AD 91-11-11

91-11-11 SHORT BROTHERS: Amendment 39-7009. Docket No. 91-NM-11-AD. Applicability: Model SD3-60 series airplanes, equipped with PT6A-67R engines with Fuel Control Unit (FCU), Part Number (P/N) 3037319, certificated in any category.

Compliance: Required within 30 days after the effective date of this AD, unless previously accomplished.

To prevent the pilot from inadvertently selecting propeller pitch settings below the flight idle setting while in flight, thereby adversely affecting airplane controllability, accomplish the following:

A. Shorten the existing ground/air lever spool spindle P/N SD3-47-1130xA, in accordance with Shorts Service Bulletin SD360-76-11, dated October 1990.

NOTE: This service bulletin references Pratt and Whitney Service Bulletin No. 14017, Revision 1, dated August 16, 1989, for additional instructions.

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, 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 Short Brothers, PLC, 2011 Crystal Drive, Suite 713, Arlington, Virginia 22202-3719. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington.

This amendment (39-7009, AD 91-11-11) becomes effective on July 1, 1991.