AD 91-23-09

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AD Number:
91-23-09
Document Type:
AD Final Rules
Docket Number:
91-NM-199-AD
Subject Heading:
Airworthiness Directives; BOEING Model 747-400 Series Airplanes
Subject:
Electrical Power System
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
11/27/1991
Make:
The Boeing Company
Model:
747-400 Series | 747-400D 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Superseded AD: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Superseded By: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:
Updated RGL applicability to match AD applicability; CAR C-11-185
AIRWORTHINESS DIRECTIVES FINAL RULES: 91-23-09
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   91-NM-199-AD

AMENDMENT:   39-8078

AD NUMBER:   91-23-09

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 747-400 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective November 27, 1991.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
91-23-09 BOEING: Amendment 39-8078. Docket No. 91-NM-199-AD.

Applicability: Model 747-400 series airplanes; line numbers 813 through 845, inclusive; certificated in any category.

Compliance: Required within 20 days after the effective date of this AD, unless previously accomplished.

To prevent fire due to overheated terminals and/or the loss of power to the standby electrical power system, accomplish the following:

(a) Inspect the nuts on terminal strips TD469 and TD470, located in the P180-1 panel, for proper torque of 65 to 75 inch-pounds, in accordance with Boeing Commercial Airplane Group Process Specification BAC 5159, Revision F, dated March 1, 1991. If any nut is found not to have proper torque, prior to further flight, re-torque the nut to 65 to 75 inch-pounds, in accordance with the Boeing Process Specification.

(b) 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.

(c) 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.

(d) The inspection and re-torquing requirements shall be done in accordance with Boeing Commercial Airplane Group Process Specification BAC 5159, Revision F, dated March 1, 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 S.W., Renton, Washington, or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C.

This amendment (39-8078, AD 91-23-09) becomes effective on November 27, 1991.

FOOTER: