What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
After departing st mary's climbing through FL 220 about 20 min after takeoff, experienced a loud noise and rapid depressurization. Pilot and crew followed company qrh, decended to FL 130 and continued to destination ted Stevens international airport. An emergency was declared because unrelated torque oscilation indication prompted them to shut down an engine in flight. Landed aircraft without further incident or injury. Inspection revealed a 14.5" crack in the fs 93 radome pressure bulkhead. privacy data omitted Approved ero and repairs were complied with before FAA could assign an iic. Investigation revealed that the same exact incident occurred in 2016. The result was no AD, but privacy data omitted did publish an alert service bulletin to inspect the fs 93 radome pressure bulkhead for fatigue/cracks. The last time the inspection was complied with was July 2024, only 5 months before the depressurization event.
As the FAA filed it
AFTER DEPARTING ST MARY'S CLIMBING THROUGH FL 220 ABOUT 20 MIN AFTER TAKEOFF, EXPERIENCED A LOUD NOISE AND RAPID DEPRESSURIZATION. PILOT AND CREW FOLLOWED COMPANY QRH, DECENDED TO FL 130 AND CONTINUED TO DESTINATION TED STEVENS INTERNATIONAL AIRPORT. AN EMERGENCY WAS DECLARED BECAUSE UNRELATED TORQUE OSCILATION INDICATION PROMPTED THEM TO SHUT DOWN AN ENGINE IN FLIGHT. LANDED AIRCRAFT WITHOUT FURTHER INCIDENT OR INJURY. INSPECTION REVEALED A 14.5" CRACK IN THE FS 93 RADOME PRESSURE BULKHEAD. ^PRIVACY DATA OMITTED^ APPROVED ERO AND REPAIRS WERE COMPLIED WITH BEFORE FAA COULD ASSIGN AN IIC. INVESTIGATION REVEALED THAT THE SAME EXACT INCIDENT OCCURRED IN 2016. THE RESULT WAS NO AD, BUT ^PRIVACY DATA OMITTED^ DID PUBLISH AN ALERT SERVICE BULLETIN TO INSPECT THE FS 93 RADOME PRESSURE BULKHEAD FOR FATIGUE/CRACKS. THE LAST TIME THE INSPECTION WAS COMPLIED WITH WAS JULY 2024, ONLY 5 MONTHS BEFORE THE DEPRESSURIZATION EVENT.
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 N403LC · 1
Matched to the same aircraft by N-number and date.