AD 86-01-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hamilton Sundstrand | 54H | HAMILTON STANDARD Models 54H60-77, -81, -123, -125, -131, and -133 Propellers |
Unsafe Condition
Loss of aircraft control and possible loss of aircraft due to slippage of the valve housing cover input gear when less than 36 pounds of load is applied.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct a functional check of the propeller valve housing cover input gear within 30 days after the effective date. If slippage occurs below 36 pounds, remove the valve housing cover assembly before further flight. If slippage is between 36-38 pounds, mark the cover and return to service. Later, inspect the valve housing cover during component maintenance or by January 15, 1988, remove and replace input gears with change letter 'G', and mark accordingly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 30 days after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Hamilton Standard models 54H60-77, -81, -123, -125, -131, and -133 propellers with propeller control S/N 850901 or lower installed on CV580, L188, and Guppy aircraft.
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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