GA small aircraft forced landing due loss of power as a result of carburetor ice.

Attributes
ACN	92170
Time
Date	198808
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : 45m
State Reference	OK
Altitude	agl bound lower : 0 agl bound upper : 3500
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lga
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 25 flight time total : 99 flight time type : 21
ASRS Report	92170
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

While in cruise mode descended from 5000' to 3500', upon leveling off, engine RPM's began dropping. I tried switching fuel tanks, turned on boost pump, applied carburetor heat--nothing would get power back. Picked out suitable landing site and landed at that site. Power just faded away. I believe the problem was caused by carburetor in build up when I descended from 5000 to 3500'. By the time I noticed I had a problem, there was no chance to get power back because I had too much carburetor ice build up by that time.

Original NASA ASRS Text

Title: GA SMA FORCED LNDG DUE LOSS OF POWER AS A RESULT OF CARBURETOR ICE.

Narrative: WHILE IN CRUISE MODE DSNDED FROM 5000' TO 3500', UPON LEVELING OFF, ENG RPM'S BEGAN DROPPING. I TRIED SWITCHING FUEL TANKS, TURNED ON BOOST PUMP, APPLIED CARB HEAT--NOTHING WOULD GET PWR BACK. PICKED OUT SUITABLE LNDG SITE AND LANDED AT THAT SITE. PWR JUST FADED AWAY. I BELIEVE THE PROB WAS CAUSED BY CARB IN BUILD UP WHEN I DSNDED FROM 5000 TO 3500'. BY THE TIME I NOTICED I HAD A PROB, THERE WAS NO CHANCE TO GET PWR BACK BECAUSE I HAD TOO MUCH CARB ICE BUILD UP BY THAT TIME.

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