Airbus A320 Maintenance General - Push Button Principles

Push Button Principles
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):
- System deactivation (Off)
- Manual activation of a system (On)
- Activation of a alternate system (ALTN)

- In normal operation, no lights, green lights and sometimes blue lights are illuminated