Commercial 

Airplanes 727

Service Bulletin

Number: 727-28-0134

Original Issue: January 12, 2012

ATA System: 2811

SUBJECT: FUEL - Integral Fuel Tanks - Access Door Inspection/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

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Copyright © 2012 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Unpublished Work - All Rights Reserved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.

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10.0
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BLANK PAGE
Table of Contents

Summary ...................................................... 5

1. PLANNING INFORMATION ........................................ 7

A. Effectivity ................................................ 7

1. Airplanes ............................................. 7

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

E. Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . . 14

K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

A. Material - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . . . 15

3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

E. Special Tooling - Price and Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . . . 15

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

FIGURE 1: ACCESS DOOR INSPECTION - LEFT WING . . . . . . . . . . . . . . . . . . . . . . . . 19

FIGURE 2: ACCESS DOOR INSPECTION - RIGHT WING . . . . . . . . . . . . . . . . . . . . . . . 21

APPENDIX A: PROCEDURE FOR ACCESS DOOR INSPECTION . . . . . . . . . . . . . . . . . . . . . 23

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BOEING SERVICE BULLETIN 727-28-0134
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BOEING SERVICE BULLETIN 727-28-0134

BLANK PAGE
Commercial 

Airplanes 727

Service Bulletin

Summary Number: 727-28-0134

Original Issue: January 12, 2012

ATA System: 2811

SUBJECT: FUEL - Integral Fuel Tanks - Access Door Inspection/Replacement

CONCURRENT REQUIREMENTS

Refer to Paragraph 1.B., Concurrent Requirements.

BACKGROUND

This service bulletin provides instructions to inspect the Wing Fuel Tank Access Doors to make sure that Impact

Resistant Access Doors are installed in the correct locations and stencils and index markers are applied. Fire

can result from damage to a standard access door if it is located where an Impact Resistant Access Door is

required.

An operator identified a standard access door located where an Impact Resistant Access Door is required. In

addition, the operator examined its spares stock and found that some Impact Resistant Access Doors were

without stencils. These findings have raised a concern about the possibility of more standard access doors being

installed at locations where Impact Resistant Access Doors are required. Impact Resistant Access Doors minimize

risk of penetration from engine debris or objects thrown by airplane tires. By accomplishing the inspection in

this service bulletin, operators can make sure that stencils and index markers are applied and Impact Resistant

Access Doors are installed at the correct locations, providing increased resistance to Wing Fuel Tank penetration.

Boeing Service Related Problem (SRP) 727-SRP-57-0225 is related to this service bulletin.

ACTION

Identify the Wing Fuel Tank Access Doors. Do a General Visual Inspection or an ultrasonic Non-Destructive

Test (NDT) to make sure that Impact Resistant Access Doors are installed in the correct locations. If a standard

access door is identified in a location where an Impact Resistant Access Door is required, replace the door with

an Impact Resistant Access Door. Do a General Visual Inspection to make sure that stencils and index markers

are applied. If a stencil and/or index marker is missing, apply new stencil and/or index marker.

EFFECTIVITY

All 727, 727-100/100C/200/200F and 727C Airplanes.

Refer to Paragraph 1.A.1, Effectivity.

COMPLIANCE

Refer to Paragraph 1.E., Compliance.

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INDUSTRY SUPPORT INFORMATION

Refer to Paragraph 2.B., Industry Support Information.

MANPOWER

Refer to Paragraph 1.G., Manpower.

