November 1, 2014 - Question: If radio contact
failed completely, how else would air traffic
control communicate with an aircraft?
Answer: If the aircraft is on the ground, there
are several ways to communicate if its radio has
failed. Each tower is equipped with a
light gun and the controller can point this
at an aircraft. By using white, red and green
light signals, the controller provides
instructions to the pilot.
The controller may also contact an airline who
can relay a message if its aircraft is equipped
with ACARS (Aircraft Communications Addressing
and Reporting System), which is a type of
communication system using technology much like
a text message.