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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-55A1092 Original Issue: August 07, 2015 ATA System: 5510 SUBJECT: STABILIZERS - Horizontal Stabilizer - Front Spar Chord Lugs - Inspections 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 © 2015 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Unpublished Work.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: August 07, 2015 737-55A1092 1 of 43
3.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected15
B. Concurrent Requirements15
C. Reason15
D. Description15
E. Compliance16
F. Approval18
G. Manpower18
H. Weight and Balance Changes19
I. Electrical Load Data19
J. References19
1. Existing Data:19
2. Data Supplied with this Service Bulletin:19
3. Installation Drawings Used in the Preparation of this Service Bulletin:20
K. Publications Affected20
L. Interchangeability and Intermixability of Parts20
M. Software Accomplishment Summary20
2. MATERIAL INFORMATION21
A. Material - Price and Availability21
B. Industry Support Information21
C. Parts Necessary for Each Airplane21
1. Kits/Parts21
2. Parts and Materials Supplied by the Operator21
3. Parts Modified and Reidentified21
4. Parts Removed and Not Replaced21
D. Parts Necessary to Change Spares21
E. Special Tooling - Price and Availability21
F. Special Tooling Necessary to do this Service Bulletin21
3. ACCOMPLISHMENT INSTRUCTIONS23
A. GENERAL INFORMATION23
B. WORK INSTRUCTIONS25
FIGURE 1: LEFT SIDE HORIZONTAL STABILIZER - FRONT SPAR CHORD LUGS - DETAILED
INSPECTION27
FIGURE 2: RIGHT SIDE HORIZONTAL STABILIZER - FRONT SPAR CHORD LUGS - DETAILED
INSPECTION30
FIGURE 3: LEFT SIDE HORIZONTAL STABILIZER - FRONT SPAR CHORD LUGS - LUG BORE DETAILED
INSPECTION33
FIGURE 4: RIGHT SIDE HORIZONTAL STABILIZER - FRONT SPAR CHORD LUGS - LUG BORE
DETAILED INSPECTION37
APPENDIX A: LOGIC DIAGRAMS FOR COMPLIANCE TASKS AND COMPLIANCE TIMES41
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-55A1092Original Issue: August 07, 2015 ATA System: 5510 SUBJECT: STABILIZERS - Horizontal Stabilizer - Front Spar Chord Lugs - Inspections
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 Between 2004 to 2011, a total of 12 intergranular cracks were reported by in-service airplanes on outboard horizontal stabilizer front spar chord lugs (upper and lower chord). The cracks have been found along the axis of the front spar chord and in the lug faces, lug bores, and lug spot-face surfaces. The stabilizer front spar chords are made from 7075-T6511 extrusion. This material is susceptible to stress corrosion in a corrosive environment where residual machining stresses are present and where the material finish and sealant have degraded. A single joint failure will significantly reduce the remaining fatigue life in the rear spar. A dual failure of the upper and lower front spar joints could cause stabilizer instability, affect controllability of the airplane, and could adversely affect the structural integrity of the airplane.
Boeing Fleet Team Digest (FTD) 737 FTD 55-06002 is related to this service bulletin.
Boeing Service Related Problem (SRP) 737-55-0036 is related to this service bulletin.
ACTION Do a Detailed Inspection and Ultrasonic Inspection on the horizontal stabilizer front spar chord lugs and a Detailed Inspection on the horizontal stabilizer front spar chord lug bores.
1. Repeat Detailed Inspection for corrosion and Ultrasonic Inspection for any crack.
2. Contact The Boeing Company for repair instructions and do the repair.
EFFECTIVITY All 737-300/-400/-500 Airplane(s). 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 inspections 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 737-55A1092
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INSPECTION FOR CRACKS AND CORROSION
ON HORIZONTAL STABILIZER FRONT SPAR
CHORD LUGS 2420153 Original Issue: August 07, 2015 Export Controlled ECCN: 9E991 - BOEING 737-55A1092 PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 43
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: August 07, 2015 737-55A1092 8 of 43 BOEING SERVICE BULLETIN 737-55A1092
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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-55A1092 Original Issue: August 07, 2015 ATA System: 5510 SUBJECT: STABILIZERS - Horizontal Stabilizer - Front Spar Chord Lugs - Inspections
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
DESCRIPTIONCONFIGURATIONGROUP 737-300/400/500-1 Airplane Models:
737-300, 737-400, 737-500 GroupVariable Number 1PJ301 - PJ302 1PJ551 - PJ561 1PJ601 - PJ615 1PJ811 1PJ816 - PJ817 1PM381 - PM399 1PM401 - PM417 1PM541 - PM564 1PP001 - PP054 1PP101 - PP169 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1PP181 - PP199 1PP201 - PP205 1PP221 1PP231 - PP243 1PP281 - PP286 1PP301 - PP305 1PP351 - PP353 1PP376 - PP384 1PP391 - PP393 1PP401 - PP440 1PP471 - PP475 1PP501 - PP522 1PP631 - PP634 1PP651 - PP652 1PP671 - PP699 1PP701 - PP733 1PP771 - PP779 1PP801 - PP808 1PP821 - PP827 1PP831 - PP848 1PP851 - PP852 1PP861 - PP877 1PP891 - PP899 1PP901 - PP936 1PP946 - PP948 1PP951 - PP952 1PP961 - PP967 1PP981 - PP991 1PP993 1PQ001 - PQ016 1PQ026 - PQ041 1PQ051 - PQ092 1PQ101 - PQ199 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1PQ201 - PQ202 1PQ221 - PQ237 1PQ241 - PQ243 1PQ251 - PQ267 1PQ281 - PQ299 1PQ301 - PQ307 1PQ331 - PQ332 1PQ341 - PQ348 1PQ361 - PQ373 1PQ391 - PQ395 1PQ401 - PQ418 1PQ421 1PQ431 - PQ438 1PQ447 - PQ448 1PQ451 1PQ454 1PQ471 - PQ475 1PQ479 - PQ481 1PQ486 - PQ487 1PQ491 - PQ493 1PQ771 - PQ772 1PQ791 - PQ793 1PQ801 - PQ805 1PQ931 - PQ935 1PQ951 1PQ971 - PQ997 1PR001 - PR017 1PR021 - PR034 1PR041 - PR045 1PR061 - PR072 1PR077 - PR082 1PR091 - PR092 1PR096 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1PR101 1PR121 - PR122 1PR131 - PR132 1PR141 - PR143 1PR161 - PR172 1PR181 1PS601 - PS631 1PS636 - PS638 1PS641 - PS644 1PS651 - PS657 1PS666 - PS669 1PS691 - PS692 1PS701 - PS706 1PS751 - PS799 1PS811 1PS836 - PS837 1PS841 - PS846 1PS851 - PS852 1PS856 1PS861 - PS863 1PS866 - PS868 1PS871 - PS874 1PS896 - PS897 1PS901 - PS941 1PS956 - PS957 1PS961 - PS963 1PS971 - PS978 1PT001 - PT015 1PT021 - PT031 1PT041 - PT064 1PT101 - PT105 1PT121 - PT138 1PT146 - PT148 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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