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June 19, 2003 Revision 1: March 26, 2007 737-53A1204 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 1 of 69

ALERT ALERT Commercial Airplane Group 737

ALERTALERT Service Bulletin Number: 737-53A1204 Date: June 19, 2003 Revision 1: March 26, 2007 ATA System: 5311 SUBJECT: FUSELAGE - Main Frame - Frames and Bulkheads - Body Station BS 360 - BS 348.2 and BS 303.9 - BS 294.5 Stringers S-7L - S-16L Left Intercostal Inspection / Repair / Modification

BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2003 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.

This document includes proprietary information owned by The Boeing Company and/or one or more third parties. Treatment of the document and the information it contains is governed by contract with Boeing. For more information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124.

Boeing, 707, 717, 727, 737, 747, 757, 767, 777, BBJ, BOEING BUSINESS JET, DC-8, DC-9, DC-10, MD-10, MD-11, MD-80, MD-90, the Boeing logo and the Boeing livery are among the trademarks owned by Boeing or its subsidiaries. No intellectual property license (express or implied) is granted in connection with this document or otherwise.

BLANK PAGE June 19, 2003 Revision 1: March 26, 2007 737-53A1204 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 2 of 69 BOEING SERVICE BULLETIN 737-53A1204

ALERT ALERT

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Table of Contents June 19, 2003 Revision 1: March 26, 2007 737-53A1204 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 3 of 69 BOEING SERVICE BULLETIN 737-53A1204

ALERT ALERT

Table of Contents Revision Transmittal Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1. PLANNING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 A. Effectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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

2. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 B. Concurrent Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 C. Reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 D. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 E. Compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 F. Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 G. Manpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 H. Weight and Balance Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 I. Electrical Load Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 J. References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

1. Existing Data: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

2. Data supplied with this Service Bulletin: . . . . . . . . . . . . . . . . . . . . . . . . . 53

3. Installation Drawings Used in the Preparation of this Service Bulletin: . . . . . . . . . . 53 K. Publications Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 L. Interchangeability and Intermixability of Parts . . . . . . . . . . . . . . . . . . . . . . . . . 53

2. MATERIAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 A. Material - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 B. Industry Support Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 C. Parts Necessary For Each Airplane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

1. Kits/Parts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

2. Parts and Materials Supplied by the Operator: . . . . . . . . . . . . . . . . . . . . . . 55

3. Parts Modified and Reidentified: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

4. Parts Removed and Not Replaced: . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 D. Parts Necessary to Change Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 E. Special Tooling - Price and Availability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 F. Special Tooling Necessary to do this Service Bulletin . . . . . . . . . . . . . . . . . . . . . 55

3. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 A. GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 B. WORK INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 FIGURE 1: INTERCOSTAL WEB, ATTACHMENT CLIP, STRAP, STRINGER, STRINGER SPLICE CHANNEL AND ’H’ STRAP - INSPECTION - GROUP 1 PASSENGER AIRPLANES . . 62 FIGURE 2: INTERCOSTAL WEB, ATTACHMENT CLIP, STRAP, STRINGER AND ’H’ STRAP - INSPECTION - GROUP 2 CARGO AIRPLANES . . . . . . . . . . . . . . . . . . . . . 66

Table of Contents June 19, 2003 Revision 1: March 26, 2007 737-53A1204 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 4 of 69 BOEING SERVICE BULLETIN 737-53A1204

ALERT ALERT

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June 19, 2003 Revision 1: March 26, 2007 737-53A1204 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 5 of 69

ALERT ALERT Commercial Airplane Group 737

ALERTALERT Service Bulletin Number: 737-53A1204 Revision Transmittal Sheet Date: June 19, 2003 Revision 1: March 26, 2007 ATA System: 5311 SUBJECT: FUSELAGE - Main Frame - Frames and Bulkheads - Body Station BS 360 - BS 348.2 and BS 303.9 - BS 294.5 Stringers S-7L - S-16L Left Intercostal Inspection / Repair / Modification This Revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION More work is necessary on airplanes changed as shown in the initial release of this service bulletin. The repeat inspection intervals in the compliance paragraph have been changed.

REASON FOR REVISION This revision is sent to:

— Change the Service Bulletin status from "Special Attention" to "Alert" and add reference to the related Airworthiness Directive (AD).

