Commercial 

Airplanes 747

Service Bulletin

SPECIAL ATTENTION

Number: 747-52-2286

Original Issue: September 28, 2007

Revision 1: October 28, 2010

ATA System: 5200

SUBJECT: DOORS - Forward, Aft and Nose Cargo Doors - Cargo Door Control Switch -

Replacement

Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15

CFR 730-774). An export license may be required before it is used for development, production or use by foreign

persons from specific countries. The controller of this data has the individual responsibility to abide by all export

laws.

ECCN: 9E991

BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET

Copyright © 2007 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Unpublished Work - All Rights Reserved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, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner,

BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and the

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connection with this document unless provided in writing by Boeing.

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2.0
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BOEING SERVICE BULLETIN 747-52-2286

BLANK PAGE
Table of Contents

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

Summary ...................................................... 7

1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 24

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . . . 27

3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 27

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

FIGURE 1: REPLACE CARGO DOOR CONTROL SWITCH - FORWARD CARGO DOOR . . . . . . 31

FIGURE 2: REPLACE CARGO DOOR CONTROL SWITCH - AFT CARGO DOOR . . . . . . . . . . 33

FIGURE 3: REPLACE CARGO DOOR CONTROL SWITCH - NOSE CARGO DOOR [Group 2-3] . . 35

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BOEING SERVICE BULLETIN 747-52-2286

BLANK PAGE
Commercial 

Airplanes 747

Service Bulletin

SPECIAL ATTENTION

Revision Transmittal Sheet Number: 747-52-2286

Original Issue: September 28, 2007

Revision 1: October 28, 2010

ATA System: 5200

SUBJECT: DOORS - Forward, Aft and Nose Cargo Doors - Cargo Door Control Switch -

Replacement

This revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION

No more work is necessary on airplanes changed in accordance with the original issue of this service bulletin.

747-400F Airplanes line number 1382 through 1419 were added to the service bulletin effectivity as new Group

3.

Federal Aviation Administration (FAA) Airworthiness Directive AD 2009-22-08 is related to this service bulletin.

REASON FOR REVISION

This revision is sent to add 747-400F airplanes line number 1382 through 1419 as new Group 3. It had previously

been planned that scheduled cargo door control switch replacement on these airplanes would be addressed by

a revision to the 747-400 Maintenance Planning Document (MPD), Boeing Document D621U400. However, it

was later determined that those airplanes would be added to this service bulletin rather than revising the 747-400

MPD.

In addition, in Paragraph 1.E., Compliance, the table was changed to add Group 3, and to clarify the compliance

time for Group 1 and Group 2. "Within 6 years from the date of issuance of the original certificate of airworthiness

or the original export certificate of airworthiness" has been included as an option to "within 24 months after the

original issue date on this service bulletin".

References to FAA AD 2009-22-08 were added as part of this revision.

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.

REVISION HISTORY

Original Issue: September 28, 2007

Revision 1: October 28, 2010

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BOEING SERVICE BULLETIN 747-52-2286

BLANK PAGE
Commercial 

Airplanes 747

Service Bulletin

SPECIAL ATTENTION

Summary Number: 747-52-2286

Original Issue: September 28, 2007

Revision 1: October 28, 2010

ATA System: 5200

SUBJECT: DOORS - Forward, Aft and Nose Cargo Doors - Cargo Door Control Switch -

Replacement

BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

CONCURRENT REQUIREMENTS

None.

BACKGROUND

Boeing has received 12 reports from 8 operators of problems associated with uncommanded operation of the

Forward and Aft Cargo Doors. 10 of these reports came from 757 airplanes. Further testing of the Cargo Door

Control Switch found that the switch remained in the CLOSE position after it was released, causing the door to

continue moving. The cause of the switch failure (Part Number MS25307-272) is related to the rated switch

operation cycle life. The switch is located in the external control panel forward of each lower lobe cargo door

and aft of the nose cargo door. The number of flight cycles for these airplanes were between 9,390 and 22,529.

On one occasion an employee was killed, trapped between the cargo door and door frame. Failure to replace

the Cargo Door Control Switch can result in injuries to persons and damage to the airplane and equipment.

The MS25307-272 Cargo Door Control Switch is not installed at the nose cargo door on 747-200C and 747-200F

airplanes.

This bulletin establishes the replacement interval and gives replacement details for the Forward, Aft and Nose

Cargo Door Control Switches.

Boeing Service Related Problem (SRP) 747-SRP-52-0084 is related to this service bulletin.

