 and 9 airplanes.

2. If necessary, loosen and remove air conditioning ducts for access to the inspection area.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Upper Chord Detailed - From below the floor 

Web beams (a)

Lower Chord

(a) The inspection area is from STA 260 to STA 740. Pay particular attention to all nutplate locations, 

cutout locations, and to the floor beam connections to the frames. Also inspect the cab floor web (in 

the plane of the floor) from STA 260 to STA 330. Pay particular attention to all cutouts and nutplate 

locations.

NOTE: At STA 260, inspect the chord that is common to the cab floor web. Also inspect the

adjacent 2 inches of the vertical web.

(SHEET 5 OF 5)
 FIGURE 11: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 3 AND 10 AIRPLANES

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ALERT ALERT

FIGURE 11: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 3 AND 10 AIRPLANES

270

STA

780

STA

540

287

STA

STA

300

STA

320

STA

330

STA

340

STA

360

STA

380

STA

400

STA

(TYPICAL)

FLOOR BEAMS

ALL UPPER DECK

STA 240 TO STA 400

UP

FWD

SEE A B C

SEE D

A

1

384097

(SHEET 1 OF 5)
 FIGURE 11: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 3 AND 10 AIRPLANES

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ALERT ALERT

520

STA

500

STA

480

STA

460

STA

440

STA

420

STA

400

STA

LEFT SIDE - STA 400 TO STA 520

B

FWD

UP

384158

(SHEET 2 OF 5)
 FIGURE 11: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 3 AND 10 AIRPLANES

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ALERT ALERT

400

STA

520

STA

420

STA 440

STA 460

STA

480

STA 500

STA 0

BL

RIGHT SIDE - STA 400 TO STA 520

FWD

UP

C

385297

(SHEET 3 OF 5)
 FIGURE 11: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 3 AND 10 AIRPLANES

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ALERT ALERT

720

STA

700

STA

680

STA

640

STA

580

STA

560

STA

540

STA

0

BL

740

STA

660

STA

620

STA

600

STA

780

STA

D

FWD

UP

384368

LEFT SIDE SHOWN

RIGHT SIDE OPPOSITE

(SHEET 4 OF 5)
 FIGURE 11: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 3 AND 10 AIRPLANES

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

This Figure applies to Group 3, 10: 

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. 

NOTE:

1. Boeing Service Bulletins 747-53A2420, 747-53A2429, and 747-53A2439 give instructions for 

NDT inspections of the upper deck floor beams on Group 3 and 10 airplanes.

2. If necessary, loosen and remove air conditioning ducts for access to the inspection area.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Upper Chord Detailed - From below the floor 

Web beams (a)

Lower Chord

(a) The inspection area is from STA 260 to STA 780. Pay particular attention to all nutplate locations, 

cutout locations, and to the floor beam connections to the frames. Also inspect the cab floor web (in 

the plane of the floor) from STA 260 to STA 330. Pay particular attention to all cutouts and nutplate 

locations.

NOTE: At STA 260, inspect the chord that is common to the cab floor web. Also inspect the

adjacent 2 inches of the vertical web.

(SHEET 5 OF 5)
 FIGURE 12: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 4 AIRPLANES

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ALERT ALERT

FIGURE 12: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 4 AIRPLANES

(TYPICAL)

FLOOR BEAMS

ALL UPPER DECK

1

SEE E

SEE A B C D

STA

140

STA

520

384396

(SHEET 1 OF 4)
 FIGURE 12: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 4 AIRPLANES

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ALERT ALERT

400

80

LBL

60

LBL

40

LBL

20

LBL

0

BL 400

STA

380

STA

360

STA

340

STA

330

STA

320

STA

302

STA

287

STA

270

STA

LEFT SIDE FLOOR BEAMS

BL

STA

0

380

STA

360

STA

340

STA

330

STA

320

STA

STA

302

287

STA

270

STA

RIGHT SIDE FLOOR BEAMS

30

RBL

50

RBL

70

RBL

90

RBL

FWD

UP

A

B

FWD

UP

384408

(SHEET 2 OF 4)
 FIGURE 12: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 4 AIRPLANES

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ALERT ALERT

FWD

UP

LBL

46.83

60

LBL

LBL

100

80

LBL

LBL

LBL

86

28

24.17

LBL

BL

0

520

STA

500

STA

STA

480

460

STA

440

STA

420

STA

C

D

FWD

UP

RIGHT SIDE FLOOR BEAMS

384939

LEFT SIDE FLOOR BEAMS

STA

500

480

STA

460

STA

440

STA

420

STA

RBL

12.49

54.0

RBL

48.83

RBL

520

STA

(SHEET 3 OF 4)
 FIGURE 12: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 4 AIRPLANES

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ALERT ALERT

This Figure applies to Group 4: 

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. 

NOTE: If necessary, loosen and remove air conditioning ducts for access to the inspection area.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Upper Chord Detailed - From below the floor 

Web beams (a)

Lower Chord

(a) The inspection area is from STA 260 to STA 700. Pay particular attention to all nutplate locations, 

cutout locations, and to the floor beam connections to the frames. Also inspect the cab floor web (in 

the plane of the floor) from STA 260 to STA 330. Pay particular attention to all cutouts and nutplate 

locations.

NOTE: At STA 260, inspect the chord that is common to the cab floor web. Also inspect the

adjacent 2 inches of the vertical web.

