Source:
The GuardianBritish Airways flight 9271E had an unconventional cargo and destination. There were no passengers on the A320 aeroplane, which took off on Tuesday evening and flew north through a swath of UK airspace that contained, according to Met Office forecasts, a high density of volcanic ash.
Crewed by two BA pilots and a pair of observers from the airline's engineering department, the jet flew at various altitudes through a "red-zone" that hung above much of Scotland and had grounded thousands of travellers beneath it. There was no special monitoring equipment onboard, except for two cameras that were brought to record evidence of ash clouds but were in the end not needed.
"We did not have any specialist equipment, hence the observers to put some additional eyeballs onboard with the ability to walk up and down the cabin in case we smelled anything," said Garry Copeland, BA's director of engineering who was on the flight.
Copeland said there was no evidence of volcanic pollution throughout a 45-minute trip that charted a course from Manchester to Newcastle, Glasgow, Edinburgh and London Heathrow, flying through the red zone much of the time.
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http://www.guardian.co.uk/world/2011/may/25/british-airways-test-flight-ash-cloud