ACTION

Replace the Forward, Aft and Nose Cargo Door Control Switches at the times given in Paragraph 1.E.,

Compliance.

EFFECTIVITY

All 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F,

747SP, 747SR Airplanes. Refer to Paragraph 1.A.1 Airplanes, for the list of affected airplanes.

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COMPLIANCE

Federal Aviation Administration (FAA) Airworthiness Directive AD 2009-22-08 is related to this service bulletin.

See Service Bulletin Paragraph 1.E. for compliance information.

INDUSTRY SUPPORT INFORMATION

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

MANPOWER

Airplanes Total Task Hours Elapsed Hours

Group 1 3.25 3.25

Group 2 and 4.25 4.25

Group 3

MATERIAL INFORMATION

Operator Supplied Parts/Materials.

Refer to Paragraph 2.A., Material - Price and Availability.

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BLANK PAGE
Commercial 

Airplanes 747

Service Bulletin

SPECIAL ATTENTION

Number: 747-52-2286

Original Issue: September 28, 2007

Revision 1: October 28, 2010

ATA System: 5200

SUBJECT: DOORS - Forward, Aft and Nose Cargo Doors - Cargo Door Control Switch -

Replacement

BOEING RECOMMENDS THAT EACH OPERATOR EXAMINE THIS SERVICE BULLETIN IMMEDIATELY.

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.

GROUP CONFIGURATION DESCRIPTION

747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F,

747-300, 747-400, 747-400D, 747SP, 747SR Airplanes, Line number

1 through 1381

1 -

2 - 747-400F Airplanes, Line number 968 through 1381

3 - 747-400F Airplanes, Line number 1382 through 1419

Airplane Models:

747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400,

747-400D, 747-400F, 747SP, 747SR

Variable Number Group

RA001 - RA034 1

RA101 - RA115 1

RA161 - RA164 1

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Variable Number Group

RA201 - RA203 1

RA216 - RA217 1

RA245 - RA246 1

RA251 - RA266 1

RA301 - RA318 1

RA351 - RA360 1

RA369 - RA373 1

RA401 - RA418 1

RA501 - RA502 1

RA521 - RA528 1

RA532 - RA548 1

RA551 - RA552 1

RA559 - RA561 1

RA581 - RA582 1

RA585 1

RA601 - RA602 1

RA631 - RA635 1

RA651 - RA652 1

RA671 - RA677 1

RA701 - RA702 1

RA721 - RA731 1

RA741 - RA745 1

RA749 - RA750 1

RA761 - RA762 1

RA781 - RA784 1

RA901 - RA916 1

RB001 - RB016 1

RB041 - RB044 1

RB071 - RB075 1

RB101 - RB102 1

RB411 - RB413 1

RB421 1

RB601 - RB607 1

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BOEING SERVICE BULLETIN 747-52-2286
Variable Number Group

RB681 - RB697 1

RB711 1

RB721 - RB723 1

RB741 - RB748 1

RD001 - RD004 1

RD021 - RD022 1

RD041 - RD059 1

RD071 - RD072 1

RD081 - RD083 1

RD091 - RD092 1

RD101 - RD104 1

RD121 - RD127 1

RD131 - RD144 1

RD166 - RD167 1

RD171 - RD172 1

RD181 - RD183 1

RD201 - RD204 1

RD221 - RD227 1

RD231 - RD235 1

RD241 - RD243 1

RD251 - RD262 1

RD271 - RD272 1

RD291 - RD292 1

RD301 - RD302 1

RD311 1

RD351 - RD358 1

RD361 - RD366 1

RD381 - RD383 1

RD411 - RD414 1

RD421 - RD426 1

RD431 - RD435 1

RD441 - RD442 1

RD451 - RD456 1

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BOEING SERVICE BULLETIN 747-52-2286
Variable Number Group

RD461 1

RD471 - RD475 1

RD513 - RD519 1

RD531 - RD533 1

RD551 1

RD561 1

RD571 1

RD581 - RD583 1

RD591 - RD593 1

RD601 - RD607 1

RD621 - RD623 1

RD641 - RD649 1

RD651 - RD659 1

RD661 1

RD671 1

RD681 - RD682 1

RD691 - RD692 1

RD701 - RD702 1

RD721 - RD722 1

RD741 - RD742 1

RD751 - RD755 1

RD761 1

RD771 - RD775 1

RD781 - RD783 1

RD791 - RD792 1

RE001 1

RF001 - RF006 1

RG001 - RG009 1

RG091 1

RG095 1

RG101 - RG104 1

RG121 - RG126 1

RG141 - RG142 1

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BOEING SERVICE BULLETIN 747-52-2286
Variable Number Group

