AD 96-15-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hartzell Propeller, Inc. | HC-B3T | Hartzell Propeller Inc. Models HC-B3TN, HC-B5MP, HC-E4A, and HC-D4N Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-B5MP-3 | Hartzell Propeller Inc. Models HC-B3TN, HC-B5MP, HC-E4A, and HC-D4N Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-B5MP-5 | Hartzell Propeller Inc. Models HC-B3TN, HC-B5MP, HC-E4A, and HC-D4N Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-D4N | Hartzell Propeller Inc. Models HC-B3TN, HC-B5MP, HC-E4A, and HC-D4N Series Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-E4A | Hartzell Propeller Inc. Models HC-B3TN, HC-B5MP, HC-E4A, and HC-D4N Series Propellers |
Unsafe Condition
Propeller blade separation caused by cracks emanating from forging flaws in the propeller blade shank.
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Required Actions
Conduct a one-time fluorescent dye penetrant inspection of a twelve-inch area on both the face and camber sides of propeller blade shanks for forging flaws or cracks. Replace defective blades with serviceable parts. Perform inspection prior to further flight if sudden or unusual vibration occurs.
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Compliance Time
Within 10 hours time-in-service (TIS) after the effective date for agricultural or acrobatic aircraft; within 60 hours TIS for all others. Inspection required before further flight if vibration occurs.
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Affected Aircraft
Hartzell Propeller Inc. HC-B3TN, HC-B5MP, HC-E4A, and HC-D4N series propellers with blades manufactured between March 1992 and June 1996, serial numbers listed in ASB HC-ASB-61-220, installed on specified aircraft models including Air Tractor, Ayres, Pilatus, Short Brothers, etc.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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