Emergency helicopters suspended following fault
12 December 2013 Last updated at 22:47 GMT
Flights of EC 135 helicopters - the same model that crashed into a pub in Glasgow last month - were suspended briefly after a fault was found on an aircraft operated for North West Air Ambulance.
Bond Air Services, which operated the aircraft, grounded the model after a faulty fuel gauge had been discovered.
The company has said the grounding was not related to the Glasgow crash, and the aircraft were later allowed to return to the air after checks were carried out.
Judith Moritz reports.