AD 91-23-16

91-23-16 AEROSTAR AIRCRAFT, INC.: Amendment 39-8085. Docket No. 91-CE-34-AD.

Applicability: Model PA60-700P (formerly Piper) airplanes (serial numbers 60-8423001 through 60-8423025), certificated in any category.

Compliance: Required within the next 50 hours time-in-service after the effective date of this AD, unless already accomplished.

NOTE 1: The compliance time in this AD takes precedence over that cited in the referenced service information.

To prevent engine damage that could result from incorrect manifold pressure operations, accomplish the following:

(a) Install placard, part number 87369-77, in accordance with the instructions in Piper Special Advisory No. 60-7, dated January 11, 1991, and operate the airplane accordingly.

NOTE 2: This placard (part number 87369-77) is enclosed in Piper Special Advisory No. 60-7, dated January 11, 1991, which may be obtained from the manufacturer at the address in paragraph (e) of this AD.

(b) Insert Report VB-1220, Revision 4, dated December 14, 1990, into the limitations section of the PA-60-700P Pilot's Operating Handbook and operate the airplane in accordance with these limitations.

NOTE 3: Copies of Report VB-1220, Revision 4, dated December 14, 1990, may be obtained from the manufacturer at the address in paragraph (e) of this AD.

(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) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Seattle Aircraft Certification Office, 1601 Lind Avenue, S.W., Renton, Washington 98055-4056. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Seattle Aircraft Certification Office.

(e) The installation required by this AD shall be done in accordance with Piper Special Advisory No. 60-7, dated January 11, 1991. 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 Aerostar Aircraft, Inc., 3608 S. Davison Boulevard, Spokane, Washington 99204. Copies may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 1100 L Street, NW, Room 8401, Washington, DC.

This amendment (39-8085, AD 91-23-16) becomes effective on December 20, 1991.