RG161 - RG164 1

RG171 - RG174 1

RG191 - RG193 1

RG211 - RG213 1

RG221 - RG222 1

RH101 - RH102 1

RH111 - RH112 1

RH121 - RH122 1

RJ131 - RJ133 1

RJ151 - RJ152 1

RJ301 - RJ303 1

RJ321 - RJ322 1

RJ331 - RJ333 1

RL401 - RL403 2

RL411 - RL436 2

RL451 - RL456 2

RL461 - RL462 2

RL471 - RL473 2

RL474 - RL481 3

RL491 - RL492 2

RL501 - RL502 2

RL511 - RL512 2

RL513 - RL516 3

RL521 2

RL522 3

RL531 2

RL532 - RL534 3

RL551 3

RL561 - RL568 3

RL571 - RL572 3

RL576 - RL577 3

RL579 3

RL581 - RL586 3

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BOEING SERVICE BULLETIN 747-52-2286
Variable Number Group

RL651 - RL655 2

RL671 - RL675 2

RL681 - RL683 2

RL684 3

RL751 - RL752 2

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

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BOEING SERVICE BULLETIN 747-52-2286
Variable Number Group

RM445 1

RM801 - RM803 1

RM811 - RM813 1

RM851 - RM859 2

RM861 - RM863 2

RM871 - RM889 2

RM890 3

RM891 - RM899 2

RM901 - RM906 2

RM911 2

RR001 - RR005 1

RR021 - RR025 1

RR031 1

RR201 - RR206 1

RR221 - RR226 1

RR261 - RR267 1

RR301 - RR310 1

RR331 - RR332 1

RR336 1

RR341 - RR345 1

RR361 - RR362 1

RR421 - RR422 1

RR431 - RR432 1

RR441 - RR442 1

RR451 1

RR501 - RR504 1

RR521 - RR522 1

RR526 1

RR531 1

RR551 - RR556 1

RR561 1

RR566 1

RR701 2

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BOEING SERVICE BULLETIN 747-52-2286
Variable Number Group

RR721 - RR724 2

RR746 - RR748 2

RR851 - RR856 2

RR861 - RR862 2

RR951 - RR952 2

RS001 - RS002 1

RS201 1

RS211 - RS212 1

RS221 - RS222 1

RS231 - RS241 1

RS251 - RS259 1

RS263 1

RS265 - RS268 1

RS271 - RS276 1

RS291 - RS292 1

RS301 - RS306 1

RS311 - RS320 1

RS331 - RS333 1

RS341 - RS342 1

RS699 1

RS701 - RS703 1

RS711 - RS713 1

RS721 - RS722 1

RS731 - RS732 1

RS741 - RS743 1

RS751 - RS752 1

RS761 - RS762 1

RS771 1

RS781 - RS782 1

RS786 1

RT001 - RT014 1

RT021 - RT022 1

RT031 - RT035 1

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BOEING SERVICE BULLETIN 747-52-2286
Variable Number Group

RT041 - RT047 1

RT061 1

RT071 - RT075 1

RT101 - RT103 1

RT121 1

RT131 - RT137 1

RT151 - RT152 1

RT161 - RT168 1

RT401 - RT412 1

RT431 - RT447 1

RT451 - RT469 1

RT471 - RT499 1

RT501 - RT535 1

RT551 - RT568 1

RT571 - RT591 1

RT601 - RT657 1

RT671 - RT673 1

RT681 - RT682 1

RT691 - RT699 1

RT701 - RT704 1

RT711 - RT717 1

RT741 - RT757 1

RT776 - RT777 1

RT781 - RT784 1

RT801 - RT803 1

RT811 - RT814 1

RT831 - RT837 1

RT861 - RT864 1

RT876 - RT880 1

RT931 - RT932 1

RT945 - RT949 1

RT951 - RT955 1

RT966 - RT967 1

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BOEING SERVICE BULLETIN 747-52-2286
Variable Number Group

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

2. Spares Affected

None.

B. Concurrent Requirements

None.

