- Date
- June 21, 1992, 19:30 local (Jun 22, 1992, 02:30 UTC)
- Place
- Portland, OR
- Injuries
- 53 uninjured
- Damage
- No damage
- Phase of flight
- Enroute
- Aircraft
- CGTAHFokker F.28 MK 1000
- Weather
- Visual (VMC) · Day
- Status
- Completed · report June 30, 1993
- Report
- Approved by Office Director
- Case key
- 41594
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the incident.
On this page
Probable cause
The NTSB’s determination of the probable cause, and any contributing factors.
The partial failure of the horizontal stabilizer trim drive system, the restricted movement of the stabilizer, and the overtorque of a system component.
Analysis
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.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Aircraft
- Registration
- CGTAH
- Reported as
- Fokker F.28 MK 1000 (F.28 MK 10)
- Category
- Airplane
- Serial number
- 11082
- Airframe hours
- 18,527
- Engine
- Rolls-Royce R.B.183-2, 9,900 lbs thrust, turbo fan
- Damage
- No damage
- Flight
- Part 129
- Operator
- Timeair Inc.
- Registered owner
- Timeair Inc.
- Airworthiness certificate
- Standard, Transport
- Last inspection
- Unknown · June 19, 1992 · 33 hours before
- Departed
- YVR · Vancouver Bc
- Destination
- LAS · Las Vegas, NV
- Flight plan
- IFR
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 36
- Certificates
- Airline transport, Foreign
- Airplane ratings
- Multi-engine land, Single-engine land, Multi-engine sea, Single-engine sea
- Instrument ratings
- Airplane
- Medical
- Class 1, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 9,000 total
Weather
- Conditions
- Visual (VMC) · Day
- Lowest ceiling
- None