as you know the original 'certification'required two'reliable'stopping devices-spoilers/brakes-to be deployed within about 3.5secs(depend on type/configuration-longer to recognise the centre engine failure)..Newer types(320)has auto spoiler extension(depending on occurence speed).
Depending on the 'test card'either 'brakes on/thrust levers close 'was the first 'action'
Cheers
