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NTSB Identification: FTW98LA091. The docket is stored in the (offline) NTSB Imaging System.

Accident occurred Friday, January 09, 1998 at BOYD, TX

Aircraft: Cessna 152, registration: N757CH

Injuries: 2 Minor



Event: 20001211X09428 Status: Final Report Approved On Tuesday, December 08, 1998



NTSB Preliminary Narrative (6120.19A)



On January 9, 1998, at 1245 central standard time, a Cessna 152, N757CH, impacted terrain during a forced landing following a loss of engine

power near Boyd, Texas. The airplane was operated by Bourn Ammenson Aviation, Inc., Fort Worth, Texas, under Title 14 CFR Part 91. The

private pilot/instrument student and the commercial pilot/flight instructor received minor injuries, and the airplane sustained substantial damage.

Visual meteorological conditions prevailed and a flight plan was not filed for the local instructional flight that departed Hicks Airfield at 1230.



During personal interviews, conducted by the investigator-in-charge, and on the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2),

the flight instructor and instrument student reported that the student was practicing standard rate (500 fpm) descents and climbs. The flight

descended with the power at 2,000 RPM from 3,000 feet MSL to 1,500 feet MSL, and the instrument student applied full throttle for the climb;

however, the engine power did not increase. The flight instructor took the flight controls and applied carburetor heat and performed the

emergency checklist; however, the power decreased through 1,500 RPM to 1,200 RPM. At a descent rate of 200 fpm, the flight instructor

selected a field which "appeared to be suitable for the landing." However, the field was rough and the airplane struck the ground and again

became airborne. The flight instructor, observing a powerline and fence ahead of the airplane, flew the airplane under the powerline and over

the fence. Subsequently, the airplane "stalled" as it approached a hill. The left wing and the nose gear struck the ground, and the airplane came

to rest inverted. The left wing, vertical stabilizer, and rudder sustained damage.



The flight instructor reported the temperature at 55 degrees Fahrenheit with a dew point of 40 degrees Fahrenheit. The National Weather

Service (METAR) observation at 1253 for the Alliance Airport (14 miles east of the accident site) reported the temperature at 46.4 degrees

Fahrenheit with a dew point of 39.2 degrees Fahrenheit and a relative humidity of 61 per cent. The icing probability curves showed the

conditions to be favorable for serious carburetor icing.



NTSB Final Narrative (6120.4)



The instrument student was practicing standard rate (500 fpm) descents and climbs, and the flight had descended with the power at 2,000 RPM

from 3,000 feet MSL to 1,500 feet MSL. When the student applied full throttle for the climb, the engine power did not increase. The flight

instructor took the flight controls and applied carburetor heat; however, the power decreased through 1,500 RPM to 1,200 RPM. The field

selected for the forced landing was rough and the airplane struck the ground and again became airborne. The flight instructor, observing a

powerline and fence ahead of the airplane, flew the airplane under the powerline and over the fence. Subsequently, the airplane 'stalled' and

impacted the ground. The NWS reported the temperature was 46.4 degrees Fahrenheit with a dew point of 39.2 degrees Fahrenheit and a

relative humidity of 61 per cent. The icing probability curves showed the conditions to be favorable for serious carburetor icing.



NTSB Probable Cause Narrative



loss of engine power resulting from the pilot's delayed use of carburetor heat during serious carburetor icing conditions. Factors were: the lack

of suitable terrain for the forced landing and an evasive maneuver which led to an inadvertent stall.



Occurrences and Sequence of Events

Occurrence: 1, LOSS OF ENGINE POWER

Phase of Operation: DESCENT - NORMAL



Sequence of Events for Occurrence Number: 1

1 ( Factor ) WEATHER CONDITION / CARBURETOR ICING CONDITIONS / (0)

2 ( Cause ) FUEL SYSTEM, CARBURETOR / ICE / (0)

3 ( Cause ) CARBURETOR HEAT / DELAYED / PILOT IN COMMAND



Occurrence: 2, FORCED LANDING

Phase of Operation: EMERGENCY DESCENT/LANDING



Occurrence: 3, IN FLIGHT COLLISION WITH TERRAIN/WATER

Phase of Operation: LANDING - FLARE/TOUCHDOWN



Sequence of Events for Occurrence Number: 3

1 ( Factor ) TERRAIN CONDITIONS / NONE SUITABLE / (0)

2 (Finding) TERRAIN CONDITIONS / ROUGH/UNEVEN / (0)

3 (Finding) OBJECT / WIRE,TRANSMISSION / (0)

4 (Finding) OBJECT / FENCE / (0)

5 ( Factor ) MANEUVER TO AVOID OBSTRUCTIONS / INTENTIONAL / PILOT IN COMMAND

6 (Finding) STALL / INADVERTENT / PILOT IN COMMAND


 

 

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