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EMB145 flight crew is dispatched with the observer seat MEL'ed apparently due to low oxygen level; yet the oxygen had been serviced to full. After landing the crew is informed that an oxygen leak was suspected and the aircraft should not have been flown.
| Attributes | |
| ACN | 990669 |
| Time | |
| Date | 201201 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 145 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Commercial |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
After performing successfully all first flight of the day checks (which included O2 pressure level and O2 mask); I proceeded with the logbook review. Upon review of it; I noticed that MEL 25-10 (observer seat and equipment) was still open despite the oxygen pressure level being at optimum range. The entry referring to low level O2 had been previously balanced and didn't mention anything related to a leak; it actually only mentioned the cockpit O2 to be below the required level; and the balancing entry was 'O2 serviced to 1;800 psi'. After calling maintenance to ask about the reason for MEL 25-10 being still open despite the O2 level found to be within required range; he replied they were not required to clear that MEL until the next PS2. Upon arrival we were informed by our chief pilot of a maintenance discrepancy found relating a possible O2 leak on our aircraft. During preflight; in cruise and after landing 02 pressure level was always found to be above 1;750 psi.
Original NASA ASRS Text
Title: EMB145 flight crew is dispatched with the observer seat MEL'ed apparently due to low oxygen level; yet the oxygen had been serviced to full. After landing the crew is informed that an oxygen leak was suspected and the aircraft should not have been flown.
Narrative: After performing successfully all first flight of the day checks (which included O2 pressure level and O2 Mask); I proceeded with the logbook review. Upon review of it; I noticed that MEL 25-10 (observer seat and equipment) was still open despite the oxygen pressure level being at optimum range. The entry referring to Low Level O2 had been previously balanced and didn't mention anything related to a leak; it actually only mentioned the cockpit O2 to be below the required level; and the balancing entry was 'O2 serviced to 1;800 PSI'. After calling Maintenance to ask about the reason for MEL 25-10 being still open despite the O2 Level found to be within required range; he replied they were not required to clear that MEL until the next PS2. Upon arrival we were informed by our Chief Pilot of a Maintenance discrepancy found relating a possible O2 leak on our aircraft. During preflight; in cruise and after landing 02 pressure level was always found to be above 1;750 PSI.
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.