Piper A140 pilot made emergency forced landing off airport at night shortly after takeoff due to not being able to obtain full power from the engine. Carburetor icing was suspected.

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Attributes
ACN	522011
Time
Date	200108
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : 00v.airport
State Reference	CO
Altitude	msl single value : 7000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Piper Aircraft Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude climbout : initial
Flight Plan	None
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 50 flight time total : 490 flight time type : 50
ASRS Report	522011
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : engine rpm other flight crewa
Resolutory Action	flight crew : landed in emergency condition other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance Weather
Primary Problem	Aircraft

Narrative:

Airport elevation 6800 ft MSL taking off to the north. Winds were light from the north. On takeoff, developed a little lower than normal RPM 2150-2200 RPM. Everything seemed normal until the climb, when it was noticed that the airplane was not climbing. Due to the fact it was night, I was not 100% sure how high we were above the ground when clearing power lines off the north end of the field. The ground rises to the north of the field and we were unable to out-climb the terrain. I decided to land the aircraft off field. No injuries and no damage to the aircraft. WX: cool with high humidity (82%). I suspect carburetor ice on takeoff was to blame for the loss of engine performance.

Original NASA ASRS Text

Title: PIPER A140 PLT MADE EMER FORCED LNDG OFF ARPT AT NIGHT SHORTLY AFTER TKOF DUE TO NOT BEING ABLE TO OBTAIN FULL PWR FROM THE ENG. CARB ICING WAS SUSPECTED.

Narrative: ARPT ELEVATION 6800 FT MSL TAKING OFF TO THE N. WINDS WERE LIGHT FROM THE N. ON TKOF, DEVELOPED A LITTLE LOWER THAN NORMAL RPM 2150-2200 RPM. EVERYTHING SEEMED NORMAL UNTIL THE CLB, WHEN IT WAS NOTICED THAT THE AIRPLANE WAS NOT CLBING. DUE TO THE FACT IT WAS NIGHT, I WAS NOT 100% SURE HOW HIGH WE WERE ABOVE THE GND WHEN CLRING PWR LINES OFF THE N END OF THE FIELD. THE GND RISES TO THE N OF THE FIELD AND WE WERE UNABLE TO OUT-CLB THE TERRAIN. I DECIDED TO LAND THE ACFT OFF FIELD. NO INJURIES AND NO DAMAGE TO THE ACFT. WX: COOL WITH HIGH HUMIDITY (82%). I SUSPECT CARB ICE ON TKOF WAS TO BLAME FOR THE LOSS OF ENG PERFORMANCE.

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.