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| NTSB Identification: CHI00LA046. The docket is stored in the (offline) NTSB Imaging System. |
| Accident occurred Tuesday, December 14, 1999 at OMAHA, NE |
| Aircraft: Cessna 150B, registration: N7339X |
| Injuries: 2 Uninjured |
| Event: 20001212X20207 Status: Final Report Approved On Monday, December 04, 2000 |
| NTSB Preliminary Narrative (6120.19A) |
| On December 14, 1999, at 0910 central standard time, a Cessna 150B, N7339X, owned and piloted by a certified flight instructor (CFI), |
| sustained substantial damage during a forced landing on a road, following an engine failure during climbout from the North Omaha Airport (3NO), |
| Omaha, Nebraska. Visual meteorological conditions prevailed at the time of the accident. The local instructional flight was conducted under the |
| provisions of 14 CFR Part 91 and was not on a flight plan. The CFI and dual student reported no injuries. The flight was originating at the time of |
| the accident. |
| In a written statement, the CFI stated, "shortly after departure, approximately 700 feet agl, 2,022 feet msl, the aircraft experienced a failed |
| engine." The CFI stated that she executed a forced landing on a road and the aircraft contacted a semi-truck. |
| A postaccident examination of the aircraft by the Federal Aviation Administration (FAA) revealed no preexisting anomalies with respect to the |
| aircraft or aircraft systems. In a written report, the CFI reported no mechanical malfunction. |
| The Eppley Airfield weather reporting station (OMA), Omaha, Nebraska, located 7 miles on a magnetic heading of 124 degrees from the accident |
| site reported, at 0852, clear skies, winds from 090 degrees at 6 knots, an altimeter setting of 29.80 inches of mercury, a temperature of 32 |
| degrees F., and a dewpoint of 28 degrees F. A carburetor icing probability chart developed by Transport Canada depicts regions of temperature |
| and dewpoint that are conducive for the development of carburetor ice. FAA Advisory Circular AC 20-113 "Pilot Precautions and Procedures to |
| be Taken in Preventing Aircraft Reciprocating Engine Induction System and Fuel System Icing Problems" states under Prevention Procedures, |
| "When the relative humidity is above 50 percent and the temperature is below 70 degrees F., apply carburetor heat briefly immediately before |
| takeoff, particularly with float type carburetors, to remove any ice which may have been accumulated during taxi and runup. |
| NTSB Final Narrative (6120.4) |
| The aircraft experienced an engine failure after departure. The certified flight instructor (CFI) executed a forced landing on a road where the |
| aircraft wing contacted a semi-truck. A postaccident examination revealed no preexisting anomalies with respect to the aircraft or aircraft |
| systems. The CFI reported no mechanical malfunction. A weather report stated a temperature of 32 degrees F., and a dewpoint of 28 degrees |
| F. According to the carburetor icing chart by Transport Canada, the temperature and dewpoint at the time of the accident fall within the range of |
| serious icing potential. FAA AC 20-113 states, 'When the relative humidity is above 50 percent and the temperature is below 70 degrees F., |
| apply carburetor heat briefly immediately before takeoff, particularly with float type carburetors, to remove any ice which may have been |
| accumulated during taxi and runup.' |
| NTSB Probable Cause Narrative |
| The pilots failure to use carburetor heat during takeoff in weather conducive for serious carburetor ice. Factors were the weather that was |
| conducive for carburetor icing and the presence of the truck that the aircraft impacted. |
| Occurrences and Sequence of Events |
| Occurrence: 1, LOSS OF ENGINE POWER |
| Phase of Operation: CLIMB |
| Sequence of Events for Occurrence Number: 1 |
| 1 ( Factor ) WEATHER CONDITION / CARBURETOR ICING CONDITIONS / (0) |
| 2 ( Cause ) CARBURETOR HEAT / IMPROPER USE OF / PILOT IN COMMAND (CFI) |
| Occurrence: 2, FORCED LANDING |
| Phase of Operation: EMERGENCY DESCENT/LANDING |
| Occurrence: 3, ON GROUND/WATER COLLISION WITH OBJECT |
| Phase of Operation: LANDING - ROLL |
| Sequence of Events for Occurrence Number: 3 |
| 1 ( Factor ) OBJECT / VEHICLE / (0) |
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