NTSB Identification: ATL88LA206.
The docket is stored on NTSB microfiche number 37462.
Accident occurred Friday, July 01, 1988 in SPRING CREEK, NC
Probable Cause Approval Date: 09/11/1989
Aircraft: CESSNA 172M, registration: N1534V
Injuries: 3 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 PLT REPORTED THAT THE ENGINE BEGAN TO RUN ROUGH & LOSE POWER AS THE AIRPLANE CLIMBED THROUGH 9,000 FT MSL. SHE THEN SWITCHED FUEL TANKS AND MOVED THE MIXTURE TO FULL RICH, BUT THE ENGINE CONTINUED TO LOSE POWER. CARB HEAT WAS NOT USED AT ANY TIME. A FORCED LDG WAS SUBSEQUENTLY MADE IN A FIELD WHERE THE AIRPLANE COLLIDED WITH A UTILITY POLE AND A DITCH. POST-CRASH EXAM OF THE ENGINE REVEALED NO EVIDENCE OF PREEXISTING MECHANICAL FAILURE OR MALFUNCTION. EXAMINATION OF AN ICING PROBABILITY CHART REVEALED THAT THE REPORTED WX CONDITIONS IN THE AREA WERE FAVORABLE FOR THE FORMATION OF MODERATE CARBURETOR ICING AT CRUISE POWER. THE CESSNA 172M OWNER'S MANUAL NOTES THAT A GRADUAL LOSS IN RPM AND EVENTUAL ENGINE ROUGHNESS MAY RESULT FROM THE FORMATION OF CARB ICE, AND PRESCRIBES THE USE OF CARB HEAT TO CLEAR THE ICE.

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

CARBURETOR HEAT..NOT USED..PILOT IN COMMAND




Contributing Factors

WEATHER CONDITION..CARBURETOR ICING CONDITIONS

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