Propellers - Auxiliary Motor and Pump - Replacement
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must remove and replace the affected auxiliary motor and pump within 90 days after the AD's effective date of October 20, 2023. After replacement, a post-installation system test must be performed as specified in the Hamilton Sundstrand Service Bulletin 14SF-61-168, Revision 1. Installation of the older auxiliary motor and pump part number 782655-3 is prohibited after the effective date.
Summary
Federal Aviation Administration Airworthiness Directive 2023-16-06 is a final rule addressing all Hamilton Sundstrand Corporation Model 14SF-17 and 14SF-19 propellers, which are installed on aircraft including Viking Air Limited Model CL-215-6B11 and CL-415 variants. This directive mandates replacement of a specific auxiliary motor and pump assembly to prevent in-flight failure to feather the propeller. The AD aims to enhance flight safety by mitigating risks associated with motor magnet corrosion causing loss of propeller feathering capability.
What changed
This new airworthiness directive requires removal and replacement of the auxiliary motor and pump with part number 782655-3 (Aerocontrolex P/N 4122-006009) with a newer part number 782655-4 (Aerocontrolex P/N 4122-056000). It also prohibits installation of the older auxiliary motor and pump on any propeller after the effective date. The AD incorporates Hamilton Sundstrand Service Bulletin 14SF-61-168, Revision 1, as the method for compliance.
Why it matters
This AD is critical for aviation professionals because failure of the auxiliary motor and pump to feather the propeller can lead to reduced aircraft controllability and potential loss of control. Operators and maintenance organizations must ensure compliance to maintain airworthiness and safety of affected aircraft. The directive prevents use of defective parts that have shown corrosion-related failures, thereby reducing in-flight risks.
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