— Planning Information - Change the repeat inspection intervals in the Compliance paragraph. Update the service history information relating to cracks that have been reported since the original release of this service bulletin. Add the reference to the Service Related Problem. Update the Structural Repair Manual (SRM) references in the Publications Affected and References paragraphs. Update the Aircraft Maintenance Manual (AMM) references in the References paragraph.

— Accomplishment Instructions - Update the SRM references for the stringer S-16L repair. Update the AMM references for the lavatory removal/installation. Added Part 4 to the Work Instructions to inspect intercostals aft of the forward entry door on cargo airplanes.

The data given in Information Notice 737-53-1204 IN 01 is included in this revision. The incorrect SRM figure number has been changed to the correct figure number.

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

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

Pages with no vertical lines have no important changes.

June 19, 2003 Revision 1: March 26, 2007 737-53A1204 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 6 of 69 BOEING SERVICE BULLETIN 737-53A1204

ALERT ALERT

REVISION HISTORY Original Issue: June 19, 2003 Revision 1: March 26, 2007

June 19, 2003 Revision 1: March 26, 2007 737-53A1204 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 69

ALERT ALERT Commercial Airplane Group 737

ALERTALERT Service Bulletin Number: 737-53A1204 Summary Date: June 19, 2003 Revision 1: March 26, 2007 ATA System: 5311 SUBJECT: FUSELAGE - Main Frame - Frames and Bulkheads - Body Station BS 360 - BS 348.2 and BS 303.9 - BS 294.5 Stringers S-7L - S-16L Left Intercostal Inspection / Repair / Modification

THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.

CONCURRENT REQUIREMENTS None

BACKGROUND Several operators have reported airplanes with fatigue cracks in the intercostals on the forward and aft side of the forward entry door. The cracks are caused by fatigue from pressure loads applied at door stop fittings.

Incorporation of this service bulletin will prevent a possible decompression and unscheduled down time.

Prior to the original release of this service bulletin, eleven operators had reported airplanes with fatigue cracks in the intercostal web at body station (BS) 358.5 and stringer (S)-16 left. The cracks extend from the inboard edge of the intercostal through tooling or fastener holes and terminate at the 2.0 inch diameter lightening hole.

Three operators had reported four airplanes with cracks in intercostals at S-11L, S-12L and S-13L on the forward and aft side of the forward entry door. All additional cracks were in the radius of return flanges of the webs and attachment clips. One operator had reported one airplane with cracks in the stringer splice channels at S-14L and S-15L on the aft side of the forward entry door. The cracks were in the intercostal web attachment flange at the aft end of the intercostal.

Since the original release of this service bulletin, many operators have reported over one hundred cracks.

Cracks have been found at all doorstop and hinge support intercostals on both the forward and aft side of the forward entry door. Operators have also reported cracks on several airplanes at multiple intercostal locations.

The Federal Aviation Administration (FAA) has issued Airworthiness Directive (AD) 2005-20-03 which requires incorporation of this service bulletin.

Boeing Structural Item Interim Advisory (SIIA) 737-183 is related to this service bulletin.

Boeing Service Related Problem (SRP) 737-SRP-53-0266 is related to this service bulletin.

June 19, 2003 Revision 1: March 26, 2007 737-53A1204 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 8 of 69

ACTION The airplane effectivity is divided in two groups. Group 1 is for passenger airplanes and Group 2 is for cargo airplanes.

For Group 1 passenger airplanes gain access to stringer S-7L - S-16L intercostals forward of the forward entry door (BS 303.9 - BS 294.5) and aft of the forward entry door (BS 360 - BS 348.2).

For Group 2 cargo airplanes gain access to stringer S-7L - S-16L intercostals forward of the forward entry door (BS 303.9 - BS 294.5) and aft of the forward entry door (BS 360 - BS 348.2).

Inspect the intercostal webs, attachment clips, straps, stringers and stringer splice channels for cracks. Refer to Part 1 and Part 2 for Group 1 passenger airplanes and Part 3 and Part 4 for Group 2 cargo airplanes. If cracks are found at S-16L aft of the forward entry door between BS 360 and BS 351.2 for group 1 airplanes, repair as given in Accomplishment Instructions. If cracks or damage is found at any other stringer locations contact Boeing for repair instructions.

Repeat inspections of the intercostals forward and aft of the forward entry door as required in Section 1.E.

Compliance of this service bulletin.

EFFECTIVITY All 737-100/200/200C/300/400/500 series airplanes divided into two groups. Group 1 is for passenger airplanes and Group 2 is for the cargo airplanes.

