NTSB

Probable Cause: A loss of engine power during initial climb due to fuel vapor lock. Contributing to the accident was the incorrect installation of the ancillary fuel supply system components.

Probable Cause: The pilot’s adjustment of the carburetor to an incorrect setting, which resulted in partial loss of engine power during takeoff.

Probable Cause: The commercial pilot’s failure to maintain directional control of the airplane during takeoff. Contributing was the student pilot’s application of brakes during the takeoff roll and the failure of both pilots to maintain a positive transfer of controls.

Probable Cause: The inability of the Boeing 75 pilot to anticipate that the Piper would stop earlier on the taxiway which resulted in the on-ground collision.

Probable Cause: The pilot’s excessive turn rate and bank angle while at low airspeed and altitude, resulting in an accelerated aerodynamic stall, loss of airplane control, and collision with terrain.

Probable Cause: The pilot’s inadequate fuel management which resulted in a total loss of engine power due to fuel starvation.

Probable Cause: The pilot’s decision to depart with the airplane over maximum gross weight, which reduced the climb performance and resulted in a collision with a tree.