TM 1-1510-218-10
3B-2
3B-6. AUDIO CONTROL PANELS.
a. Description.
Individual
audio
control
panels, part of the radio panel, are provided for the
pilot and copilot. The controls and switches provide
for selection of transmission on VHF, UHF, or HF
transmitters and volume control of communication,
navigation and interphone audio signals. Figure 3B -1
illustrates the pilot’s and copilot's audio control panels.
b. Controls and Functions.
(1) PILOT
and
COPILOT AUDIO OFF
Switches. Permits monitoring of selected audio
regardless of position of transmitter selector switch.
(a) VHF 1. Permits monitoring of #1
VHF audio.
(b) VHF 2. Permits monitoring of #2
VHF audio.
(c) HF. Permits monitoring of HF audio.
(d) UHF. Permits monitoring of UHF
audio.
(e) NAV 1. Permits monitoring of #1
NAV audio.
(f) NAV 2. Permits monitoring of #2
NAV audio.
(g) MKR BCN 1, 2. Permits monitoring
of #1 and #2 marker beacon audio.
(h) DME/TACAN. Permits monitoring of
DME/TACAN audio.
(i) ADF 1. Permits monitoring of #1
ADF audio.
(j) ADF 2. Permits monitoring of #2
ADF audio.
(2) Pilot’s/Copilot’s
Transmitter
Select
Switches. Controls operation of selected system.
(a) VHF 1. Routes key and mic signals
to the #1 VHF transceiver.
(b) VHF 2. Routes key and mic signals
to the #2 VHF transceiver.
(c) HF. Permits reception of audio from
the HF transceiver and routes key and microphone
signals to the HF transceiver.
(d) UHF. Permits reception of audio
from the UHF transceiver and routes key and
microphone signals to the UHF transceiver.
(e) PA. Permits cabin paging.
(3) AUDIO
/
SPKR
/
OFF
Switch.
Determines where selected audio will be heard.
(4) VOLUME
Control.
Controls
audio
volume.
(a) SPKR. Adjusts volume of cockpit
speakers.
(b) PH. Adjusts volume of headset.
(c) PA.
Adjusts
volume
of
cabin
speakers.
(d) DME/TAC.
Adjusts
volume
of
DME/TAC audio. Located on pilot's audio panel only.
(5) VOICE / BOTH / RANGE
Switch.
Controls both voice and range tone.
(a) VOICE. Kills range and allows voice
(ADF and VOR).
(b) BOTH. Allows both voice and range
(ADF and VOR).
(c) RANGE. Kills voice and allows 1020
Hz range tone (ADF and VOR).
(6) MKR BCN 1 & 2 HI / LO / TEST Switch
and VOL Control. Selects either sensitivity or TEST
function.
(a) HI. Selects high sensitivi ty.
(b) LO. Selects low sensitivity.
(c) TEST. Permits testing of marker
beacon's annunciators.
(d) VOL control. Adjusts volume of
marker beacon audio.
(7) AUDIO EMER / NORM Switch. Controls
routing of received audio signals. Located on pilot's
audio panel only.
(a) EMER.
Audio signal bypasses
amplifier. Applies audio signal to headphone only.
(b) NORM . Routes audio signal through
amplifier to speaker or headphone.
