AD 91-21-03

91-21-03 MCDONNELL DOUGLAS: Amendment 39-8050. Docket No. 91-NM-74-AD.

Applicability: Model DC-9 series airplanes, listed in Heath Tecna Service Bulletin ESCI-25-A1, dated April 30, 1990, certificated in any category.

Compliance: Required within 18 months after the effective date of this AD, unless previously accomplished.

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

(a) Visually inspect the electrical wiring along the left and right overhead stowage compartment rail assemblies in the vicinity of each electrical bonding strap for evidence of arcing, burning, or chafing. If damage is found, prior to further flight, repair in accordance with McDonnell Douglas DC-9 Maintenance Manual, Chapters 20-50-01 and 20-50-02.

(b) Modify the electrical bonding strap installation of the left and right overhead stowage compartment rail assemblies in accordance with Heath Tecna Aerospace Co. Alert Service Bulletin ESCI-25-A1, dated April 30, 1990.

(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.

(e) The modification requirements of this rule shall be done in accordance with Heath Tecna Aerospace Company Alert Service Bulletin ESCI-25-A1, dated April 30, 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 Heath Tecna Aerospace Company, 19819 84th Avenue South, Kent, Washington 98032. 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 (39-8050, AD 91-21-03) becomes effective on November 29, 1991.