COCKPIT PHILOSOPHY OF AIRBUS
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
system.
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.
PUSHBUTTON COLOR PHILOSOPHY
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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