A320
Maintenance Airframe; Maintenance Powerplant
Time Pressure; Training / Qualification; Workload
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance
General Maintenance Action
Aircraft; Chart Or Publication; Company Policy; Manuals; Procedure
I am filing this for the technician that was tasked with this job. Aircraft X had a log to flush blue system hydraulics due to contaminated hydraulic fluid. The procedure in the AMM called out for a tool to purify the hydraulic fluid which [our] company didn't have. The mechanics were then told to follow the AMM until they came to a 'roadblock' and then figure it out from there. Eventually they used the Hydraulic Mule; which got contaminated; and figured out a way to flush it through the RAT (Ram Air Turbine) system. Capturing the contaminated fluid became another issue as no one could determine at what pressure this fluid would exit the line. Furthermore; because there was no procedure in place for this task no one could give guidance on what pressure to dial into the Mule in order to get the fluid pushed out (they eventually started at 50 psi and worked their way up to approx 2000 psi which was adequate to complete the task. Whoever wrote the task card should have ensured there was a viable AMM or procedure to accomplish this task and that the correct tooling was in place. We are now aware of several other Airbus aircraft around the system going through the exact same hydraulic contamination issue. In the case of [another] aircraft; it is the Green and Yellow systems that are affected which would necessitate a gear swing if i understand correctly. Could the ERC (event review committee) pleased use all resources to ensure proper procedures and tooling are in place prior to tasks like this one being assigned. Also; is it possible to find out the source of this hydraulic contamination?
Technician reported inadequate Task Card and Aircraft Maintenance Manual references; exacerbated by wrong tooling caused difficulties in purging as contaminated aircraft hydraulic system.