### Commercial **Airplanes** 

# 737 Service Bulletin **Number: 737-28-1286** Original Issue: January 10, 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. 9E991 ECCN: 

## BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2012 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter.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. 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 Boeing livery are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 1 of 41 11.0BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 2 of 41 **BOEING SERVICE BULLETIN 737-28-1286**

BLANK PAGE**Table of Contents** Summary...................................................... 5 1. PLANNING INFORMATION........................................ 9 A. Effectivity................................................ 9 1. Airplanes............................................. 9 2. Spares Affected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 B. Concurrent Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 C. Reason. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 D. Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 F. Approval. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 H. Weight and Balance Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 I. Electrical Load Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 J. References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1. Existing Data:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2. Data supplied with this Service Bulletin:. . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3. Installation Drawings Used in the Preparation of this Service Bulletin:. . . . . . . . . . . 19 K. Publications Affected. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 L. Interchangeability and Intermixability of Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2. MATERIAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 B. Industry Support Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 C. Parts Necessary For Each Airplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2. Parts and Materials Supplied by the Operator:. . . . . . . . . . . . . . . . . . . . . . . . 21 3. Parts Modified and Reidentified:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4. Parts Removed and Not Replaced:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 D. Parts Necessary to Change Spares. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 F. Special Tooling Necessary to do this Service Bulletin. . . . . . . . . . . . . . . . . . . . . . . 22 3. ACCOMPLISHMENT INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 A. GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 B. WORK INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 FIGURE 1: ACCESS DOOR INSPECTION - LEFT WING [Group 1]. . . . . . . . . . . . . . . . . . . 26 FIGURE 2: ACCESS DOOR INSPECTION - RIGHT WING [Group 1]. . . . . . . . . . . . . . . . . . 28 FIGURE 3: ACCESS DOOR INSPECTION - LEFT WING [Group 2]. . . . . . . . . . . . . . . . . . . 30 FIGURE 4: ACCESS DOOR INSPECTION - RIGHT WING [Group 2]. . . . . . . . . . . . . . . . . . 32 FIGURE 5: ACCESS DOOR INSPECTION - LEFT WING [Group 3]. . . . . . . . . . . . . . . . . . . 34 FIGURE 6: ACCESS DOOR INSPECTION - RIGHT WING [Group 3]. . . . . . . . . . . . . . . . . . 36 APPENDIX A: GENERAL VISUAL INSPECTION PROCEDURE [Group 1-2]. . . . . . . . . . . . . . . . 38 APPENDIX B: GENERAL VISUAL INSPECTION PROCEDURE [Group 3]. . . . . . . . . . . . . . . . . 40

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 3 of 41 **BOEING SERVICE BULLETIN 737-28-1286**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 4 of 41 **BOEING SERVICE BULLETIN 737-28-1286**

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### Commercial **Airplanes** 

# 737 Service Bulletin **Summary Number: 737-28-1286**  Original Issue: January 10, 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) 737-SRP-57-0225 is related to this service bulletin. **ACTION** Identify the Wing Fuel Tank Access Doors. Do a General Visual Inspection 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** 737-100/200/200C/300 Airplanes. Refer to Paragraph 1.A.1, Effectivity. **COMPLIANCE** Refer to Paragraph 1.E., Compliance.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 5 of 41**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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 6 of 41 **BOEING SERVICE BULLETIN 737-28-1286**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 7 of 41 **BOEING SERVICE BULLETIN 737-28-1286**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 8 of 41 **BOEING SERVICE BULLETIN 737-28-1286**

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### Commercial **Airplanes** 

# 737 Service Bulletin **Number: 737-28-1286** Original Issue: January 10, 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.
**DESCRIPTION CONFIGURATION**  **GROUP** All 737-100/200/200C airplanes Line Number 1 though 1456.

- 1 737-200 airplane Line Number 1486.

- 2 All 737-300 airplanes Line Number 1001 through 1505, and 1508.

