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New style oxygen mask on B777 does not have enough pressure in the harness to expand it for quick donning.
| Attributes | |
| ACN | 474106 |
| Time | |
| Date | 200005 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 1000 flight time type : 120 |
| ASRS Report | 474106 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
When oxygen mask removed from storage area, the head band did not expand for quick donning. The strap was in the goggle area and had to be pulled from that area before it deployed. This mask was one of the new gray masks on the 777. It appears that the pressure in the head band area is less than that on the tan mask. I had the first officer remove his mask just to check that I did not have a bad mask. The results were the same, the head strap had to be pulled out of the goggle area before it would deploy for quick donning. Also, these masks fit tighter in the storage area and it seems impossible to put the mask back into the box without putting the strap in the goggle area. Callback conversation with reporter revealed the following information: reporter did not know new make or model number of the mask involved. The face mask goggle part of it is larger and the expanded head harness was too limp to put quickly over the head as it should be. He said he has reported it to the company fleet manager and they are looking into it. It was also noted that this was a newly delivered aircraft.
Original NASA ASRS Text
Title: NEW STYLE OXYGEN MASK ON B777 DOES NOT HAVE ENOUGH PRESSURE IN THE HARNESS TO EXPAND IT FOR QUICK DONNING.
Narrative: WHEN OXYGEN MASK REMOVED FROM STORAGE AREA, THE HEAD BAND DID NOT EXPAND FOR QUICK DONNING. THE STRAP WAS IN THE GOGGLE AREA AND HAD TO BE PULLED FROM THAT AREA BEFORE IT DEPLOYED. THIS MASK WAS ONE OF THE NEW GRAY MASKS ON THE 777. IT APPEARS THAT THE PRESSURE IN THE HEAD BAND AREA IS LESS THAN THAT ON THE TAN MASK. I HAD THE FO REMOVE HIS MASK JUST TO CHK THAT I DID NOT HAVE A BAD MASK. THE RESULTS WERE THE SAME, THE HEAD STRAP HAD TO BE PULLED OUT OF THE GOGGLE AREA BEFORE IT WOULD DEPLOY FOR QUICK DONNING. ALSO, THESE MASKS FIT TIGHTER IN THE STORAGE AREA AND IT SEEMS IMPOSSIBLE TO PUT THE MASK BACK INTO THE BOX WITHOUT PUTTING THE STRAP IN THE GOGGLE AREA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR DID NOT KNOW NEW MAKE OR MODEL NUMBER OF THE MASK INVOLVED. THE FACE MASK GOGGLE PART OF IT IS LARGER AND THE EXPANDED HEAD HARNESS WAS TOO LIMP TO PUT QUICKLY OVER THE HEAD AS IT SHOULD BE. HE SAID HE HAS RPTED IT TO THE COMPANY FLEET MGR AND THEY ARE LOOKING INTO IT. IT WAS ALSO NOTED THAT THIS WAS A NEWLY DELIVERED ACFT.
Data retrieved from NASA's ASRS site as of July 2007 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.