MATERIAL INFORMATION

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

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BOEING SERVICE BULLETIN 727-28-0134
Commercial 

Airplanes 727

Service Bulletin

Number: 727-28-0134

Original Issue: January 12, 2012

ATA System: 2811

SUBJECT: FUEL - Integral Fuel Tanks - Access Door Inspection/Replacement

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

1 - All 727, 727-100/100C/200/200F and 727C Airplanes

Airplane Models:

727, 727-100, 727-100C, 727-200, 727-200F, 727C

Variable Number Group

E0001 - E0042 1

E0101 - E0140 1

E0201 - E0216 1

E0301 - E0351 1

E0401 - E0423 1

E3001 - E3006 1

E3011 - E3014 1

E3021 - E3040 1

E3059 1

E3061 - E3077 1

E3101 - E3103 1

E3111 - E3118 1

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Variable Number Group

E3141 - E3152 1

E3171 - E3177 1

E3201 - E3206 1

E3221 - E3224 1

E3241 - E3290 1

E3341 - E3350 1

E3401 - E3421 1

E3451 - E3452 1

E3471 - E3474 1

E3501 - E3513 1

E3516 - E3523 1

E3551 - E3553 1

E3571 - E3578 1

E3601 - E3604 1

E3621 - E3622 1

E3651 - E3655 1

E3677 1

E3681 - E3684 1

E3701 - E3704 1

E3751 - E3755 1

E3781 - E3784 1

E5001 - E5011 1

E5031 - E5068 1

E5101 - E5116 1

E5141 - E5143 1

E5161 - E5164 1

E5201 - E5203 1

E5221 - E5245 1

E5251 - E5252 1

E5271 - E5281 1

E5301 - E5306 1

E5351 - E5353 1

E5381 - E5382 1

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BOEING SERVICE BULLETIN 727-28-0134
Variable Number Group

E5401 - E5424 1

E5426 - E5429 1

E5433 1

E5435 1

E5451 - E5455 1

E5481 - E5483 1

E5501 - E5502 1

QA001 - QA046 1

QA051 - QA099 1

QA101 - QA199 1

QA201 - QA225 1

QA301 - QA349 1

QA351 - QA376 1

QA378 1

QA401 - QA499 1

QA501 - QA537 1

QA551 - QA579 1

QA581 - QA585 1

QA601 - QA688 1

QA701 - QA753 1

QA801 - QA805 1

QA851 - QA899 1

QA901 - QA946 1

QA949 1

QB001 - QB002 1

QB031 - QB049 1

QB051 - QB068 1

QB101 - QB110 1

QB114 - QB119 1

QB121 - QB149 1

QB151 - QB158 1

QB201 - QB220 1

QB301 - QB316 1

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BOEING SERVICE BULLETIN 727-28-0134
Variable Number Group

QB351 - QB352 1

QB401 - QB407 1

QB451 - QB458 1

QB501 - QB575 1

QB601 - QB629 1

QB651 1

QB701 - QB705 1

QB801 - QB810 1

QB901 - QB904 1

QD001 - QD012 1

QD031 - QD046 1

QD085 - QD088 1

QD101 - QD105 1

QD121 - QD127 1

QD141 - QD149 1

QD161 - QD164 1

QD191 - QD192 1

QD201 - QD239 1

QD281 - QD284 1

QD301 - QD305 1

QD321 - QD330 1

QD351 1

QD401 - QD403 1

QD407 1

QD410 1

QD421 - QD427 1

QD441 - QD453 1

QD471 - QD475 1

QD501 - QD518 1

QD551 - QD558 1

QD571 - QD572 1

QD581 - QD583 1

QD601 - QD607 1

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BOEING SERVICE BULLETIN 727-28-0134
Variable Number Group

QD621 - QD624 1

QD641 1

QD661 - QD663 1

QD681 - QD685 1

QD691 - QD692 1

QD701 - QD702 1

QD711 - QD717 1

QD741 1

QD761 - QD769 1

QD781 - QD782 1

QD791 1

QD801 - QD804 1

QD821 - QD828 1

QD901 - QD910 1

QD931 - QD932 1

QD951 - QD954 1

QD971 - QD973 1

QD991 - QD992 1

QE001 - QE002 1

QL001 - QL008 1

QL031 - QL032 1

QL081 1

QL501 - QL515 1

2. Spares Affected

None.

