During a training flight small aircraft engine lost oil resulting in an off airport forced landing.

Attributes
ACN	285806
Time
Date	199410
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : anx airport : mu20
State Reference	MO
Altitude	agl bound lower : 800 agl bound upper : 800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	other personnel other
Qualification	other other : other
ASRS Report	285806
Person 2
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : commercial pilot : cfi
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

During cruise, pilot noted loss of oil pressure, made off field landing and shut engine down after landing completed. Investigation showed loss of oil pressure caused by loss of engine oil caused by the oil sump screen backing out. Screen was not properly torqued or saftied. Require co- worker to inspect work as a second set of eyes helps prevent this type of problem.

Original NASA ASRS Text

Title: DURING A TRAINING FLT SMA ENG LOST OIL RESULTING IN AN OFF ARPT FORCED LNDG.

Narrative: DURING CRUISE, PLT NOTED LOSS OF OIL PRESSURE, MADE OFF FIELD LNDG AND SHUT ENG DOWN AFTER LNDG COMPLETED. INVESTIGATION SHOWED LOSS OF OIL PRESSURE CAUSED BY LOSS OF ENG OIL CAUSED BY THE OIL SUMP SCREEN BACKING OUT. SCREEN WAS NOT PROPERLY TORQUED OR SAFTIED. REQUIRE CO- WORKER TO INSPECT WORK AS A SECOND SET OF EYES HELPS PREVENT THIS TYPE OF PROB.

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.