AD 71-21-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hartzell Propeller, Inc. | HC-E2Y | HARTZELL PROPELLERS Models HC-E2YK-2RB, HC-E2YR-2RB, and HC-E2YL-2( ) Propellers |
Unsafe Condition
Overspeeds in flight due to inadvertent loss of the propeller's air charge.
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Required Actions
Install appropriate Spring Backup Kit and the propeller in accordance with Hartzell Service Letter No. 62 dated June 23, 1970, revised August 6, 1970, or subsequent FAA-approved revision. Equivalent methods must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
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Compliance Time
Within the next 100 hours' time in service or prior to the accumulation of 1,000 hours in service since new or last overhaul, depending on the propeller's time in service as of the effective date.
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Affected Aircraft
Hartzell Propeller, Inc. Models HC-E2YK-2RB, HC-E2YR-2RB, and HC-E2YL-2( ) Propellers equipped with 8465-7R, 7663-4, or J7663-4 noncounterweighted type blades.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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