Ask Pilot: What can pilots see at night?

Anyone who has ever star-gazed will know that aircraft use lights when flying, pesky planes masquerading as shooting stars throughout the hours of darkness.

But the powerful LED spotted from the ground, 35,000 feet below, is not a headlight, guiding the path of the 8.30pm service to Kuala Lumpur; more likely a beacon to help other pilots spot the plane in the air. At altitude, planes do not use headlights in the traditional sense.

Do planes have headlights?

Though aircraft do not have headlights in the traditional sense, they do have a plethora of illuminations, each performing a different function.

The lights closest to those we might have on our cars or motorbikes are the landing lights employed by the flight deck on approach to an airport. They are positioned in different places on different aircraft, from the wing to the fuselage.

These not only help the pilot land at night but also make the aircraft more noticeable to anyone in the vicinity. To become yet more conspicuous some pilots will flash their landing lights on final approach or when they have deployed their landing gear to let the air traffic control tower know.

Other lights on an aircraft include red and green LEDs on each wing to indicate to other aircraft at night which direction the plane is facing - green right, red left. There are also anti-collision beacon lights on the top and bottom of the fuselage that rotate reddish orange to produce a flashing effect. These are turned on as long as the plane’s engines are running.

How powerful are plane lights?

Lighting experts Oxley, a company which began life producing capacitors for the military in the Second World War, today serves all sorts of aviation clients with the lights needed for a modern aircraft.

Among them are landing lights able to operate in temperatures from -54C to 71C. Their peak intensity is 600,000cd - that’s 600,000 candela, offering about 600,000 the luminous intensity of a single candle.

What can pilots see from the cockpit?

Given that they are often operating above the cloud in near-absolute darkness, one might think that the view from the cockpit is not up to much.

Beyond the city lights laid out below, pilots also get a front row seat to weather phenomena, from storm clouds and lightning to the Northern Lights.

What happens when pilots cannot see anything?

Pilots are trained to perform “instrument landings” when they execute an approach and touch-down in minimal visibility, most often thanks to extreme weather, using only the information and positioning delivered on screens in the cockpit.

Airports also help, providing an Instrument Landing System (ILS), where pilots lock onto a landing beam emitted from the runway.

#airplane #cockpit

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