E

FWD

UP

384946

LBL 20

BL 0

LBL 40

LBL 60

RIGHT SIDE OPPOSITE

LEFT SIDE SHOWN,

LBL 80

LBL 100 540

STA

560

STA

580

STA

600

STA

620

STA

640

STA

700

STA

680

STA

660

STA

(SHEET 4 OF 4)
 FIGURE 13: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 2, 3, 4, 9, AND 

10 AIRPLANES

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ALERT ALERT

FIGURE 13: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 2, 3, 4, 9, AND 10 

AIRPLANES

540

STA

720

STA

S-0

980

STA

S-12A

S-26

S-40

SEE A

SEE B

SEE D

SEE C

384047

(SHEET 1 OF 6)
 FIGURE 13: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 2, 3, 4, 9, AND 

10 AIRPLANES

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ALERT ALERT

S-0L

720

STA 700

STA 680

STA 660

STA 640

STA 620

STA 600

STA 580

STA 560

STA 540

STA

S-1L

S-2L

S-2AL

S-3L

S-3AL

S-4L

S-5L

S-6L

S-7L

S-8L

S-9L

S-10L

S-10AL

S-11L

S-12L

LEFT SIDE SHOWN

TIES NOT SHOWN FOR CLARITY

UPPER DECK FOOR BEAMS AND TENSION

RIGHT SIDE OPPOSITE

FWD

1

A

384082

(SHEET 2 OF 6)
 FIGURE 13: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 2, 3, 4, 9, AND 

10 AIRPLANES

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ALERT ALERT

CLARITY

FLOOR BEAMS NOT SHOWN FOR

RIGHT SIDE OPPOSITE

LEFT SIDE SHOWN

540

STA

560

STA

580

STA

600

STA

640

STA

660

STA

680

STA

700

STA

620

STA

720

STA

S-20

S-19

S-18

S-17

S-16

S-15

S-14

S-13

S-26

S-25

S-24

S-23

S-22

FWD

1

B

384170

(SHEET 3 OF 6)
 FIGURE 13: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 2, 3, 4, 9, AND 

10 AIRPLANES

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ALERT ALERT

SHOWN FOR CLARITY

AND TENSION TIES NOT

UPPER DECK FLOOR BEAMS

RIGHT SIDE OPPOSITE

LEFT SIDE SHOWN

STA740 STA

760 STA

780 STA

800 STA

820 STA

840 STA

860 STA

880 STA

900 STA

920 STA

940 STA

960 STA

980

S-0

S-1

S-2

S-2A

S-3

S-3A

S-4

S-6

S-5

S-7

S-8

S-9

S-10

S-10A

S-11

S-12

C

1

384324

FWD

(SHEET 4 OF 6)
 FIGURE 13: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 2, 3, 4, 9, AND 

10 AIRPLANES

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ALERT ALERT

NOT SHOWN FOR CLARITY

UPPER DECK FLOOR BEAMS

RIGHT SIDE OPPOSITE

LEFT SIDE SHOWN

S-25

S-24

S-26

S-23

S-22

S-17

S-18

S-19

S-20

S-13

S-14

S-15

S-16

800

STA 780

STA 760

STA

740

STA

920

STA 900

STA 880

STA 860

STA 840

STA 820

STA

980

STA 960

STA 940

STA

D

384339

FWD

(SHEET 5 OF 6)
 FIGURE 13: INSPECTION OF AREA 2 - SECTION 42 UPPER LOBE FRAMES - GROUP 2, 3, 4, 9, AND 

10 AIRPLANES

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

This Figure applies to Group 2-4, 9-10: 

The step number shown below agrees with the number shown in the circle symbols in the figure. 

NOTE: The STA 520 frame and the STA 1000 bulkhead are not shown.

NOTE: If necessary, loosen and remove air conditioning ducts for access to the area to be inspected.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Upper Lobe Frames Detailed - (a)

(a) The inspection area is from STA 520 to STA 1000, from the main deck floor to the top of the crown.

(SHEET 6 OF 6)
 FIGURE 14: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 2 and 4 AIRPLANES

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ALERT ALERT

FIGURE 14: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 2 and 4 AIRPLANES

ENTRY DOOR

NO. 1 MAIN

SEE C

SEE A

SEE B

NO. 5 MAIN ENTRY DOOR

STA

2360

STA

1961.10

STA

1000

STA

1480

STA

520

384963

(SHEET 1 OF 5)
 FIGURE 14: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 2 and 4 AIRPLANES

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ALERT ALERT

MAIN ENTRY DOOR NO. 1

LEFT SIDE ONLY

STA

520

STA

500

420

STA

400

STA

LOWER MAIN SILL

UPPER MAIN SILL

FORWARD FRAME

S-22

S-23

S-24

S-26

S-27

S-28

S-30

S-20

S-19

S-18

S-17

S-16

S-15

S-14

S-13

AFT FRAME

REVEAL

ASSEMBLY

STA

480

STA

460

STA

440

LOWER

AUXILLIARY SILL

UPPER DECK FLOOR BEAM

LOWER CHORDS

FWD

A

1

384983

(SHEET 2 OF 5)
 FIGURE 14: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 2 and 4 AIRPLANES

