The National Transportation Safety Board has released preliminary reports about two landing problems that took place at Teterboro Airport in March and April.

The first incident took place March 8 about 10 p.m., when a British Aerospace BAE 125-700A sustained damage while landing on the runway.

The second accident occurred 5:17 p.m. April 2, when a Canadair CL-600-2A12 was substantially damaged during landing. No one was injured in either incident.

 In the March 8 incident, the pilot said the plane was landing normally until afterhe touched down. Then he either caught a tailwind or hit ice on the runway and the plane did not slow down, exiting the runway at 30 knots - nearly 35 mph - the NTSB reported.

The airplane came to rest about 230 feet beyond the departure end of Runway 1 with minor damage to its landing gear. The pilot later reported that another plane, a Gulfstream G-III, had performed a go-around and aborted the landing.

The April incident occurred as the pilot ran into wind shear as he was attempting to land on Runway 19. The plane touched down hard, bounced and touched down again on the nose wheel. Examination of the airplane revealed damage to the right wingtip, right outboard flap jackscrew cover and the pressure bulkhead in the vicinity of the nose gear box, the NTSB reported.

There have been five accidents at Teterboro since December, including the March 8 and April 2 incidents. The others:

ŸOn Dec. 1, a Gulfstream IV skidded off the end of Runway 24 and into the woods. There were nine aboard and none were injured.

The incidents have increased calls for limiting the number of flights at Teterboro,something the Port Authority said it favors.

  In May, the Federal Aviation Administration announced it was going to spend $20 million to erect barriers to prevent planes from skidding off the runway and into populated areas.

J.ŸP. Tristani, a retired Eastern Airlines pilot who lives in Ramsey, said the March 8 and April 2 incidents were not unusual.

"Incidents of aircraft running off the runway are quite prevalent," he said.

Tristani said the reports are not just to learn what happened in a particular accident, but also to prevent a similar one from occurring in the future.

"It's not just a safety measure; it's a learning curve," he said.