AD/PT6A/27 Compressor Bleed Off Valve Cancelled (Cth)

AIRWORTHINESS DIRECTIVE

On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive AD/PT6A/27.

Pratt and Whitney Canada Turbine Engines - PT6A Series

AD/PT6A/27 Compressor Bleed Off Valve 8/2008

Requirement:

CANCELLED.

This AD is cancelled on 31 July 2008.

Background:

This AD was originally issued in response to Transport Canada AD CF-96-24.  Transport Canada has determined that on the basis that the conservative compliance time/date defined for the inspection has elapsed and the fact that there have been no further reported occurrences of the original Bleed Off Valve (BOV) malfunctions since April 1997, AD CF-96-24 is no longer required.

A review of SDR data has concluded that there have no reported occurrences of the original BOV in Australia during the same period.

In response to the findings above this AD is cancelled.

James Coyne
Delegate of the Civil Aviation Safety Authority

19 June 2008