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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1328 Original Issue: July 22, 2016 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Inspection of Inspar Upper Skin at Rear Spar, Wing Buttock Line 157 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 © 2016 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Unpublished Work.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: July 22, 2016 737-57A1328 1 of 43
6.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 22, 2016 737-57A1328 2 of 43 BOEING SERVICE BULLETIN 737-57A1328
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected21
B. Concurrent Requirements21
C. Reason21
D. Description22
E. Compliance23
F. Approval25
G. Manpower25
H. Weight and Balance Changes26
I. Electrical Load Data26
J. References26
1. Existing Data:26
2. Data Supplied with this Service Bulletin:27
3. Installation Drawings Used in the Preparation of this Service Bulletin:27
K. Publications Affected27
L. Interchangeability and Intermixability of Parts27
M. Software Accomplishment Summary27
2. MATERIAL INFORMATION29
A. Material - Price and Availability29
B. Industry Support Information29
C. Parts Necessary for Each Airplane29
1. Kits/Parts29
2. Parts and Materials Supplied by the Operator29
3. Parts Modified and Reidentified29
4. Parts Removed and Not Replaced29
D. Parts Necessary to Change Spares29
E. Special Tooling - Price and Availability29
F. Special Tooling Necessary to do this Service Bulletin29
3. ACCOMPLISHMENT INSTRUCTIONS31
A. GENERAL INFORMATION31
B. WORK INSTRUCTIONS32
FIGURE 1: HFEC INSPECTION OF INSPAR UPPER SKIN AT REAR SPAR, WBL 157 [Group 1,
Configuration 1]34
FIGURE 2: HFEC INSPECTION OF INSPAR UPPER SKIN AND REPAIR DOUBLER AT REAR SPAR,
WBL 157 [Group 1, Configuration 2]36
FIGURE 3: HFEC AND LFEC INSPECTION OF INSPAR UPPER SKIN, REPAIR DOUBLER, AND REPAIR
TRIPLER AT REAR SPAR, WBL 157 [Group 1, Configuration 3]38
FIGURE 4: HFEC AND LFEC INSPECTION OF INSPAR UPPER SKIN, REPAIR DOUBLER, AND REPAIR
TRIPLER AT REAR SPAR, WBL 157 [Group 1, Configuration 4]40
APPENDIX A: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 1: EDDY CURRENT
INSPECTION OF THE INSPAR UPPER SKIN AND, IF INSTALLED, THE REPAIR PARTS AT
THE REAR SPAR AT WBL 15742
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 22, 2016 737-57A1328 3 of 43 BOEING SERVICE BULLETIN 737-57A1328
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APPENDIX B: LOGIC DIAGRAM FOR PARAGRAPH 1.E., COMPLIANCE: TABLE 2: EDDY CURRENT
INSPECTION OF THE INSPAR UPPER SKIN AND REPAIR PARTS AT THE REAR SPAR AT
WBL 15743
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 22, 2016 737-57A1328 4 of 43 BOEING SERVICE BULLETIN 737-57A1328
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-57A1328Original Issue: July 22, 2016 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Inspection of Inspar Upper Skin at Rear Spar, Wing Buttock Line 157
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 This service bulletin (SB) gives instructions to do eddy current inspections for any crack in the inspar upper skin area near the rear spar at Wing Buttock Line (WBL) 157. If the eddy current inspections in this service bulletin are not done, a crack in the upper chord and skin can grow undetected and result in the inability of the structure to carry limit load or result in a fuel leak and could prevent a continued safe flight and landing.
While doing SB 737-57A1318 Original Issue, an operator discovered a crack in the inspar upper skin at WBL 157 just forward of the rear spar on the right wing. The crack measured 2.375 inches long. Two additional cracks were found in the skin at two holes common to the rear spar in the same area. Subsequent SB 737-57A1318 Original Issue inspections revealed that the rear spar upper chord was almost completely severed. Further SB 737-57A1318 Original Issue inspections revealed that the left rear spar upper chord was completely severed.
Cracks were also discovered in the rear spar web of both wings. The airplane was a 737-300 with 64,095 flight hours and 51,548 flight cycles. The airplane was within the grace period allowed by SB 737-57A1318 Original Issue. The eddy current inspections in this SB will make sure that there is no undetected crack in the inspar upper skin at the rear spar at WBL 157.
As a result of these findings, SB 737-57A1326 was released as an interim action to address the immediate safety concerns. This service bulletin is a follow-on action to SB 737-57A1326.
