Fokker F.28 MK 4000 N477AU

Summary

On 1 April 1999 at about 03:43 local time, a Fokker F.28 MK 4000 registered N477AU, operated by Horizon Air, was involved in an incident near Spokane, Washington, United States. 44 people were on board and nobody was injured. No probable cause statement is available for this record.

Date

1 April 1999 at 03:43

Classification

Incident

Location

Spokane, Washington, United States

Coordinates

47.6505, -117.3092

Aircraft

Fokker F.28 MK 4000

Registration

N477AU

Category

Airplane

Engines

2

Operator

Horizon Air

Operating rule

Part 121: Air Carrier

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Billings → Seattle

Aircraft damage

Not recorded

Weather

VMC

Light

Night/Dark

NTSB number

SEA99IA045

Nobody was injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

The flight crew reported that, while in cruise flight, the number 1 hydraulic (utility) fluid quantity dropped below the low red mark on the gauge. The flight crew switched to the secondary hydraulic system and diverted to a nearby airport, where a landing was made without incident. Maintenance personnel inspected the aircraft and found a hydraulic line to the flap drive motor was chafed through and leaking. The flight crew reported that this was the second time that day that the number 1 hydraulic system fluid level had dropped. Prior to the last departure, maintenance personnel had serviced the system with hydraulic fluid. On that occasion, the flight crew ran the engines and cycled the flight controls while maintenance personnel looked for leaks. No leaks were found and the aircraft departed on the next leg of the scheduled flight.

Quoted verbatim from the NTSB record.