AD 89-24-07

89-24-07 AEROSPATIALE: Amendment 39-6394. Docket No. 89-NM-126-AD.

Applicability: All Model ATR42 series airplanes, certificated in any category.

Compliance: Required within 60 days after the effective date of this AD, unless previously accomplished.

To improve protection against loss of control when operating in icing conditions, including freezing rain, accomplish the following:

A. Install an anti-icing advisory system in accordance with Aerospatiale Service Bulletins ATR42-27-0021, Revision 8, dated May 2, 1989; ATR42-30-0017, Revision 3, dated January 20, 1989; ATR42-30-0018, Revision 4, dated June 14, 1989; ATR 42-30-0021, Revision 3, dated July 20, 1989; ATR42-30-0024, Revision 1, dated February 13, 1989; and ATR42-30- 0027, Revision 1, dated February 21, 1989.

B. Incorporate Revision 6 of the Airplane Flight Manual (AFM), dated August 1988, into the FAA-approved AFM.

C. An alternate means 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, Northwest Mountain Region.

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

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.

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 Route de Bayonne, 31060 Toulouse, Cedex 03, France. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or the Standardization Branch, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6394, AD 89-24-07) becomes effective on December 15, 1989.