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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1332 Original Issue: January 03, 2017 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Upper Aft Skin at Rear Spar from Wing Buttock Line 80 to 155
- Inspection Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 300-774). 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.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL AND/OR TRADE SECRET Copyright © 2017 Boeing.
Unpublished Work. All Rights Reserved.
Treatment of this document and its content is governed by contract with Boeing. Rights to use this document are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The Boeing Company.
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, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and Boeing liveries 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.
Original Issue: January 03, 2017 737-57A1332 1 of 37
2.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 03, 2017 737-57A1332 2 of 37 BOEING SERVICE BULLETIN 737-57A1332
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected21
B. Concurrent Requirements21
C. Reason21
D. Description21
E. Compliance22
F. Approval24
G. Manpower24
H. Weight and Balance Changes25
I. Electrical Load Data25
J. References25
1. Existing Data:25
2. Data Supplied with this Service Bulletin:25
3. Installation Drawings Used in the Preparation of this Service Bulletin:25
K. Publications Affected26
L. Interchangeability and Intermixability of Parts26
M. Software Accomplishment Summary26
2. MATERIAL INFORMATION27
A. Material - Price and Availability27
B. Industry Support Information27
C. Parts Necessary for Each Airplane27
1. Kits/Parts27
2. Parts and Materials Supplied by the Operator27
3. Parts Modified and Reidentified27
4. Parts Removed and Not Replaced27
D. Parts Necessary to Change Spares27
E. Special Tooling - Price and Availability27
F. Special Tooling Necessary to do this Service Bulletin27
3. ACCOMPLISHMENT INSTRUCTIONS29
A. GENERAL INFORMATION29
B. WORK INSTRUCTIONS30
FIGURE 1: LEFT WING - DETAILED INSPECTION OF THE UPPER AFT SKIN FROM WBL 80 TO WBL
155 [Group 2]32
FIGURE 2: RIGHT WING - DETAILED INSPECTION OF THE UPPER AFT SKIN FROM WBL 80 TO WBL
155 [Group 2]34
APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E. COMPLIANCE: TABLE 1: DETAILED INSPECTION
OF THE UPPER AFT SKIN ON THE LEFT AND RIGHT WING FROM WING BUTTOCK LINE
(WBL) 80 TO 155 [Group 2]36
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 03, 2017 737-57A1332 3 of 37 BOEING SERVICE BULLETIN 737-57A1332
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 03, 2017 737-57A1332 4 of 37 BOEING SERVICE BULLETIN 737-57A1332
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-57A1332Original Issue: January 03, 2017 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Upper Aft Skin at Rear Spar from Wing Buttock Line 80 to 155
- Inspection
THIS DOCUMENT 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 DOCUMENT TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER.
CONCURRENT REQUIREMENTS None.
BACKGROUND Accomplishment of this service bulletin will make sure cracks are found in the upper aft skin of the left and right wing from Wing Buttock Line (WBL) 80 to WBL 155. If this service bulletin is not done, undetected cracks in the upper aft skin can lead to cracks in the rear spar structure. Cracks in the rear spar structure may lead to the inability of a principal structural element to sustain limit load which could adversely affect the structural integrity of the airplane.
An operator of a 737-300 airplane reported finding cracks in the upper aft skin of the right wing at fastener holes along the rear spar upper chord at WBL 125 (crack length 0.045 inch) and at WBL 141 (crack length 0.060 inch).
The cracks originated from fastener holes in the upper aft skin and had not penetrated through the thickness of the skin. The airplane had 68,110 total flight hours and 55,151 total flight cycles. Boeing has received multiple reports of similar crack findings on airplanes between 48,220 and 57,543 total flight cycles.
The root cause of the cracks is identified as the braking loads which introduce a high tension stress in the rear spar upper chord and skin between the main landing gear beam and the side of body for the rear spar chord.
Boeing has determined that the existing inspection programs are not sufficient to find such cracks before they could grow to a critical length.
This service bulletin provides instructions to inspect the upper skin around the area of the rear spar for any crack from WBL 80 to WBL 155 and make sure they are found and repaired before they reach a critical length.
Boeing Service Related Problem (SRP) 737-SRP-57-0301 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 737 FTD 57-16001 is related to this service bulletin.
This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 03, 2017 737-57A1332 5 of 37
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Paragraph 1.E., Compliance and Paragraph
1.F., Approval YesAD Related Paragraph 1.H., Weight and Balance ChangesNoWeight and Balance Change Paragraph 1.I., Electrical Load DataNoElectrical Load Changed Paragraph 1.K., Publications AffectedNoPublications Affected Paragraph 1.K., Publications AffectedNoAirplane Flight Operations Affected (Flight Crew Operations Manual and/or FAA Approved Airplane Flight Manual) Paragraph 2.C.1., Kits/PartsNoKits/Parts Required Paragraph 2.C.2., Parts and Materials Supplied by the Operator NoOperator Supplied Parts/Material Paragraph 2.F., Special Tooling Necessary to do this Service Bulletin NoSpecial Tooling Required ACTION Group 1:
Boeing endorses the new FAA rules related to Limit of Validity (LOV) and recommends immediate and permanent removal from service of any airplanes upon reaching the LOV, whether or not it is operated under FAA jurisdiction.
As such, Boeing no longer provides maintenance instructions for airplanes that have accumulated flight cycles beyond the LOV. Airplanes in Group 1 (line numbers 1-291) have accumulated flight cycles beyond the LOV of the maintenance program. 14 CFR 121.1115 and 129.115 prohibit operation of an airplane beyond its LOV.