C. Reason

Boeing has received 12 reports from 8 operators of problems associated with uncommanded operation

of the Forward and Aft Cargo Doors. 10 of these reports came from 757 airplanes. Further testing of

the Cargo Door Control Switch found that the switch remained in the CLOSE position after it was

released, causing the door to continue moving. The cause of the switch failure (Part Number

MS25307-272) is related to the rated switch operation cycle life. The switch is located in the external

control panel forward of each lower lobe cargo door and aft of the nose cargo door. The number of

flight cycles for these airplanes were between 9,390 and 22,529. On one occasion an employee was

killed, trapped between the cargo door and door frame. Failure to replace the Cargo Door Control

Switch can result in injuries to persons and damage to the airplane and equipment.

The MS25307-272 Cargo Door Control Switch is not installed at the nose cargo door on 747-200C and

747-200F airplanes.

This bulletin establishes the replacement interval and gives replacement details for the Forward, Aft

and Nose Cargo Door Control Switches.

Revision 1 is sent to add 747-400F airplanes line number 1382 through 1419 as new Group 3. It had

previously been planned that scheduled cargo door control switch replacement on these airplanes

would be addressed by a revision to the 747-400 Maintenance Planning Document (MPD), Boeing

Document D621U400. However, it was later determined that those airplanes would be added to this

service bulletin rather than revising the 747-400 MPD. In addition, in Paragraph 1.E., Compliance, the

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BOEING SERVICE BULLETIN 747-52-2286
table was changed to add Group 3, and to clarify the compliance time for Group 1 and Group 2. "Within

6 years from the date of issuance of the original certificate of airworthiness or the original export

certificate of airworthiness" has been included as an option to "within 24 months after the original issue

date on this service bulletin". References to FAA AD 2009-22-08 were also added as part of Revision

1.

Boeing Service Related Problem (SRP) 747-SRP-52-0084 is related to this service bulletin.

D. Description

Replace the Forward, Aft and Nose Cargo Door Control Switches at the times given in Paragraph 1.E.,

Compliance.

No more work is necessary on airplanes changed in accordance with the original issue of this service

bulletin.

The work in this service bulletin is done in the maintenance zone(s) given below.

Group 1:

Affected Maintenance Zones

Model Zone

747-100, 747-100B, 747-100B 122, 142

SUD, 747-200B, 747-200C,

747-200F, 747-300, 747-400,

747-400D, 747SP, 747SR

Group 2-3:

Affected Maintenance Zones

Model Zone

747-400F 122, 142, 211

E. Compliance

Federal Aviation Administration (FAA) Airworthiness Directive AD 2009-22-08 is related to this service

bulletin.

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BOEING SERVICE BULLETIN 747-52-2286
Table 1: Cargo Door Control Switch Replacement

Repeat Interval

(Not to Exceed)

Compliance Time (Whichever

Occurs Later)

Condition Action

Within 6 years 6 years

from the date of

issuance of the

original certificate of airworthiness or the original export certificate of airworthiness.

Within 24

months after the

original issue

date on this service bulletin.

Replace the Control

Switch in the external

control panels for the

Forward and Aft Cargo

Doors in accordance with

Paragraph 3.B., Work Instructions, Part 1.

Group 1 Airplanes

Within 6 years 6 years

from the date of

issuance of the

original certificate of airworthiness or the original export certificate of airworthiness.

Within 24

months after the

original issue

date on this service bulletin.

Replace the Control

Switch in the external

control panels for the

Forward and Aft Cargo

Doors and for the Nose

Cargo Door in accordance with Paragraph

3.B., Work Instructions,

Part 2.

Group 2 Airplanes

Within 6 years from the date of is- 6 years

suance of the original certificate

of airworthiness or the original export certificate of airworthiness.

Replace the Control

Switch in the external

control panels for the

Forward and Aft Cargo

Doors and for the Nose

Cargo Door in accordance with Paragraph

3.B., Work Instructions,

Part 2.

Group 3 Airplanes

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.

The Manager of the FAA Seattle Aircraft Certification Office (ACO) approves the modification defined

in this service bulletin with the corresponding compliance times specified in Table 1 under Paragraph

1.E., Compliance of Service Bulletin 747-52-2286 Revision 1 as an AMOC to the corresponding

requirements of paragraphs (c), (f) and (h) of AD 2009-22-08. All provisions of AD 2009-22-08 that are

not specifically referenced in this paragraph remain fully applicable and must be complied with.

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BOEING SERVICE BULLETIN 747-52-2286
G. Manpower

The table below shows an estimate of the task hours necessary to do this replacement 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 inspect the work

— Time to cure the materials

— Time to make the parts

— Time to find the tools.

