AD 91-23-10

91-23-10 BOEING: Amendment 39-8079. Docket No. 91-NM-109-AD.

Applicability: Model 747-400 series airplanes, listed in Boeing Alert Service Bulletin 747-23A2241, Revision 3, dated September 5, 1991, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent the occurrence of smoke and fire in the passenger cabin, accomplish the following:

(a) Within 12 months after the effective date of this AD, accomplish the following on the main and upper decks:

(1) Inspect the advanced cabin entertainment and service system (ACESS) wire bundle installation at the dado panel near each sidewall disconnect for chafing and wear in accordance with Boeing Alert Service Bulletin 747-23A2241, Revision 3, dated September 5, 1991.

(i) If chafing or wear is found, prior to further flight, repair or replace the ACESS cable and install teflon expandable sleeving in accordance with the service bulletin.

(ii) If no chafing or wear is found, install teflon expandable sleeving on the ACESS cable in accordance with the service bulletin.

(2) Inspect all advanced cabin entertainment and service system (ACESS) seat to seat cables for chafing and wear in accordance with Boeing Alert Service Bulletin 747- 23A2241, Revision 3, dated September 5, 1991.

(i) If chafing or wear is found, prior to further flight, repair or replace the ACESS cable, and ensure proper installation in accordance with the service bulletin.

(ii) If no chafing or wear is found, ensure proper cable installation in accordance with the service bulletin.

(3) Modify the ACESS wire bundle installation at the dado panel near each sidewall disconnect in accordance with Boeing Alert Service Bulletin 747-23A2241, Revision 3, dated September 5, 1991.

(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 inspections, repairs, and modifications shall be done in accordance with Boeing Alert Service Bulletin 747-23A2241, Revision 3, dated September 5, 1991, which contains the following list of effective pages:

Page Number Revision Level Date 1, 4-7, 10, 14-16, 24-26

3 September 5, 1991 2, 3, 8-9, 11-13, 17-23 2 November 1, 1990

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 (39-8079, AD 91-23-10) becomes effective on January 7, 1992.