United Airlines is investigating whether lightning struck a jet heading into Lihue Airport on Kauai Sunday.
United spokesman Charles Hobart said something happened to Flight 371 around 7 p.m. Sunday as it approached Kauai from San Francisco.
The pilots said it could have been a lightning strike.
The Boeing 757 with 160 people on board landed safely.
Hobart said the plane was taken out of service and flown to a maintenance facility in San Francisco.
Passengers who were scheduled to fly out of Kauai on the same plane were rebooked on other flights.