Aircraft equipment problem mandates a return land at departure airport.

Attributes
ACN	303646
Time
Date	199505
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : con
State Reference	NH
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : lax
Operator	general aviation : instructional
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other other other
Route In Use	enroute airway : mht
Flight Plan	IFR
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 1200 flight time type : 500
ASRS Report	303646
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : private
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:

IFR training flight, oil temperature got in red line after approximately 20 mins into flight, at 1/2 way point between concord, nh, and laconia, the departure point. I advised ATC to cancel IFR with advisories to laconia. Kept altitude as a precautionary measure until the plane reached airport. Landed without incident. Engine was fine. Cause: oil cooler air hose became disconnected, possibly due to 100 hour inspection that was recently completed.

Original NASA ASRS Text

Title: ACFT EQUIP PROB MANDATES A RETURN LAND AT DEP ARPT.

Narrative: IFR TRAINING FLT, OIL TEMP GOT IN RED LINE AFTER APPROX 20 MINS INTO FLT, AT 1/2 WAY POINT BTWN CONCORD, NH, AND LACONIA, THE DEP POINT. I ADVISED ATC TO CANCEL IFR WITH ADVISORIES TO LACONIA. KEPT ALT AS A PRECAUTIONARY MEASURE UNTIL THE PLANE REACHED ARPT. LANDED WITHOUT INCIDENT. ENG WAS FINE. CAUSE: OIL COOLER AIR HOSE BECAME DISCONNECTED, POSSIBLY DUE TO 100 HR INSPECTION THAT WAS RECENTLY COMPLETED.

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.