AD 91-21-13

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AD Number:
91-21-13
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; BOEING Model 737-300, -400, and -500 Series Airplanes
Subject:
Fuel Shutoff Cable Pulley Bracket
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
11/29/1991
Make:
The Boeing Company
Model:
737-300 Series | 737-400 Series | 737-500 Series
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 91-21-13
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-8060

AD NUMBER:   91-21-13

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 737-300, -400, and -500 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective November 29, 1991.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
91-21-13 BOEING: Amendment 39-8060. Docket 91-NM-80-AD. Supersedes AD's 89-13-05 and 89-23-05.

Applicability: Model 737-300, -400, and -500 series airplanes, listed in Boeing Service Bulletin 737-76-1023, dated February 14, 1991, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To minimize the potential for cable separation due to the Number 2 engine throttle cable chafing against the right wing front spar bracket, and to prevent Number 1 and Number 2 engine throttle control cable ratcheting feedback, accomplish the following:

A. For Model 737-300 series airplanes: Prior to the accumulation of 300 flight hours after July 24, 1989 (the effective date of Amendment 39-6240), unless previously accomplished within the previous 700 flight hours, and thereafter at intervals not to exceed 1,000 flight hours, gain access to the fuel shutoff cable pulley bracket near the right wing front spar station 124 and inspect the number two engine throttle cable for wear. Replace the cable, before further flight, if cable wear exceeds acceptable wear limits specified in Section 20-20-31 of the Model 737 Maintenance Manual.

B. For Model 737-400 series airplanes: Prior to the accumulation of 300 flight hours after November 27, 1989 (the effective date of Amendment 39-6367), unless previously accomplished within the previous 700 flight hours, and thereafter at intervals not to exceed 1,000 flight hours, gain access to the fuel shutoff cable pulley bracket near the right wing front spar station 124 and inspect the number two engine throttle cable for wear. Replace the cable, before further flight, if cable wear exceeds acceptable wear limits specified in Section 20-20-31 of the Model 737 Maintenance Manual.

C. For all airplanes: Within 36 months after the effective date of this AD, modify the engine throttle control cable system in accordance with Boeing Service Bulletin 737-76-1023, dated February 14, 1991. This modification constitutes terminating action for the repetitive inspections required by paragraphs A. and B. of this AD.

D. An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Seattle ACO.

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

F. The inspections and modifications shall be done in accordance with Boeing Service Bulletin 737-76-1023, dated February 14, 1991. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. Copies may be inspected at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington; or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, D.C.

Airworthiness Directive 91-21-13 supersedes AD 89-13-05, Amendment 39-6240; and AD 89-23-05, Amendment 39-6367.
This amendment (39-8060, AD 91-21-13) becomes effective on November 29, 1991.

FOOTER: