A319
Maintenance Airframe; Maintenance Powerplant
Confusion; Human-Machine Interface
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Maintenance
General Maintenance Action
Procedure; Aircraft; Human Factors
Aircraft upon arrival at ZZZ for scheduled XX check. Found the crew O2 bottle shut off valve safety wired backwards. Safety wire as installed; would not resist the valve from turning towards the closed position. Make installation of safety wire and valve position an inspection requirement anytime crew O2 bottle valve knob is disturbed.
A319 technician reported discovering the crew O2 bottle shut off valve was safety wired backwards and would not keep the valve from being rotated to the closed position.