# AD 75-20-08: Airworthiness Directives; BEECH Model B24R Airplanes.

- Type: Airworthiness directive
- Status: Current
- Products: Textron B24R
- Effective: September 15, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2374
- Registered aircraft: 117 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7649EA3CEE5F2CE386256A08006E6A7E.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/75-20-08

## The airworthiness directive

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.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A1CE](https://openairdocs.org/tcds/A1CE): Textron Aviation Inc.; names 1 of 14 models: B24R

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 117 (117 by airframe model, 0 by engine model)
- Makers: Beech 117

Models with the most aircraft:

- [Beech B24R](https://openairdocs.org/model/beech-b24r): 117 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/75-20-08/models.md
Every aircraft: https://openairdocs.org/ad/75-20-08/aircraft.md

Its text cites no advisory circulars or STCs.

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