APU Power Maintenance Switch

• NORM - Normal position.
• TEST - Maintenance use only. No flight crew procedures require the use of this switch.

Electronic Engine Control Maintenance Switches

• NORM - Normal position.
• TEST - Maintenance use only. No flight crew procedures require the use of these switches.

Cargo Temperature Selectors

• OFF - Shut off bleed air to selected compartment.
• LOW - Compartment is automatically kept at a low temperature (approximately 45° F).
• HIGH
  • Compartment is automatically kept at a high temperature (approximately 70°F).
  • Bulk compartment only; ventilation fan operates continuously.

Ground Test Switch

• NORM - Normal position.
• ENABLE - Unknown at this moment.

Speaker
Audio output of the Cockpit Voice Recorder.

Meter
Visual output of the Cockpit Voice Recorder.

Test Switch
When pushed and held for 5 seconds, tests all four cockpit voice recorder channels.

Erase Switch
If pushed and held for 10 seconds, erases the voice recorder when:

• Airplane on ground
• AC power available
• Parking brake set

Headset Jack
Accepts a Headset to monitor audio or test tone.