AD 2004-13-01
Unsafe Condition
Propeller hub failure due to cracks in the hub, which could result in loss of control of the airplane.
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Required Actions
Initial and repetitive ultrasonic inspections of propeller hubs, part number 660709201, installed on airplanes. For hubs and propellers in storage, initial ultrasonic inspection of propeller hubs before placing in service.
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Compliance Time
Within 50 flight hours or 6 months after the issue date of the relevant Mandatory Service Bulletin, whichever occurs first.
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Affected Aircraft
Dowty Aerospace Propellers Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, and R334/4-82-F/13 propeller assemblies with propeller hubs part number 660709201, installed on various aircraft models including CASA 212, British Aerospace Regional Aircraft Jetstream Models 3101 and 3201, Fairchild Aircraft Merlin IIIC, and Merlin IVC/Metro III airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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