During maintenance on a B747-400 aircraft a mechanic was directed to safety wire oxygen bottle manua...

Narrative:

I was asked to reverse the securing of oxygen bottles on a B747-400 aircraft per maintenance manual (M/M) [servicing chapter] 12-00-98. The item was on page 207; item (5). The sidewall where the O2 oxygen bottles are located was taken down and left open. I preceded to open and safety the six bottles. The aircraft maintenance manual (amm) does not mention whether the O2 bottles are for crew or passenger. I opened and safetied six passenger O2 bottles. Later; when the flight crew requested crew O2 service due to pressure of 1190 psi; crew oxygen bottle was found to be closed and not safetied. I did not see an open panel with crew O2 bottles; they were not mentioned in the amm; and [I] did not perform any maintenance on them. The crew oxygen was then serviced to full.

Original NASA ASRS Text

Title: During maintenance on a B747-400 aircraft a Mechanic was directed to safety wire oxygen bottle manual shut-off valves in the 'Open' position. Mechanic was later informed the flight crew oxygen bottle was found in the 'Closed' position.

Narrative: I was asked to reverse the securing of oxygen bottles on a B747-400 aircraft per Maintenance Manual (M/M) [Servicing Chapter] 12-00-98. The item was on Page 207; Item (5). The sidewall where the O2 oxygen bottles are located was taken down and left open. I preceded to open and safety the six bottles. The Aircraft Maintenance Manual (AMM) does not mention whether the O2 bottles are for crew or passenger. I opened and safetied six passenger O2 bottles. Later; when the flight crew requested crew O2 service due to pressure of 1190 PSI; crew oxygen bottle was found to be closed and not safetied. I did not see an open panel with crew O2 bottles; they were not mentioned in the AMM; and [I] did not perform any maintenance on them. The crew oxygen was then serviced to full.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1007198
Time
Date	201204
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Oxygen System/Crew
Person 1
Function	Technician
Qualification	Maintenance Powerplant Maintenance Airframe
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

During maintenance on a B747-400 aircraft a mechanic was directed to safety wire oxygen bottle manual shut-off valves in the 'open' position. Mechanic was later informed the flight crew oxygen bottle was found in the 'closed' position.