Helicopter explodes at Corona Municipal Airport.

Helicopter explodes at Corona Municipal Airport. (KTLA-TV / November 26, 2012)

CORONA, Calif. (KTLA) -- Investigators have identified the pilot killed in an explosion at the Corona Municipal Airport as James Bechler of Long Beach

It happened around 11 p.m. Sunday near the fuel pumps, said Federal Aviation Administration spokesman Ian Gregor.

Investigators believe the Robinson R-44 helicopter was in motion, though they're not sure if it was moving vertically or horizontally.

It may have been simply taxiing by when it clipped the canopy of the refueling area.

Two witnesses heard the blast and called 911. Paramedics and firefighters arrived quickly, but the chopper was fully engulfed in flames.

Bechler was killed in the explosion.

The explosion sent one piece of one rotor blade flying, and it lodged in the steel structure of one of the airport hangars.

The National Transportation Safety Board and the FAA are investigating.