Airworthiness directives › 2006-12-19
AD 2006-12-19 Airworthiness Directives; Hamilton Sundstrand Model 14RF-19 Propellers
Models named: 14RF-19. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Hamilton Sundstrand Model 14RF-19 propellers with propeller system actuator yoke arms, part number (P/N) 810436-2, which might be installed in actuator assemblies P/N 790119-6. These propellers are installed on, but not limited to, SAAB 340 airplanes.
Compliance
You are responsible for having the actions required by this AD performed within 60 days after the effective date of this AD, unless the actions have already been done. Install Improved Actuator Yoke Arms (f) Using the Accomplishment Instructions of Hamilton Sundstrand Service Bulletin 14RF-19-61-113, Revision 1, dated September 2, 2003, replace all actuator yoke arms, P/N 810436-2 with improved actuator yoke arms, P/N 810436-3. (g) Mark newly installed actuators using the Accomplishment Instructions of Hamilton Sundstrand Service Bulletin 14RF-19-61-113, Revision 1, dated September 2, 2003. (h) After the effective date of this AD, do not install any actuator yoke arms, P/N 810436-2, into any propeller assembly. Alternative Methods of
Unsafe condition
This AD results from propeller system actuator yoke arms breaking during flight. We are issuing this AD to prevent actuator yoke arms breaking during flight, which could cause high propeller vibration and contribute to reduced controllability of the airplane.
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