AD/AC/1 Wing Rib Reinforcement 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/AC/1.

Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600 and 700) Series Aeroplanes

AD/AC/1 Wing Rib - Reinforcement 8/2008

Requirement:	CANCELLED.
This AD is cancelled on 31 July 2008.
Background:	This unique Australian AD, issued prior to 1960 against Aero Design (also known as Aero Commander) Service Bulletin (SB) No. 20, required the installation of a reinforcement rib in both wings at station 145 to prevent buckling of the existing rib under certain manoeuvring conditions.  Compliance was required forthwith.  As all affected aircraft would have been modified long ago, this AD is no longer required.

David Villiers
Delegate of the Civil Aviation Safety Authority

18 June 2008