B. Concurrent Requirements

The service bulletin listed below must be done before or at the same time as this service bulletin:

Company Service Bulletin Description

Boeing 727-28-0101 Revision 1 Fuel tank access door replacement

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BOEING SERVICE BULLETIN 727-28-0134
C. Reason

This service bulletin provides instructions to inspect the Wing Fuel Tank Access Doors to make sure

that Impact Resistant Access Doors are installed in the correct locations and stencils and index markers

are applied. Fire can result from damage to a standard access door if it is located where an Impact

Resistant Access Door is required.

An operator identified a standard access door located where an Impact Resistant Access Door is

required. In addition, the operator examined its spares stock and found that some Impact Resistant

Access Doors were without stencils. These findings have raised a concern about the possibility of more

standard access doors being installed at locations where Impact Resistant Access Doors are required.

Impact Resistant Access Doors minimize risk of penetration from engine debris or objects thrown by

airplane tires. By accomplishing the inspection in this service bulletin, operators can make sure that

stencils and index markers are applied and Impact Resistant Access Doors are installed at the correct

locations, providing increased resistance to Wing Fuel Tank penetration.

Boeing Service Related Problem (SRP) 727-SRP-57-0225 is related to this service bulletin.

D. Description

Identify the Wing Fuel Tank Access Doors. Do a General Visual Inspection or an ultrasonic

Non-Destructive Test (NDT) to make sure that Impact Resistant Access Doors are installed in the

correct locations. If a standard access door is identified in a location where an Impact Resistant Access

Door is required, replace the door with an Impact Resistant Access Door. Do a General Visual Inspection

to make sure that stencils and index markers are applied. If a stencil and/or index marker is missing,

apply new stencil and/or index marker.

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

Affected Maintenance Zones

Model Zone

727, 727-100, 727-100C, 727- 5-72, 5-73, 6-75, 6-76

200, 727-200F, 727C

E. Compliance

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

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

service bulletin mandatory.

Boeing recommends that the inspection given in this service bulletin be done within 72 months after

the original issue date of this service bulletin.

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.

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BOEING SERVICE BULLETIN 727-28-0134
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.

G. Manpower

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

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

man-hour data if necessary. The estimate does not include lost time. These are 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

— Time to find the tools.

OPTION 1: MAN-HOURS FOR GENERAL VISUAL INSPECTION PROCEDURE

Task Number of Persons Task Hours Elapsed Hours More Data

Figure 1 1 1.50 1.50 (a)

Figure 2 1 1.50 1.50 (a)

TOTAL FOR EACH AIRPLANE 3.00 3.00 (a)

(a) Does not include time to defuel/refuel.

OPTION 2: MAN-HOURS FOR ULTRASONIC NON-DESTRUCTIVE TEST (NDT) INSPECTION PROCEDURE

Task Number of Persons Task Hours Elapsed Hours More Data

Figure 1 1 1.00 1.00 (a)

Figure 2 1 1.00 1.00 (a)

TOTAL FOR EACH AIRPLANE 2.00 2.00 (a)

(a) Does not include time to defuel/refuel.

H. Weight and Balance Changes

None

I. Electrical Load Data

Not applicable

J. References

1. Existing Data:

a. Boeing Service Related Problem (SRP) 727-SRP-57-0225

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BOEING SERVICE BULLETIN 727-28-0134
b. Boeing Service Bulletin 727-28-0101

c. Standard Overhaul Practices Manual (SOPM) 20-50-10

d. 727 Aircraft Maintenance Manual (AMM) 28-11-21, 28-23-00

e. 727 Illustrated Parts Catalog (IPC) 57-30-00

f. 727 Non-Destructive Testing (NDT) Manual 727 NDT Part 4, 51-00-00

2. Data supplied with this Service Bulletin:

None.

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

None.

K. Publications Affected

1. Publications:

None.

2. Damage Tolerance Based Structural Inspections:

Boeing has evaluated 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

Refer to Paragraph 2.C., Parts Necessary For Each Airplane, for interchangeability and intermixability

information.

