Portable oxygen bottle full face mask was found to be missing after a flight.

Attributes
ACN	287852
Time
Date	199411
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : geg
State Reference	WA
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	287852
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure non adherence : far other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While performing the initial preflight and cockpit safety check of the day I failed to notice that the full face oxygen mask had been removed from the crew portable oxygen bottle. In fact the mask had been removed from the aircraft. The error was discovered by the crew that took the aircraft from us later in the day. The checklist reads 'crew portable oxygen and mask' on one line. During the safety check I did preflight the crew portable bottle and pressure. Perhaps making 2 checklists items on 2 lines would make this easier to perform.

Original NASA ASRS Text

Title: PORTABLE OXYGEN BOTTLE FULL FACE MASK WAS FOUND TO BE MISSING AFTER A FLT.

Narrative: WHILE PERFORMING THE INITIAL PREFLT AND COCKPIT SAFETY CHK OF THE DAY I FAILED TO NOTICE THAT THE FULL FACE OXYGEN MASK HAD BEEN REMOVED FROM THE CREW PORTABLE OXYGEN BOTTLE. IN FACT THE MASK HAD BEEN REMOVED FROM THE ACFT. THE ERROR WAS DISCOVERED BY THE CREW THAT TOOK THE ACFT FROM US LATER IN THE DAY. THE CHKLIST READS 'CREW PORTABLE OXYGEN AND MASK' ON ONE LINE. DURING THE SAFETY CHK I DID PREFLT THE CREW PORTABLE BOTTLE AND PRESSURE. PERHAPS MAKING 2 CHKLISTS ITEMS ON 2 LINES WOULD MAKE THIS EASIER TO PERFORM.

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.