The FAA on Wednesday issued a safety alert for Boeing 737 jets after overhead wires connected to circuit breakers on some airplanes caught fire after they rubbed together.
The FAA said it's a serious event that affects models 737-100 through 737-500.
The wires caught fire on three of the aircraft, one of which was in flight.
Officials said the malfunction occurred because of improperly installed clamps on air ducts.
Operators inspected 279 Boeing 737 series planes, and 71 of those planes had incorrectly installed clamps.