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An M20K in cruise flight at FL210 experienced failure of oxygen system. The pilot descended to 17000 ft using alternate oxygen mask.
| Attributes | |
| ACN | 714671 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zoa.artcc |
| State Reference | CA |
| Altitude | msl single value : 21000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | general aviation : personal |
| Make Model Name | M-20 K (231) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 75 flight time total : 1050 flight time type : 800 |
| ASRS Report | 714671 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : exited adverse environment flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
At FL210 in an unpressurized piston aircraft; the ship's oxygen system failed. Immediate action was taken to descend from FL210 to 17000 ft while donning an alternate oxygen mask. After beginning the descent and donning the alternate oxygen mask; ATC was notified. The remainder of the flight was uneventful.
Original NASA ASRS Text
Title: AN M20K IN CRUISE FLT AT FL210 EXPERIENCED FAILURE OF OXYGEN SYS. THE PLT DSNDED TO 17000 FT USING ALTERNATE OXYGEN MASK.
Narrative: AT FL210 IN AN UNPRESSURIZED PISTON ACFT; THE SHIP'S OXYGEN SYS FAILED. IMMEDIATE ACTION WAS TAKEN TO DSND FROM FL210 TO 17000 FT WHILE DONNING AN ALTERNATE OXYGEN MASK. AFTER BEGINNING THE DSCNT AND DONNING THE ALTERNATE OXYGEN MASK; ATC WAS NOTIFIED. THE REMAINDER OF THE FLT WAS UNEVENTFUL.
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.