NTSB

The pilot’s failure to maintain directional control of the airplane while landing with a flat main tire.

The pilot’s failure to maintain adequate terrain clearance, resulting in an in-flight collision with an airport sign.

The student pilot’s failure to maintain directional control during the landing roll. Factors included a 90° crosswind, and the student pilot’s improper in-flight decision to land on a runway with the crosswind rather than on an available runway with a headwind.

The pilot’s failure to properly execute the manual landing gear extension procedures. The electrical system failure was a factor.

The student pilot’s failure to maintain directional control during takeoff, which led to the impact with the snow banks.

The loss of engine power due to undetermined reasons. A factor in the accident was the pilot’s failure to follow emergency procedures when he failed to jettison the advertising banner prior to his forced landing in water.

A loss of engine power for undetermined reasons. The inadvertent lift-off that occurred during the high speed taxi checks was a factor.

The pilot’s improper recovery from a bounced landing.