78-17-07 PRATT & WHITNEY AIRCRAFT OF CANADA, LIMITED: Amendment 39-3287. Applies to all Pratt & Whitney Aircraft of Canada, Limited PT6A-38, PT6A-41 and PT6A-45A engines and Pratt & Whitney Aircraft PT6A-38 engines with fuel control unit Aviation Electric Part Numbers 3244723-3 through -10, 3244738-5, 3244738-6, 3244752-6 through -10, and 3244755-7 through -11.
Compliance required within the next 100 hours in service, after the effective date of this AD, unless already accomplished.
To preclude rupture of the bypass valve diaphragm in the fuel control unit, replace the part number 2526477 diaphragm with part number 343451 diaphragm in accordance with Paragraph 2, Accomplishment Instructions, in Pratt & Whitney Aircraft of Canada, Limited Service Bulletin No. 3103 or approved equivalent parts and procedure.
Aircraft may be flown to a base for performance of maintenance required by this AD per FAR 21.197.
Any equivalent parts and procedure must be approved by the Chief, Engineering & Manufacturing Branch of the Eastern Region of the Federal Aviation Administration (FAA).
This amendment is effective August 31, 1978.