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NTSB Report
February 25, 1989 · Cessna 172B · N7662X
Unionville, IA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
February 25, 1989
Injury Outcomes
No injuries (3 uninjured)
Location
Unionville, IA
Aircraft
Cessna 172B
Tail Number
N7662X
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MKC89LA064
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.
NTSB 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.
Full Narrative
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.
Flight
Event TypeAccident
Event Time14:45 CST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 172B
Tail NumberN7662X
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · O-300-D · Reciprocating · 145
Seats4
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 41 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind120° @ 7 kt
Visibility12 sm
CeilingBroken clouds 25000 ft
Temperature / Dew Point43 C / 30 C
Altimeter29.00 inHg
Observation Time20:50
Weather SourceWFAC