Beechcraft 1900D N75ZV

Summary

On 21 January 1997 at about 14:20 local time, a Beechcraft 1900D registered N75ZV, operated by Mesa Airlines, was involved in an incident near Seattle, Washington, United States. 7 people were on board and nobody was injured. The aircraft was slightly damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

21 January 1997 at 14:20

Classification

Incident

Location

Seattle, Washington, United States

Nearest airport

Seattle-Tacoma Int'l (SEA)

Coordinates

47.4394, -122.2797

Aircraft

Beechcraft 1900D

Registration

N75ZV

Category

Airplane

Engines

2

Operator

Mesa Airlines

Operating rule

Part 135: Air Taxi & Commuter

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Walla Walla → Unknown

Aircraft damage

Minor

Weather

VMC

Light

Night/Dark

NTSB number

SEA97IA051

Nobody was injured.

an axial shift of the aft flap track bearing's outer roller, resulting in erosion and failure of the flap track bracket/bearing assembly. A factor relating to the incident was: inadequate inspection of the flap roller bearing/bracket assemblies.

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

Read the full NTSB narrative

While on final approach, the airplane commenced a rapid, uncommanded roll to the right when the 35-degree flap setting was selected. The flying pilot (1st officer) was able to counter the roll by applying almost full opposite aileron, during which time, he felt the aileron jam momentarily and then break free. The airplane landed without further incident. An examination revealed that the inboard, aft end of the right wing outboard flap was detached from the wing flap track. This resulted in flap asymmetry and mechanical interference with the aileron. The flap track roller bearing was seized and the flap mounting bracket was torn and separated from the bearing. The bearing outer roller was loose and could be shifted axially on the bearing outer ring. This allowed the outer roller flange to wear against and eventually tear through the flap mounting bracket. The operator was not using the most recent (revised) Beech 1900D maintenance manuals at the time of the incident and the airplane had not been subjected to a detailed inspection of the flap roller brackets, roller bearings, and attachment hardware as outlined in revised sections of the manual.

Quoted verbatim from the NTSB record.