CVR HeadSet
Audio Jack for monitoring the operation of the Cockpit Voice Recorder. Used by Maintenance Tech Personnel.

Maintenance Oxygen Switch

• TMR Reset Switch - Resets control circuit when selected ON, and ON light illuminates. PASSENGER SYS ON Light goes off.
• TMR Reset Fault Light - Illuminates with a failure to de-energize the oxygen mask door latches.

SVCE INT OVRD Switch

• AUTO - Enables communication to the interphone jacks. The function is inoperative when the landing gear is not compressed.
• ON - Used by Maintenance to allow communication when the landing gear is not compressed. The ON light illuminates.

Avionics COMPT LT Switch

• AUTO - Causes the avionics compartment lighting to come on automatically when the avionics compartment door is opened.
• ON - Turns the avionics compartment lighting on.

Blue Pump OVRD Switch (Guarded)

• ON - The Blue electric pump is energized, provided the BLUE ELEC PUMP switch, located on the hydraulic panel, is in AUTO.

Leak Measurement Valve Switches (Guarded)
Used for Maintenance ground test only. When the light is on, portions of the Hydraulic system are inoperative.

APU TEST Switch
Tests APU Fire Warning, auto extinguishing and shutdown circuits. For test, MASTER switch must be ON and TEST switch must be held down for 10 seconds. The OK light comes on to indicate a successful test.

Reset Switch
Resets test circuit.

ENG FADEC GND PWR Switches (Guarded)

• ON - Supply the associated FADEC with ground power, provided the ENG FIRE switch is not released.
• Off - Disconnect ground power.