NAV
CONTROL  FUNCTION 
A  Controls audio reception level for VOR/ILS and marker beacon identi.cation tones (Pilot, copilot and crewchief stations only). 
B  Controls audio reception level for TACAN and ADF identi.cation tones (Pilot, copilot and crewchief stations only). 
VOX  Controls threshold for voice activation level when VOX ON microphone actuation is selected on by the function selector. 
MIC Selector Switch 
Mode Selector Switch 
1  Select when using SPH–4 low impedance (5 ohm) microphone. 
2  Select when using SPH–4B high impedance (150 ohm) microphone. 
PVT  Selects private ICS between the pilots only or private ICS communications among the medic stations and crewchief. 
ICS  Selects normal ICS operations. 
1  Selects transmission/reception through the VHF/FM 1 radio. 
2  Selects transmission/reception through the UHF-AM radio. 
3  Selects transmission/reception through the VHF/AM-FM radio. 
4  Selects transmission/reception through the VHF/FM 2 radio. 
5  Selects transmission/reception through the HF radio. 
RMT  Enables RAD SEL and UP/DN switches on the collective sticks for radio and frequency selections. 

MASTER RADIO / NAV MONITOR VOLUME CONTROLS VOLUME (PUSH ON / PULL OFF)

VOX  MODE 
CONTROL  SELECTOR  AK0086 
SA 

CONTROL  FUNCTION
Function Selector Switch
HOT MIC  Continuous ICS or radio communications without pressing a PTT switch.
VOX ON  ICS keys while operator is speaking. Not available when Mode Selector switch is to PVT.
NORM  Use press-to talk button for ICS and radio communications.
ICS OFF  Turns ICS off.
3.5.2 Intercommunication Keying System. Keying of the ICS system is done by the controls listed at the following stations:
3.5.2.1 Pilot or Copilot Station. An ICS/RADIO trig-ger switch on the top of each cyclic stick, or by a switch on the .oor at the pilot’s left and the copilot’s right foot.
3.5.2.2 Exterior Jack (Maintenance Station). A pushbutton at the end of the exterior walkaround cord.
3.5.2.3 Medic 1, Medic 2, and Crewchief. A push-button at the end of the cord.
3.5.2.4 VOX Operation. For voice actuated intercom at all stations:
1.
Function selector switch -VOX ON.

2.  
VOX knob -Adjust, until speaking into the mi-crophone keys the intercom system.

3.5.3 Modes of Operation.
3.5.3.1 Primary Operation Check. There are several methods of intercommunication operation. In all cases, no operation action is required to receive intercom signals other than adjusting the VOL control for a comfortable level at the headset.
3.5.3.2 Intercommunication (Cockpit).
1.
Transmitter selector switch, any position when using cyclic switch, ICS,or PVT for foot switches.

2.
Function selector switch  -NORM,or VOX ON , as desired.

3.
Key switch -ICS/RADIO switch on pilot’s or copilot’s cyclic, or foot switch at pilot’s and copilot’s positions. Speak into the microphones in VOX ON mode.

3.5.3.3 Intercommunication (Cabin).
1.
Transmitter selector switch -ICS,or PVT.

2.
Function selector switch  -NORM,or VOX ON , as desired.

3.
Key switch -switch on pilot’s or copilot’s cy-clic, or foot switch at pilot’s and copilot’s po-sitions. Speak into the microphones in VOX ON mode.

3.5.3.4 External Radio Communication.
1.
Transmitter  selector -Desired position, 1 through 5.

2.  
ICS/RADIO trigger switch on cyclic stick, or foot-operated push-to-talk switch -press; speak into microphone while holding switch; release to listen.
　
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