A B767 had both engines' oil svced by reporter. Aircraft was OTS 2 days for water contamination. First flight diverted due to loss of oil left engine. Found oil cap not secured.

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Attributes
ACN	708128
Time
Date	200608
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	708128
Person 2
Affiliation	company : air carrier
Function	maintenance : lead technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : scheduled maintenance performance deficiency : non compliance with legal requirements performance deficiency : logbook entry
Supplementary
Problem Areas	Aircraft Chart Or Publication Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Performed oil service for aircraft X on aug/xa/06. A check aircraft OTS for potable water contamination and did not fly until aug/xb/06. Was informed by my supervisor on aug/xc/06 aircraft had left engine oil loss causing air-interrupt -- upon aircraft return; oil cap found off. Company instituted maintenance investigation and action. Aircraft OTS and worked on by other shifts prior to flight. Oils are normally checked by fueling at gate.

Original NASA ASRS Text

Title: A B767 HAD BOTH ENGS' OIL SVCED BY RPTR. ACFT WAS OTS 2 DAYS FOR WATER CONTAMINATION. FIRST FLT DIVERTED DUE TO LOSS OF OIL L ENG. FOUND OIL CAP NOT SECURED.

Narrative: PERFORMED OIL SVC FOR ACFT X ON AUG/XA/06. A CHK ACFT OTS FOR POTABLE WATER CONTAMINATION AND DID NOT FLY UNTIL AUG/XB/06. WAS INFORMED BY MY SUPVR ON AUG/XC/06 ACFT HAD L ENG OIL LOSS CAUSING AIR-INTERRUPT -- UPON ACFT RETURN; OIL CAP FOUND OFF. COMPANY INSTITUTED MAINT INVESTIGATION AND ACTION. ACFT OTS AND WORKED ON BY OTHER SHIFTS PRIOR TO FLT. OILS ARE NORMALLY CHKED BY FUELING AT GATE.

Data retrieved from NASA's ASRS site as of January 2009 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.