Boeing 747-123 N675UP

Summary

On 18 May 1998 at about 07:15 local time, a Boeing 747-123 registered N675UP was involved in an incident near Minneapolis, Minnesota, United States. 3 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

18 May 1998 at 07:15

Classification

Incident

Location

Minneapolis, Minnesota, United States

Coordinates

44.8503, -93.2296

Aircraft

Boeing 747-123

Registration

N675UP

Category

Airplane

Engines

4

Operator

Not recorded

Operating rule

Part 121: Air Carrier

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Louisville → Anchorage

Aircraft damage

Not recorded

Weather

Unk

Light

Night/Dark

NTSB number

CHI98IA164

Nobody was injured.

the open shielding on the #2 VHF transceiver coax connector which resulted in electromagnetic interference with the yaw damper system.

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

Read the full NTSB narrative

While troubleshooting a fire warning indication with company maintenance control using the #2 VHF transceiver, the crew experienced several uncommanded 'kicks' of the yaw damper. The crew turned off the upper yaw damper, but not the lower. They continued to experience 'kicks' although not as severe. The flight departed to Minneapolis where it landed uneventfully. Inspection of the airplane after the incident revealed an open shield at the #2 VHF coax connector which is located near the yaw damper control box. The connector was replaced and the airplane was returned to service.

Quoted verbatim from the NTSB record.