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.

ECCN: 9E991

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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Unpublished Work.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

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Original Issue: April 16, 2012

Revision 1: June 06, 2012 737-57A1319

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2.0
Export Controlled ECCN: 9E991 - BOEING

PROPRIETARY - Copyright © Unpublished

Work - See page 1 for details.

Original Issue: April 16, 2012

Revision 1: June 06, 2012 737-57A1319

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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

Original Issue: April 16, 2012

Revision 1: June 06, 2012

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

Revision 1: June 06, 2012 737-57A1319

3 of 4
1. 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:

Part Number / Specifica- Qty Name Notes

tion

Corrosion Inhibiting Com- (a)

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

Revision 1: June 06, 2012 737-57A1319

4 of 4

BOEING SERVICE BULLETIN 737-57A1319

ALERT ALERT