AD 91-09-12

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AD Number:
91-09-12
Document Type:
AD Final Rules
Docket Number:
90-NM-245-AD
Subject Heading:
Airworthiness Directives; BOEING Model 737-300, 737-400, and 737-500 Series Airplanes
Subject:
Fire Extinguishing Wiring
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
05/28/1991
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Superseded AD: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Superseded By: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: 91-09-12
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   90-NM-245-AD

AMENDMENT:   39-6976

AD NUMBER:   91-09-12

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

ACTION:  

SUMMARY:  

DATES:   Effective May 28, 1991.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
91-09-12 BOEING: Amendment 39-6976. Docket No. 90-NM-245-AD.

Applicability: All Model 737-300, 737-400, and 737-500 series airplanes, certificated in any category.

Compliance: Required within the next 36 months after the effective date of this AD, unless previously accomplished.

To preclude cross connection of the engine fire extinguishing wiring and plumbing during maintenance, accomplish the following:

A. For airplanes listed in Boeing Service Bulletin 737-26-1067, dated June 28, 1990: Modify the engine fire extinguishing system wiring and plumbing in accordance with the service bulletin. Accomplishment of this modification constitutes terminating action for the repetitive inspections and functional tests required by Airworthiness Directive 89-03-51, Amendment 39-6213, on Boeing Model 737-300, 737-400, and 737-500 airplanes following maintenance on the engine fire extinguishing wiring and plumbing.

B. For airplanes line position 1890 and subsequent on which PRR 34774 or an equivalent modification was incorporated during production: The repetitive inspections and functional tests required by Airworthiness Directive 89-03-51, Amendment 39-6213, are terminated.

C. 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.

D. 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.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington.

This amendment (39-6976, AD 91-09-12) becomes effective on May 28, 1991.

FOOTER: