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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1333 Original Issue: May 12, 2017 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Lower Chord of Rear Spar and Lower Aft Skin at Wing Buttock Line 157 - 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Unpublished Work.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: May 12, 2017 737-57A1333 1 of 40
4.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 12, 2017 737-57A1333 2 of 40 BOEING SERVICE BULLETIN 737-57A1333
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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:26
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 LOWER AFT SKIN AND LOWER CHORD - WBL 157 - INSPECTION [Group 2]
.32
FIGURE 2: RIGHT WING LOWER AFT SKIN AND LOWER CHORD - WBL 157 - INSPECTION [Group 2]
.35
APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE TABLE 1: LOW FREQUENCY EDDY
CURRENT (LFEC) INSPECTION OF THE LOWER CHORD OF THE REAR SPAR AND
DETAILED INSPECTION OF THE LOWER AFT SKIN ON THE LEFT AND RIGHT WING AT
WBL 157 [Group 2]38
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 12, 2017 737-57A1333 3 of 40 BOEING SERVICE BULLETIN 737-57A1333
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 12, 2017 737-57A1333 4 of 40 BOEING SERVICE BULLETIN 737-57A1333
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-57A1333Original Issue: May 12, 2017 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Lower Chord of Rear Spar and Lower Aft Skin at Wing Buttock Line 157 - 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 that any crack in the lower aft skin and the lower chord of the rear spar at Wing Buttock Line (WBL) 157 is found. If this service bulletin is not done, undetected cracks can lead to the inability of the lower chord of the rear spar, a principal structural element, to sustain limit load which could adversely affect the structural integrity of the airplane.
During a Non-Destructive Test (NDT) open hole inspection, a 737-300 operator found a crack indication in the horizontal flange of the lower chord at WBL157 at 53,481 flight cycles and 66,268 flight hours. The crack was found while accomplishing a splice repair on a new section of web at the left wing rear spar. Boeing has received multiple reports of similar crack findings on airplanes between 63,550 and 69,285 total flight cycles.
Analysis has shown that Main Landing Gear (MLG) loading and braking loads result in cyclic fatigue and local stresses on the structure. Concentrated loading due to the back to back design of the MLG fitting also contributes to the problem.
This service bulletin provides instructions for inspection of the lower aft skin and the lower chord of the rear spar for any crack at WBL 157 to make sure they are found and repaired.
Boeing Service Related Problem (SRP) 737-SRP-57-0306 is related to this service bulletin.
Boeing Fleet Team Digest (FTD) 737 FTD 57-16004 is related to this service bulletin.
This table is provided to operators for planning purposes only. Refer to the applicable sections for more information.
ReferenceAffectedPlanning Data Paragraph 1.A.2., Spares AffectedNoSpares Affected Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: May 12, 2017 737-57A1333 5 of 40
ReferenceAffectedPlanning Data 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 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. 737 Classic airplanes 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:
Do the work that follows on the left and right wing at Wing Buttock Line (WBL) 157:
1. In inspection areas with no existing external repair:
a. Deactivate the trailing edge flaps.
b. Do a Low Frequency Eddy Current (LFEC) inspection of the lower chord of the rear spar for any crack and a detailed inspection of the lower aft skin for any crack. If any crack is found, contact The Boeing Company for repair instructions and do the repair. If no crack is found repeat the inspections.
c. Activate the trailing edge flaps.
2. In inspection areas with an existing external repair, contact The Boeing Company for instructions and do the instruction.
EFFECTIVITY All 737-100/-200/-200C/-300/-400/-500 Airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplane(s).
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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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.
Refer to Paragraph 1.E., Compliance.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection given in this service bulletin.
MANPOWER 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 737-57A1333
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RSS TOO
224.14 UPPER CHORD
MLG SUPPORT BEAM
MAIN LANDING GEAR
SUPPORT BEAM WEB
MAIN LANDING
GEAR SUPPORT LOWER
AFT FITTING CHORD
LOWER AFT SKIN WBL
157.00
IN INSPECTION AREAS WITH NO EXISTING EXTERNAL REPAIR, DO A LOW FREQUENCY
EDDY CURRENT INSPECTION OF THE LOWER CHORD OF THE REAR SPAR FOR CRACKS AND DETAILED INSPECTION OF THE LOWER AFT SKIN FOR CRACKS. IF ANY
CRACK IS FOUND, CONTACT THE BOEING COMPANY FOR REPAIR INSTRUCTIONS AND DO THE REPAIR. IF NO CRACK IS FOUND, REPEAT THE INSTRUCTIONS.
IN INSPECTION AREAS WITH AN EXISTING EXTERNAL REPAIR, CONTACT THE BOEING COMPANY FOR INSTRUCTIONS AND DO THE INSTRUCTION.
MAIN LANDING GEAR 2550885
SUPPORT AFT FITTING Original Issue: May 12, 2017 PROPRIETARY - Copyright © Unpublished Export Controlled ECCN: 9E991 - BOEING 737-57A1333 Work - See page 1 for details. 8 of 40
Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1333 Original Issue: May 12, 2017 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Lower Chord of Rear Spar and Lower Aft Skin at Wing Buttock Line 157 - 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 737-100/200/200C airplanes, line numbers 1-291.-1 737-200/200C/300/400/500, line numbers 292-3132.-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: May 12, 2017 737-57A1333 9 of 40
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.
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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.
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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: May 12, 2017 737-57A1333 12 of 40 BOEING SERVICE BULLETIN 737-57A1333