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20040904023419A

Accident · Destroyed
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FAA accident report · Frchld M-62A-3 · Corsicana, TX · September 4, 2004

FAA Aviation Safety Information Portal

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Date
September 4, 2004
Place
Corsicana, TX
Airport
Corsicana Municipal Airport
Phase of flight
To Init Climb(1st Pwr Reduct)
Operating rules
General operating rules (Part 91)
Damage
Destroyed
Aircraft
N79307
NTSB investigation
NTSBFTW04FA232
Reported as
Frchld M62A3
People aboard
2
Fatal injuries
2
Pilot’s flight hours
8,000 total
N79307Registered now · Fairchild M-62A-3S/N FZ-337 · Built 1943Airframe modelFairchild M-62A-3Engine modelFairchild 6-440 seriesReciprocating

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

(-23) Witness stated that aircraft appeared to have had mechanical problems on the way to run up area. Returned to hangar for maintenance, and departed shortly afterward. Other witness stated that she saw the aircraft in level flight, then witnesses it in dive toward the ground. (-23 amendment) post accident investigation revealed: the lower piece of the two piece venturi was found to be dislodged and cocked over to one side resulting in inconsistent fuel vaporization, and allowing raw fuel to travel to the cylinders. It appears the lower piece had been loose and moving for an extended period of time as indicated by the fractured ends of the legs being carboned over. Inspection of the spark plugs revealed a fouling condition and an excessively rich mixture. The mating gasket between the upper and lower body of the carburetor was displayed in two locations and sucked inward allowing air to enter the carburetor at the mating surfaces. Excessive sooting and blackening of the carburetor throat and discharge was noted upon disassembly.

As the FAA filed it

(-23) WITNESS STATED THAT AIRCRAFT APPEARED TO HAVE HAD MECHANICAL PROBLEMS ON THE WAY TO RUN UP AREA. RETURNED TO HANGAR FOR MAINTENANCE, AND DEPARTED SHORTLY AFTERWARD. OTHER WITNESS STATED THAT SHE SAW THE AIRCRAFT IN LEVEL FLIGHT, THEN WITNESSES IT IN DIVE TOWARD THE GROUND. (-23 AMENDMENT) POST ACCIDENT INVESTIGATION REVEALED: THE LOWER PIECE OF THE TWO PIECE VENTURI WAS FOUND TO BE DISLODGED AND COCKED OVER TO ONE SIDE RESULTING IN INCONSISTENT FUEL VAPORIZATION, AND ALLOWING RAW FUEL TO TRAVEL TO THE CYLINDERS. IT APPEARS THE LOWER PIECE HAD BEEN LOOSE AND MOVING FOR AN EXTENDED PERIOD OF TIME AS INDICATED BY THE FRACTURED ENDS OF THE LEGS BEING CARBONED OVER. INSPECTION OF THE SPARK PLUGS REVEALED A FOULING CONDITION AND AN EXCESSIVELY RICH MIXTURE. THE MATING GASKET BETWEEN THE UPPER AND LOWER BODY OF THE CARBURETOR WAS DISPLAYED IN TWO LOCATIONS AND SUCKED INWARD ALLOWING AIR TO ENTER THE CARBURETOR AT THE MATING SURFACES. EXCESSIVE SOOTING AND BLACKENING OF THE CARBURETOR THROAT AND DISCHARGE WAS NOTED UPON DISASSEMBLY.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.

NTSB FTW04FA232Accident · 2 fatalField investigationFinal reportCorsicana, TXThe loss of engine power due to a faulty carburetor and the pilot's failure to maintain airspeed sufficient for flight resulting in an inadvertent stall/spin during the forced landing after takeoff.Sep 4, 2004 · Substantial damage