AD 92-25-06

92-25-06 BRITISH AEROSPACE: Amendment 39-8421. Docket No. 92-NM-156-AD. Applicability: All Model ATP airplanes, certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent malfunctioning of the stall warning system, accomplish the following:

(a) Within 6 months after the effective date of this AD, accomplish paragraphs (a)(1), (a)(2), and (a)(3) of this AD:

(1) Install a new stall warning lift transducer, part number C74007-4, on the left- and right-hand wing leading edges, in accordance with British Aerospace Service Bulletin ATP-27-41-70031B, Revision 3, dated June 5, 1992.

(2) Increase the wiring cable size for the stall warning heater and the stall warning lift transducer, in accordance with British Aerospace Service Bulletin ATP-24-38-10204A, Revision 2, dated August 14, 1991.

(3) Move the cabin lighting from the essential to the non-essential circuit, in accordance with British AerospaceService Bulletin ATP-33-19-10238A, dated March 19, 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 Maintenance Inspector, 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 installation and modifications shall be done in accordance with the following British Aerospace service bulletins, which contain the specified effectivepages:

Service Bulletin Referenced and Date Page Number Revision Level Shown on Page Date Shown on Page ATP-27-41-70031B, 1 3 June 5, 1992 Revision 3,

June 5, 1992 2 2 May 11, 1992

3, 5, 7 Original October 7, 1991

4, 6 (These pages are not used)

ATP-24-38-10204A, 1-13, 15, 17, 2 August 14, 1991 Revision 2, 19, 21, 23, 25,

August 14, 1991 27, 29, 31, 33,

35, 37, 39, 41,

43, 45-46

Even Pages

14 to 44 (These pages are not used)

ATP-33-19-10238A, 1-5, 7, 9, Original March 19, 1992 March 19, 1992 11, 13, 15,

17, 19, 21,

23, 25, 27

6, 8, 10, 12, (These pages are not used)

14, 16, 18,

20, 22, 24, 26

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, PLC, Librarian for Service Bulletins,P.O. Box 17414, Dulles International Airport, Washington, DC 20041-0414. 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 January 12, 1993.