- 3

Airplane Models: 737-100, 737-200, 737-200C, 737-300 **Group Variable Number**  1 PA001 - PA022 1 PA099 1 PA231 - PA232 1 PC001 - PC005 1 PG001 - PG075 1 PG199 1 PG201 - PG230 1 PG251 - PG255 1 PG271 - PG279

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 9 of 41**Group Variable Number**  1 PG301 - PG314 1 PG331 - PG332 1 PG351 - PG356 1 PG375 1 PG401 - PG403 1 PG431 - PG442 1 PG471 - PG475 1 PG501 - PG505 1 PG571 - PG586 1 PG621 - PG630 1 PG651 - PG652 1 PG701 - PG705 1 PH001 1 PH011 - PH013 1 PH021 - PH024 1 PH701 - PH715 1 PH731 - PH732 1 PH741 - PH743 1 PJ001 - PJ009 1 PJ031 - PJ032 1 PJ071 - PJ072 1 PJ101 - PJ119 1 PJ201 - PJ219 1 PK026 - PK029 1 PK041 - PK053 1 PK061 - PK070 1 PK081 - PK082 1 PK091 - PK099 1 PK101 - PK103 1 PK111 - PK120 1 PK141 - PK146 1 PK201 - PK204 1 PK211 - PK223

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 10 of 41 **BOEING SERVICE BULLETIN 737-28-1286 Group**  **Variable Number** 1 PK231 - PK241 1 PK251 - PK258 1 PK271 - PK274 1 PK281 - PK289 1 PK291 1 PK301 - PK318 1 PK341 1 PK351 - PK361 1 PK391 1 PK431 - PK433 1 PK451 - PK452 1 PK461 - PK469 1 PK495 1 PK501 - PK504 1 PK511 - PK515 1 PK519 1 PK521 - PK527 1 PK541 - PK565 1 PK581 1 PK591 - PK599 1 PK601 - PK617 1 PK621 - PK637 1 PK641 - PK642 1 PK661 - PK666 1 PK671 - PK681 1 PK691 - PK697 1 PK711 - PK716 1 PK731 - PK765 1 PK771 - PK779 1 PK801 - PK804 1 PK819 - PK827 1 PK830 1 PK861 - PK863

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 11 of 41 **BOEING SERVICE BULLETIN 737-28-1286 Group**  **Variable Number** 1 PK871 - PK874 1 PK881 - PK884 1 PK901 - PK938 1 PK971 - PK974 1 PL001 - PL028 1 PL061 1 PL081 1 PL101 - PL113 1 PL151 1 PL171 - PL172 1 PL201 - PL203 1 PL221 1 PL401 - PL417 1 PL421 1 PL441 1 PL451 - PL456 1 PL471 1 PL491 1 PL501 - PL506 1 PL551 - PL562 1 PL581 1 PL601 - PL603 1 PL611 1 PL621 - PL625 1 PL631 - PL632 1 PL711 - PL712 1 PL716 - PL747 1 PL756 1 PL758 1 PL761 - PL770 1 PL781 - PL788 1 PL793 1 PL801 - PL803

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 12 of 41 **BOEING SERVICE BULLETIN 737-28-1286 Group**  **Variable Number** 1 PM001 - PM006 1 PM016 - PM017 1 PM021 - PM023 1 PM051 - PM066 1 PM101 - PM119 1 PM141 - PM142 1 PM171 1 PM181 1 PM251 - PM255 1 PM281 - PM283 1 PN001 - PN002 1 PN021 - PN043 1 PN081 - PN086 1 PN101 - PN117 1 PN131 - PN163 1 PN401 - PN420 1 PN431 - PN433 1 PN451 - PN456 1 PN471 - PN472 1 PN481 1 PN491 - PN492 2 PN493 1 PN501 1 PN511 3 PP001 - PP042 3 PP101 - PP126 3 PP161 - PP169 3 PP181 - PP189 3 PP201 - PP204 3 PP221 3 PP231 - PP243 3 PP281 - PP286 3 PP301 - PP305

