AD 2024-07-01
Unsafe Condition
The auxiliary motor and pump installed on a non-Hamilton Sundstrand propeller failing to feather the propeller in flight through either the primary or the backup means, caused by motor magnets in the auxiliary motor and pump that were de-bonded due to corrosion at the magnet and housing interface.
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Required Actions
Replace a certain auxiliary motor and pump with an auxiliary motor and pump having part number (P/N) 782655-4 (Aerocontrolex P/N 4122-056000). Perform post-installation system test. Remove from service an auxiliary motor and pump having part number (P/N) 782655-3 (Aerocontrolex P/N 4122-006009).
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Compliance Time
Before further flight
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Affected Aircraft
Hamilton Sundstrand Corporation Model 14SF-7, 14SF-15, and 14SF-23 propellers, installed on, but not limited to, De Havilland Aircraft of Canada Limited (Type Certificate previously held by Bombardier Inc.) Model DHC-8-100 series, DHC-8-200 series, and DHC-8-300 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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