December 21, 2004

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ALERT ALERT

S-3

S-3A

S-4

S-6

S-5

S-8

S-9

S-10

S-10A

S-11

S-12

S-7A

S-7

STA

400 STA

420 STA

440

STA

460

STA

480

STA

500

STA

520

FWD

2

B

LEFT SIDE ONLY

1559250

(SHEET 3 OF 5)
 FIGURE 14: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 2 and 4 AIRPLANES

December 21, 2004

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ALERT ALERT

This Figure applies to Group 2, 4: 

MAIN ENTRY DOOR NO. 5

LEFT SIDE ONLY

S-20

S-22

2280

STA

S-27

S-24

S-19

S-17

S-14

S-13

2240

STA

2260

STA

2280

STA

2200

STA

2220

STA

2240

STA

2260

STA

STA

2300

2220

STA

UPPER SILL

LOWER AUXILIARY SILL

LOWER

SILL

UPPER AUXILIARY

SILL

THRESHOLD

FWD

C

3

3

384996

(SHEET 4 OF 5)
 FIGURE 14: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 2 and 4 AIRPLANES

December 21, 2004

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ALERT ALERT

The step number shown below agrees with the number shown in the circle symbols in the figure. 

NOTE: Inspection of the skin will require removal of the scuff plates and thresholds.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Main Entry Door 

No. 1 Cutout Area

Detailed - (a)

2 Inspect Main Entry Door 

No. 1 Cutout Area

Detailed - (b)

3 Inspect Main Entry Door 

Cutouts (except 

Main Entry Door 

No. 1)

Detailed - (c)

(a) Do internal and external detailed inspection of the main entry door No. 1 cutout area below the 

upper deck. The inspection area is from the lower chord of the upper deck floor beam to the lower 

auxiliary sill, and between STA 400 and STA 500. Inspect both sides of the frames in this area. 

Inspect the upper main sill outer chord, web and inner chord. Pay special attention to the stringer 

cutouts and the inner chords of the frames.

(b) Do internal and external detailed inspection of the main entry door No. 1 cutout area above the 

upper deck. The inspection area is from the upper chords of the upper deck floor beams to Stringer 

8, between STA 400 and STA 500. Inspect both sides of the frames in this area. Pay special 

attention to the stringer cutouts and the inner chords of the frames.

(c) Do internal and external detailed inspections of the main entry door cutouts. The inspection area is 

from the upper auxiliary sill to the lower auxiliary sill, one frame forward and aft of the door edge 

frames. Inspect both sides of the frames in this area. Inspect the upper main sill outer chord, web 

and inner chord. Pay special attention to the stringer cutouts and the inner chords of the frames.

(SHEET 5 OF 5)
 FIGURE 15: INSPECTION OF AREA 8 - MAIN ENTRY DOORS - GROUP 2, 4, AND 9 AIRPLANES

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ALERT ALERT

FIGURE 15: INSPECTION OF AREA 8 - MAIN ENTRY DOORS - GROUP 2, 4, AND 9 AIRPLANES

SEE A

SEE A

NO. 1 MAIN ENTRY DOOR

385013

NO. 5 MAIN ENTRY DOOR

2360

STA

1961.10

STA

1000

STA

1480

STA

520

STA

(SHEET 1 OF 3)
 FIGURE 15: INSPECTION OF AREA 8 - MAIN ENTRY DOORS - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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ALERT ALERT

(TYPICAL)

DOOR STOP

TYPICAL MAIN ENTRY DOOR

UPPER GATE

ASSEMBLY

(TYPICAL)

FRAME

LOWER GATE

ASSEMBLY

(TYPICAL)

BUILT-UP BEAM

DOOR SKIN

(TYPICAL)

FRAME (CLOSURE BEAM)

SEE B

INBD

FWD

A

1

385016

(SHEET 2 OF 3)
 FIGURE 15: INSPECTION OF AREA 8 - MAIN ENTRY DOORS - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

This Figure applies to Group 2, 4, 9: 

The step number shown below agrees with the number shown in the circle symbols in the figure. 

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Main Entry Door 

Structure

Detailed - (a)

(a) Do internal and external inspections of the door structure.

FILLET CRACK

FLANGE CRACK

CRACK

PIN HOLE

TYPICAL DOOR STOP CRACKS

B

385019

(SHEET 3 OF 3)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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ALERT ALERT

FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 

AIRPLANES

STA

STA

2160

1500

STA

STA

1720

STA

1980

S-0

2360

SEE I J AND K

SEE C D E AND F

SEE G AND H

SEE A AND B

W60030

(SHEET 1 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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ALERT ALERT

S-12

STA

1640

1660

STA

1680

STA

STA

1700

1720

STA

STA S-5

S-7

STA 1560

1580

1600

STA

STA

1620

S-6

1500

STA

1520

STA

1540

STA

S-11

S-10

S-9

S-4

S-8

S-3

S-2

S-1

LEFT SIDE SHOWN

RIGHT SIDE OPPOSITE

FWD

1

A

423887

(SHEET 2 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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ALERT ALERT

STA

STA

LEFT SIDE SHOWN

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS

RIGHT SIDE OPPOSITE

1560

STA

1500

1520 STA

1540

1620 STA

STA 1640

STA

1720

STA

1700

STA

1680

1660

STA

1580

STA

STA

1600

FWD

B

1

423892

S-26

S-25

S-13

S-14

S-15

S-16

S-17

S-18

S-19

S-20

S-21

S-22

S-23

S-24

(SHEET 3 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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ALERT ALERT

