What was found
APU AUTO SHUT DOWN WHEN APU ATTEMPTED TO START ENGINE THERE WAS A LOUD BANG, A FIRE BALL CAME OUT OF THE EXHAUST AND THEN SMOKE POURED OUT. REMOVED AND REPLACED APU.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
APU AUTO SHUT DOWN WHEN APU ATTEMPTED TO START ENGINE THERE WAS A LOUD BANG, A FIRE BALL CAME OUT OF THE EXHAUST AND THEN SMOKE POURED OUT. REMOVED AND REPLACED APU.