AD Amdt-39-18007
Unsafe Condition
Failure of the propeller de-ice bus bar due to friction or contact between the bus bar and the backplate assembly, consequent intermittent short circuit, and possible double generator failure.
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Required Actions
Apply sealant between the bus bar assemblies and the backplate assembly for R408/6-123-F/17 model propellers with LRU S/N below DAP0347 within specified compliance times. Re-apply sealant every 10,500 flight hours for R408/6-123-F/17 model propellers with LRU S/N below DAP0927.
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Compliance Time
Within 5,000 flight-hours after September 27, 2010, or within 100 flight-hours after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Dowty Propellers R408/6-123-F/17 model propellers with a hub, actuator, and backplate assembly LRU serial number (S/N) below DAP0927.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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