A319
Maintenance Airframe; Maintenance Powerplant
Human-Machine Interface
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural FAR
General Maintenance Action
Procedure; Human Factors; Aircraft
Aircraft upon arrival at  ZZZ for scheduled A 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.
Technician reported discovering the crew O2 bottle shut off valve safety wired backwards during a scheduled A check.