TOUCHDOWN A-GO-GO
WHEN IS A LANDING NOT A LANDING?
SECONDS FROM touchdown, you see low-level warehouses, perimeter fencing and plane hangars. But just before the runway appears, you hear the engines roar to full throttle and
find yourself soaring upwards
in a powerful climb. You’ve just experienced a go-around.
There are lots of reasons for this manoeuvre. Also known as ‘missed approaches’, they happen when either the pilots
or air traffic control (ATC) decide
conditions are unsuitable for landing. The plane is then given full thrust to climb to a safe altitude before trying again.
Why does it happen? One reason is weather. If the pilots cannot see the runway at the altitude known as the ‘decision height’, they will go around until a rain squall or fog clears.
Another reason is congested
air traffic. ‘When the distance
between two landing aircraft goes below a certain distance, one aircraft is taken out of
the landing sequence by ATC
to maintain safe separation,’
explains Captain Peter
Hudson. ‘Linked to that, if an aircraft takes too long to clear the runway, we will go around’.
‘A go-around is a standard procedure and we prepare for it as part of our recurring training in the simulator roughly every 90 days, so when it does happen, we know exactly what
to do’, says Captain Hudson.
‘They’re one of the more common uncommon events that happen.’
It is a pre-planned process.
During the cruise, the flight
crew spend time checking that the navigation required for missed approaches is
programmed into the flight
management computers ahead of time, and pilots discuss how they are going to get in – and out – if necessary.
First priority is to get the aircraft moving. ‘We will generally use maximum thrust, and because the aircraft is fuellight at the end of a journey, it gathers speed and height very
quickly,’ says Captain Hudson.
‘Then we make sure we are navigating the right way and
flying to the right altitude before
we start to get rid of the drag by retracting the undercarriage
and the flaps. Then we start talking with air traffic control to
work out how we get back in the landing sequence.’
Most flyers will never
experience a go-around – the world’s major airports report an average of one a day. But if you get a strong sense that
you’re taking off as you come
into land, now you know why.