Narrative:

Crew oxygen pressure was below dispatch limits per maintenance check. I removed and replaced the crew oxygen bottle. In my short time at air carrier I have experienced 1 bottle that leaked excessively causing me to replace the bottle a second time. Upon installation of the bottle on aircraft I connected all the lines and turned on the bottle fully minus 1/4 turn. Realizing I forgot leak detection fluid I left the cargo pit to get it from my cart. While outside the aircraft I was asked for help from another mechanic. This took my mind off the task at hand. Upon returning to the pit I double-checked myself in the wrong manner. I turned the valve in the wrong direction till it stopped and backed off 1/4 turn. I didn't realize I was turning the valve in the wrong direction at the time. I performed the leak check and secured the bottle per the maintenance manual. I wired the bottle valve in this position and closed up the access panel. The cockpit operations check was performed per the paperwork with no problems noted. A placard on the top or the side of the bottle with bold print identing on and off directions for the valve could have helped me with my mistake. Placards could be placed in these position depending on the installation confign. There is a small placard on the valve top. You can't read it while you work and you can't see it at all after bottle install in the B-300 and B-500 confign. Supplemental information from acn 730283: while performing maintenance check on aircraft; crew oxygen pressure was low. My fellow mechanic right&right the oxygen bottle and I performed the operations check and did not notice any problems. The aircraft left ZZZ and was in ZZZ1. The aircraft went OTS there. I do not know how this situation can be improved other than making the bottle right&right an rii item.

Related reports:

Google
 

Original NASA ASRS Text

Title: A B737-700 CREW OXYGEN BOTTLE WAS REPLACED. THE NEW BOTTLE WAS ONLY ONE-FOURTH TURN FROM CLOSED POS.

Narrative: CREW OXYGEN PRESSURE WAS BELOW DISPATCH LIMITS PER MAINT CHK. I REMOVED AND REPLACED THE CREW OXYGEN BOTTLE. IN MY SHORT TIME AT ACR I HAVE EXPERIENCED 1 BOTTLE THAT LEAKED EXCESSIVELY CAUSING ME TO REPLACE THE BOTTLE A SECOND TIME. UPON INSTALLATION OF THE BOTTLE ON ACFT I CONNECTED ALL THE LINES AND TURNED ON THE BOTTLE FULLY MINUS 1/4 TURN. REALIZING I FORGOT LEAK DETECTION FLUID I LEFT THE CARGO PIT TO GET IT FROM MY CART. WHILE OUTSIDE THE ACFT I WAS ASKED FOR HELP FROM ANOTHER MECH. THIS TOOK MY MIND OFF THE TASK AT HAND. UPON RETURNING TO THE PIT I DOUBLE-CHKED MYSELF IN THE WRONG MANNER. I TURNED THE VALVE IN THE WRONG DIRECTION TILL IT STOPPED AND BACKED OFF 1/4 TURN. I DIDN'T REALIZE I WAS TURNING THE VALVE IN THE WRONG DIRECTION AT THE TIME. I PERFORMED THE LEAK CHK AND SECURED THE BOTTLE PER THE MAINT MANUAL. I WIRED THE BOTTLE VALVE IN THIS POS AND CLOSED UP THE ACCESS PANEL. THE COCKPIT OPS CHK WAS PERFORMED PER THE PAPERWORK WITH NO PROBS NOTED. A PLACARD ON THE TOP OR THE SIDE OF THE BOTTLE WITH BOLD PRINT IDENTING ON AND OFF DIRECTIONS FOR THE VALVE COULD HAVE HELPED ME WITH MY MISTAKE. PLACARDS COULD BE PLACED IN THESE POS DEPENDING ON THE INSTALLATION CONFIGN. THERE IS A SMALL PLACARD ON THE VALVE TOP. YOU CAN'T READ IT WHILE YOU WORK AND YOU CAN'T SEE IT AT ALL AFTER BOTTLE INSTALL IN THE B-300 AND B-500 CONFIGN. SUPPLEMENTAL INFO FROM ACN 730283: WHILE PERFORMING MAINT CHK ON ACFT; CREW OXYGEN PRESSURE WAS LOW. MY FELLOW MECH R&R THE OXYGEN BOTTLE AND I PERFORMED THE OPS CHK AND DID NOT NOTICE ANY PROBS. THE ACFT LEFT ZZZ AND WAS IN ZZZ1. THE ACFT WENT OTS THERE. I DO NOT KNOW HOW THIS SITUATION CAN BE IMPROVED OTHER THAN MAKING THE BOTTLE R&R AN RII ITEM.

Data retrieved from NASA's ASRS site as of January 2009 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.