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You are cruising at night and you notice a single fixed white light getting closer. What are you likely approaching?

  • A

    A glider that is coming towards you.

  • B

    An airship or hot air balloon.

  • C

    Another aircraft heading roughly the same way as you.

  • D

    An aerodrome identification beacon.

Refer to figure.
The navigation lights should be:

  • Red on the Left side (110° coverage)
  • Green on the Right side (110° coverage)
  • White at the Rear of the aircraft (140° coverage), which means 70° on each side of the fuselage centerline

In our example, you see a steady white light only which means that the other aircraft is in front of you with similar heading as your aircraft.

Note: An aerodrome identification beacon shall show either coloured flashes alternating with white flashes, or white flashes only. In our example the light is NOT flashing, it is white and steady. Therefore, it cannot be an aerodrome identification beacon.

ICAO Annex 6
Appendix 1.

2. Navigation Lights to be displayed in the air

As illustrate in Figure 1, the following unobstructed navigation lights shall be displayed:

a) a red light projected above and below the horizontal plane through angle of coverage L (110°);
b) a green light projected above and below the horizontal plane through angle of coverage R (110°);
c) a white light projected above and below the horizontal plane rearward through angle of coverage A (140°).

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