A fokker 100 on overnight layover check was alleged to have crew oxygen bottle incorrectly svced.

Attributes
ACN	461878
Time
Date	199911
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Flight Phase	ground : parked ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
ASRS Report	461878
Person 2
Affiliation	government : faa
Function	observation : air carrier inspector
Qualification	technician : powerplant technician : airframe
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure
Independent Detector	other other : 2
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : scheduled maintenance
Supplementary
Problem Areas	Environmental Factor Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

I was notified by the FAA that the 'a' check I accomplished on aircraft xyz had a discrepancy with the crew oxygen bottle pressure, at the time I check the pressure it was 1600 psi, the cockpit temperature was 90 degrees at XA00. After connecting the jetbridge conditioned air, the temperature began dropping at XE00. When I put the logbook on board the temperature was at 47 degrees. I think possibly the 40 degree drop in temperature would account for the oxygen pressure discrepancy.

Original NASA ASRS Text

Title: A FOKKER 100 ON OVERNIGHT LAYOVER CHK WAS ALLEGED TO HAVE CREW OXYGEN BOTTLE INCORRECTLY SVCED.

Narrative: I WAS NOTIFIED BY THE FAA THAT THE 'A' CHK I ACCOMPLISHED ON ACFT XYZ HAD A DISCREPANCY WITH THE CREW OXYGEN BOTTLE PRESSURE, AT THE TIME I CHK THE PRESSURE IT WAS 1600 PSI, THE COCKPIT TEMP WAS 90 DEGS AT XA00. AFTER CONNECTING THE JETBRIDGE CONDITIONED AIR, THE TEMP BEGAN DROPPING AT XE00. WHEN I PUT THE LOGBOOK ON BOARD THE TEMP WAS AT 47 DEGS. I THINK POSSIBLY THE 40 DEG DROP IN TEMP WOULD ACCOUNT FOR THE OXYGEN PRESSURE DISCREPANCY.

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.