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 13 of 41 **BOEING SERVICE BULLETIN 737-28-1286 Group**  **Variable Number** 3 PP351 - PP352 3 PP376 - PP384 3 PP401 - PP431 3 PP471 - PP475 3 PP501 - PP504 3 PP521 - PP522 3 PP631 - PP634 3 PP651 - PP652 3 PP671 - PP699 3 PP701 - PP727 3 PP771 - PP777 3 PP801 - PP804 3 PP821 - PP827 3 PP831 - PP836 3 PP846 - PP848 3 PP851 3 PP861 - PP870 3 PP891 - PP899 3 PP901 - PP909 3 PP931 - PP934 3 PP946 - PP948 3 PP951 - PP952 3 PP961 - PP965 3 PP981 - PP982 3 PP991 3 PQ001 - PQ012 3 PQ026 - PQ037 3 PQ051 - PQ065 3 PQ086 - PQ089 3 PQ101 - PQ118 3 PQ231 - PQ232 3 PQ241 - PQ242 1 PX071

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 14 of 41 **BOEING SERVICE BULLETIN 737-28-1286 Group**  **Variable Number** 1 PX701 1 PY001 - PY008 1 PY021 - PY022 1 PY031 1 PY036 - PY037 1 PY046 - PY048 1 PY051 - PY053 1 PY056 - PY057 1 PY101 - PY103 1 PY111 - PY113 1 PY131 - PY135 1 PY141 - PY143 1 PY151 - PY154 1 PY156 - PY157 1 PY161 - PY162 1 PY166 1 PY191 1 PY201 1 PY221 - PY222 1 PY231 1 PY241 - PY244 1 PY270 - PY275 1 PY281 1 PY286 1 PY301 - PY304 1 PY321 - PY323 1 PY341 - PY346 1 PY361 - PY362 1 PY381 1 PY401 1 PY409 - PY411 1 PY421 - PY422 1 PY441

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 15 of 41 **BOEING SERVICE BULLETIN 737-28-1286 Group**  **Variable Number** 1 PY451 1 PY461 - PY463 1 PY591 - PY595 1 PY611 - PY612 1 PY621 1 PY631 1 PY651 1 PY671 - PY672 1 PY721 1 PY741 2. Spares Affected None. **B. Concurrent Requirements** The service bulletins listed below must be done before or at the same time as this service bulletin: **Description Service Bulletin**  **Company** Fuel tank access door replacement 737-28A1064 Revision 3 Boeing Fuel tank access door replacement 737-28A1070 Original Issue through Revision 2 Boeing Fuel tank access door replacement 737-28A1078 Revision 1 through Revision 2 Boeing Fuel tank access door replacement 737-28-1081 Revision 1 Boeing
**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) 737-SRP-57-0225 is related to this service bulletin.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 16 of 41 **BOEING SERVICE BULLETIN 737-28-1286 D. Description**  Identify the Wing Fuel Tank Access Doors. Do a General Visual Inspection 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. **Group 1:**
**Affected Maintenance Zones Zone**  **Model** 3-5, 4-5 737-100, 737-200, 737-200C **Group 2:**
**Affected Maintenance Zones Zone**  **Model** 3-5, 4-5 737-200 **Group 3:**
**Affected Maintenance Zones Zone**  **Model** 305, 405 737-300 **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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 17 of 41 **BOEING SERVICE BULLETIN 737-28-1286**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. **Group 1: MAN-HOURS FOR GENERAL VISUAL INSPECTION PROCEDURE** 
**More Data Elapsed Hours**  **Task Hours Number of Persons**  **Task** (a) 4.0 4.0 1 Figure 1 (a) 4.0 4.0 1 Figure 2 (a) 8.0 8.0 TOTAL FOR EACH AIRPLANE (a) Does not include time to defuel/refuel. **Group 2: MAN-HOURS FOR GENERAL VISUAL INSPECTION PROCEDURE** 
**More Data Elapsed Hours**  **Task Hours Number of Persons**  **Task** (a) 2.0 2.0 1 Figure 3 (a) 2.0 2.0 1 Figure 4 (a) 4.0 4.0 TOTAL FOR EACH AIRPLANE (a) Does not include time to defuel/refuel. **Group 3: MAN-HOURS FOR GENERAL VISUAL INSPECTION PROCEDURE** 
**More Data Elapsed Hours**  **Task Hours Number of Persons**  **Task** (a) 1.50 1.50 1 Figure 5 (a) 1.50 1.50 1 Figure 6 (a) 3.0 3.0 TOTAL FOR EACH AIRPLANE (a) Does not include time to defuel/refuel.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 18 of 41 **BOEING SERVICE BULLETIN 737-28-1286 H. Weight and Balance Changes**  None **I. Electrical Load Data** Not applicable **J. References** 1. Existing Data: a. Boeing Service Bulletin 737-28-1081, 737-28A1064, 737-28A1070, 737-28A1078 b. Boeing Service Related Problem (SRP) 737-SRP-57-0225 c. Standard Overhaul Practices Manual (SOPM) 20-50-10 d. 737-100/200 Aircraft Maintenance Manual (AMM) 28-11-11, 28-23-0 e. 737-100/200 Illustrated Parts Catalog (IPC) 57-30-00 f. 737-300/400/500 Aircraft Maintenance Manual (AMM) 28-11-11, 28-23-00 g. 737-300/400/500 Illustrated Parts Catalog (IPC) 28-11-11 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 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** Refer to Paragraph 2.C., Parts Necessary For Each Airplane, for interchangeability and intermixability information.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 19 of 41 **BOEING SERVICE BULLETIN 737-28-1286**BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 20 of 41 **BOEING SERVICE BULLETIN 737-28-1286**