LEFT SIDE

STA

1960

1880

STA

1980

STA

1800

STA

1920

STA

1940

STA

S-7

S-6

S-5

S-2

S-3

S-1

S-4

S-8

S-9

S-10

S-11

S-12

1860

STA

1800

STA 1760

STA

STA

1740

1840

STA 1820

STA

STA

1780

FWD

C

1

423898

(SHEET 4 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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ALERT ALERT

STA

1740 1780

STA

1820

STA

1860

STA STA

1900

1940

STA

1980

STA

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS

LEFT SIDE

S-34

S-29

S-27

S-20

S-17

S-15

S-13

S-11

S-7

S-5

S-9

S-22

S-25

FWD

1

D

423906

(SHEET 5 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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ALERT ALERT

STA

1780

S-12

RIGHT SIDE

STA

1980

S-10

S-1

S-2

S-9

S-8

S-7

S-6

S-4

S-5

S-3

1740 STA

1760

1800

STA

STA

1820

1840

STA

1860

STA

1880

STA

STA

1900

1940

STA

STA

1920

S-11

STA

STA

1960

1

FWD

E

423949

(SHEET 6 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

1740

STA

1940

STA

STA

1960 STA

1980

S-15

S-26

S-25

S-20

S-19

S-18

S-17

S-16

S-14

S-13

1760

STA

1780

STA

1800

STA

1820

STA

1840

STA

1860

STA

1880

STA

1900

STA

STA

S-24

S-23

S-22

S-21

1920

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS

RIGHT SIDE

1

FWD

F

423953

(SHEET 7 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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ALERT ALERT

S-2

2160

STA

2120

STA

STA

2080

2040

STA

S-12

S-11

S-10

S-9

S-8

S-7

S-6

S-5

S-4

S-3

2000

STA

S-1

LEFT SIDE SHOWN, RIGHT SIDE OPPOSITE

FWD

1

G

423978

(SHEET 8 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

LEFT SIDE SHOWN

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS

RIGHT SIDE OPPOSITE

S-26

S-17

S-18

S-19

S-20

S-21

S-22

S-23

S-24

S-25

S-13

S-14

S-15

S-16

STA

2160

STA

2140

STA

2120

2100

STA 2080

STA

2060

STA

2040

STA

STA

2020

STA

2000

1

FWD

H

423996

(SHEET 9 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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ALERT ALERT

LEFT SIDE SHOWN

RIGHT SIDE OPPOSITE

STA

2320

2300

STA

STA

2360

2340

STA

S-1

S-2

S-3

S-4

S-5

S-6

S-7

S-8

S-9

S-10

S-11

STA

2260

STA

2240

2220

STA 2200

STA

STA

2180

STA

2280

FWD

I

1

424019

(SHEET 10 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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ALERT ALERT

2340

STA

STA

2360

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS

LEFT SIDE

STA

2300

STA

2320

S-13

S-14

S-15

S-16

S-17

S-18

S-19

S-20

S-21

S-22

S-23

S-24

S-25

S-26

2260

STA

2240

STA

2200

STA

2220

STA

STA

2180

STA

2280

FWD

1

J

424021

(SHEET 11 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS

RIGHT SIDE

S-13

S-14

S-15

S-16

S-17

S-18

S-19

S-20

S-21

S-22

S-23

S-24

S-25

S-26

STA

2180 STA

2200

STA

2240

STA

2220

STA

2260 STA

2280 STA

2300 STA

2320 STA

2340 STA

2360

FWD

K

1

424029

(SHEET 12 OF 13)
 FIGURE 16: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 2, 4, AND 9 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

This Figure applies to Group 2, 4, 9: 

The step number shown below agrees with the number shown in the circle symbols in the figure. 

NOTE: The STA 1480 bulkhead is not shown.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Upper Lobe Frames Detailed - (a) (b)

(a) The inspection area is from STA 1480 to STA 2360, from the main deck floor to the top of the crown.

(b) Pay particular attention to frame inner chords at the last fastener in a reinforcing strap, frame webs, 

fail-safe chords, and stringer cutouts.

(SHEET 13 OF 13)
 FIGURE 17: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 3, 6, 7, AND 10 

AIRPLANES

December 21, 2004

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ALERT ALERT

FIGURE 17: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 3, 6, 7, AND 10 

AIRPLANES

STA

STA

2160

1500

STA

STA

1720

STA

1980

S-0

2360

SEE F

SEE B C AND D

SEE E

SEE A

480379

(SHEET 1 OF 8)
 FIGURE 17: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 3, 6, 7, AND 10 

AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

S-26

S-24

S-23

S-27

S-28

S-32

S-33

S-34

S-35

S-36

S-37

S-38

S-39

1700

STA

1660

STA

1620

STA

1580

STA

1540

STA

1500

STA

1520

STA

1560

STA

1600

STA

1640

STA

1680

STA

1720

STA

S-11

S-12

S-13

S-14

S-15

S-16

S-17

S-18

S-19

S-25

S-1

S-2

S-3

S-4

S-5

S-6

S-7

S-8

S-9

S-10

S-20

S-22

S-29

S-30

S-31

POSTS NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS AND

1

A

FWD

480380

(SHEET 2 OF 8)
 FIGURE 17: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 3, 6, 7, AND 10 

