Beechcraft C-12C Operator And Technical Reference Manual page 357

1. PILOT/COPILOT AUDIO OFF Switches
2. Copilot's Transmitter Select Switch
3. Copilot's AUDIO / SPKR / OFF Switch
4. Copilot's Audio VOLUME Controls
5. Copilot's VOICE / BOTH / RANGE Switch
6. MKR BCN HI / LO / TEST Switch & VOL
Control
(a) HI – Selects high sensitivity.
(b) LO – Selects low sensitivity.
(c) TEST – Permits testing of marked
beacon annunciators.
(d) VOL Control – Adjusts volume of
marker beacon audio.
(7) Pilot's VOICE / BOTH / RANGE Switch –
Controls both voice and range tone.
(a) VOICE – Kills range, allows voice
(ADF and VOR).
(b) BOTH – Allows both voice and
range (ADF and VOR).
(c) RANGE – Kills voice, allows 1020
Hz range tone (ADF and VOR).
(8) AUDIO EMER / NORM Switch – Controls
routing of received audio signals. Located on pilot's
audio panel only.
Figure 3C-1. Audio Control Panel
amplifier. Applies audio signal to headphone only.
through amplifier to speaker or headphone.
volume.
speakers.
speakers.
DME/TAC audio. Located on the pilot's audio panel
only.
Determines where selected audio will be heard.
Controls operation of selected system.
7. Pilot's VOICE / BOTH / RANGE Switch
8. AUDIO EMER / NORM Switch
9. Pilot's Audio VOLUME Controls
10. Pilot's AUDIO / SPKR / OFF Switch
11. Pilot's Transmitter Select Switch
T1
(a) EMER – Audio signal bypasses
(b) NORM
(9) Pilot's VOLUME Control – Controls audio
(a) SPKR – Adjusts volume of cockpit
(b) PH – Adjusts volume of headset.
(c) PA – Adjusts volume of cabin
(d) DME/TAC – Adjusts volume of
(10) Pilot's AUDIO / SPKR / OFF Switch –
(11) Pilot's Transmitter Selector Switch –
TM 1-1510-218-10
– Routes audio signal
3C-3