AD 93-16-11

93-16-11 BRITISH AEROSPACE: Amendment 39-8669. Docket 93-NM-33-AD. Applicability: Model 146-100A, -200A, and -300A series airplanes; equipped with Hosiden Besson Limited "Cybertone" smoke warning horns; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent a fire in the lavatory from not being discovered and extinguished promptly, accomplish the following:

(a) Within 5 months after the effective date of this AD, modify the smoke warning horns for the forward and aft lavatory smoke detectors in accordance with British Aerospace Modification Service Bulletin SB.26-32-36128A, dated April 30, 1992.

(b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal MaintenanceInspector, who may add comments and then send it to the Manager, Standardization Branch, ANM-113.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113.

(c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(d) The modification shall be done in accordance with British Aerospace Modification Service Bulletin SB.26-32-36128A, dated April 30, 1992. 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 British Aerospace, Inc., Avro Division, 22070 Broderick Drive, Sterling, Virginia 20166. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(e) This amendment becomes effective on October 13, 1993.