Kazan Helicopters Mi-17-1V Flight Manual page 181

MI1-17-1B. Flight manual
(4) Depress the TEST (KOHTPOnb) button on the control panel. If the radio
station is serviceable and operates in reception mode the TEST light, lo-
cated on the control panel, goes on and a noise is heard in the head-
phones; if the radio operates in transmission mode an aural signal should
be heard and the TEST light should go on.
(5) Functionally check the radio station by establishing two-way communica-
tion with other radio stations, the noise suppressor being ON/OFF or us-
ing the built-in test
Note: 1. If the TUNING annunciator does not go out after 5 seconds set
the operating frequency again. If after that the TUNING annun-
ciator persists in being illuminated the radio station is failed.
2. If the EMERG (emergency) annunciator goes on switch the ra-
dio station off and turn it on again. If the EMERG annunciator
persists in being illuminated it means that the radio power sup-
ply circuit is failed. Switch the radio off.
(6) To operate the radio in flight, proceed as for testing. If the readability gets
worse switch the NS off. To turn the radio station off, set the COMM
RADIO circuit breaker to OFF position.
7.2.4. 6AKnAH-20 VHF Radio.
To use the command VHF radio proceed as follows:
(1) Set the radio communication means selector switch, located on the inter-
phone control box in the cockpit, to VHF position; set the INT-RADIO se-
lector switch to RADIO position.
(2) Switch on the CMND RADIO and INT circuit breaker, located on the left
CB panel of overhead electric panel.
(3) Set the left operating frequency setting knob, located on the radio control
panel, to a position which corresponds to first three digits of a required
communication channel; set the right knob to a position which corre-
sponds to last three digits of a required communication channel. Set the
NS switch to the lower position.
(4) Using the GENERAL controls, located on the interphone control box, ad-
just the required volume. If the sensitivity of the receiver is normal the re-
ceiver noise should be heard in the pilot's and co-pilot's headphones
(5) To change over the radio from reception to transmission press the INT-
RADIO trigger, located on the helicopter control sticks, until the second
step starts operating and make a trial voice transmission: your own mes-
sage should be heard in the headphones.
(6) To switch on the noise suppressor set the NS switch, located on the con-
trol panel, to NS position.
(7) Check the radio for operation by establishing two-way communication
with other radio stations or by side-tone monitoring and listening to noise
in the headphones.
(8) Switch on the STAND-BY RADIO circuit breaker, set the selector switch,
located on the interphone control box, to KP position and check the
6AKnAH-20 stand-by radio for operation proceeding the same way.
Caution: While one of 6AKnAH-20 radio is operating in transmission
mode, a signal received by the other radio becomes inter-
locked.
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