Document ID: chunk:federal_register_of_legislation:F2006B08412:body:0:p2
Version: federal_register_of_legislation:F2006B08412
Segment Type: other
Provision Reference: 
Character Range: 2874–4074

Administration (FAA) and Cessna carried out an analysis of the pitch trim system. This analysis revealed the potential for a single- wire shorting to 28 volts or a failure of a relay in the electric pitch trim system such that the relay contacts remain closed and precludes disconnect of the pitch trim using the control wheel autopilot/trim disconnect switch.

            The original issue of this Directive required the pitch trim circuit breaker and AP servo circuit breaker to be opened (disengaged) and tied to prevent them from being engaged. This action was designed to correct a single-point failure in the electric pitch trim system, which could result in a runaway pitch trim condition where the pilot could not disconnect using the control wheel autopilot/trim disconnect switch.

            This Amendment introduces an optional terminating action to the opening (disengaging) of the circuit breakers.

            The original issue of this Airworthiness Directive became effective on 24 October 2003.

 Jim Coyne
 Delegate of the Civil Aviation Safety Authority 23 October 2003

 The above AD is notified in the Commonwealth of Australia Gazette on 27 October 2003.