The pilot of a single-engine airplane was uninjured after making a "gear-up" landing yesterday at Long Island MacArthur Airport, officials said.

The landing briefly closed two runways at the Ronkonkoma airport but did not affect commercial operations, Town of Islip spokeswoman Inez Birbiglia said. The FAA said the Beechcraft Bonanza V35B landed at 10:31 a.m. on Runway 33L. The pilot, who was not identified by officials, was alone.

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The FAA is investigating why the landing gear was not deployed, called a "gear up."

It was not clear whether an emergency was declared before landing. Birbiglia said the plane came to rest near the intersection of Runway 33L and Runway 6/24, and the FAA said those runways remained closed until 12:05 p.m.

Birbiglia said Runway 10/28 remained open and commercial operations at the airport, which services Southwest Airlines, US Airways Express, PenAir and Allegiant Air, were not affected. Federal records indicate the plane is registered to Flyined Inc. of Wellington, Florida.

The aircraft's itinerary was not clear, and Birbirglia said only that the flight was bound for MacArthur.