On January 8, 1992, a British Aerospace BAE-ATP (registration N852AW) operated by Air Wisconsin Airlines was involved in an aviation accident near Fort Wayne, IN. Investigators recorded the probable cause as: FAILURE OF COMPANY MAINTENANCE PERSONNEL TO MAINTAIN THE AIRPLANE IN ACCORDANCE WITH EXISTING SERVICE BULLETINS. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 2 related events involving the same aircraft type or operator are linked below.
During descent from 11,000 feet, static discharges on both windshields caused loss of EFIS displays. Flight continued on primary displays. A right engine fire warning occurred. The aircraft landed safely. Post-flight inspection found 24 defective static wicks and bonding issues; fire warning failure due to contaminated connector.
Incident
During a descent from 11,000 feet, multiple static discharges occurred on both the captain's and first officer's windshields. Immediately following the discharges, the electronic flight instrument system (EFIS) displays on both sides were lost. The flight crew continued the flight to the destination using the primary flight displays. While enroute, a right engine fire warning indication was received. The aircraft landed without further incident.
Findings
A subsequent examination of the aircraft revealed that 24 static discharge wicks were defective. Several static wicks were found to be not bonded to the airframe. Additional similar bonding problems were identified elsewhere on the aircraft. The failure of the engine fire warning system was traced to a contaminated electrical connector.
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