AD/A109/26 Hydraulic System Return Line 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/A109/26.

Agusta A109 Series Helicopters

AD/A109/26 Hydraulic System Return Line 9/2009

Requirement:

CANCELLED.

This AD is cancelled on 27 August 2009.

Background:

This unique Australian AD raised in1996 against Augusta Bollettino Technico 109-98 Rev A required a modification by installation of a by-pass valve on advice from the manufacture that disconnection of the quick release coupling in the No.1 hydraulic return line will cause lock-up of the hydraulic system.  The lock-up condition could be detected if flight manual pre-flight checks are correctly carried out.

Compliance was prior to 30 June 1996.

This AD has been sufficiently promulgated for the affected helicopters to have been modified by now; therefore this AD is considered to be no longer required.

James Coyne
Delegate of the Civil Aviation Safety Authority

30 June 2009