AD 57-16-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Standard | Governors | HAMILTON STANDARD Models 4U18 and 5U18 Propellers |
Unsafe Condition
Oil leakage causing propeller reversal due to governor body mounting holes drilled beyond tolerances.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect governor bodies by measuring solenoid valve mounting hole depth and wall thickness per Service Bulletin No. 518. Remove governors with hole exceeding 0.490 inch deep or wall thickness less than 0.035 inch from service. Comply with inspection outlined in Service Bulletin No. 518 by next overhaul.
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Compliance Time
As soon as practicable, but not later than next overhaul of all governors.
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Affected Aircraft
Hamilton Standard Models 4U18 and 5U18 Propellers' two-flyweight governors.
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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