AD NUMBER: 2007-08-02
SUBJECT: Airworthiness Directive 2007-08-02 SUMMARY: The FAA is adopting a new airworthiness
directive (AD) for Hartzell Propeller Inc. model HC-E4A-3(
)/E10950( ) propellers.
This AD requires initial and repetitive inspections and rework
of the propeller blade retention radius, and replacement of the
propeller blade thrust bearing, for each blade.
This AD results from reports of excessive propeller vibration
and of damaged or broken propeller blade thrust bearings found
during routine and investigative propeller disassembly.
We are issuing this AD to prevent propeller blade separation,
damage to the airplane, and possible loss of airplane control.