Commercial 

Airplanes 737

Service Bulletin

Number: 737-53-1312

Original Issue: October 21, 2011

Revision 1: March 14, 2012

ATA System: 5331

SUBJECT: FUSELAGE - Skin - Chem-mill Steps in Crown Skins at Specified Locations - Inspection

and Modification

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BOEING SERVICE BULLETIN 737-53-1312

BLANK PAGE
Commercial 

Airplanes 737

Service Bulletin

Short Form Revision Number: 737-53-1312

Original Issue: October 21, 2011

Revision 1: March 14, 2012

ATA System: 5331

SUBJECT: FUSELAGE - Skin - Chem-mill Steps in Crown Skins at Specified Locations - Inspection

and Modification

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 on the airplane(s) changed in accordance with the original issue of this service

bulletin.

REASON FOR REVISION

This revision is sent to revise compliance times for airplanes which have incorporated Boeing Business Jet

(BBJ) Lower Cabin Altitude Supplemental Type Certificate (STC) ST01697SE as referenced in Boeing Service

Bulletin 737-21-1149.

REVISION HISTORY

Original Issue: October 21, 2011

Revision 1: March 14, 2012

EFFECTIVITY

737-900/-900ER Airplanes. Refer to Paragraph 1.A.1., Airplanes, in the original issue of this service bulletin 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.

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Revision 1: March 14, 2012 737-53-1312

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EXISTING INFORMATION

No existing information.

CHANGED INFORMATION

The following is the changed information in the service bulletin:

In Paragraph 1.E., Compliance, a paragraph is added as follows:

"For airplanes which have incorporated Boeing Business Jet (BBJ) Lower Cabin Altitude Supplemental Type

Certificate (STC) ST01697SE (6500 feet maximum cabin altitude in lieu of 8000 feet) as referenced in Boeing

Service Bulletin 737-21-1149, the flight cycle related compliance times are different from those specified in this

service bulletin. All initial compliance times (thresholds) specified in flight cycles must be reduced to half of those

specified in this service bulletin. All repeat interval compliance times specified in flight cycles must be reduced

to one-quarter of those specified in this service bulletin."

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Original Issue: October 21, 2011

Revision 1: March 14, 2012 737-53-1312

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BOEING SERVICE BULLETIN 737-53-1312