A line mechanic reports finding a crew oxygen bottle shut-off valve in the closed position and the v...

Attributes
ACN	983205
Time
Date	201112
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Oxygen System/Crew
Person 1
Function	Technician
Qualification	Maintenance Powerplant Maintenance Airframe
Experience	Maintenance Technician 25
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

Mechanic found the crew oxygen bottle shut-off valve in the closed position. Valve was also safety wired in the closed position. Bottle was changed at foreign station in november 2011. Issue was found during the a-check performed at the hangar. Oxygen needed to be serviced and mechanic was unable to fill crew oxygen. Upon further investigation he found the crew oxygen shut-off valve closed. The a-check jobcard exterior check also requests mechanic to check to make sure the shut-off valve is lockwired in the open position.

Original NASA ASRS Text

Title: A Line Mechanic reports finding a crew oxygen bottle shut-off valve in the closed position and the valve handle also safety wired in the closed position during an A-check on a B777-200 aircraft.

Narrative: Mechanic found the crew oxygen bottle shut-off valve in the closed position. Valve was also safety wired in the closed position. Bottle was changed at foreign station in November 2011. Issue was found during the A-check performed at the hangar. Oxygen needed to be serviced and Mechanic was unable to fill crew oxygen. Upon further investigation he found the crew oxygen shut-off valve closed. The A-check jobcard exterior check also requests Mechanic to check to make sure the shut-off valve is lockwired in the open position.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

A line mechanic reports finding a crew oxygen bottle shut-off valve in the closed position and the valve handle also safety wired in the closed position during an a-check on a B777-200 aircraft.