AD 91-14-06

91-14-06 AEROSPATIALE: Amendment 39-7047. Docket No. 91-NM-39-AD.

Applicability: Model ATR42 series airplanes, Serial Numbers 3 though 157; and ATR72 series airplanes, Serial Numbers 126 through 150; certificated in any category.

Compliance: Required within 180 days after the effective date of this AD, unless previously accomplished.

To prevent loss of nose wheel steering, accomplish the following:

A. Modify the nose landing gear steering selector valve in accordance with Messier- Hispano-Bugatti Service Bulletin 631-32-036, Revision 1, dated May 14, 1990; and Aerospatiale Service Bulletin ATR42-32-0025, Revision 1 dated January 15, 1990, or Revision 2, dated January 30, 1991, or Aerospatiale Service Bulletin ATR72-32-1001, dated April 25, 1990, as applicable.

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, Standardization Branch, ANM-113,FAA, Transport Airplane Directorate.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PI), who may concur or comment and then send it to the Manager, Standardization Branch, ANM-113.

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.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Aerospatiale, 316 Rue de Bayonne, 31060 Toulouse, Cedex 03, France. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington.

This amendment (39-7047, AD 91-14-06) becomes effective on July 29, 1991.