Maintenance personnel’s inadequate inspection of the airplane, which failed to detect and correct chafed electrical wiring and a degraded fuel bladder with holes, which resulted in ignition of fuel vapor and a right wing explosion.

The improper maintenance of the outboard left wing, which allowed electrical arcing and leaking of the fuel sending unit and subsequently resulted in ignition of fuel vapors and an explosion of the outboard left wing.

The pilot’s failure to properly secure the crew hatch door before takeoff, which resulted in his distraction and his failure to maintain airplane control and airspeed.