AD 87-02-05 R1

87-02-05 R1 BOEING: Amendment 39-5501 as amended by Amendment 39-5675. Applies to Boeing Models 727, 737-100, and 737-200 series airplanes, equipped with hydraulic system "B" Abex P/N 57186 pump motor, certificated in any category. Compliance required as indicated, unless previously accomplished.

To prevent a hydraulic system "B" Abex P/N 57186 pump motor internal wiring fault from burning a hole in the case and igniting the escaping hydraulic fluid, which could ignite fuel leakage, accomplish the following:

A. Within the next 300 hours time in service after the effective date of this AD, unless already accomplished within the last 700 hours time in service, and thereafter at intervals not to exceed 1,000 hours time in service, accomplish 1. or 2., below, as applicable:

1. Perform a visual inspection of the cavity drain system components in the left wing-body fairing area for fuel leakage in all Model 727 series airplanes in accordance with Boeing Service Bulletin 727-29-A52, dated October 22, 1976, or later FAA-approved revision. Any evidence of leakage or conditions that could lead to leakage, must be corrected prior to further flight in accordance with approved maintenance procedures.

2. Perform a visual inspection of all fuel system components and associated plumbing installed in the main wheel wells of all Model 737 series airplanes in accordance with Boeing Service Bulletin 737-29-A1033, dated October 22, 1976, or later FAA-approved revisions. Inspect for evidence of leakage, damage, and security of installations. Any evidence of leakage or conditions that could lead to leakage, must be corrected prior to further flight in accordance with approved maintenance procedures.

B. Within the next 1,000 hours time in service after the effective date of this AD, and thereafter at intervals not to exceed 1,000 hours time in service, accomplish a pressure leakage check of cavity drain system components in the left wing-body fairing area inall Model 727 series airplanes in accordance with Boeing Service Bulletin 727-29-A52, dated October 22, 1976, or later FAA-approved revisions.

C. Prior to February 2, 1988, either:

1. Install the ground fault protection systems in the hydraulic system "B" Abex pump motor electric power circuits in accordance with Boeing Service Bulletin 727-29-47, Revision 2, dated October 8, 1976, or Boeing Service Bulletin 737-29-1029, Revision 2, dated October 8, 1976, as applicable, or later FAA-approved revisions; or

2. Install the hydraulic "B" system motor driven pumps, either new or upgraded, in accordance with Boeing Service Bulletin 727-29-55 dated April 30, 1980, or Boeing Service Bulletin 737-29-1036, dated April 30, 1980, as applicable, or later FAA-approved revisions.

This action constitutes terminating action for the repetitive inspection requirements of paragraphs A. and B., above.

D. An alternate means of compliance or adjustment of compliance time, which providean acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.

E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to the Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

Amendment 39-5501 became effective February 2, 1987, and superseded AD 76-22-08.

This amendment, 39-5675, becomes effective August 21, 1987.