COMPLIANCE See Section 1.E. Compliance for Boeing recommended compliance times and inspection intervals.

INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of September 11, 1997. Please refer to Paragraph 2.B., Industry Support Information.

MANPOWER See table in Section 1.G. Manpower for man-hour estimate.

MATERIAL INFORMATION None.

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ALERT ALERT

INBD FWD CRACK

TYPICAL CRACK

TYPICAL BS 360 S-16L S-7L FWD S-7L BS

351.20 360 BS S-16L INBD

259.5 277 BS303.9 BS BS

294.5 BS AREA

DOOR FRAME AND AT BS 348.2 TO BS 360 FOR GROUP 1 AND GROUP 2 AT BS 294.5 TO BS 303.9 FOR GROUP 1 AND GROUP 2

AROUND THE FORWARD ENTRY DOOR INSPECT INTERCOSTALS AT S-7L THRU S-16L

TYPICAL CRACKS-

ATTACHMENT CLIPS

ADDTIONAL CRACKS ARE IN

BEND RADIUS OF RETURN

FLANGES OF THE WEBS AND HOLE

TOOLING

CLIP FRAME STRAP SKIN STRINGER S-16L

INTERCOSTAL WEB

351.20 BS

ENTRY DOOR

FORWARD V83943

June 19, 2003 Revision 1: March 26, 2007 737-53A1204 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 10 of 69 BOEING SERVICE BULLETIN 737-53A1204

ALERT ALERT

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June 19, 2003 Revision 1: March 26, 2007 737-53A1204 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 11 of 69

ALERT ALERT Commercial Airplane Group 737

ALERTALERT Service Bulletin Number: 737-53A1204 Date: June 19, 2003 Revision 1: March 26, 2007 ATA System: 5311 SUBJECT: FUSELAGE - Main Frame - Frames and Bulkheads - Body Station BS 360 - BS 348.2 and BS 303.9 - BS 294.5 Stringers S-7L - S-16L Left Intercostal Inspection / Repair / Modification

THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH 1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.

1. PLANNING INFORMATION A. Effectivity

1. Airplanes Refer to Service Bulletin Index Document D6-19567, Part 3 for Airplane Variable Number, Line Number, and Serial Number data.

Airplane models:

737-100 737-200 737-200C 737-300 737-400 737-500

IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER AAR A/C ENG. SALES & LEASING (AFD) 1 PP189 PP198 PP205 PP435 PP732 PP936 PS668 PW526

GROUP CONFIGURATION DESCRIPTION 1 - All 737-100/200/300/400/500 series passenger airplanes.

2 - All 737-200C series cargo airplanes.

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ADAM AIR (DAM) 1 PK528 PK820 PK824 PK974 PM556 PN405 PP508 PP840 PP964 PQ281 PU301 PW009 PW011 PW061 PW091–PW092 PW119 PW562

ADC AIRLINES (ADN) 1 PJ118–PJ119 PN033–PN034 AEGEAN AIRLINES S.A. (CRM) 1 PM392 PR028 PR030 PS601 PS608 PS961 PW002 PW046 PW053 PW157 PW261 PW276 PW289 PW502 PW564

AERGO CAPITAL LIMITED (CLJ) 1 PK462 PK468 PK772 2 PY031

AERO CONTRACTORS OF NIGERIA (NCC) 1P Q 1 9 4 P Q 1 9 6

AERO CONTROLS (AEO) 1P G 3 1 2 P G 6 2 9

AERO NUSANTARA INDONESIA (NOK) 1 PL504

AEROCONDOR (EDR) 1 PK901 PL401 PN491

AEROFLOT-DON (DAU) 1 PT513–PT514

AEROGAL/GALAPAGOS AIRLINES (ERG) 1 PK715 PK827 PL102 PL110 PL171 PL624–PL625 PN030

AEROLINEAS ARGENTINAS (ARG) 1 PG584–PG585 PH705–PH708 PH741–PH743 PK102–PK103 PK735–PK737 PK739–PK740 PK747 PK750–PK751 PK755 PK757 PK761 PK763 PK765 PN112–PN113 PP948 PT042 PT044–PT045 PT047 PT303–PT306 PT309 PT509–PT510 2 PY007 AEROLINEAS AUSTRAL CHILE S.A. (LUT) 1 PL405 PM141–PM142

AEROSERVICE (SRI) 1 PL742–PL743

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