NTSB Identification: CHI83FA370.
The docket is stored on NTSB microfiche number 26752.
Accident occurred Friday, August 05, 1983 in OSHKOSH, WI
Aircraft: ZENAIR CRICKET MC12, registration: CGAYW
Injuries: 1 Minor.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

DURING A FORMATION TAKEOFF, THE PLT WAS FLYING IN A LEFT WINGMAN POSITION & THE FLT ENTERED A RELATIVELY STEEP CLIMB. THE PLT STATED THAT THE AIRSPEED WAS SLIGHTLY ABOVE THE STALL SPEED AT ABOUT 100 TO 150 FT AGL WHEN THE LEFT ENG LOST POWER & THE ACFT BEGAN TURNING LEFT & LOSING ALT. HE REPORTED THAT THE PLANE STALLED & HE COULD NOT CONTROL THE LEFT YAW & TURN, UNTIL AFTER HE LOWERED THE NOSE & REGAINED AIRSPEED. HE DID NOT REDUCE POWER ON THE OPERATING ENG. SUBSEQUENTLY, THE ACFT STRUCK THE GROUND IN A SLIGHT NOSE DOWN ATTITUDE. AN INVESTIGATON REVEALED THAT THE SINGLE SPARK PLUG IN THE LEFT, SINGLE CYLINDER, 2 STROKE ENG WAS NOT FIRING AT THE ELECTRODE TIP.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

IGNITION SYSTEM,SPARK PLUG..DISABLED

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AIRSPEED(VMC)..NOT MAINTAINED..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

STALL..INADVERTENT..PILOT IN COMMAND

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