<< >> NASA ASRS Report 471354, April 2000

A B727-200 in cruise at FL330 experiences flight crew loss of oxygen and descends to minimum en route altitude. Cause of oxygen loss unknown.

Attributes
ACN	471354
Time
Date	200004
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : slc.airport
State Reference	UT
Altitude	msl bound lower : 31000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc.artcc
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 4500 flight time type : 2600
ASRS Report	471354
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : crew oxygen pressure indicator other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance none taken : anomaly accepted
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

Approximately 15 mins west of denver, so noticed crew oxygen level at zero. We were overhead the continental divide, rocky mountains, and elected to descend via ZLC control to MEA (16000 ft MSL) to preempt an emergency descent in the event of a subsequent pressurization failure (10000 ft later altitude would bring oxygen masks out of the ceiling) did not declare an emergency. Proceeded at MEA to slc (final destination) and to uneventful landing. Maintenance actual leak check of crew oxygen system results to be determined.

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Original NASA ASRS Text

Title: A B727-200 IN CRUISE AT FL330 EXPERIENCES FLC LOSS OF OXYGEN AND DSNDS TO MINIMUM ENRTE ALT. CAUSE OF OXYGEN LOSS UNKNOWN.

Narrative: APPROX 15 MINS W OF DENVER, SO NOTICED CREW OXYGEN LEVEL AT ZERO. WE WERE OVERHEAD THE CONTINENTAL DIVIDE, ROCKY MOUNTAINS, AND ELECTED TO DSND VIA ZLC CTL TO MEA (16000 FT MSL) TO PREEMPT AN EMER DSCNT IN THE EVENT OF A SUBSEQUENT PRESSURIZATION FAILURE (10000 FT LATER ALT WOULD BRING OXYGEN MASKS OUT OF THE CEILING) DID NOT DECLARE AN EMER. PROCEEDED AT MEA TO SLC (FINAL DEST) AND TO UNEVENTFUL LNDG. MAINT ACTUAL LEAK CHK OF CREW OXYGEN SYS RESULTS TO BE DETERMINED.

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.