Electrical interference and engine fire warning during descent

Casualties unknown • Fort Wayne, IN, US

Multiple static discharges on the windshields led to the loss of EFIS displays and a right engine fire warning during an aircraft descent.

What happened

During a descent from 11,000 feet, multiple static discharges occurred on both the captain's and first officer's windshields. This event was followed by the loss of both the captain's and first officer's EFIS displays. The crew continued the flight to the destination using primary flight displays.

While enroute, a right engine fire warning indication was received. The aircraft landed at the destination without further incident; all occupants were not injured.

The investigation

A subsequent examination of the aircraft revealed that 24 static discharge wicks were defective. Investigators found that several static wicks were not bonded to the airframe, and other similar bonding problems were identified on the airplane. Additionally, the failure of the engine fire warning system was traced to a contaminated electrical connector.

Probable cause

The failure of multiple static discharge wicks to properly bond to the airframe and a contaminated electrical connector in the engine fire warning system.

Frequently asked questions

What happened in the 1992-01-08 British Aerospace BAE-ATP accident near Fort Wayne, IN?

Multiple static discharges on the windshields led to the loss of EFIS displays and a right engine fire warning during an aircraft descent.

What aircraft was involved and where did it happen?

The accident on 1992-01-08 involved a British Aerospace BAE-ATP, registration N852AW, operated by Air Wisconsin Airlines, at Fort Wayne, IN.

What was the probable cause of the accident?