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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1319 Original Issue: April 16, 2012 ATA System: 5752 SUBJECT: WINGS - Trailing Edge Flaps - Outboard Flap, Carriage Spindle - Inspection for Corrosion 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 © 2012 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Unpublished Work.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, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, 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. BOEING is a trademark of Boeing Management Company.
Original Issue: April 16, 2012 737-57A1319 1 of 36
6.0
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: April 16, 2012 737-57A1319 2 of 36 BOEING SERVICE BULLETIN 737-57A1319
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 2 0 B. Concurrent Requirements ...................................... 2 0 C. Reason ................................................ 2 1 D. Description .............................................. 2 1 E. Compliance .............................................. 2 2 F. Approval ............................................... 2 3 G. Manpower .............................................. 2 3 H. Weight and Balance Changes .................................... 2 4 I. Electrical Load Data ......................................... 2 4 J. References .............................................. 2 4
1. Existing Data: ......................................... 2 4
2. Data Supplied with this Service Bulletin: ........................... 2 4
3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 2 4 K. Publications Affected ........................................ 2 5 L. Interchangeability and Intermixability of Parts ........................... 2 5 M. Software Accomplishment Summary ................................ 2 5
2. MATERIAL INFORMATION ........................................ 2 7 A. Material - Price and Availability ................................... 2 7 B. Industry Support Information .................................... 2 7 C. Parts Necessary for Each Airplane ................................. 2 7
1. Kits/Parts ............................................ 2 7
2. Parts and Materials Supplied by the Operator ........................ 2 7
3. Parts Modified and Reidentified ................................ 2 7
4. Parts Removed and Not Replaced .............................. 2 7 D. Parts Necessary to Change Spares ................................. 2 7 E. Special Tooling - Price and Availability ............................... 2 7 F. Special Tooling Necessary to do this Service Bulletin ....................... 2 7
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 2 9 A. GENERAL INFORMATION ..................................... 2 9 B. WORK INSTRUCTIONS ....................................... 3 0 FIGURE 1: LOCATE SUB-ASSEMBLY PART NUMBER FOR CARRIAGES AT WBL 254 AND WBL 355 WITH HVOF THERMAL COATED SPINDLES ........................ 3 3 FIGURE 2: INSPECT SUSPECT CARRIAGE SPINDLES FOR CORROSION ............. 3 5 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: April 16, 2012 737-57A1319 3 of 36 BOEING SERVICE BULLETIN 737-57A1319
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Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: April 16, 2012 737-57A1319 4 of 36 BOEING SERVICE BULLETIN 737-57A1319
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Commercial Airplanes 737 Service Bulletin ALERT SummaryNumber: 737-57A1319Original Issue: April 16, 2012 ATA System: 5752 SUBJECT: WINGS - Trailing Edge Flaps - Outboard Flap, Carriage Spindle - Inspection for Corrosion
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 Boeing has recently received reports of corrosion on outboard flap carriages from four operators, on carriage spindles with less than 7,000 flight cycles. Each of these reports was on carriages with Tungsten-Carbide-Cobalt-Chrome coating applied with High Velocity Oxygenated Fuel (HVOF) on the spindle portion. None were reported to have any fractures. The coating had flaked off the lower surface of the spindle, at the root. A crack in the coating can lead to moisture ingress which may begin corroding the alloy steel base metal. If left unchecked, corrosion pits in this area may create a stress concentration where a crack can start in the base metal resulting in the inability of the carriage to sustain limit load. One fractured carriage spindle can be compensated for by the pilot with inputs to the aileron and or rudder. However fractures of both the inboard and the outboard carriage spindles at the forward end of the spindle through the large diameter (the critical section), on a given outboard flap may preclude continued safe flight and landing of the airplane.
This service bulletin provides instruction to inspect 737-100/-200/-200C/-300/400/500 carriage spindles with High Velocity Oxy-Fuel (HVOF) thermal coating that are installed at WBL 254 and WBL 355 on the outboard trailing edge flaps for corrosion and missing or flaked coating.
Boeing Service Related Problem (SRP) 737-SRP-57-0254 is related to this service bulletin.
