ASN Wikibase Occurrence # 354448
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| Date: | Monday 18 May 1998 |
| Time: | 03:15 LT |
| Type: |  Boeing 747-123 |
| Owner/operator: | United Parcel Service |
| Registration: | N675UP |
| MSN: | 20390/136 |
| Year of manufacture: | 1971 |
| Total airframe hrs: | 58165 hours |
| Engine model: | P&W JT9D-7AH |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Minneapolis, MN -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Louisville, KY (KLOU) |
| Anchorage, AK (ANC | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Probable Cause: the open shielding on the #2 VHF transceiver coax connector which resulted in electromagnetic interference with the yaw damper system.
Accident investigation:
 |
|
Sources:
NTSB CHI98IA164
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Mar-2024 14:32 | ASN Update Bot | Added |
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