- PLUG:
-Audio jack for monitoring the operations of the cockpit voice recorder.
ON:
-PASSENGER SYS ON light (21VU) goes off and the tape announcement stops. The TMR RESET ON light comes on.
FAULT:
-Illuminates in case of time delay failures (>30 seconds) to deenergizes the unit door latches.
- OFF or AUTO mode:
-Communincates with service interphone jacks is possible when on ground (L/G compressed).
ON or MANUAL mode:
-Communication is possible with L/G no compressed. On light illuminates white.
- AUTO mode:
-Causes the avionics compartment lighting to com on automatically when the avionics compartment door is opened.
ON mode:
-Turns the avionics compartment light on.
- ON:
-The blue electric pump is energized on the ground provided the ELEC PUMP PB switch on HYD panel is at auto positon.
- OFF:
-The respective electrohydraulic valve closes and hydraulic supply to primary flight controls is shutoff.
- PUSHED:
-The push button must be held durning the test. The APU Master switch must be selected ON. The APU fire warning, auto extinguishing and shut down curcuits are tested. The sequence duration is 10 seconds. The OK light comes on to indicate a succesful test. The APU will shut down if it is operating durning the test.
- DEPRESSED:
-When depressed, test curcuit is reset.
- ON:
-FADEC is electrical supplied on ground provided the ENG Fire switch is not released.