AD 75-20-08

75-20-08 BEECH: Amendment 39-2374. Applies to Model B24R (Serial Numbers MC-151 thru MC-302, MC-304, MC-307, MC-309, MC-310, MC-312 thru MC-315, MC-317, MC-324, MC-328, MC-333, MC-336, MC-344, MC-345, MC-347 thru MC-357, MC-359 and MC-361 thru MC-364) airplanes.

Compliance: Required as indicated, unless already accomplished.

To preclude the possibility of propeller governor failure, accomplish the following:

1) Unless previously accomplished, prior to further flight, drain the Rust Ban Preservative Oil installed by the airplane manufacturer and refill with SAE 30 or SAE 50 straight mineral oil or the type and grade of oil recommended by the engine manufacturer.

2) If the airplane has less than 25 hours' total time in service, prior to further flight, remove the propeller governor and replace with a new or serviceable P/N A210490 propeller governor.

3) Aircraft may be flown to a place where the AD can be accomplished in accordance with FAR 21.197 providing the propeller governor is found to govern engine RPM properly during pre-flight runup.

Beechcraft Service Instruction No. 0765-254 pertains to this subject.

This amendment becomes effective October 3, 1975, to all persons except those to whom it was made effective earlier by air mail letter issued September 15, 1975.