What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: during a routine IFR flight at 19,000 feet the captain's pitch trim sonalert intermittent tone with no trim input. Pitch trim began to move without any input. Captain's system was selected at that time. Trim was selected off but continued to move. Trim was selected to first officer's side, trim continued to move. Left essential bus switched off and trim stopped. Trim selected to t.o.'s side and system operation was normal. Aircraft landed without further problem. The wire replaced. The captain's side trim power wire found shorted directly to the l/h essential bus, wire replaced. The jumper wire at the captain's yoke trim (ground side) switch found shorted to the yoke, wire replaced. System ops checked good. Aircraft returned to service at Spokane, WA. Horizon air
As the FAA filed it
NARRATIVE: DURING A ROUTINE IFR FLIGHT AT 19,000 FEET THE CAPTAIN'S PITCH TRIM SONALERT INTERMITTENT TONE WITH NO TRIM INPUT. PITCH TRIM BEGAN TO MOVE WITHOUT ANY INPUT. CAPTAIN'S SYSTEM WAS SELECTED AT THAT TIME. TRIM WAS SELECTED OFF BUT CONTINUED TO MOVE. TRIM WAS SELECTED TO FIRST OFFICER'S SIDE, TRIM CONTINUED TO MOVE. LEFT ESSENTIAL BUS SWITCHED OFF AND TRIM STOPPED. TRIM SELECTED TO T.O.'S SIDE AND SYSTEM OPERATION WAS NORMAL. AIRCRAFT LANDED WITHOUT FURTHER PROBLEM. THE WIRE REPLACED. THE CAPTAIN'S SIDE TRIM POWER WIRE FOUND SHORTED DIRECTLY TO THE L/H ESSENTIAL BUS, WIRE REPLACED. THE JUMPER WIRE AT THE CAPTAIN'S YOKE TRIM (GROUND SIDE) SWITCH FOUND SHORTED TO THE YOKE, WIRE REPLACED. SYSTEM OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE AT SPOKANE, WA. HORIZON AIR
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 N2727B · 2
Matched to the same aircraft by N-number and date.