Group 1:

Table 1 - Replacement of the Forward and Aft Cargo Door Control Switches

Number of Per- Task Hours Elapsed Hours

sons

Task

Open Access 1 0.50 0.50

Replace Cargo Door Control Switch

Figure 1 1 1.00 1.00

Figure 2 1 1.00 1.00

Close Access 1 0.50 0.50

Test Cargo Doors 1 0.25 0.25

TOTAL FOR EACH AIRPLANE 3.25 3.25

Group 2-3:

Table 2 - Replacement of the Forward, Aft and Nose Cargo Door Control Switches

Number of Per- Task Hours Elapsed Hours

sons

Task

Open Access 1 0.50 0.50

Replace Cargo Door Control Switch

Figure 1 1 1.00 1.00

Figure 2 1 1.00 1.00

Figure 3 1 1.00 1.00

Close Access 1 0.50 0.50

Test Cargo Doors 1 0.25 0.25

TOTAL FOR EACH AIRPLANE 4.25 4.25

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BOEING SERVICE BULLETIN 747-52-2286
H. Weight and Balance Changes

None.

I. Electrical Load Data

Not changed.

J. References

1. Existing Data:

a. Service Related Problem (SRP) 747-SRP-52-0084

b. 747-400 Aircraft Maintenance Manual (AMM) 52-31-00, 52-31-17, 52-34, 52-34-00, 52-34-10

c. 747-100/200/300 Aircraft Maintenance Manual (AMM) 52-34, 52-34-00, 52-34-10

d. 747-100/200/300 Baggage and Cargo Loading Manual (BCLM) 25-53, 25-57

e. 747-400 Baggage and Cargo Loading Manual (BCLM) 25-53, 25-57

f. Standard Wiring Practices Manual (SWPM) 20-10-11, 20-10-12, 20-30-00

g. Federal Aviation Administration (FAA) Airworthiness Directive 2009-22-08

2. Data supplied with this Service Bulletin:

None.

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

Drawing Number Title

65B41786 Switch Instl- Cargo Door Control & Lights

65B07320 Electrical Installation - Forward Cargo Door, Wire and Equipment

65B07323 Electrical Installation - Aft Cargo Door, Wire and Equipment

284U1590 Nose Door and Light Control Assembly

These drawings were used to prepare this service bulletin. These drawings are not necessary to

make the specified changes, and are not supplied with this service bulletin. These drawings may

not be applicable to all airplane configurations or operators.

K. Publications Affected

1. Publications:

Publication Chapter-Section

747-100/200/300 AMM 52-34, 747-400 AMM

52-34, 747-400 AMM 52-31-00

747 Maintenance Manual

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BOEING SERVICE BULLETIN 747-52-2286
Publication Chapter-Section

747-100/200/300 BCLM 25-53, 747-

100/200/300 BCLM 25-57, 747-400 BCLM

25-53, 747-400 BCLM 25-57

747 Baggage/Cargo Loading Manual

2. Damage Tolerance Based Structural Inspections:

Boeing has evaluated the repairs and/or changes in this service bulletin for effects on Fatigue

Critical Structure (FCS) and for changes to Damage Tolerance Inspections (DTI) required in the

Maintenance Program. This service bulletin does not affect FCS, therefore DTIs are not necessary.

L. Interchangeability and Intermixability of Parts

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

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BLANK PAGE
2. MATERIAL INFORMATION

A. Material - Price and Availability

The operator can supply the parts and materials shown in Paragraph 2.C., Parts Necessary for Each

Airplane. As an alternative, operators can purchase the parts from Boeing Spares. This service bulletin

does not show the Boeing price and supply data.

B. Industry Support Information

Boeing warranty remedies are not available for the 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:

Part Number / QTY Name Notes

Specification

Cargo door control switch.

Group 1 airplanes only require

2 Toggle Switches.

MS25307-272 3 Toggle Switch

BMS5-45 Class A is an acceptable alternate sealant.BMS5-37 - Sealant

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, can be necessary. Examine

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

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BOEING SERVICE BULLETIN 747-52-2286

BLANK PAGE
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. These work instructions refer to procedures included on other Boeing documents.

When the words "refer to" are used and the operator has an accepted alternative

procedure, the accepted alternative procedure can be used. When the words "in

accordance with" are included in the instruction, the procedure in the Boeing document

must be used.

4. Refer to the Boeing Standard Wiring Practices Manuals SWPM 20-10-11and SWPM

20-10-12 for the wire installation procedures.

B. WORK INSTRUCTIONS

Group 1:

PART 1 - FORWARD AND AFT CARGO DOOR CONTROL SWITCH REPLACEMENT

1. Get access to the applicable access panel, 122AR for the forward cargo door control switch and

142AR for the aft cargo door control switch.

