Belfast International Airport: Preparing for emergencies
The runway at Belfast International Airport is one of several in the UK which holds the status "Cat III B" from the Civil Aviation Authority.
For aircraft needing an emergency landing, Aldergrove, County Antrim, is the main one on the island of Ireland and the most westerly in the UK.
BBC News NI reporter Will Leitch joined the airport's engineering supervisor, Norman Lindsay, to find out what it takes to keep the runway available for all eventualities.
28 Apr 2015