ACTION Review your records or do an inspection for the carriage part number to determine if you have any of the suspect carriage sub-assemblies that have Tungsten-Carbide-Cobalt-Chrome coating applied with High Velocity Oxygenated Fuel (HVOF) thermal coating on the spindle. If you determine that you do have suspect carriages with the HVOF thermal coating on the spindle, inspect for missing or flaked coating and/or base metal corrosion and presence of Corrosion Inhibiting Compound (CIC). Do a detailed inspection or a Borescope inspection on the forward end of the spindle, that is forward of the flap front spar. Inspect the HVOF thermal coated spindles in accordance with Paragraph 1.E., Compliance. Remove and replace the corroded carriages with a new or serviceable carriage.
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: April 16, 2012 737-57A1319 5 of 36
The replacement of a carriage that has the suspect HVOF thermal coating on the spindle with one that does not have this HVOF coating, will terminate the inspection in this service bulletin for that carriage only. As an option, the suspect carriage may be reworked into a non-suspect condition. Contact Boeing for additional information. If you determine that your airplane does not have any carriage with the HVOF thermal coating, then there is no further action required.
EFFECTIVITY 737-100, -200, -200C, -300, -400, -500 Airplanes. Refer to Paragraph 1.A.1., Airplanes for the list of affected airplanes.
COMPLIANCE Refer to Paragraph 1.E., Compliance.
The Federal Aviation Administration (FAA) will possibly release another Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the inspection, and/or repair procedures 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.
Original Issue: April 16, 2012 737-57A1319 6 of 36 BOEING SERVICE BULLETIN 737-57A1319
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BOEING SERVICE BULLETIN 737-57A1319
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ACCESS PANE SPINDLE BEARING BEARING
SUPPORT
TRAILING EDGE FLAP I • DO A DETAILED
INSPECTION FOR BASE
CARRIAGE METAL CORROSION IN
SUB-ASSEMBLY THE INDICATED AREA OF
PART NUMBER AND THE CARRIAGE SPINDLES
SERIAL NUMBER ON WITH HVOF THERMAL OLDER CARRIAGES COATING.
OUTBOARD
MIDFLAP
CARRIAGE
AS AN OPTION USE A
BORESCOPE TO INSPECT IN
THE INDICATED AREA OF THE
FORWARD SECTION OF THE
SPINDLE
CARRIAGE SUB-ASSEMBLY
PART NUMBER AND SERIAL
NUMBER LOCATION INSPECTION• AREA 00 2136998 Original Issue: April 16, 2012 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. 7 of 36
Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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Commercial Airplanes 737 Service Bulletin ALERT Number: 737-57A1319 Original Issue: April 16, 2012 ATA System: 5752 SUBJECT: WINGS - Trailing Edge Flaps - Outboard Flap, Carriage Spindle - Inspection for Corrosion
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 737-100, -200, -200C, -300, -400, -500 airplanes.-1 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 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: April 16, 2012 737-57A1319 9 of 36
GroupVariable Number 1PG301 - PG314 1PG331 - PG332 1PG351 - PG356 1PG375 1PG401 - PG403 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 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1PK101 - PK103 1PK111 - PK120 1PK141 - PK146 1PK201 - PK204 1PK211 - PK223 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 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
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GroupVariable Number 1PK771 - PK779 1PK801 - PK804 1PK819 - PK827 1PK830 1PK861 - PK863 1PK871 - PK874 1PK881 - PK884 1PK901 - PK938 1PK971 - PK974 1PL001 - PL028 1PL061 1PL081 1PL101 - PL113 1PL151 1PL171 - PL172 1PL201 - PL203 1PL221 1PL401 - PL417 1PL421 1PL441 1PL451 - PL456 1PL471 1PL491 1PL501 - PL506 1PL551 - PL562 1PL581 1PL601 - PL603 1PL611 1PL621 - PL626 1PL631 - PL632 1PL711 - PL712 1PL716 - PL747 1PL756 Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.
Original Issue: April 16, 2012 737-57A1319 12 of 36 BOEING SERVICE BULLETIN 737-57A1319