A319
Maintenance Airframe; Maintenance Powerplant
Human-Machine Interface; Training / Qualification
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Human Factors; Procedure; Manuals
While performing [maintenance]: Install 'PULL' strap on FA (Flight Attendant) O2 Masks- Aft Galley CTR (Center) Aisle FA O2 Box; found O2 canister safety pin and red streamer still installed when I opened the panel to install the pull straps. This safety pin clearly says to remove after canister installation; and should there have been an emergency requiring use of these O2 masks; it would prevent O2 canister from working at all. Per the [Engineering Order] task card I removed the safety pin and streamer before closing the panel and performing an operational check of the repacked O2 masks.
Technician discovered emergency oxygen canister improperly installed rendering it inoperative on an A319.