Wichita ? The widow of a test pilot who died in a plane crash almost two years ago is upset that investigators still have not determined what caused the accident.

Carol Fiore has written the National Transportation Safety Board asking why it is taking so long to get information about the crash.

Her husband, Eric Fiore, died from injuries he suffered on Oct. 10, 2000, when the Challenger 604 business jet he was co-piloting on a test flight from Wichita Mid-Continent Airport crashed on take-off.

Pilot Bryan Irelan, 33, and flight engineer David Riggs, 48, died in the crash. Fiore, 43, died 36 days later.

A preliminary report, issued by the NTSB less than two weeks after the accident, said a witness saw the jet tilt sideways, hit the ground and flip.

In a recent letter to the NTSB, Fiore wrote: “My husband gave up his life to make sure the skies are safe. … Why is it that the NTSB will not give my family any information about the accident? Why is the investigation taking so long?”

Paul Schlamm, an NTSB spokesman, said a test flight like the one involved in the Wichita crash is more complicated than a regular flight.

And the Wichita crash is one of about 2,000 crashes the NTSB must investigate each year with a limited staff, Schlamm said. He said the investigation was “drawing to a close.”

“That’s what they’ve been telling me for almost a year,” Fiore responded.