Cockpit Philosophy Of Airbus(A321.A320,A319,A318)


Prior to the design of the A320 family aircraft, the designers examined

previous generation aircraft cockpit system indications. A decision was

made on the system indicator lights on the overhead panel that indicator

lights do not come on when systems are in normal operation and there

are no failures.

This ergonomic design enabled the pilots to immediately see when a

system is faulty or has been manually shut off.

Most of the pushbuttons with light have two stable positions: pressed in

and released out, each position is related to a control signal sent to a


Pressed in (recessed):

- normally used system activation (AUTO or ON),

- temporarily used system activation (ON),

- system activated for maintenance operation (ON) or override (OVRD).

Released out (flush with the panel):

- deactivation of a system (OFF),

- manual activation of a system (ON),

- activation of an alternate system (ALTN).

Some pushbuttons have only one stable position:

- released out.

When pushed, they send a control signal to the system.


The pushbuttons light and annunciator lights are in different colors

according to their function.

In normal operation, only green lights and, sometimes, blue lights

come on.


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