NTSB Identification: CHI96LA203.
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Accident occurred Saturday, June 15, 1996 in OSLO, MN
Probable Cause Approval Date: 12/16/1996
Aircraft: Schweizer G164B, registration: N36311
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The aerial application flight experienced a gradual power loss during its initial climbout from takeoff. The pilot landed in a field with a soft surface. The airplane nosed over upon touchdown. Examination of the airplane's engine revealed no mechanical aniomalies that would prevent the prodiuction of normal power. The pilot said he had fueled the airplane and checked for water in the fuel before takeoff. He said he had not encountered carburetor ice during previous takeoffs earlier in the day. The pilot said the engine had hesitated on takeoff during the past 2 to 3 weeks. He said it did this on a random basis. The pilot said the airplane's engine had been idling about 5 minutes before takeoff. He said he did not apply carburetor heat when he noticed the power loss. According to an FAA carburetor icing probability chart, the temperature/dew point at the accident site posed a serious threat for carburetor icing at low power settings.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

the pilot not using carburetor heat when the engine began to lose power. Factors in this accident were carburetor ice formation and the soft landing surface the pilot had to use for landing.

Full narrative available

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