Traffic watch aircraft forced landing on highway.

Attributes
ACN	135618
Time
Date	199002
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : nkx
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 3500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : san
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Route In Use	approach : visual
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : commercial
Experience	flight time last 90 days : 80 flight time total : 320 flight time type : 120
ASRS Report	135618
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:

I was cruising at 3500' on a routine traffic watch flight when I suddenly lost power and made an emergency landing on I-15 southbound. Due to the combination of atmospheric conditions and low power setting, I was operating at 2100 RPM. I feel that I encountered carburetor icing. I will in the future use carburetor heat at least every 15 mins as a precautionary measure, rather than wait for detectable signs of carburetor icing.

Original NASA ASRS Text

Title: TRAFFIC WATCH ACFT FORCED LNDG ON HIGHWAY.

Narrative: I WAS CRUISING AT 3500' ON A ROUTINE TFC WATCH FLT WHEN I SUDDENLY LOST PWR AND MADE AN EMER LNDG ON I-15 SBND. DUE TO THE COMBINATION OF ATMOSPHERIC CONDITIONS AND LOW PWR SETTING, I WAS OPERATING AT 2100 RPM. I FEEL THAT I ENCOUNTERED CARB ICING. I WILL IN THE FUTURE USE CARB HEAT AT LEAST EVERY 15 MINS AS A PRECAUTIONARY MEASURE, RATHER THAN WAIT FOR DETECTABLE SIGNS OF CARB ICING.

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.