NTSB Identification: DEN88LA133.
The docket is stored on NTSB microfiche number 37030.
Accident occurred Tuesday, June 21, 1988 in GRAND FORKS, ND
Probable Cause Approval Date: 09/11/1989
Aircraft: CESSNA 152, registration: N96730
Injuries: 2 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.
A CFI AND COMMERCIAL RATED PILOT WERE PRACTICING SIMULATED EMERGENCY LANDINGS WITH POWER RECOVERIES. THE STUDENT SET UP AN APPROACH TO A CULTIVATED FIELD AND WHEN POWER WAS ADDED, THE ENGINE ADVANCED TO 1300 RPM, THEN RETURNED TO IDLE. FURTHER ATTEMPTS TO INCREASE RPM WERE FUTILE. THE CFI TOOK THE CONTROLS, CLOSED THE THROTTLE AND PREPARED FOR THE LANDING. AT TOUCHDOWN THE NOSE WHEEL DUG INTO THE SOFT TERRAIN AND THE AIRPLANE NOSED OVER. A POST-ACCIDENT INSPECTION AND ENGINE RUN BY AN A&P MECHANIC WITH INSPECTION AUTHORIZATION FAILED TO REVEAL ANY EVIDENCE TO EXPLAIN THE REPORTED MALFUNCTION. THE AIRCRAFT WAS OPERATING IN THE CARBURETOR ICING PROBABILITY REGION.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:CARBURETOR HEAT..IMPROPER USE OF..DUAL STUDENT
The National Transportation Safety Board determines the probable cause(s) of this accident to be:SUPERVISION..INADEQUATE..PILOT IN COMMAND(CFI)
WEATHER CONDITION..CARBURETOR ICING CONDITIONS
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