BLANK PAGE**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 737 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: **Group 1:** Refer to Illustrated Parts Catalog (IPC) 737-100/200 IPC 57-30-00. **Group 2:** Refer to Illustrated Parts Catalog (IPC) 737-100/200 IPC 57-30-00. **Group 3:** Refer to Illustrated Parts Catalog (IPC) 737-300/400/500 IPC 28-11-11. 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

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 21 of 41 **BOEING SERVICE BULLETIN 737-28-1286 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.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 22 of 41 **BOEING SERVICE BULLETIN 737-28-1286 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. 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. **Group 1:** Do a General Visual Inspection of the left wing fuel tank access doors to make sure that Impact Resistant Access Doors are installed in the correct locations, in accordance with FIGURE 1.
2. **Group 1:** If one or more standard access doors are found, replace each standard access door with an Impact Resistant access door. Refer to 737-100/200 AMM 28-11-11 as an accepted procedure.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 23 of 41 **BOEING SERVICE BULLETIN 737-28-1286**3. **Group 1:** Do a General Visual Inspection of the left wing fuel tank access doors to verify stencils and index markers are applied in accordance with FIGURE 1.
4. **Group 1:** If a stencil and/or index marker is missing, apply stencil and/or index marker in accordance with FIGURE 1.
5. **Group 1:** Do a General Visual Inspection of the right wing fuel tank access doors to make sure that Impact Resistant Access Doors are installed in the correct locations, in accordance with FIGURE 2. 6. **Group 1:** If one or more standard access doors are found, replace each standard access door with an Impact Resistant access door. Refer to 737-100/200 AMM 28-11-11 as an accepted procedure.
7. **Group 1:** Do a General Visual Inspection of the right wing fuel tank access doors to verify stencils and index markers are applied in accordance with FIGURE 2. 8. **Group 1:** If a stencil and/or index marker is missing, apply stencil and/or index marker in accordance with FIGURE 2. 9. **Group 2:** Do a General Visual Inspection of the left wing fuel tank access doors to make sure that Impact Resistant Access Doors are installed in the correct locations, in accordance with FIGURE 3. 10. **Group 2:** If one or more standard access doors are found, replace each standard access door with an Impact Resistant access door. Refer to 737-100/200 AMM 28-11-11 as an accepted procedure.
11. **Group 2:** Do a General Visual Inspection of the left wing fuel tank access doors to verify stencils and index markers are applied in accordance with FIGURE 3.
12. **Group 2:** If a stencil and/or index marker is missing, apply stencil and/or index marker in accordance with FIGURE 3. 13. **Group 2:** Do a General Visual Inspection of the right wing fuel tank access doors to make sure that Impact Resistant Access Doors are installed in the correct locations, in accordance with FIGURE 4.
14. **Group 2:** If one or more standard access doors are found, replace each standard access door with an Impact Resistant access door. Refer to 737-100/200 AMM 28-11-11 as an accepted procedure. 15. **Group 2:** Do a General Visual Inspection of the right wing fuel tank access doors to verify stencils and index markers are applied in accordance with FIGURE 4.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 24 of 41 **BOEING SERVICE BULLETIN 737-28-1286**16. **Group 2:** If a stencil and/or index marker is missing, apply stencil and/or index marker in accordance with FIGURE 4.
