ASN Wikibase Occurrence # 363428
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| Date: | Sunday 21 June 1992 |
| Time: | 20:30 LT |
| Type: |  Fokker F-28 Fellowship 1000 |
| Owner/operator: | Timeair Inc. |
| Registration: | C-GTAH |
| MSN: | 11082 |
| Total airframe hrs: | 18527 hours |
| Engine model: | ROLLS-ROYCE R.B.183-2 |
| Fatalities: | Fatalities: 0 / Occupants: 53 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Portland, OR -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | VANCOUVER BC (KYVR) |
| Las Vegas, NV (KLAS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE CRUISING AT FLIGHT LEVEL 290, THE FOKKER F.28 MK 1000 EXPERIENCED AN UNCOMMANDED CLIMB OF APPROXIMATELY 3000 FEET. FULL FORWARD PRESSURE ON THE CONTROL COLUMN DID NOT ARREST THE CLIMB, AND THE ATTEMPTED USE OF THE ALTERNATE STABILIZER TRIM SWITCH RESULTED IN REPEATED POPPING OF THE CIRCUIT BREAKER. THE PILOT REGAINED PITCH CONTROL OF THE AIRCRAFT BY MOVING PASSENGERS FORWARD IN THE CABIN, AND BY ENLISTING THE PHYSICAL ASSISTANCE OF ONE FLIGHT ATTENDANT. BY ADJUSTING FLAP AND POWER SETTINGS A SUCCESSFUL LANDING WAS ULTIMATELY ACCOMPLISHED. THE INVESTIGATION REVEALED THAT THE ROD END BEARING ON THE STABILIZER SERVO SPOOL VALVE HAD BEEN OVERTORQUED, CAUSING THE FAILURE OF THE SPOOL, RESULTING IN A SLOW NOSE UP STABILIZER RUNAWAY.
Probable Cause: THE PARTIAL FAILURE OF THE HORIZONTAL STABILIZER TRIM DRIVE SYSTEM, THE RESTRICTED MOVEMENT OF THE STABILIZER, AND THE OVERTORQUE OF A SYSTEM COMPONENT.
Accident investigation:
 |
|
Sources:
NTSB SEA92IA136
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Mar-2024 17:10 | ASN Update Bot | Added |
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