What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) During deicing at dfw type I deicing fluid and possibly ice runoff was ingested into the APU inlet. The substance ingested caused the APU to overspeed and result in the turbine wheel breaking apart and liberating from the APU. Fragments penetrated the aft pressure bulkhead in three locations with one large piece coming to rest in a first aid kit stored beneath the aft flight attendants jump seat.
As the FAA filed it
(-23) DURING DEICING AT DFW TYPE I DEICING FLUID AND POSSIBLY ICE RUNOFF WAS INGESTED INTO THE APU INLET. THE SUBSTANCE INGESTED CAUSED THE APU TO OVERSPEED AND RESULT IN THE TURBINE WHEEL BREAKING APART AND LIBERATING FROM THE APU. FRAGMENTS PENETRATED THE AFT PRESSURE BULKHEAD IN THREE LOCATIONS WITH ONE LARGE PIECE COMING TO REST IN A FIRST AID KIT STORED BENEATH THE AFT FLIGHT ATTENDANTS JUMP SEAT.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.
Other reports on N1425A · 2
Matched to the same aircraft by N-number and date.