AIRPLANES

December 21, 2004

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ALERT ALERT

LEFT SIDE

STA

1960

1880

STA

1980

STA

1800

STA

1920

STA

1940

STA

S-7

S-6

S-5

S-2

S-3

S-1

S-4

S-8

S-9

S-10

S-11

S-12

1860

STA

1800

STA 1760

STA

STA

1740

1840

STA 1820

STA

STA

1780

FWD

B

1

480383

(SHEET 3 OF 8)
 FIGURE 17: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 3, 6, 7, AND 10 

AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

STA

1740 1780

STA

1820

STA

1860

STA STA

1900

1940

STA

1980

STA

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS

LEFT SIDE

S-34

S-29

S-27

S-20

S-17

S-15

S-13

S-11

S-7

S-5

S-9

S-22

S-25

FWD

1

C

480394

(SHEET 4 OF 8)
 FIGURE 17: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 3, 6, 7, AND 10 

AIRPLANES

December 21, 2004

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ALERT ALERT

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS AND POSTS

RIGHT SIDE

S38

S36

S31

S24 S23

S16

S18

S20

S17

S15

S6

S8

S10

S14

S12

S4

S2

S39

S37

S35

S33

S32

S30

S29 S28

S27

S19

S13

S11

S9

S7

S5

S3

S1

STA

1940 1900

STA

1860

STA

1820

STA

1780

STA STA

1740

1920

STA

1880

STA

1840

STA

1800

STA

1760

STA

1980

STA 1960

STA

D

FWD

1

480398

(SHEET 5 OF 8)
 FIGURE 17: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 3, 6, 7, AND 10 

AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS AND POSTS

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

S-8

S-6

S-4

S-1 S-2

S-3

S-5

S-7

S-9

S-10

S-20

S-11

S-12

S-13

S-14

S-15

S-16

S-18

S-19

S-22

S-23

S-24 S-25

S-26

S-27

S-28

S-29

S-30

S-31

S-32

S-33

S-34

S-35

S-36

S-38

S-39

S-37

STA

2040

STA

2000

STA

2020

STA

2060

2140

STA

STA

2100

STA

2120

STA

2080

STA

2160

S-17

FWD

1

E

480410

(SHEET 6 OF 8)
 FIGURE 17: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 3, 6, 7, AND 10 

AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

NOT SHOWN FOR CLARITY

MAIN DECK FLOOR BEAMS

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

S-25

S-24

S-23

S-22

S-20

S-19

S-18

S-17

S-16

S-15

S-14

S-13

S-12

S-11

S-10

S-9

S-4

S-5

S-6

S-3

S-2

S-7

S-8

S-1

STA

2180 STA

2200 STA

2220 STA

2240 STA

2260 STA

2280 STA

2300 STA

2320

2340

STA

2360

STA

S-26

FWD

F

1

480412

(SHEET 7 OF 8)
 FIGURE 17: INSPECTION OF AREA 5 - SECTION 46 UPPER LOBE FRAMES - GROUP 3, 6, 7, AND 10 

AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

This Figure applies to Group 3, 6-7, 10: 

The step number shown below agrees with the number shown in the circle symbols in the figure. 

NOTE: The STA 1480 bulkhead is not shown.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Upper Lobe Frames Detailed - (a) (b)

(a) The inspection area is from STA 1480 to STA 2360, from the main deck floor to the top of the crown.

(b) Pay particular attention to frame inner chords at the last fastener in a reinforcing strap, frame webs, 

fail-safe chords, and stringer cutouts.

(SHEET 8 OF 8)
 FIGURE 18: INSPECTION OF AREA 1 - FRAME INSPECTION COMMON TO UPPER DECK FLOOR 

BEAMS

December 21, 2004

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ALERT ALERT

FIGURE 18: INSPECTION OF AREA 1 - FRAME INSPECTION COMMON TO UPPER DECK FLOOR 

BEAMS

STA

260

UPPER DECK FLOOR BEAM AREA

(STA. 260 - STA. 520)

STA

520

STA

340

A

A

1556269

(SHEET 1 OF 3)
 FIGURE 18: INSPECTION OF AREA 1 - FRAME INSPECTION COMMON TO UPPER DECK FLOOR 

BEAMS

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ALERT ALERT

UPPER DECK FLOOR

BEAM UPPER CHORD

S-11

S-13A

FRAME INNER

CHORD

FRAME OUTER

CHORD

LEFT SIDE SHOWN, RIGHT SIDE SIMILAR

UPPER DECK FLOOR

BEAM WEB

UPPER DECK FLOOR

BEAM LOWER CHORD

STA 340 INSPECTION AREA SHOWN, 

ALL OTHER INSPECTION AREAS 

(STA 260 - STA 520) SIMILAR

FRAME WEB

UP

INBD

A-A

1

1556271

(SHEET 2 OF 3)
 FIGURE 18: INSPECTION OF AREA 1 - FRAME INSPECTION COMMON TO UPPER DECK FLOOR 

BEAMS

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ALERT ALERT

The step numbers shown below agree with the numbers shown in the circle symbols in the figure.

