# AD 66-09-02: Pitch Lock

- Type: Airworthiness directive
- Status: Current
- Products: Dowty Propellers (c) R179/4-20-4/, (c) R184/4-30-4/ and (c) R193/4-30-4/
- Effective: June 16, 1966
- Superseded by: Nothing supersedes this AD
- Product type: Propeller
- Amendment: 39-215
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B511A7451C5A1A568625696D0052828F.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/66-09-02

## The airworthiness directive

66-09-02 DOWTY ROTOL: Amdt. 39-215 Part 39 Federal Register March 23, 1966. Applies to Dowty Rotol Propellers, (c) R.193/4-30-4/50, installed on Fairchild F-27; (c) R.184/4- 30-4/50, installed on Grumman G-159; and (c) R.179/4-20-4/33, installed on Viscount 810.

Compliance required within the next 200 hours' time in service after the effective date of this AD unless already accomplished.

To prevent further improper operation of the propeller pitch lock under high oil temperature conditions, rework the existing Lock Support Sleeve, Dowty Rotol P/N RA.61236, in accordance with Dowty Rotol Service Bulletin No. 61-185 (Modification No. (c) VP.2032) or later ARB-approved revision.

This directive effective April 22, 1966.

Revised June 16, 1966.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS P-899](https://openairdocs.org/tcds/P-899): Dowty Propellers; names 2 of 9 models: (c) R193/4-30-4/, (c) R184/4-30-4/
- [TCDS P-890](https://openairdocs.org/tcds/P-890): Dowty Propellers; names 1 of 5 models: (c) R179/4-20-4/

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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