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A B777-200 flight crew early in atlantic crossing notes fluctuating crew oxygen pressure. Aircraft had a history of false oxygen pressure warnings; so after discussion with maintenance and dispatch; the flight continued.
| Attributes | |
| ACN | 745459 |
| Time | |
| Date | 200707 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zzzz.artcc |
| State Reference | FO |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| 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 : 240 flight time total : 21260 flight time type : 4500 |
| ASRS Report | 745459 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : eicas other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
At cruise beginning atlantic crossing; we received an EICAS message that crew oxygen was low. Status page indicated zero. We knew this aircraft had a previous history of fluctuating false oxygen indication. Conferenced with maintenance and dispatch after confirming good oxygen pressure at all cockpit stations. With their concurrence elected to continue as scheduled with faulty quantity/pressure indication. Approximately 30 mins later; indication began to fluctuate between zero and 1540 psi. By the end of flight it stabilized again at 1540 psi normal indication. We had pre-positioned 2 portable oxygen cylinders from the cabin as a backup.
Original NASA ASRS Text
Title: A B777-200 FLT CREW EARLY IN ATLANTIC CROSSING NOTES FLUCTUATING CREW OXYGEN PRESSURE. ACFT HAD A HISTORY OF FALSE OXYGEN PRESSURE WARNINGS; SO AFTER DISCUSSION WITH MAINTENANCE AND DISPATCH; THE FLIGHT CONTINUED.
Narrative: AT CRUISE BEGINNING ATLANTIC XING; WE RECEIVED AN EICAS MESSAGE THAT CREW OXYGEN WAS LOW. STATUS PAGE INDICATED ZERO. WE KNEW THIS ACFT HAD A PREVIOUS HISTORY OF FLUCTUATING FALSE OXYGEN INDICATION. CONFERENCED WITH MAINT AND DISPATCH AFTER CONFIRMING GOOD OXYGEN PRESSURE AT ALL COCKPIT STATIONS. WITH THEIR CONCURRENCE ELECTED TO CONTINUE AS SCHEDULED WITH FAULTY QUANTITY/PRESSURE INDICATION. APPROX 30 MINS LATER; INDICATION BEGAN TO FLUCTUATE BTWN ZERO AND 1540 PSI. BY THE END OF FLT IT STABILIZED AGAIN AT 1540 PSI NORMAL INDICATION. WE HAD PRE-POSITIONED 2 PORTABLE OXYGEN CYLINDERS FROM THE CABIN AS A BACKUP.
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.