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A B767-300 crew found on oxygen mask check that pressure decreased. Found oxygen bottle valve not fully opened after servicing.
| Attributes | |
| ACN | 592260 |
| Time | |
| Date | 200308 |
| Day | Tue |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 12 |
| ASRS Report | 592260 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : crew oxygen press indicator other flight crewa other flight crewb |
| Resolutory Action | other |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : testing performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Environmental Factor |
| Primary Problem | Maintenance Human Performance |
Narrative:
During layover check, crew oxygen was found below limits. Crew oxygen was svced. During predep checks, the pilot reported crew oxygen slowly decreases during crew mask check, then returns to normal pressure. Crew oxygen bottle was found not fully opened. Bottle was opened fully and safetied.
Original NASA ASRS Text
Title: A B767-300 CREW FOUND ON OXYGEN MASK CHK THAT PRESSURE DECREASED. FOUND OXYGEN BOTTLE VALVE NOT FULLY OPENED AFTER SVCING.
Narrative: DURING LAYOVER CHK, CREW OXYGEN WAS FOUND BELOW LIMITS. CREW OXYGEN WAS SVCED. DURING PREDEP CHKS, THE PLT RPTED CREW OXYGEN SLOWLY DECREASES DURING CREW MASK CHK, THEN RETURNS TO NORMAL PRESSURE. CREW OXYGEN BOTTLE WAS FOUND NOT FULLY OPENED. BOTTLE WAS OPENED FULLY AND SAFETIED.
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.