Narrative:

Flight crew calls that crew oxygen (O2) is at 750 psi. I signed it off as it was well within limits of 3-man crew. 17 minutes later; crew repeats write-up indicating crew O2 at 500 psi. At this point; we are left to believe the aircraft system has developed a leak or crew intentionally and deliberately depleted the system to fulfill his demands. This is a serious matter; as we followed MEL/aircraft maintenance manual FAA established procedures to sign off the discrepancy. It is so apparent that flight operations has total disregard to these FAA approved dispatch guidelines and will demand a repair/correction as they see fit. If we are going to go the route of appeasing the flight crews; then why have these dispatch guidelines available? We might as well remove the MEL manual from all the fleets; as they [flight operations] will do as they please; and refuse an aircraft that is totally legal to fly...only by saying it's a safety matter or any other excuse they see fit. Upon arrival to the aircraft about 30 minutes later to prepare to service the oxygen; it was noted that the bottle pressure had not dropped anymore and was instead at 625 psi; down from the original 750 psi originally reported. However; even this drop in pressure warranted a thorough leak check of the lines and system.suggestions: remove the MEL from our manuals or reprimand pilots who refuse to follow established FAA dispatch guidelines. There must be some accountability held against flight operations as there are against operations and every other workgroup in the company. Also; a bulletin needs to be issued and signed as read; as we have [paper trail] to the entire flight operation group of this. We are not here to delay our customers but to get them to their destinations within the safe parameters that have already been established by the FAA/NTSB.

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Original NASA ASRS Text

Title: A Maintenance Technician reported that the flight crew inaccurately wrote-up the crew oxygen required servicing after it was signed-off as being within limits.

Narrative: Flight crew calls that crew oxygen (O2) is at 750 PSI. I signed it off as it was well within limits of 3-man crew. 17 minutes later; crew repeats write-up indicating crew O2 at 500 PSI. At this point; we are left to believe the aircraft system has developed a leak or crew intentionally and deliberately depleted the system to fulfill his demands. This is a serious matter; as we followed MEL/Aircraft Maintenance Manual FAA established procedures to sign off the discrepancy. It is so apparent that Flight Operations has total disregard to these FAA approved dispatch guidelines and will demand a repair/correction as they see fit. If we are going to go the route of appeasing the flight crews; then why have these dispatch guidelines available? We might as well remove the MEL manual from all the fleets; as they [Flight operations] will do as they please; and refuse an aircraft that is totally legal to fly...only by saying it's a safety matter or any other excuse they see fit. Upon arrival to the aircraft about 30 minutes later to prepare to service the oxygen; it was noted that the bottle pressure had not dropped anymore and was instead at 625 PSI; down from the original 750 PSI originally reported. However; even this drop in pressure warranted a thorough leak check of the lines and system.Suggestions: Remove the MEL from our manuals or reprimand pilots who refuse to follow established FAA dispatch guidelines. There must be some accountability held against Flight Operations as there are against Operations and every other workgroup in the company. Also; a bulletin needs to be issued and signed as read; as we have [paper trail] to the entire Flight Operation group of this. We are not here to delay our customers but to get them to their destinations within the safe parameters that have already been established by the FAA/NTSB.

Data retrieved from NASA's ASRS site 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.