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A software problem last week triggered a computer crash at one of the world's busiest airports, London's Heathrow, causing delays and diversions during a peak period. The main computer at London's Air Traffic Control Centre broke down for more than three hours at 4.51am on Thursday at a peak period for long-haul arrivals, a Civil Aviation Authority spokesman said. He insisted there was no danger but said four flights had been diverted to other European cities. The aviation authority spokesman said while the computer was out of commission, air traffic controllers had switched to a manual system and aircraft were ordered to keep a greater separation as a safety precaution. NEC Information Systems Aust.