2. Replace Cargo Door Control Switch for the forward cargo door in accordance with FIGURE 1.

3. Replace Cargo Door Control Switch for the aft cargo door in accordance with FIGURE 2.

4. Test the forward and aft cargo doors. Position cargo door control switch to OPEN then to CLOSE

and check that door operates. Refer to 747-100/200/300 AMM 52-34-00 and 747-400 AMM 52-34-00

as accepted procedures.

5. Put the airplane back to a serviceable condition.

Group 2-3:

PART 2 - FORWARD, AFT AND NOSE CARGO DOOR CONTROL SWITCH REPLACEMENT

1. Get access to the applicable access panel, 122AR for the forward cargo door control switch, 142AR

for the aft cargo door control switch and H121 for the nose cargo door control switch.

2. Replace Cargo Door Control Switch for the forward cargo door in accordance with FIGURE 1.

3. Replace Cargo Door Control Switch for the aft cargo door in accordance with FIGURE 2.

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BOEING SERVICE BULLETIN 747-52-2286
4. Replace Cargo Door Control Switch for the nose cargo door in accordance with FIGURE 3.

5. Test the forward, aft and nose cargo doors. Position cargo door control switch to OPEN then to

CLOSE and check that door operates. Refer to 747-100/200/300 AMM 52-34-00, 747-400 AMM

52-34-00 and 747-400 AMM 52-31-00 as accepted procedures.

6. Put the airplane back to a serviceable condition.

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BOEING SERVICE BULLETIN 747-52-2286
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of parts necessary for this figure.

FIGURE 1: REPLACE CARGO DOOR CONTROL SWITCH - FORWARD CARGO DOOR

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 747-52-2286
STEP TASK NAME IDENTIFICATION QTY MORE DATA

Refer to 747-100/200/300 AMM

52-34-10 or 747-400 AMM 52-

34-107 as an accepted procedure.

Cargo Door Control MS25307-272 1

Switch

1 Remove

Refer to 747-100/200/300 AMM

52-34-10 or 747-400 AMM 52-

34-10 as an accepted procedure. (a)

Cargo Door Control MS25307-272 1

Switch

2 Install (New)

(a) Remove old sealant from wire connectors. Brush coat the switch terminals with BMS5-37 or BMS5-45

Class A sealant after all wires are connected. Refer to SWPM 20-30-00 as an accepted procedure.

FIGURE 1: REPLACE CARGO DOOR CONTROL SWITCH - FORWARD CARGO DOOR

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 747-52-2286
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of parts necessary for this figure.

FIGURE 2: REPLACE CARGO DOOR CONTROL SWITCH - AFT CARGO DOOR

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 747-52-2286
STEP TASK NAME IDENTIFICATION QTY MORE DATA

Refer to 747-100/200/300 AMM

52-34-10 or 747-400 AMM 52-

34-10 as an accepted procedure.

Cargo Door Control MS25307-272 1

Switch

1 Remove

Refer to 747-100/200/300 AMM

52-34-10 or 747-400 AMM 52-

34-10 as an accepted procedure. (a)

Cargo Door Control MS25307-272 1

Switch

2 Install (New)

(a) Remove old sealant from wire connectors. Brush coat the switch terminals with BMS5-37 or BMS5-45

Class A sealant after all wires are connected. Refer to SWPM 20-30-00 as an accepted procedure.

FIGURE 2: REPLACE CARGO DOOR CONTROL SWITCH - AFT CARGO DOOR

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 747-52-2286
This Figure applies only to: Group 2-3.

FIGURE 3: REPLACE CARGO DOOR CONTROL SWITCH - NOSE CARGO DOOR

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 747-52-2286
The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY

numbers shown below are the number of parts necessary for this figure.

STEP TASK NAME IDENTIFICATION QTY MORE DATA

Refer to 747-400 AMM 52-31-

17 as an accepted procedure.

Cargo Door Control MS25307-272 1

Switch

1 Remove

Refer to 747-400 AMM 52-31-

17 as an accepted procedure.

(a)

Cargo Door Control MS25307-272 1

Switch

2 Install (New)

(a) Remove old sealant from wire connectors. Brush coat the switch terminals with BMS5-37 or BMS5-45

Class A sealant after all wires are connected. Refer to SWPM 20-30-00 as an accepted procedure.

FIGURE 3: REPLACE CARGO DOOR CONTROL SWITCH - NOSE CARGO DOOR

(SHEET 2 OF 2)

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