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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
Amendment 39-1581; AD 68-09-01 R1

PRATT & WHITNEY AIRCRAFT Model Wasp, Jr. and R-985 Type Engines


Preamble Information

Regulatory Information
68-09-01 PRATT & WHITNEY AIRCRAFT: Amendment 39-591 as amended by Amendment 39-1581. Applies to Wasp, Jr., and R-985 Type Engines.
Compliance required as indicated:
To prevent further propeller blade failures as the result of excessive wear of the engine crankshaft flyweight and flyweight liners, accomplish the following:
(a) For engines operated with Hartzell propeller models HC-93Z30, HC-B3Z30, and HC-B3W30.
(1) With 1,150 hours' or more time in service after the last engine overhaul, within the next 50 hours' time in service after the effective date of this AD and thereafter at intervals not to exceed 1,200 hours' time in service from the last engine overhaul, replace the two engine crankshaft flyweight liners P/N 34461 with two new engine crankshaft flyweight liners P/N 34461; inspect and rework or replace engine crankshaft flyweights P/N's 34462 and 34463 in accordance with Pratt & Whitney Aircraft Service Bulletin No. 1758 Revision A dated November 18, 1964, or later FAA approved revision;
(2) With less than 1,150 hours' time in service after the last engine overhaul accomplish the procedures of (a)(1) above prior to the accumulation of 1,200 hours' time in service after the last engine overhaul and thereafter at intervals not to exceed 1,200 hours' time in service from the last engine overhaul.
(b) Engines operated with a combination of Hartzell propellers models HC-93Z30, HC-B3Z30, or HC- B3W30 and any other eligible propeller in excess of 1,150 hours' time in service since last engine overhaul must have engine flyweight liners replaced and the engine crankshaft flyweights inspected, reworked or replaced as required by paragraph (a)(1).
(c) For engines operated with any other eligible propellers:
(1) Engines with more than 1,550 hours' time in service after the last engine overhaul, within the next 50 hours' time in service after the effective date of this AD and thereafter at intervals not to exceed 1,600 hours' time in service from the last engine overhaul, replace the two engine crankshaft flyweight liners P/N 34461 with two new engine crankshaft flyweight liners P/N 34461, inspect and rework or replace engine crankshaft flyweights P/N's 34462 and 34463 in accordance with Pratt & Whitney Aircraft Service Bulletin No. 1758 Revision A dated November 18, 1964, or later FAA approved revision.
(2) Engines with less than 1,550 hours' time in service after the last engine overhaul, accomplish the procedures of (c)(1) above prior to the accumulation of 1,600 hours' time in service after the last engine overhaul and thereafter at intervals not to exceed 1,600 hours' time in service from the last engine overhaul.
(d) Upon submission of substantiating data through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA Eastern Region may adjust the repetitive inspection intervals specified in this AD.
(e) This supersedes AD 65-07-02.
Amendment 39-591 became effective May 26, 1968.
This Amendment 39-1581 becomes effective January 17, 1973.


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