Document ID: chunk:federal_register_of_legislation:F2006B09255:body:0:p2
Version: federal_register_of_legislation:F2006B09255
Segment Type: other
Provision Reference: 
Character Range: 2843–3880

to deplete. In addition, the shuttle valve internal garter spring had also failed. This failure allowed the Number 1 hydraulic system return pressure to move the valve, causing the Number 1 hydraulic system fluid to also deplete through the same brake unit. Loss of hydraulic power from both hydraulic systems will reduce the controllability of the aircraft.

            In addition, another incident has been reported of a brake seizure and subsequent wheel assembly fire while taxiing. Investigation revealed that hydraulic pressure remained applied to the brake unit even after brake release. It was determined that the dislodging of the 10-micron filter in the brake shuttle valve had blocked the valve
            port and prevented hydraulic fluid flow from the brake. Brake failure could result in the loss of directional control on the ground.

 James Coyne
 Delegate of the Civil Aviation Safety Authority 4 March 2004

 The above AD is notified in the Commonwealth of Australia Gazette on 24 March 2004.