Fokker F.28 MK 1000 CGTAH

Summary

On 22 June 1992 at about 02:30 local time, a Fokker F.28 MK 1000 registered CGTAH, operated by Timeair Inc., was involved in an incident near Portland, Oregon, United States. 53 people were on board and nobody was injured. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

22 June 1992 at 02:30

Classification

Incident

Location

Portland, Oregon, United States

Coordinates

45.5499, -122.5590

Aircraft

Fokker F.28 MK 1000

Registration

CGTAH

Category

Airplane

Engines

2

Operator

Timeair Inc.

Operating rule

Part 129: Foreign

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Vancouver Bc → Las Vegas

Aircraft damage

Not recorded

Weather

VMC

Light

Day

NTSB number

SEA92IA136

Nobody was injured.

THE PARTIAL FAILURE OF THE HORIZONTAL STABILIZER TRIM DRIVE SYSTEM, THE RESTRICTED MOVEMENT OF THE STABILIZER, AND THE OVERTORQUE OF A SYSTEM COMPONENT.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

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.

Quoted verbatim from the NTSB record.