AD 64-21-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; Piper Model PA-30 and PA-23-250 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-30 | Airworthiness Directives; Piper Model PA-30 and PA-23-250 Aircraft |
Unsafe Condition
Propeller failure due to insufficient replacement of governor relief valve springs as per Hartzell Service Bulletin No. 88, leading to continued operational risks.
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Required Actions
Service propeller governors in accordance with Hartzell Service Bulletin No. 88A dated August 4, 1964, within 10 hours' time in service after the effective date of this AD. Additionally, comply with prior Service Bulletin No. 88 if not already done.
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Compliance Time
within 10 hours' time in service after the effective date of this AD
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Affected Aircraft
Piper Model PA-30 and PA-23-250 aircraft equipped with specific Hartzell propellers: PA-30 with HC-E2YL-2B/7663-4 and PA-23-250 with HC-E2YK-2RB/8465-7R propellers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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