On September 6, 1987, a Champion 7GCBC (registration N8CK) operated by Mark D. Hartman was involved in an aviation accident near Talkeetna, AK. Investigators recorded the probable cause as: The pilot's failure to maintain adequate airspeed during takeoff after striking a rock with the main landing gear, while operating from an unimproved site with reduced visibility due to window condensation. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot attempted takeoff from an unimproved site with fogged windows, struck a rock with the main gear, and crashed due to insufficient airspeed.
What happened
The pilot initiated a takeoff attempt from an unimproved landing site. Conditions at the location were compromised by condensation that partially obscured the inside of the airplane's windows, reducing forward visibility during the critical ground roll phase.
During the takeoff roll, the main landing gear struck a rock embedded in the surface. This impact caused the aircraft to become prematurely airborne before achieving adequate airspeed. Unable to gain sufficient flying speed to sustain controlled flight, the airplane crashed shortly after becoming airborne.
The investigation
The investigation focused on the circumstances surrounding the takeoff and the immediate mechanical effects of the ground contact. Examination confirmed that the main gear struck a rock during the rollout phase. The condition of the windows was noted as a contributing factor to situational awareness.
Probable cause
The pilot's failure to maintain adequate airspeed during takeoff after striking a rock with the main landing gear, while operating from an unimproved site with reduced visibility due to window condensation.