2024-03 · NASA ASRS report 2097491
Technician reported aircraft rolled uncommanded during pushback from gate due to hydraulic system failure and subsequent loss of brake response.
at around XA:20; we were assigned to repo the aircraft from Gate XX to the hangar. after given clearance to push from Gate and position into [spot] X on lane X; ground crew advised to set brakes which we did. after towbar and tractor was disconnected; the aircraft started rolling forward with no engines. both left seat and right seat applied pressure on the rudder pedals to try to stop the plane; but no response. i noticed that the brake accumulators were reading zero so i turned on the elec hyd pump and the plane came to a stop on the grass. Person A told me to 'call' so i called on the frequency i was on at the moment; which was ZZZ Ramp; and [requested priority handling]; but no readback. i looked at the ECAM and noticed that the engines started spooling up to idle. Person A started up the engines and he began taxing the plane out of the grass and into the taxiway. i switched frequencies to Ground and they eventually told us to stop and standby. next Ground finally told us to reenter the ramp and asked if we knew where we're going; i said yes; and they told us to switch frequencies and proceed to the hangar. Cause: aircraft was out of service due to hyd issuesSuggestions: tow the aircraft
On Day 0 Aircraft X was on Gate XX aircraft out of service for hyd leak. after trouble shooting management requested aircraft to be move to hangar for repairs. Once ground crew push back from gate XX to lane X spot X. ground crew then disconnected and gave clearance to start engines. Brake was set about to start engines when aircraft started rolling i immediately asked right seat driver to apply brakes and call ZZZ to advise of aircraft problems and did not get response. Aircraft then rolled on to Taxiway 1 into grass area once stopped i proceeded to start engines and taxied to lane Y then hangar line.Cause: Green system hydraulic failure.Suggestions: Have more qualified personnel for aircraft towing.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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