65-12-03 MOONEY: Amdt. 39-74 Part 39 Federal Register May 28, 1965. Applies to Model M20E Aircraft, Serial Numbers 101 through 722 Equipped with Hartzell Propeller, HC-C2YK/7666-2 or CHC-C2YK/7666-2.
Compliance required within the next 25 hours' time in service after the effective date of this AD unless already accomplished.
To avoid continuous propeller operation in the speed range where vibration stresses are high, accomplish the following:
(a) Add the following operating limitation to the Airplane Flight Manual:
"Avoid continuous operation between 2,100 and 2,350 r.p.m."
(b) Mark engine tachometer with a red arc from 2,100 to 2,350 r.p.m., install Mooney decal P/N 150010-65, on tachometer bezel glass in accordance with Mooney Service Letter No. 21-127, dated April 15, 1965.
This directive effective May 28, 1965.