Boeing Service Related Problem (SRP) 737-SRP-57-0295 is related to this service bulletin.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 22, 2016 737-57A1328 5 of 43
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 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 Do an eddy current inspection for any crack in the inspar upper skin at the rear spar at WBL 157. If a repair has been installed, do an eddy current inspection for any crack in the repair parts. If any crack is found, do the High-frequency eddy current (HFEC) open hole inspection of the wing in accordance with SB 737-57A1318 Revision 1 and contact The Boeing Company for repair instructions and do the repair.
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 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.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 22, 2016 737-57A1328 6 of 43 BOEING SERVICE BULLETIN 737-57A1328
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BOEING SERVICE BULLETIN 737-57A1328
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MATERIAL INFORMATION None.
LEFT WING SHOWN
RIGHT WING OPPOSITE
DO AN EDDY CURRENT INSPECTION FOR ANY WBL INSPAR UPPER SKIN CRACK IN THE INSPAR UPPER SKIN AT THE 157
FASTENERS INDICATED CONFIGURATION 1 SHOWN, OTHER CONFIGURATIONS SIMILAR 2483290 Original Issue: July 22, 2016 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Et 1O L
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 22, 2016 737-57A1328 8 of 43 BOEING SERVICE BULLETIN 737-57A1328
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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1328 Original Issue: July 22, 2016 ATA System: 5730 SUBJECT: WINGS - Plates/Skin - Inspection of Inspar Upper Skin at Rear Spar, Wing Buttock Line 157
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 737-100, 737-200, 737-200C, 737-300, 737-400, and 737-500 airplanes line numbers 1 to 3132 in 1 Group. 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.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 22, 2016 737-57A1328 9 of 43
DESCRIPTIONCONFIGURATIONGROUP 737-100, 737-200, 737-200C, 737-300, 737-400, and 737-500 airplanes Line Numbers 1 to 3132.
-1 Airplanes that do not have a repair doubler or repair tripler in the inspection area.
1 Airplanes that have a repair doubler in the inspection area common to the rear spar chord fasteners that extends to the aft edge of the inspar skin with the same material, thickness, and profile as repair drawing 65C30105.
2 Airplanes that have a repair tripler and a repair doubler in the inspection area common to the rear spar chord fasteners that extends forward to the adjacent stringer with the same material, thickness, and profile as repair drawing 65C30113.
3 Airplanes that have a repair tripler and a repair doubler in the inspection area common to the rear spar chord fasteners that extends forward to the adjacent stringer and aft to the aft edge of the upper inspar skin with the same material and thickness as repair drawing 65C30113.
4 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 1PG199 1PG201 - PG230 1PG251 - PG255 1PG271 - PG279 1PG301 - PG314 1PG331 - PG332 1PG351 - PG356 1PG375 1PG401 - PG403 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 22, 2016 737-57A1328 10 of 43 BOEING SERVICE BULLETIN 737-57A1328
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GroupVariable Number 1PG431 - PG442 1PG471 - PG475 1PG501 - PG505 1PG571 - PG586 1PG621 - PG630 1PG651 - PG652 1PG701 - PG705 1PH001 1PH011 - PH013 1PH021 - PH024 1PH701 - PH715 1PH731 - PH732 1PH741 - PH743 1PJ001 - PJ009 1PJ031 - PJ032 1PJ071 - PJ072 1PJ101 - PJ119 1PJ201 - PJ219 1PJ301 - PJ302 1PJ551 - PJ561 1PJ601 - PJ615 1PJ811 1PJ816 - PJ817 1PK026 - PK029 1PK041 - PK053 1PK061 - PK070 1PK081 - PK082 1PK091 - PK099 1PK101 - PK103 1PK111 - PK120 1PK141 - PK146 1PK201 - PK204 1PK211 - PK223 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 22, 2016 737-57A1328 11 of 43 BOEING SERVICE BULLETIN 737-57A1328
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GroupVariable Number 1PK231 - PK241 1PK251 - PK258 1PK271 - PK274 1PK281 - PK289 1PK291 1PK301 - PK318 1PK341 1PK351 - PK361 1PK391 1PK431 - PK433 1PK451 - PK452 1PK461 - PK469 1PK495 1PK501 - PK504 1PK511 - PK515 1PK519 1PK521 - PK528 1PK541 - PK565 1PK581 1PK591 - PK599 1PK601 - PK617 1PK621 - PK637 1PK641 - PK642 1PK661 - PK666 1PK671 - PK681 1PK691 - PK697 1PK711 - PK716 1PK731 - PK765 1PK771 - PK779 1PK801 - PK804 1PK819 - PK827 1PK830 1PK861 - PK863 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: July 22, 2016 737-57A1328 12 of 43 BOEING SERVICE BULLETIN 737-57A1328