Document ID: chunk:federal_register_of_legislation:F2006L00756:body:0:p2
Version: federal_register_of_legislation:F2006L00756
Segment Type: other
Provision Reference: 
Character Range: 2867–3996

system is serviceable following loss of manual pitch trim.  This pitch trim failure is characterized by illumination of the "PITCH TRIM" Caution Light and concurrent loss of pitch trim function, during a manual pitch trim input by the flight crew.

             Note 3:  Transport Canada AD CF-2002-25 refers.
Compliance:  For Requirements 1 and 2 - Within 30 days after the effective date of this Directive.
             This Airworthiness Directive becomes effective on 13 April 2006.
Background:  Transport Canada has advised that two unrelated but recurring malfunctions have been identified with the pitch trim system.  The first malfunction involves loss of the autopilot pitch trim, which then requires that the autopilot be disengaged and the aircraft flown manually.  With the second malfunction, loss of manual pitch trim can occur due to the pitch trim system being disabled by the monitoring/modelling circuitry in the FCECU.  These pitch trim system malfunctions can, under adverse conditions, significantly increase flight crew workload.

James Coyne
Delegate of the Civil Aviation Safety Authority

2 March 2006