AD 75-22-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-31P | Airworthiness Directives; Piper Model PA-31P Aircraft |
Unsafe Condition
Propeller overspeeding and loss of feathering capability due to low propeller air dome pressure.
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Required Actions
Within 10 hours time in service after the effective date, incorporate temporary AFM instructions for engine run-up and emergency procedures. Within 30 days after the effective date, replace propellers with Hartzell Models HC-C3YN-2LU or HC-C3YN-2LUF. After propeller replacement, remove the temporary AFM instructions.
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Compliance Time
Within 10 hours time in service after the effective date of this AD, and within 30 days after the effective date of this AD.
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Affected Aircraft
Piper Model PA-31P aircraft equipped with Hartzell Model HC-C3YN-2L or HC-C3YN-2LF propellers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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