Group 2:
Deactivate the trailing edge flap system. Do a detailed inspection for any crack in the upper aft skin from WBL 80 to WBL 155. If any crack is found contact The Boeing Company for repair instructions and do the repair.
Repeat the detailed inspection in the unrepaired area. If no crack is found repeat the detailed inspection. Activate the trailing edge flap system.
EFFECTIVITY All 737-100, 737-200, 737-200C, 737-300, 737-400, and 737-500 airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
COMPLIANCE The Federal Aviation Administration (FAA) will possibly release an additional Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection given in this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 03, 2017 737-57A1332 6 of 37 BOEING SERVICE BULLETIN 737-57A1332
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MANPOWER Elapsed HoursTotal Task HoursAirplanes
4.504.50All Airplanes Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION None.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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BOEING SERVICE BULLETIN 737-57A1332
ALERT ALERT
LEFT WING (RIGHT WING OPPOSITE) WBL
71.24 DO A DETAILED INSPECTION FOR ANY CRACK IN THE UPPER AFT SKIN. IF ANY CRACK IS FOUND, CONTACT 80.00 WBL
THE BOEING COMPANY FOR REPAIR INSTRUCTIONS WBL AND DO THE REPAIR AND REPEAT THE DETAILED 92.50 _ S-5L INSPECTION IN THE UNREPAIRED AREA. IF NO CRACK IS FOUND REPEAT THE DETAILED INSPECTION.
_ S-4L WBL
114.00 . S-3L WBL _ S-2L
135.50 WBL
155.00 _ S-1L WBL
157.00 REAR SPAR A-A INBD • INSPECTION 2528852
• AREA Original Issue: January 03, 2017 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 737-57A1332 Work - See page 1 for details. 8 of 37/
Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1332 Original Issue: January 03, 2017 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Upper Aft Skin at Rear Spar from Wing Buttock Line 80 to 155
- Inspection
THIS DOCUMENT 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 DOCUMENT TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE NEW OWNER.
1. PLANNING INFORMATION A. Effectivity
1. Airplanes This service bulletin is applicable to all 737-100/200/200C/300/400/500 airplanes in 2 Groups. The Variable Numbers and Group Information for the applicable airplanes is given below.
Refer to Service Bulletin Index D6-19567 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
DESCRIPTIONCONFIGURATIONGROUP Airplane line numbers 1 thru 291-1 Airplane line numbers 292 thru 3132-2 Airplane Models:
737-100, 737-200, 737-200C, 737-300, 737-400, 737-500 GroupVariable Number 1PA001 - PA022 1PA099 1PA231 - PA232 1PC001 - PC005 1PG001 - PG075 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 03, 2017 737-57A1332 9 of 37
GroupVariable Number 1PG199 1PG201 - PG230 1PG251 - PG255 1PG271 - PG279 1PG301 - PG314 1PG331 - PG332 1PG351 - PG356 1PG375 1PG401 - PG403 1PG431 - PG442 1PG471 - PG475 1PG501 - PG505 1PG571 - PG583 2PG584 - PG586 1PG621 - PG630 1PG651 - PG652 1PG701 - PG705 2PH001 2PH011 - PH013 2PH021 - PH024 1PH701 - PH715 1PH731 - PH732 1PH741 - PH742 2PH743 1PJ001 - PJ002 2PJ003 - PJ009 1PJ031 - PJ032 1PJ071 - PJ072 1PJ101 - PJ104 2PJ105 - PJ119 2PJ201 - PJ219 2PJ301 - PJ302 2PJ551 - PJ561 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 03, 2017 737-57A1332 10 of 37 BOEING SERVICE BULLETIN 737-57A1332
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GroupVariable Number 2PJ601 - PJ615 2PJ811 2PJ816 - PJ817 2PK026 - PK029 2PK041 - PK053 2PK061 - PK070 2PK081 - PK082 2PK091 - PK099 2PK101 - PK103 2PK111 - PK120 2PK141 - PK146 2PK201 - PK204 2PK211 - PK223 2PK231 - PK241 2PK251 - PK258 2PK271 - PK274 2PK281 - PK289 2PK291 2PK301 - PK318 2PK341 2PK351 - PK361 2PK391 2PK431 - PK433 2PK451 - PK452 2PK461 - PK469 2PK495 2PK501 - PK504 2PK511 - PK515 2PK519 2PK521 - PK528 2PK541 - PK565 2PK581 2PK591 - PK599 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 03, 2017 737-57A1332 11 of 37 BOEING SERVICE BULLETIN 737-57A1332
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GroupVariable Number 2PK601 - PK617 2PK621 - PK637 2PK641 - PK642 2PK661 - PK666 2PK671 - PK681 2PK691 - PK697 2PK711 - PK716 2PK731 - PK765 2PK771 - PK779 2PK801 - PK804 2PK819 - PK827 2PK830 2PK861 - PK863 2PK871 - PK874 2PK881 - PK884 2PK901 - PK938 2PK971 - PK974 2PL001 - PL028 2PL061 2PL081 2PL101 - PL113 2PL151 2PL171 - PL172 2PL201 - PL203 2PL221 2PL401 - PL417 2PL421 2PL441 2PL451 - PL456 2PL471 2PL491 2PL501 - PL506 2PL551 - PL562 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: January 03, 2017 737-57A1332 12 of 37 BOEING SERVICE BULLETIN 737-57A1332