17. **Group 1-2:** 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 737-100/200 AMM 28-11-11 as an accepted procedure. 18. **Group 3:** Do a General Visual Inspection of the left wing fuel tank access doors to make sure that Impact Resistant Access Doors are installed in the correct locations, in accordance with FIGURE 5. 19. **Group 3:** If one or more standard access doors are found, replace each standard access door with an Impact Resistant access door. Refer to 737-300/400/500 AMM 28-11-11 as an accepted procedure. 20. **Group 3:** Do a General Visual Inspection of the left wing fuel tank access doors to verify stencils and index markers are applied in accordance with FIGURE 5.
21. **Group 3:** If a stencil and/or index marker is missing, apply stencil and/or index marker in accordance with FIGURE 5.
22. **Group 3:** Do a General Visual Inspection of the right wing fuel tank access doors to make sure that Impact Resistant Access Doors are installed in the correct locations, in accordance with FIGURE 6. 23. **Group 3:** If one or more standard access doors are found, replace each standard access door with an Impact Resistant access door. Refer to 737-300/400/500 AMM 28-11-11 as an accepted procedure.
24. **Group 3:** Do a General Visual Inspection of the right wing fuel tank access doors to verify stencils and index markers are applied in accordance with FIGURE 6. 25. **Group 3:** If a stencil and/or index marker is missing, apply stencil and/or index marker in accordance with FIGURE 6. 26. **Group 3:** 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 737-300/400/500 AMM 28-11-11 as an accepted procedure. 27. Put the airplane back to a serviceable condition.

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 25 of 41 **BOEING SERVICE BULLETIN 737-28-1286 This Figure applies only to: Group 1.** 

**FIGURE 1: ACCESS DOOR INSPECTION - LEFT WING (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 26 of 41 **BOEING SERVICE BULLETIN 737-28-1286**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.
**NOTE QTY**  **PART NUMBER NAME**  **TASK STEP**  (a) 6
- Access Door Inspect 1 (b)

- - Stencil and Index Marker Inspect 2 (b)

- - Stencil Inspect 3 (b)

- - Index Marker Inspect 4 (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)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 27 of 41 **BOEING SERVICE BULLETIN 737-28-1286 This Figure applies only to: Group 1.** 

**FIGURE 2: ACCESS DOOR INSPECTION - RIGHT WING (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 28 of 41 **BOEING SERVICE BULLETIN 737-28-1286**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.
**NOTE QTY**  **PART NUMBER NAME**  **TASK STEP**  (a) 6
- Access Door Inspect 1 (b)

- - Stencil and Index Marker Inspect 2 (b)

- - Stencil Inspect 3 (b)

- - Index Marker Inspect 4 (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)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 29 of 41 **BOEING SERVICE BULLETIN 737-28-1286 This Figure applies only to: Group 2.** 

**FIGURE 3: ACCESS DOOR INSPECTION - LEFT WING (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 30 of 41 **BOEING SERVICE BULLETIN 737-28-1286**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.
**NOTE QTY**  **PART NUMBER NAME**  **TASK STEP**  (a) 3
- Access Door Inspect 1 (b)

- - Stencil and Index Marker Inspect 2 (b)

- - Stencil Inspect 3 (b)

