AD/BEECH 60/14 Amdt 1 Main Undercarriage Up-Lock 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/BEECH 60/14 Amdt 1.

Beechcraft 60 (Duke) Series Aeroplanes

AD/BEECH 60/14 Amdt 1 Main Undercarriage Up-Lock 6/2008

Requirement:

CANCELLED.

This AD is cancelled on 5 June 2008.

Background:

This unique Australian AD, issued in 1972, sited Beechcraft Service Instruction (SI) No. 0482-211, rather than a State of Design AD, to modify, at the owners discretion, the LH and RH main landing gear up-lock roller assembly by fitting a lubricating bolt.

Compliance was complex, with pilot maintenance and 50 hour TIS or 12 month maintenance periods included, but the modification had to be accomplished within 100 hours TIS, or 2 months after 1 March 1972, whichever occurs first.

At the time of issue of this AD it was considered that both locally and overseas accidents and incidents attributable to malfunctions of the main landing gear continued to occur.  Therefore, in addition to the SI provisions to fit a lubricating bolt, further maintenance requirements were included in this AD such as an inspection for over extension of the up-lock spring, inspection/ lubrication of the up-lock roller and the inspection of the up-lock block.

As was considered at the time of cancellation of AD/BEECH 35/21C in 1981, which had the same provisions as this AD, it is also considered appropriate that the cancellation of this AD is warranted on the grounds that it is in the main a maintenance AD.  Also, that maintenance of landing gear mechanisms is a continuous problem that cannot be solved by AD action, only by improved maintenance standards.

This AD is therefore cancelled.

James Coyne
Delegate of the Civil Aviation Safety Authority

22 April 2008