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BOEING SERVICE BULLETIN 727-28-0134
2. MATERIAL INFORMATION

A. Material - Price and Availability

Refer to Paragraph 2.C., Parts Necessary For Each Airplane.

B. Industry Support Information

Boeing warranty remedies are available for 727 airplanes in warranty as of June 19, 2008. For inspection

man-hour reimbursement for airplanes in warranty as of that date, send a warranty claim to Boeing

Warranty & Product Assurance Contracts. If the condition described in this service bulletin is found

during the initial inspection for airplanes in warranty as of that date and additional man-hours or parts

are required, send a warranty claim to Boeing Warranty & Product Assurance Contracts. Warranty

remedies are not available for continued inspections as described in this Service Bulletin as these

actions are considered routine maintenance.

C. Parts Necessary For Each Airplane

1. Kits/Parts:

None

2. Parts and Materials Supplied by the Operator:

Refer to Illustrated Parts Catalog (IPC) 727 IPC 57-30-00.

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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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. 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

4. If the length of any fastener specified in this service bulletin does not meet the

installation standards in SRM Chapter 51, then a fastener of the same specification,

or an approved substitute, with a length which meets the installation standards in

SRM Chapter 51 may be used.

5. A General Visual Inspection is defined as: A visual examination of an interior or

exterior area, installation or assembly to detect obvious damage, failure or irregularity.

This level of inspection is made from within touching distance unless otherwise

specified. A mirror may be necessary to enhance visual access to all exposed surfaces

in the inspection area. This level of inspection is made under normally available

lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may

require removal or opening of access doors or doors. Stands, ladders or platforms

may be required to gain proximity to the area being checked.

6. A Non-Destructive Test (NDT) is an inspection/testing procedure used to determine

the condition of a material in such a manner as to not damage or destroy the material

under investigation. The material is examined for flaws or conditions that could be

detrimental to the integrity of the structure.

7. These work instructions refer to procedures included in 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.

B. WORK INSTRUCTIONS

1. Do a General Visual Inspection or an ultrasonic Non-Destructive Test (NDT) of the left wing fuel

tank access door to make sure that an Impact Resistant Access Door is installed in the correct

location, in accordance with FIGURE 1.

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BOEING SERVICE BULLETIN 727-28-0134
2. If a standard access door is found, replace the standard access door with an Impact Resistant

access door. Refer to 727 AMM 28-11-21 as an accepted procedure.

3. Do a General Visual Inspection of the left wing fuel tank access door to verify stencils and index

markers are applied in accordance with FIGURE 1.

4. If a stencil and/or index marker is missing, apply stencil and/or index marker in accordance with

FIGURE 1.

5. Do a General Visual Inspection or an ultrasonic NDT of the right wing fuel tank access door to

make sure that an Impact Resistant Access Door is installed in the correct location, in accordance

with FIGURE 2.

6. If a standard access door is found, replace the standard access door with an Impact Resistant

access door. Refer to 727 AMM 28-11-21 as an accepted procedure.

7. Do a General Visual Inspection of the right wing fuel tank access door to verify stencils and index

markers are applied in accordance with FIGURE 2.

8. If a stencil and/or index marker is missing, apply stencil and/or index marker in accordance with

FIGURE 2.

9. If one or more access doors were replaced and a leak check has not been done, refuel the

applicable fuel tank and check for leaks. Repair if necessary. Refer to 727 AMM 28-11-21 as an

accepted procedure.

10. Put the airplane back to a serviceable condition.

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BOEING SERVICE BULLETIN 727-28-0134
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 each wing.

FIGURE 1: ACCESS DOOR INSPECTION - LEFT WING

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 727-28-0134
STEP TASK NAME PART NUMBER QTY NOTE

1 Inspect Access Door - 1 (a)

2 Inspect Stencil and Index Marker - - (b)

3 Inspect Stencil - - (b)

4 Inspect Index Marker - - (b)

(a) In accordance with APPENDIX A.

