Air carrier maintenance personnel fail to replace oil filler cap after inspection.

Attributes
ACN	132038
Time
Date	198912
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sbn
State Reference	IN
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	ground : preflight
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	132038
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Airport
Air Traffic Incident	other

Narrative:

I performed a line check on an mdt and found that oil was needed, so I brought the qtys up to the correct capacity. I finished the line check and the aircraft was boarded and left the gate. As it taxied to the runway, the left engine went into feather and had a low pressure indication. It then returned to the gate and inspection revealed that the oil fill cap was off (causing oil to be pumped overboard). The oil level was then brought back up and the aircraft was returned to service with no damage noted. This was the second mdt line check I had performed, and I was very unfamiliar with the aircraft and had not been schooled on it yet. In trying to be extra careful and not miss anything on the line check, I apparently forgot the simple and failed to replace the oil cap.

Original NASA ASRS Text

Title: ACR MAINTENANCE PERSONNEL FAIL TO REPLACE OIL FILLER CAP AFTER INSPECTION.

Narrative: I PERFORMED A LINE CHK ON AN MDT AND FOUND THAT OIL WAS NEEDED, SO I BROUGHT THE QTYS UP TO THE CORRECT CAPACITY. I FINISHED THE LINE CHK AND THE ACFT WAS BOARDED AND LEFT THE GATE. AS IT TAXIED TO THE RWY, THE LEFT ENG WENT INTO FEATHER AND HAD A LOW PRESSURE INDICATION. IT THEN RETURNED TO THE GATE AND INSPECTION REVEALED THAT THE OIL FILL CAP WAS OFF (CAUSING OIL TO BE PUMPED OVERBOARD). THE OIL LEVEL WAS THEN BROUGHT BACK UP AND THE ACFT WAS RETURNED TO SVC WITH NO DAMAGE NOTED. THIS WAS THE SECOND MDT LINE CHK I HAD PERFORMED, AND I WAS VERY UNFAMILIAR WITH THE ACFT AND HAD NOT BEEN SCHOOLED ON IT YET. IN TRYING TO BE EXTRA CAREFUL AND NOT MISS ANYTHING ON THE LINE CHK, I APPARENTLY FORGOT THE SIMPLE AND FAILED TO REPLACE THE OIL CAP.

Data retrieved from NASA's ASRS site as of August 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.