AD 95-01-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hartzell Propeller, Inc. | HC-B4TN-5 | Hartzell Propeller, Inc., Model HC-B4 Series Propellers |
Unsafe Condition
Fatigue cracks can initiate in the propeller hub arm bore due to fretting caused by high stress loading during propeller ground resonance in the 'reactionless mode', and the current hub design and blade repair limits do not adequately prevent fatigue cracks or resonant speed shifts into the permitted ground idle operating range.
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Required Actions
Replace existing LT10282(B,K)-5.3R blades with LT10282N(B,K)-5.3R 'N' configuration blades, shot peen all 'N' blades, establish a 10,000-hour time-in-service retirement limit for 'N' blades, replace hubs with improved steel hubs, and inspect/rework steel hubs every 3,000 hours time-in-service.
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Compliance Time
Effective January 27, 1995
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Affected Aircraft
Hartzell Propeller, Inc. Model HC-B4TN-5(D,G,J)L/LT10282(B,K)-5.3R and HC-B4TN-5(D,G,J)L/LT10282N(B,K)-5.3R propellers installed on Mitsubishi MU-2 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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