(b) If a stencil and/or index marker is missing, apply stencil and/or index marker with BMS

10-60, Polyurethane Gloss Enamel, matching color to existing stencil and/or index marker.

Refer to SOPM 20-50-10.

FIGURE 1: ACCESS DOOR INSPECTION - LEFT WING

(SHEET 2 OF 2)

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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 each wing.

FIGURE 2: ACCESS DOOR INSPECTION - RIGHT WING

(SHEET 1 OF 2)

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BOEING SERVICE BULLETIN 727-28-0134
STEP TASK NAME PART NUMBER QTY NOTE

1 Inspect Access Door - 1 (a)

2 Inspect Stencil and Index Marker - - (b)

3 Inspect Stencil - - (b)

4 Inspect Index Marker - - (b)

(a) In accordance with APPENDIX A.

(b) If a stencil and/or index marker is missing, apply stencil and/or index marker with BMS

10-60, Polyurethane Gloss Enamel, matching color to existing stencil and/or index marker.

Refer to SOPM 20-50-10.

FIGURE 2: ACCESS DOOR INSPECTION - RIGHT WING

(SHEET 2 OF 2)

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BOEING SERVICE BULLETIN 727-28-0134
Use one of these two procedures to inspect each of the specified access doors.

OPTION 1: GENERAL VISUAL INSPECTION PROCEDURE

1. General Visual Inspection Procedure:

a. Defuel the applicable fuel tank. Refer to 727 AMM 28-23-00 as an accepted procedure.

b. Remove the access door. Refer to 727 AMM 28-11-21 as an accepted procedure.

c. Do a General Visual Inspection of the internal surface of the access door. If the internal surface of the

access door has protruding cast aluminum integral ribs, then the door is a standard access door (Figure

A1). If the internal surface is smooth (no ribs showing), then the door is an impact resistant access

door (Figure A1).

APPENDIX A: PROCEDURE FOR ACCESS DOOR INSPECTION

(SHEET 1 OF 4)

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BOEING SERVICE BULLETIN 727-28-0134
Figure A1

APPENDIX A: PROCEDURE FOR ACCESS DOOR INSPECTION

(SHEET 2 OF 4)

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BOEING SERVICE BULLETIN 727-28-0134
OPTION 2: ULTRASONIC NON-DESTRUCTIVE TEST (NDT) INSPECTION PROCEDURE

1. General:

a. This procedure is permitted with or without fuel in the tanks.

b. Refer to Non-Destructive Test (NDT) Standard Practices Manual 727 NDT Part 4, 51-00-00 as an

accepted procedure.

2. Equipment:

a. Digital thickness gage: Kramer Branson CL300, or equivalent.

b. Aluminum step wedge standard with a range that includes 0.08 to 0.50 inch.

c. A 0.25 inch, 15mhz delay tip or equivalent transducer.

d. Couplant: A low viscosity oil or UT couplant which will not damage the airplane structure.

3. Preparation: Clean fuel tank access door external skin.

4. Calibration: Calibrate the gage between 0.08 and 0.50 inch.

5. Inspection:

a. Along the center line of the long axis, slowly scan the fuel tank access door from one end to the other

end (Figure A2).

b. If a rib is detected and the rib thickness is greater than 0.50 inch, then the door is a standard access

door.

c. If the access door has a thickness between 0.08 and 0.10 inch and no ribs are detected, then the

access door is an impact resistant access door.

APPENDIX A: PROCEDURE FOR ACCESS DOOR INSPECTION

(SHEET 3 OF 4)

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BOEING SERVICE BULLETIN 727-28-0134
Figure A2

APPENDIX A: PROCEDURE FOR ACCESS DOOR INSPECTION

(SHEET 4 OF 4)

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BOEING SERVICE BULLETIN 727-28-0134