STEP TASK NAME IDENTIFICATION QTY MORE DATA

1 Inspect Detailed - - (a) (b) (c)

(a) Do a detailed inspection for cracks in the frame inner chord, the frame outer chord, frame web, and 

any angles, straps, or doublers in the area shown. Do this detailed inspection on both sides of the frame 

(forward and aft). Do this detailed inspection on all frames from STA 260 to STA 520, and on both the 

right side and left side of the airplane.

(b) If there is a repair in the frame inspection area, it is acceptable to inspect the repaired area. However, 

at least one side of the frame chords must be fully visible.

(c) It is optional to do a borescope inspection in areas where access is limited.

(SHEET 3 OF 3)
 FIGURE 19: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 9 AIRPLANES

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ALERT ALERT

FIGURE 19: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 9 AIRPLANES

SEE A

SEE B

NO. 1 MAIN ENTRY DOOR

NO. 5 MAIN ENTRY DOOR

STA

2360

STA

1961.10

STA

1000

STA

1480

STA

520

1572878

(SHEET 1 OF 4)
 FIGURE 19: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 9 AIRPLANES

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ALERT ALERT

STA

520

STA

500

420

STA

400

STA

(RIGHT SIDE OPPOSITE)

MAIN ENTRY DOOR NO. 1

LEFT SIDE SHOWN

LOWER MAIN SILL

UPPER MAIN SILL

FORWARD FRAME

S-22

S-23

S-24

S-26

S-27

S-28

S-30

S-20

S-19

S-18

S-17

S-16

S-15

S-14

S-13

AFT FRAME

REVEAL

ASSEMBLY

STA

480

STA

460

STA

440

LOWER

AUXILLIARY SILL

UPPER DECK FLOOR BEAM

LOWER CHORDS

FWD

1

A

1572885

(SHEET 2 OF 4)
 FIGURE 19: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 9 AIRPLANES

December 21, 2004

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ALERT ALERT

This Figure applies to Group 9: 

MAIN ENTRY DOOR NO. 5

LEFT SIDE ONLY

S-20

S-22

2280

STA

S-27

S-24

S-19

S-17

S-14

S-13

2240

STA

2260

STA

2280

STA

2200

STA

2220

STA

2240

STA

2260

STA

STA

2300

2220

STA

UPPER SILL

LOWER AUXILIARY SILL

LOWER

SILL

UPPER AUXILIARY

SILL

THRESHOLD

FWD

B

2

2

1572886

(SHEET 3 OF 4)
 FIGURE 19: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 9 AIRPLANES

December 21, 2004

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ALERT ALERT

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. 

NOTE: Inspection of the skin will require removal of the scuff plates and thresholds.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Main Entry Door 

No. 1 Cutout Area

Detailed - (a)

2 Inspect Main Entry Door 

Cutouts (except 

Main Entry Door 

No. 1)

Detailed - (b)

(a) Do internal and external detailed inspection of the main entry door No. 1 cutout area below the 

upper deck. The inspection area is from the lower chord of the upper deck floor beam to the lower 

auxiliary sill, and between STA 400 and STA 500. Inspect both sides of the frames in this area. 

Inspect the upper main sill outer chord, web and inner chord. Pay special attention to the stringer 

cutouts and the inner chords of the frames.

(b) Do internal and external detailed inspections of the main entry door cutouts. The inspection area is 

from the upper auxiliary sill to the lower auxiliary sill, one frame forward and aft of the door edge 

frames. Inspect both sides of the frames in this area. Inspect the upper main sill outer chord, web 

and inner chord. Pay special attention to the stringer cutouts and the inner chords of the frames.

(SHEET 4 OF 4)
 FIGURE 20: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 10 AIRPLANES

December 21, 2004

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ALERT ALERT

FIGURE 20: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 10 AIRPLANES

ENTRY DOOR

NO. 1 MAIN

NO. 2 MAIN

ENTRY DOOR

NO. 3 MAIN

ENTRY DOOR

ENTRY DOOR

NO. 4 MAIN

ENTRY DOOR

NO. 5 MAIN

SEE A

SEE B

SEE C

SEE D

SEE E

1572888

(SHEET 1 OF 7)
 FIGURE 20: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 10 AIRPLANES

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ALERT ALERT

STA

520

STA

500

420

STA

400

STA

(RIGHT SIDE OPPOSITE)

MAIN ENTRY DOOR NO. 1

LEFT SIDE SHOWN

LOWER MAIN SILL

UPPER MAIN SILL

FORWARD FRAME

S-22

S-23

S-24

S-26

S-27

S-28

S-30

S-20

S-19

S-18

S-17

S-16

S-15

S-14

S-13

AFT FRAME

REVEAL

ASSEMBLY

STA

480

STA

460

STA

440

LOWER

AUXILLIARY SILL

UPPER DECK FLOOR BEAM

LOWER CHORDS

FWD

1

A

1572889

(SHEET 2 OF 7)
 FIGURE 20: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 10 AIRPLANES

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ALERT ALERT

FORWARD FRAME

STOP INTERCOSTAL

(9 LOCATIONS)

UPPER SILL

AFT FRAME

LOWER

AUXILIARY

SILL

LOWER SILL

854

STA

860

STA

STA

780

800

STA

820

STA

840

STA

STA

880

UPPER AUXILIARY SILL

S-29

S-28

S-27

S-24

S-23

S-22

S-16

S-15

S-20

S-18

S-17

S-19

S-30

S-14

S-13

MAIN ENTRY DOOR NO. 2

LEFT SIDE SHOWN

(RIGHT SIDE OPPOSITE)

