Mr Swift said beam clamps
would not stop the gantry if there was a wind speed of 24mph, and added there were gusts that day of more than 30mph.
In a statement read out to the jury, Health and Safety Inspector Peter Swift said ``beam clamps
'', designed for lifting, were used as brakes for the gantry but beam clamps
would not stop the gantry if there was a wind speed of 24mph, and there were gusts of more than 30mph on the day of the tragedy.
On the other end beam clamps were provided to act as brakes against the wind, although these were designed as brakes against vertical, rather than horizontal movement, Mr Mott said.
He said, "There was sufficient force to move the beam clamps, to move them off the runway beams, and the platform then swung vertically.