ASN Wikibase Occurrence # 369161
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| Date: | Saturday 25 February 1989 |
| Time: | 16:45 LT |
| Type: |  Cessna 172B |
| Owner/operator: | Private |
| Registration: | N7662X |
| MSN: | 17248162 |
| Total airframe hrs: | 3050 hours |
| Engine model: | CONTINENTAL O-300-D |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Unionville, IA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Ft. Madison, IA (K27) |
| Osceola, IA (K27) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT SAID THAT WHILE CRUISING TO HIS DESTINATION APT, THE ENGINE QUIT SUDDENLY. EMERGENCY PROCEDURES FAILED TO RECTIFY THE POWER LOSS AND AN EMERGENCY LANDING WAS ATTEMPTED ON A SNOW COVERED FARM FIELD. A COLLISION WITH A DITCH TORE OFF THE NOSE GEAR AND THE AIRCRAFT CONTINUED TO SLIDE ABOUT 300 FEET, COMING TO STOP ON IT'S NOSE. POST ACCIDENT INVESTIGATION REVEALED THE CARB HEAT BOX TO BE IMPROPERLY RIGGED AND A SEAL MISSING FROM THE FLAPPER VALVE. METEOROLOGICAL CONDITIONS AT THE TIME WERE CONDUCIVE FOR CARB ICING ACCORDING TO ICING PROBABILITY CHARTS. THE MIS-RIGGING OF THE CARB HEAT BOX PREVENTED FULL APPLICATION OF CARB HEAT. AFTER THE ENGINE QUIT THE PILOT ATTEMPTED TO RESTORE POWER WITH CARB HEAT BUT WAS UNABLE.
Probable Cause: THE FAILURE OF THE ENGINE DUE TO CARBURETOR ICE. CONTRIBUTING FACTORS INCLUDED CARBURETOR ICING CONDITIONS, IMPROPER USE OF THE CARBURETOR HEAT CONTROL BY THE PILOT, AND THE IMPROPERLY RIGGED CARBURETOR AIR BOX WHICH RESULTED IN REDUCED CARBURETOR HEATING CAPABILITY.
Accident investigation:
 |
|
Sources:
NTSB MKC89LA064
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Mar-2024 11:30 | ASN Update Bot | Added |
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