AD 86-05-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hartzell Propeller, Inc. | HC-B3T | HARTZELL PROPELLER PRODUCTS DIVISION Model HC-B3TN-5( )/T10282( ) Propellers |
Unsafe Condition
Propeller blade separation near the hub which could result in engine separation from the aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove propeller from aircraft and accomplish inspections and repairs per Hartzell Service Bulletin No. 136C, including disassembling, visually inspecting the blade pilot tube bore area, removing scratches/corrosion, etching, penetrant inspecting, alodining, installing bearings, and lubricating. Replace blades with cracks/unairworthy conditions. Add a WARNING in the flight manual supplement about torque limits.
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Compliance Time
Prior to accumulating 1,000 hours time in service since new or 300 hours time in service since overhaul, or within 30 days after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Hartzell Model HC-B3TN-5/T10282 propellers installed on Fairchild SA226-TC aircraft with Garrett STC SA344GL or Par Air STC SA4872SW and TPE331-10UA engines, excluding blades with serial numbers subsequent to F74359 and propellers on TPE331-3 engines unless previously used on TPE331-10UA for required hours.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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