ASN Wikibase Occurrence # 359005
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| Date: | Wednesday 17 May 1995 |
| Time: | 06:30 LT |
| Type: |  Fairchild SA227-AC Metro III |
| Owner/operator: | Horizon Air |
| Registration: | N2727B |
| MSN: | AC-730 |
| Year of manufacture: | 1989 |
| Total airframe hrs: | 15127 hours |
| Engine model: | GARRETT TPE-331 |
| Fatalities: | Fatalities: 0 / Occupants: 17 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Spokane, WA -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Portland, OR (KPDX) |
| (KGEG) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE IN CRUISE FLIGHT, THE FLIGHT CREW REPORTED THAT THERE WAS AN INTERMITTENT SONALERT FOR THE TRIM IN MOTION, HOWEVER, NEITHER THE TRIM INDICATOR NOR THE AIRCRAFT TRIM WERE AFFECTED AT THIS TIME. SOME MINUTES LATER, THE ELEVATOR TRIM BEGAN TO MOVE WITHOUT CREW INPUT. BOTH THE CAPTAIN AND THE CO-PILOT TRIED TO DEACTIVATE THE TRIM FROM THEIR CONTROL YOKE SWITCHES; HOWEVER, THE TRIM WOULD NOT DEACTIVATE UNTIL THE LEFT SIDE ESSENTIAL BUS WAS SELECTED OFF. THE AIRPLANE THEN LANDED WITHOUT FURTHER INCIDENT. INSPECTION OF THE SYSTEM REVEALED THAT THE CAPTAIN'S SIDE TRIM POWER WIRE WAS SHORTED DIRECTLY TO THE LEFT SIDE ESSENTIAL BUS, AND THE JUMPER WIRE AT THE CAPTAIN'S YOKE TRIM (GROUND SIDE) SWITCH WAS SHORTED TO THE YOKE. AFTER THE WIRES WERE REPLACED, THE SYSTEMS OPERATION CHECKED OK.
Probable Cause: A SHORTED ELECTRICAL WIRING ON THE ELEVATOR TRIM SYSTEM.
Accident investigation:
 |
|
Sources:
NTSB SEA95IA102
History of this aircraft
Other occurrences involving this aircraft
| 11 January 1997 | EC-GKK | Ibertrans Aérea | 0 | Djerba-Zarzis Airport (DJE) |  |
w/o |
| Runway excursion | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 20:35 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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