FWD

2

2

B

1572891

(SHEET 3 OF 7)
 FIGURE 20: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 10 AIRPLANES

December 21, 2004

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ALERT ALERT

MAIN ENTRY DOOR NO. 3

(RIGHT SIDE OPPOSITE)

LEFT SIDE SHOWN

S-13

S-14

S-15

S-22

S-18

S-20

S-19

S-26

S-25

S-24

S-23

S-16

S-17

STA

1241

STA

1350

STA

1335

STA

1319

STA

1301

STA

1283

STA

1265

UPPER SILL

INTERCOSTAL

AFT STOP

(9 LOCATIONS)

AFT FRAME

LOWER SILL

FORWARD FRAME

INTERCOSTAL

FORWARD STOP

(9 LOCATIONS)

UPPER AUXILIARY SILL

FWD

C

2

2

1572892

(SHEET 4 OF 7)
 FIGURE 20: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 10 AIRPLANES

December 21, 2004

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ALERT ALERT

LEFT SIDE SHOWN

MAIN ENTRY DOOR NO. 4

(RIGHT SIDE OPPOSITE)

THRESHOLD

AFT FRAME

UPPER MAIN SILL

S-15

FORWARD

STOP ASSEMBLY

S-19

FORWARD FRAME

S-24

S-22

ASSEMBLY

FORWARD STOP

LOWER AUXILIARY SILL LOWER MAIN SILL

STA 1640

UPPER AUXILIARY SILL

STA 1680

STA 1700 S-17

S-13

FWD

D

2

2

1572893

(SHEET 5 OF 7)
 FIGURE 20: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 10 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

This Figure applies to Group 10: 

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. 

2220

STA

S-20

S-22

FORWARD

ASSEMBLY

STOP

UPPER SILL

AUXILIARY SILL

UPPER

FRAME

2280

STA

LOWER AUXILIARY SILL

THRESHOLD

S-27

S-24

S-19

FRAME

S-17

S-14

S-13

2240

STA

2260

STA

2280

STA

2200

STA

2220

STA

2240

STA

2260

STA

LOWER SILL

STA

2300

LEFT SIDE SHOWN

MAIN ENTRY DOOR NO. 5 

(RIGHT SIDE OPPOSITE)

FWD

2

E

2

1572894

(SHEET 6 OF 7)
 FIGURE 20: INSPECTION OF AREA 6 - MAIN ENTRY DOOR CUTOUTS - GROUP 10 AIRPLANES

December 21, 2004

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

NOTE: On Group 8 airplanes, only the cutouts for Main Entry Door 1 left and right are affected.

NOTE: Inspection of the skin will require removal of the scuff plates and thresholds.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Main Entry Door No. 1 

Cutout Area

Detailed - (a)

2 Inspect Main Entry Door 

Cutouts (except Main 

Entry Door No. 1)

Detailed - (b)

(a) Do internal and external detailed inspection of the main entry door No. 1 cutout area below the 

upper deck. The inspection area is from the lower chord of the upper deck floor beam to the lower 

auxiliary sill, and between STA 400 and STA 500. Inspect both sides of the frames in this area. 

Inspect the upper main sill outer chord, web and inner chord. Pay special attention to the stringer 

cutouts and the inner chords of the frames.

(b) Do internal and external detailed inspections of the main entry door cutouts. The inspection area is 

from the upper auxiliary sill to the lower auxiliary sill, one frame forward and aft of the door edge 

frames. Inspect both sides of the frames in this area. Inspect the upper main sill outer chord, web 

and inner chord. Pay special attention to the stringer cutouts and the inner chords of the frames.

Related Service Bulletins

Door Service Bulletin Subject

1, 2, 3, 

and 4

747-53-2358 Fuselage - Main Entry Doors Number 1, 2, 3, and 4 - Forward Edge Stop Support 

Fitting Inspection and Replacement

1 747-53A2396 Fuselage - Skins - Skin and Internal Doubler Inspection, Repair, and Modification 

Above Main Entry Door 1 at Station 460

1 747-53A2414 Fuselage - Main Entry Door 1 Cutout - Door Frame Aft Edge at Station 488 - 

Inspection and Repair

4 747-53A2416 Fuselage - Center Section - Body Station 1265 Frame Inspection, Repair, and 

Modification

1 747-53A2417 Fuselage - Main Entry Door Number 1 Cutout - Door Frame Forward Edge at 

Station 434 - Inspection and Repair

5 747-53A2450 Fuselage - Section 46 - Body Station 2231 Frame Inspection - Stringers 23 

through 31

2 747-53A2451 Fuselage - Section 42 - Door Number 2 Forward Edge Frame at Body Station 800 

- Inspection and Repair

3 747-53A2512 Fuselage - Main Entry Door Number 3 Cutout - Lower Forward Corner and Upper 

Aft Corner - Inspection and Repair at Left and Right Side Skin and Bearstrap.

