BOSTON (AP) -- Federal officials continued working Tuesday morning to fix a malfunctioning radar system that has triggered long delays at Logan International Airport.
An airport spokesman said the average delay for incoming flights was more than two hours on Tuesday morning, a full day after the radar surveillance system at Logan first broke down. On Monday, many flights were more than four hours late arriving.
A New Jersey-based Federal Aviation Administration team traveled to Boston on Tuesday to investigate the problem, FAA spokeswoman Arlene Murray said.
''We are looking at everything to try to find out what the problem is,'' she said. ''We're keeping other airports and airlines up to date on the situation.''
In the meantime, flights were being monitored by a long-range backup radar system in Nashua, N.H., Murray said. Relying on that system requires increasing the distance between planes from three miles to five miles, resulting in the delays.
''We basically slowed the system down a little bit until we can correct the problem,'' Murray said.
Starting early Monday morning, air traffic controllers began seeing ''false targets'' on their radar scopes - blips that the controllers knew did not represent planes in flight.
''A flock of geese can cause the problem, but this seems to be recurring,'' Murray said. ''It's not a common problem. We have had it occur at facilities before.''
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Workers borrowed an antenna from an airport in Bangor, Maine, to fix the faulty equipment that caused two days of delays at the Mass. Airport.
Lights began malfunctioning last Thursday evening due to frozen groundwater that disturbed the underground wiring.
As part of a $7.5 million repaving and reconstruction project, Logan officials said, they have to shut down one of the airport's two major runways for 40 hours this weekend.
Several of Logan's recent near-collisions occurred when pilots crossed onto active runways, despite warnings from air traffic controllers and radio reminders.