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B777 flight crew reports crew oxygen EICAS indicating 0 pressure while first officer is using it and receiving good flow. Faulty indicator suspected.
| Attributes | |
| ACN | 787424 |
| Time | |
| Date | 200805 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzzz.airport |
| State Reference | FO |
| Altitude | msl single value : 36000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 220 flight time total : 23000 flight time type : 5500 |
| ASRS Report | 787424 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : relief pilot |
| Experience | flight time last 90 days : 234 flight time total : 16000 flight time type : 8900 |
| ASRS Report | 787437 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During crew change; crew oxygen low EICAS message came on and oxygen indicated 0. First officer was wearing mask and had normal inflation and pressure. While PF's reviewed checklists; relief first officer checked crew bottle in east&east compartment and indicated that crew oxygen bottle pressure was 1500 pounds and valve was safetied open. We contacted dispatch and maintenance for any additional advice. The result was a probable indicator problem and the item was logged. One concern was that the checklist does not address possible indicator problem and the other indications such as normal mask inflation and mask pressure. Our investigation was accomplished only from past experience. If we followed the checklist by word we would have made high dive and diverted. The status page later showed fluctuating oxygen pressure.
Original NASA ASRS Text
Title: B777 FLT CREW REPORTS CREW OXYGEN EICAS INDICATING 0 PRESSURE WHILE FO IS USING IT AND RECEIVING GOOD FLOW. FAULTY INDICATOR SUSPECTED.
Narrative: DURING CREW CHANGE; CREW OXYGEN LOW EICAS MESSAGE CAME ON AND OXYGEN INDICATED 0. FO WAS WEARING MASK AND HAD NORMAL INFLATION AND PRESSURE. WHILE PF'S REVIEWED CHKLISTS; RELIEF FO CHKED CREW BOTTLE IN E&E COMPARTMENT AND INDICATED THAT CREW OXYGEN BOTTLE PRESSURE WAS 1500 LBS AND VALVE WAS SAFETIED OPEN. WE CONTACTED DISPATCH AND MAINT FOR ANY ADDITIONAL ADVICE. THE RESULT WAS A PROBABLE INDICATOR PROB AND THE ITEM WAS LOGGED. ONE CONCERN WAS THAT THE CHKLIST DOES NOT ADDRESS POSSIBLE INDICATOR PROB AND THE OTHER INDICATIONS SUCH AS NORMAL MASK INFLATION AND MASK PRESSURE. OUR INVESTIGATION WAS ACCOMPLISHED ONLY FROM PAST EXPERIENCE. IF WE FOLLOWED THE CHKLIST BY WORD WE WOULD HAVE MADE HIGH DIVE AND DIVERTED. THE STATUS PAGE LATER SHOWED FLUCTUATING OXYGEN PRESSURE.
Data retrieved from NASA's ASRS site as of May 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.