What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On vectors for kbfi ILS 13R at 2200', PIC noted both tie bus gen breakers out. Reset breakers with no issues. Just before final vector to join localizer, all lights, post lights, engine instruments and backlit gauges went dark and failed. Avionics (G500, GNS530, garmin transponders, GMX200, audio pnl and autopilot) still functioned. PIC followed procedures and elected to land the aircraft instead of risking more failures with going around to troubleshoot the problem(s). PIC was unable to note gear/flap positions due to lighting/instrument failures. Acft landed gear up/flaps up. After acft recovery, an 80 amp tie buss breaker was out. Reseting breaker rendered all systems normal including gear operation. Reason for breaker(s) popping during this incident is unknown at this time. NTSB has upgraded this incident to an accident due to the damage to the wing. Aircraft recieved minor damage to lower fuselage, radar radome and engine inlet scoop due to gear up landing. During the landing, the left wing was damaged approximately 5 feet out from the fuselage, and is not repairable.1
As the FAA filed it
ON VECTORS FOR KBFI ILS 13R AT 2200', PIC NOTED BOTH TIE BUS GEN BREAKERS OUT. RESET BREAKERS WITH NO ISSUES. JUST BEFORE FINAL VECTOR TO JOIN LOCALIZER, ALL LIGHTS, POST LIGHTS, ENGINE INSTRUMENTS AND BACKLIT GAUGES WENT DARK AND FAILED. AVIONICS (G500, GNS530, GARMIN TRANSPONDERS, GMX200, AUDIO PNL AND AUTOPILOT) STILL FUNCTIONED. PIC FOLLOWED PROCEDURES AND ELECTED TO LAND THE AIRCRAFT INSTEAD OF RISKING MORE FAILURES WITH GOING AROUND TO TROUBLESHOOT THE PROBLEM(S). PIC WAS UNABLE TO NOTE GEAR/FLAP POSITIONS DUE TO LIGHTING/INSTRUMENT FAILURES. ACFT LANDED GEAR UP/FLAPS UP. AFTER ACFT RECOVERY, AN 80 AMP TIE BUSS BREAKER WAS OUT. RESETING BREAKER RENDERED ALL SYSTEMS NORMAL INCLUDING GEAR OPERATION. REASON FOR BREAKER(S) POPPING DURING THIS INCIDENT IS UNKNOWN AT THIS TIME. NTSB HAS UPGRADED THIS INCIDENT TO AN ACCIDENT DUE TO THE DAMAGE TO THE WING. AIRCRAFT RECIEVED MINOR DAMAGE TO LOWER FUSELAGE, RADAR RADOME AND ENGINE INLET SCOOP DUE TO GEAR UP LANDING. DURING THE LANDING, THE LEFT WING WAS DAMAGED APPROXIMATELY 5 FEET OUT FROM THE FUSELAGE, AND IS NOT REPAIRABLE.1
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.