AD/RAD/22 Press-to-Talk Assembly Modification 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/RAD/22.

Radio Communication and Navigation Equipment

AD/RAD/22 Press-to-Talk Assembly - Modification 4/2009

Requirement:

CANCELLED.

This AD is cancelled on 9 April 2009.

Background:

This unique Australian AD was raised in1971 requiring a modification to Aerosound 555-900 Press-to-Talk assembly to ensure that a transmitter would not remain energised after the Press-to-Talk button is released.

Incorporation of Air Communications Pty. Ltd. modification specification
AC-M-1004 was an acceptable means of compliance.

Compliance was before 1 April 1971.

Given the extended period this AD has been promulgated, and that affected Press-to-Talk assemblies would have been modified by now, this AD is considered to be no longer required.

James Coyne
Delegate of the Civil Aviation Safety Authority

19 February 2009