What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) On climb out from Phoenix Sky Harbor International Airport to minneapolis, Minnesota at flight level 190 there was a loud bang and an airframe shudder. The pressurization was checked and the outflow valve was found to be full closed while the cabin altitude was climbing. The crew initiated an emergency descent, declared an emergency and returned to Phoenix, without further incident. Maintenance personnel found a blown out duct in the right air conditioning bay. The check valve that prevents reverse airflow from the mix manifold also failed. The flapper disk was torn off and found in the ducting. That is why the airplane pressurization could not be maintained. Maintenance personnel removed and replaced the duct assembly, part #213N403 and the check valve, Garrett part #3202142-1.
As the FAA filed it
(-23) ON CLIMB OUT FROM PHOENIX SKY HARBOR INTERNATIONAL AIRPORT TO MINNEAPOLIS, MINNESOTA AT FLIGHT LEVEL 190 THERE WAS A LOUD BANG AND AN AIRFRAME SHUDDER. THE PRESSURIZATION WAS CHECKED AND THE OUTFLOW VALVE WAS FOUND TO BE FULL CLOSED WHILE THE CABIN ALTITUDE WAS CLIMBING. THE CREW INITIATED AN EMERGENCY DESCENT, DECLARED AN EMERGENCY AND RETURNED TO PHOENIX, WITHOUT FURTHER INCIDENT. MAINTENANCE PERSONNEL FOUND A BLOWN OUT DUCT IN THE RIGHT AIR CONDITIONING BAY. THE CHECK VALVE THAT PREVENTS REVERSE AIRFLOW FROM THE MIX MANIFOLD ALSO FAILED. THE FLAPPER DISK WAS TORN OFF AND FOUND IN THE DUCTING. THAT IS WHY THE AIRPLANE PRESSURIZATION COULD NOT BE MAINTAINED. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE DUCT ASSEMBLY, PART #213N403 AND THE CHECK VALVE, GARRETT PART #3202142-1.
Other reports on N904AW · 4
Matched to the same aircraft by N-number and date.