<< >> NASA ASRS Report 791199, June 2008

Pilot of aircraft with liquid cooled engine had loss of coolant quantity and a pegged main coolant temperature gauge; elected to declare an emergency and land. Subsequent maintenance discovery determined it was an indication error.

Attributes
ACN	791199
Time
Date	200806
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 9500
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	general aviation : personal
Make Model Name	Military Trainer
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : multi engine pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 60 flight time total : 16500 flight time type : 60
ASRS Report	791199
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : landed in emergency condition
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

In flight had an indication of loss of coolant; on other indications other than full pegged hot main coolant temperature; auxiliary coolant temperature normal; coolant pressure normal; elected to declare an emergency for safety and handling with ZZZ tower as it was the closest airport. Controller gave just the right amount of information and made it a non-event. The owners' mechanic was summoned; determined it was a false indication; coolant level normal; aircraft flown back to ZZZ1.

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Original NASA ASRS Text

Title: PLT OF ACFT WITH LIQUID COOLED ENGINE HAD LOSS OF COOLANT QUANTITY AND A PEGGED MAIN COOLANT TEMP GAUGE; ELECTED TO DECLARE AN EMERGENCY AND LAND. SUBSEQUENT MAINTENANCE DISCOVERY DETERMINED IT WAS AN INDICATION ERROR.

Narrative: IN FLT HAD AN INDICATION OF LOSS OF COOLANT; ON OTHER INDICATIONS OTHER THAN FULL PEGGED HOT MAIN COOLANT TEMP; AUX COOLANT TEMP NORMAL; COOLANT PRESSURE NORMAL; ELECTED TO DECLARE AN EMER FOR SAFETY AND HANDLING WITH ZZZ TWR AS IT WAS THE CLOSEST ARPT. CTLR GAVE JUST THE RIGHT AMOUNT OF INFO AND MADE IT A NON-EVENT. THE OWNERS' MECH WAS SUMMONED; DETERMINED IT WAS A FALSE INDICATION; COOLANT LEVEL NORMAL; ACFT FLOWN BACK TO ZZZ1.

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