AD 74-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hartzell Propeller, Inc. | HC-B3T | HARTZELL PROPELLERS Models T10173H()+(), T10176H()+(), T10178H()-(), and ()T10282H()+(), HC-B3TN-2( ), HC- B3TN-3( ), HC-B3TN-5( ), HC-B3TN-7( ), HC-B3TF-7( ), HC-B4TN-3( ) and HC-B4TN-5( ) Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-B4TN-3 | HARTZELL PROPELLERS Models T10173H()+(), T10176H()+(), T10178H()-(), and ()T10282H()+(), HC-B3TN-2( ), HC- B3TN-3( ), HC-B3TN-5( ), HC-B3TN-7( ), HC-B3TF-7( ), HC-B4TN-3( ) and HC-B4TN-5( ) Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-B4TN-5 | HARTZELL PROPELLERS Models T10173H()+(), T10176H()+(), T10178H()-(), and ()T10282H()+(), HC-B3TN-2( ), HC- B3TN-3( ), HC-B3TN-5( ), HC-B3TN-7( ), HC-B3TF-7( ), HC-B4TN-3( ) and HC-B4TN-5( ) Propellers |
Unsafe Condition
Blade cracks and defects in Hartzell propellers could lead to blade failures.
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Required Actions
Inspect blades for cracks or defects per Hartzell Bulletin No. 105 or equivalent procedure. Replace cracked or defective blades before further flight with compliant blades or those inspected and found satisfactory.
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Compliance Time
Within the next 50 hours time in service for propellers with less than 950 hours, prior to 1000 hours in service for those between 950-1000 hours, or as adjusted by FAA approval.
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Affected Aircraft
Hartzell Propeller, Inc. models HC-B3TN-2, HC-B3TN-3, HC-B3TN-5, HC-B3TN-7, HC-B3TF-7, HC-B4TN-3, HC-B4TN-5 propellers with serial numbers below specified thresholds (e.g., HC-B3TN-2 S/N AG-275 and below).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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