ATR42 had in-flight engine shutdown due to the oil filler apt not being replaced by maintenance.

Attributes
ACN	433558
Time
Date	199904
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : ord.vor
State Reference	IL
Altitude	msl single value : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc
Operator	common carrier : air carrier
Make Model Name	ATR 42
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 100 flight time total : 9700 flight time type : 4900
ASRS Report	433558
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance
Independent Detector	aircraft equipment other aircraft equipment : oil pressure light other flight crewa other flight crewb
Resolutory Action	flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Maintenance Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

ATR42, 39 souls on board. Nearing ord airspace, an intermittent #1 engine low oil pressure alert was generated. A subsequent engine shutdown was performed in response to aircraft operating manual review. An uneventful landing was performed at ord. Maintenance investigation revealed that oil filler cap had not been reinstalled after maintenance performed on overnight airplane.

Original NASA ASRS Text

Title: ATR42 HAD INFLT ENG SHUTDOWN DUE TO THE OIL FILLER APT NOT BEING REPLACED BY MAINT.

Narrative: ATR42, 39 SOULS ON BOARD. NEARING ORD AIRSPACE, AN INTERMITTENT #1 ENG LOW OIL PRESSURE ALERT WAS GENERATED. A SUBSEQUENT ENG SHUTDOWN WAS PERFORMED IN RESPONSE TO ACFT OPERATING MANUAL REVIEW. AN UNEVENTFUL LNDG WAS PERFORMED AT ORD. MAINT INVESTIGATION REVEALED THAT OIL FILLER CAP HAD NOT BEEN REINSTALLED AFTER MAINT PERFORMED ON OVERNIGHT AIRPLANE.

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.