58-08-05: Pitch Lock
FAA order 58-08-05 is an airworthiness directive. The FAA's subject line: Pitch Lock. System: propeller.
What it applies to as the FAA lists it
- Kind of product
- Propeller
- Makes
- Hamilton Standard Division
- Models
- 34E, 43E, 43H
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (672 characters)
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.)
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/58-08-05.json · aircraft systems.