(SHEET 7 OF 7)
 FIGURE 21: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 8 AIRPLANES

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ALERT ALERT

FIGURE 21: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 8 AIRPLANES

340

STA

520

STA

SEE A THROUGH D

1 ALL UPPER DECK

FLOOR BEAMS

1572899

(SHEET 1 OF 4)
 FIGURE 21: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 8 AIRPLANES

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ALERT ALERT

400

RIGHT SIDE FLOOR BEAMS

STA

270

STA

287

STA

302

STA

320

STA

330

STA

340

STA

360

STA

380

STA

BL

0

RBL

30

RBL

50

RBL

70

RBL

90

STA

270

STA

287

STA

302

STA

320

STA

330

STA

340

STA

360

STA

380

STA

BL 400

0

LBL

20

LEFT SIDE FLOOR BEAMS

LBL

40

LBL

60

LBL

80

A

B

1572901

(SHEET 2 OF 4)
 FIGURE 21: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 8 AIRPLANES

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ALERT ALERT

This Figure applies to Group 8: 

The step number shown below agrees with the number shown in the circle symbol in the figure. 

INBD

FWD

FWD OUTBD

C

D

RIGHT SIDE ONLY

BL 0.00

LBL 10.00

STA

420

LBL 24.17

LBL 46.83

LBL 58.88

LBL 65.96

STA

500

480

STA

STA

460

STA

440

STA

480

STA

460

STA

440

STA

420

BL 0.00

RBL 6.49

RBL 10.00

RBL 78.00

RBL 46.83

RBL 59.69

500

STA

LEFT SIDE ONLY

1572905

(SHEET 3 OF 4)
 FIGURE 21: INSPECTION OF AREA 1 - UPPER DECK FLOOR BEAMS - GROUP 8 AIRPLANES

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BOEING SERVICE BULLETIN 747-53A2500

ALERT ALERT

NOTE: If necessary, loosen and remove air conditioning ducts for access to the inspection area.

STEP TASK NAME PROCEDURE REFERENCES NOTES

1 Inspect Upper Chord Detailed - From below the floor 

beams (a) Floor Beam Web

Lower Chord

Cab Floor Web

(a) The inspection area is from STA 260 to STA 500. Pay particular attention to all nutplate locations, 

cutout locations, and to the floor beam connections to the frames. Also inspect the cab floor web (in 

the plane of the floor) from STA 260 to STA 330. Pay particular attention to all cutouts and nutplate 

locations.

NOTE: At STA 260, inspect the chord that is common to the cab floor web. Also inspect the

adjacent 2 inches of the vertical web.

(SHEET 4 OF 4)
 APPENDIX A: LOGIC DIAGRAM - GROUP 1 AND 6 AIRPLANES

December 21, 2004

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ALERT ALERT

APPENDIX A: LOGIC DIAGRAM - GROUP 1 AND 6 AIRPLANES

WHICHEVER IS LATER, DO

AFTER THE DATE ON THE

SERVICE BULLETIN,

OR 1,000 FLIGHT-CYCLES

22,000 TOTALFLIGHT-CYCLES,

WHEN THE AIRPLANE HAS

INSPECTIONS

AND EXTERNAL DETAILED

3, 4 AND 7. DO INTERNAL

INSPECTIONS OF AREAS 1,

INTERNAL DETAILED

OF AREAS 6, 8, AND 9.

WHICHEVER IS LATER,

OR 1,000 FLIGHT-CYCLES

25,000 TOTAL FLIGHT-CYCLES,

SERVICE BULLETIN,

DO AN INTERNAL DETAILED

AREAS 2 AND 5.

INSPECTION OF

WHEN THE AIRPLANE HAS

IN 3,000 FLIGHT-CYCLES.

DO EACH INSPECTION AGAIN

STRUCTURAL REPAIR MANUAL.

REPAIR AS SHOWN IN THE

BEFORE ANY MORE FLIGHTS,

CRACKS FOUND NO CRACKS FOUND

ORIGINAL RELEASE OF THIS AFTER THE DATE ON THE

ORIGINAL RELEASE OF THIS

424131
 APPENDIX B: LOGIC DIAGRAM - GROUP 2, 3, 4, 5, 7, 9, AND 10 AIRPLANES

December 21, 2004

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ALERT ALERT

APPENDIX B: LOGIC DIAGRAM - GROUP 2, 3, 4, 5, 7, 9, AND 10 AIRPLANES

WHICHEVER IS LATER, DO

2, 3, 4 AND 7. DO INTERNAL

OF AREAS 6, 8, AND 9.

AND EXTERNAL DETAILED

INSPECTIONS

INTERNAL DETAILED

INSPECTIONS OF AREAS 1,

WHEN THE AIRPLANE HAS

22,000 TOTAL FLIGHT-CYCLES,

OR 1,000 FLIGHT-CYCLES

SERVICE BULLETIN,

WHICHEVER IS LATER,

WHEN THE AIRPLANE HAS

INSPECTION OF

AREA 5.

DO AN INTERNAL DETAILED

SERVICE BULLETIN,

25,000 TOTAL FLIGHT-CYCLES,

OR 1,000 FLIGHT-CYCLES

IN 3,000 FLIGHT-CYCLES.

DO EACH INSPECTION AGAIN

STRUCTURAL REPAIR MANUAL.

REPAIR AS SHOWN IN THE

BEFORE ANY MORE FLIGHTS,

CRACKS FOUND NO CRACKS FOUND

AFTER THE DATE ON THE

ORIGINAL RELEASE OF THIS AFTER THE DATE ON THE

ORIGINAL RELEASE OF THIS

424133