A B757-200 returned to the field due to #1 engine loss of oil pressure and quantity caused by the oil filler cap not secured.

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Attributes
ACN	412955
Time
Date	199808
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	412955
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : detected after the fact other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On the morning of aug/xa/98, flight xyz from ZZZ to sju air- interrupted due to low oil pressure, causing the crew to shut down the left engine and return to the station. Upon further examination of the engine, it was found that the oil cap was off. The preceding night I had the task of conducting the inspection and servicing of that engine. I svced the engine with 1 pint of oil. To the best of my knowledge, I replaced the cap on the engine.

Original NASA ASRS Text

Title: A B757-200 RETURNED TO THE FIELD DUE TO #1 ENG LOSS OF OIL PRESSURE AND QUANTITY CAUSED BY THE OIL FILLER CAP NOT SECURED.

Narrative: ON THE MORNING OF AUG/XA/98, FLT XYZ FROM ZZZ TO SJU AIR- INTERRUPTED DUE TO LOW OIL PRESSURE, CAUSING THE CREW TO SHUT DOWN THE L ENG AND RETURN TO THE STATION. UPON FURTHER EXAMINATION OF THE ENG, IT WAS FOUND THAT THE OIL CAP WAS OFF. THE PRECEDING NIGHT I HAD THE TASK OF CONDUCTING THE INSPECTION AND SVCING OF THAT ENG. I SVCED THE ENG WITH 1 PINT OF OIL. TO THE BEST OF MY KNOWLEDGE, I REPLACED THE CAP ON THE ENG.

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.