### Commercial **Airplanes** 

# 737 Service Bulletin **ALERT Number: 737-57A1319**  Original Issue: April 16, 2012 Revision 1: June 06, 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.9E991 ECCN: 

## 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 Unpublished Work.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, DreamlinerTM, 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2012 737-57A1319 Revision 1: June 06, 2012 1 of 4 2.0Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 16, 2012 737-57A1319 Revision 1: June 06, 2012 2 of 4 **BOEING SERVICE BULLETIN 737-57A1319 ALERT**  **ALERT**

BLANK PAGE

### Commercial **Airplanes** 

# 737 Service Bulletin **ALERT Short Form Revision**  **Number: 737-57A1319** Original Issue: April 16, 2012 Revision 1: June 06, 2012 ATA System: 5752 **SUBJECT:**WINGS - Trailing Edge Flaps - Outboard Flap, Carriage Spindle - Inspection for Corrosion Revision 1 is sent to change information. Only the changed information is described below. The Original Issue and Revision 1 are necessary to do the service bulletin. **COMPLIANCE INFORMATION RELATED TO THIS REVISION** No more work is necessary if work already performed per the previous revision of subject Service Bulletin (SB). **REASON FOR REVISION** This revision is sent to correct the Corrosion Inhibiting Compound (CIC) callouts. **REVISION HISTORY** April 16, 2012 Original Issue: June 06, 2012 Revision 1:
**EFFECTIVITY** 737-100/-200/-200C/-300/-400/-500 Refer to Paragraph 1.A.1., Airplanes, in Service Bulletin 737-57A1319, Original Issue, for the list of affected airplanes. **APPROVAL** This service bulletin was examined by the Federal Aviation Administration (FAA). The changes specified in this service bulletin comply with the applicable regulations and are FAA approved, as well as European Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved airplanes listed in the service bulletin effectivity. This service bulletin and its approval were based on the airplane in its original Boeing delivery configuration or as modified by other approved Boeing changes. If an airplane has a non-Boeing modification or repair that affects a component or system also affected by this service bulletin, the operator is responsible for obtaining appropriate regulatory agency approval before incorporating this service bulletin. **EXISTING INFORMATION** The following are the existing information in the SB:

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 16, 2012 737-57A1319 Revision 1: June 06, 2012 3 of 41. Paragraph 2.C.2., Material Information - Parts Necessary for Each Airplane - Parts and Materials Supplied by the Operator:
None. 2. Paragraph 3.B.6.a., Work Instructions: If no indication of missing or flaked coating or base metal corrosion is found, the carriage does not need to be disassembled or removed. Perform a detailed inspection for Corrosion Inhibiting Compound (CIC) coverage in accordance with FIGURE 2. If CIC does not cover the inspection area, apply BMS3-27 or BMS3-25 CIC to the indicated section, in accordance with FIGURE 2. Refer to SOPM 20-41-05 as an accepted procedure. **CHANGED INFORMATION** The following are the changed information in the SB: 1. Paragraph 2.C.2., Material Information - Parts Necessary for Each Airplane - Parts and Materials Supplied by the Operator:
**Notes Name**  **Qty Part Number / Specifica-**  **tion** (a) Corrosion Inhibiting Com- pound - BMS3-23 (a) See the Qualified Products List at the end of the Boeing Material Specification (BMS) for supplier data. BMS3-35 optional.

2. Paragraph 3.B.6.a, Work Instructions: If no indication of missing or flaked coating or base metal corrosion is found, the carriage does not need to be disassembled or removed. Perform a detailed inspection for Corrosion Inhibiting Compound (CIC) coverage in accordance with FIGURE 2. If CIC does not cover the inspection area, apply BMS3-23 or BMS3-35 CIC to the indicated section, in accordance with FIGURE 2. Refer to SOPM 20-41-05 as an accepted procedure.

Export Controlled ECCN: 9E991 - BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details. Original Issue: April 16, 2012 737-57A1319 Revision 1: June 06, 2012 4 of 4 **BOEING SERVICE BULLETIN 737-57A1319 ALERT**  **ALERT**