AD 93-21-05

93-21-05 AEROSPATIALE: Amendment 39-8719. Docket 93-NM-54-AD.

Applicability: Model ATR42-200 and -300 series airplanes, serial numbers 3 through 179 inclusive; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent a severe out-of-trim condition, which could lead to reduced controllability of the airplane, accomplish the following:

(a) Within 6 months after the effective date of this AD, modify the autopilot disengagement wiring located at shelf 82VU, in accordance with Aerospatiale Service Bulletin ATR42-22-0012, dated April 2, 1990; or Revision 1, dated October 12, 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 modification shall be done in accordance with Aerospatiale Service Bulletin ATR42-22-0012, dated April 2, 1990; or Aerospatiale Service Bulletin ATR42-22-0012, Revision 1, dated October 12, 1992. Revision 1 of Aerospatiale Service Bulletin ATR42-22-0012 contains the following list of effective pages:

Page Number Revision Level Shown on Page Date Shown on Page 1-4, 7-8 1 October 12, 1992 5-6 Original April 2, 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 Aerospatiale, 316 Route de Bayonne, 31060 Toulouse, Cedex 03, France. 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 December 13, 1993.