AD 75-03-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Sundstrand | 54H | HAMILTON STANDARD Models 54H60-63, -81, -91, -111, -117, and -125 Propellers |
Unsafe Condition
Inflight separation of the extension sleeve, P/N 541850, Change B or earlier revision, from the pitch lock regulator assembly resulting in propeller pitchlocking.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the fluid transfer housing extension sleeve with P/N 541850C or later revision, or modify per Hamilton Standard Service Bulletin HS Code 54H60, No. 59, Revision No. 1, or later FAA approved revision. Replace surge valve housing P/N 543734B or earlier with P/N 543734C or later, or replace P/N 535299E or earlier with P/N 535299F or later.
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Compliance Time
Within the next 100 hours time in service for propellers with 2500 or more hours as of effective date or unknown time, prior to 2600 hours total time in service for those with less than 2500 hours.
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Affected Aircraft
Hamilton Sundstrand Models 54H60-63, -81, -91, -111, -117, and -125 Propellers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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