Regulacje i polityka gospodarcza · 20/11/2001

Airworthiness Directives; Hartzell Propeller, Inc. Compact Series Propellers

The Federal Aviation Administration (FAA) proposes to supersede an existing airworthiness directive (AD) that is applicable to Hartzell models ( )HC-( )( )Y( )-( )( )( ) compact series, constant speed or feathering propellers with Hartzell manufactured "Y" shank blades. That AD currently requires initial and repetitive blade inspections; rework of all "Y" shank blades including cold rolling of the blade shank retention radius; blade replacement and modification of pitch change mechanisms for certain propeller models; and changing the airplane operating limitations with specific models of propellers installed. These inspections and modifications are required to detect and prevent fatigue cracks that might result in blade separation. This proposal would require initial blade inspections, with no repetitive inspections; rework of all "Y" shank blades including cold rolling of the blade shank retention radius, blade replacement and modification of pitch change mechanisms for certain propeller models; and changing the airplane operating limitations with specific models of propellers installed. This proposal is prompted by FAA reviews of propeller service histories since the issuance of