Two helicopters ferrying North Sea oil workers had to return to shore for tests after warning lights came on in separate incidents.
The aircraft, operated by Bond and CHC Scotia, are the same model as the Eurocopter AS332L2 Super Puma that crashed in the North Sea in 2009 killing all 16 people on board.
The Bond helicopter was carrying 16 passengers from the Borgholm Dolphin platform and two crew on Wednesday when an oil pressure light came on.
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