# AD 58-08-05: Pitch Lock

- Type: Airworthiness directive
- Status: Current
- Products: Hamilton Standard Division 34E, 43E and 43H
- Superseded by: Nothing supersedes this AD
- Product type: Propeller
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F4D88775AEAF22AD8625697000630BC2.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/58-08-05

## The airworthiness directive

58-08-05 HAMILTON STANDARD: Applies to All 34E, 43E, and 43H Propellers Installed on TC18DA and TC18EA Series Engines. Compliance required at first propeller overhaul after October 1, 1958, but not later than May 1, 1959.

Cases of propeller-engine overspeeds have resulted in instances of failure to feather, reversing when feathering was initiated, and in aircraft fires. In order to provide a means for limiting propeller overspeeding so that the possibility of catastrophic conditions developing will be greatly minimized, install the "RPM-Sensitive Hydraulic Pitch Lock".

(Hamilton Standard Service Bulletins Nos. 387, 472, and 472A cover this same subject.)

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS P-871](https://openairdocs.org/tcds/P-871): Hamilton Standard Division; names 1 of 1 models: 43E
- [TCDS P-881](https://openairdocs.org/tcds/P-881): Hamilton Standard Division; names 1 of 1 models: 34E
- [TCDS P-887](https://openairdocs.org/tcds/P-887): Hamilton Standard Division; names 1 of 1 models: 43H

## 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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