People living under Heathrow Airport's flight path have been sent leaflets about changes to rules that allow the use of both runways simultaneously.
The runways are restricted to take-off or landing and switch each afternoon, except in an emergency, to give residents respite from the noise.
As part of a trial starting next month the threshold for triggering the emergency system will be lowered.
Airport operator BAA said it would allow it to minimise disruption.
A BAA spokesperson said leaflets had been sent to 150,000 homes that would be affected by the trials.
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The runways are restricted to take-off or landing and switch each afternoon, except in an emergency, to give residents respite from the noise.
As part of a trial starting next month the threshold for triggering the emergency system will be lowered.
Airport operator BAA said it would allow it to minimise disruption.
A BAA spokesperson said leaflets had been sent to 150,000 homes that would be affected by the trials.
more........................
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