Probable cause
A loss of engine power due to the improper torquing of the number one cylinder's spark plug as a result of inadequate maintenance.
NTSB analysis
The pilot reported a loss of engine power during cruise flight. He elected to land in the only open space available, which was comprised of rising terrain. During the approach to the field, the left wing dropped and the airplane turned to the left before impact. A postaccident examination of the number one cylinder exhaust port revealed an accumulation of carbon. The number one cylinder’s spark plug could be loosened by hand in indication that it was not properly secured prior to impact; removal of that plug revealed that it exhibited a fouled appearance. The engine's maintenance manual indicated that the spark plugs are to be tightened on a cold engine to 240-inch pounds of torque. The airplane’s airworthiness was maintained by the owner/pilot under a conditional maintenance program.
Text from the NTSB. Open the NTSB docket for CEN10LA498 for the full record.
Event
- Date
- Aug 24, 2010
- Type
- Accident
- Place
- Traverse City, Michigan
- Nearest airport
- Cherry Capital Airport (TVC)
- Highest injury
- Minor
- Minor injuries
- 1
- Weather
- Visual (VMC)
- Light
- Day
Amateur-built SUPER KOALA
- N-number
- N220FF
- Category
- Airplane
- Damage
- Substantial
- Operating rule
- Part 91 (general aviation)
- Purpose of flight
- Personal
Other records under this N-number
From the NTSB aviation accident database: N-registered aircraft, events since 2008, data through Oct 28, 2026. The file is published monthly, so the latest weeks are incomplete and recent records can change. The official source is the NTSB aviation investigation search. CheckAero is independent and not affiliated with the NTSB.