- - Index Marker Inspect 4 (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 3: ACCESS DOOR INSPECTION - LEFT WING (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 31 of 41 **BOEING SERVICE BULLETIN 737-28-1286 This Figure applies only to: Group 2.** 

**FIGURE 4: ACCESS DOOR INSPECTION - RIGHT WING (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 32 of 41 **BOEING SERVICE BULLETIN 737-28-1286**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.
**NOTE QTY**  **PART NUM**  **BER NAME**  **TASK STEP** 

(a) 3
- Access Door Inspect 1 (b)

- - Stencil and Index Marker Inspect 2 (b)

- - Stencil Inspect 3 (b)

- - Index Marker Inspect 4 (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 4: ACCESS DOOR INSPECTION - RIGHT WING (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 33 of 41 **BOEING SERVICE BULLETIN 737-28-1286 This Figure applies only to: Group 3.** 

**FIGURE 5: ACCESS DOOR INSPECTION - LEFT WING (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 34 of 41 **BOEING SERVICE BULLETIN 737-28-1286**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.
**NOTE QTY**  **PART NUMBER NAME**  **TASK STEP**  (a) 2
- Access Door Inspect 1 (b)

- - Stencil and Index Marker Inspect 2 (b)

- - Stencil Inspect 3 (b)

- - Index Marker Inspect 4 (a) In accordance with APPENDIX B. (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 5: ACCESS DOOR INSPECTION - LEFT WING (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 35 of 41 **BOEING SERVICE BULLETIN 737-28-1286 This Figure applies only to: Group 3.** 

**FIGURE 6: ACCESS DOOR INSPECTION - RIGHT WING (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 36 of 41 **BOEING SERVICE BULLETIN 737-28-1286**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.
**NOTE QTY**  **PART NUMBER NAME**  **TASK STEP**  (a) 2
- Access Door Inspect 1 (b)

- - Stencil and Index Marker Inspect 2 (b)

- - Stencil Inspect 3 (b)

- - Index Marker Inspect 4 (a) In accordance with APPENDIX B. (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 6: ACCESS DOOR INSPECTION - RIGHT WING (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 37 of 41 **BOEING SERVICE BULLETIN 737-28-1286 This Appendix applies only to: Group 1-2.**  1. Defuel the applicable fuel tank. Refer to 737-100/200 AMM 28-23-0 as an accepted procedure. 2. Remove the access door. Refer to 737-100/200 AMM 28-11-11 as an accepted procedure. 3. Do a General Visual Inspection of the internal surface of the access door. If the door ends are flat, then the door is an impact resistant access door (Figure A1). If the internal surface of the access door has protruding cast aluminum integral ribs or the door ends are smooth, then the door is a standard access door (Figure A1).

**APPENDIX A: GENERAL VISUAL INSPECTION PROCEDURE (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 38 of 41 **BOEING SERVICE BULLETIN 737-28-1286**Figure A1

**APPENDIX A: GENERAL VISUAL INSPECTION PROCEDURE (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 39 of 41 **BOEING SERVICE BULLETIN 737-28-1286 This Appendix applies only to: Group 3.**  1. Defuel the applicable fuel tank. Refer to 737-300/400/500 AMM 28-23-00 as an accepted procedure. 2. Remove the access door. Refer to 737-300/400/500 AMM 28-11-11 as an accepted procedure. 3. Do a General Visual Inspection of the internal surface of the access door. If the door ends are flat, then the door is an impact resistant access door (Figure B1). If the internal surface of the access door has protruding cast aluminum integral ribs or the door ends are smooth, then the door is a standard access door (Figure B1).

**APPENDIX B: GENERAL VISUAL INSPECTION PROCEDURE (SHEET 1 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 40 of 41 **BOEING SERVICE BULLETIN 737-28-1286**Figure B1

**APPENDIX B: GENERAL VISUAL INSPECTION PROCEDURE (SHEET 2 OF 2)** 

BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: January 10, 2012 737-28-1286 41 of 41 **BOEING SERVICE BULLETIN 737-28-1286**