58-08-04: Pitch Locks
FAA order 58-08-04 is an airworthiness directive. The FAA's subject line: Pitch Locks. System: propeller.
What it applies to as the FAA lists it
- Kind of product
- Propeller
- Makes
- Hamilton Standard Division
- Models
- 232, 242, 34D, 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 (736 characters)
58-08-04 HAMILTON STANDARD: Applies to all Models 23260, 24260, 34D50, 34D51, 34E60, 43E60, and 43H60 Propellers Incorporating Pitch Locks.
Compliance required at first propeller overhaul after May 15, 1958, if not already accomplished.
Two cases have been reported wherein the dome cap of propellers incorporating a pitch lock become partially disengaged in flight, resulting in complete loss of propeller control.
To preclude additional failures of this nature, reduce to 0.013 or less the clearance between the dome cap and stop lever sleeve bushing by conducting the necessary inspection rework, and/or replacement.
(Hamilton Standard Service Bulletin No. 496D covers this same subject.)
This supersedes AD 58-02-02.
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/58-08-04.json · aircraft systems.