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The Evening Express in Aberdeen reported that the leak was discovered when workers had lined up to board the Airbus EC225 helicopter.
The rig is reported to have become overcrowded due to the set-back.
"We can confirm one of our Airbus EC225 helicopters had cause to shut down on an offshore installation on Thursday around 1pm following a suspected fluid leak," Bristow Helicopters reportedly told the Evening Express
"The aircraft underwent a full inspection and was subsequently declared serviceable on July 11.
"Flight safety is Bristow's first priority and we will always investigate prior to further flight."
