A B757-200 was dispatched in non compliance with #2 engine oil tank filler cap seal loose and worn which resulted in cap coming off causing loss of oil.

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Attributes
ACN	482336
Time
Date	200008
Day	Fri
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	B757-200
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
Experience	maintenance avionics : 10 maintenance technician : 10
ASRS Report	482336
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : engine oil quantity ind. other other : person 2
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : lighting performance deficiency : inspection performance deficiency : logbook entry
Supplementary
Problem Areas	Aircraft Environmental Factor Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

While servicing #1 engine oil, I added 2 pints and installed the oil cap. It was a loose fit. I pulled the cap off and inspected the o-ring. It looked fine. I installed the cap still feeling somewhat loose. I doublechked prior to closing the access door. Aircraft flew to sea. Upon arrival mechanics found oil leak. Found cap not installed. I feel that it came off in-flight due to a loose fit. O-ring more than likely needed to be changed.

Original NASA ASRS Text

Title: A B757-200 WAS DISPATCHED IN NON COMPLIANCE WITH #2 ENG OIL TANK FILLER CAP SEAL LOOSE AND WORN WHICH RESULTED IN CAP COMING OFF CAUSING LOSS OF OIL.

Narrative: WHILE SVCING #1 ENG OIL, I ADDED 2 PINTS AND INSTALLED THE OIL CAP. IT WAS A LOOSE FIT. I PULLED THE CAP OFF AND INSPECTED THE O-RING. IT LOOKED FINE. I INSTALLED THE CAP STILL FEELING SOMEWHAT LOOSE. I DOUBLECHKED PRIOR TO CLOSING THE ACCESS DOOR. ACFT FLEW TO SEA. UPON ARR MECHS FOUND OIL LEAK. FOUND CAP NOT INSTALLED. I FEEL THAT IT CAME OFF INFLT DUE TO A LOOSE FIT. O-RING MORE THAN LIKELY NEEDED TO BE CHANGED.

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.