Electronic Equipment; Cny-7 Interphone System - Kazan Helicopters Mi-17-1V Flight Manual

M..-17-1B. Flight manual
Note: With the ice detector (SO-121) circuit breaker closed, the
ICING (05nE,QEH) annunciator may come on and go out in 15
t030s.
7.2. Electronic equipment
(1) Before switching on the electronic equipment make sure the aircraft DC
system voltage is 28.5 V and the aircraft AC system voltage is 115 V.
Monitor the DC and AC voltages by reading the voltmeters installed on
the overhead electrical control panel in the flight compartment.
7.2.1. CnY-7 Interphone system
The interphone system provides internal communication between the
crew members. In addition, each crew member can use any radio equip-
ment he needs in flight by means of the interphone control box.
To use the interphone system proceed as follows:
(1) The Pilot-Navigator closes the INT (CnY-7) circuit breaker installed on
the RH CB sub-panel of the overhead electrical control panel to energize
the interphone system.
(2) Each crew member connects his headset to the interphone control box
cable.
(3) Set the MAINS 1-2 (CETb 1 - CETb 2) selector switches on the inter-
phone control boxes to 1 (CETb 1).
(4) Call the desired crew member by depressing the interphone button (the
ICS-RADIO (Cny-pA,QVlO) selector switch) on the helicopter control
stick, the CALL (l..lB) button on the interphone control box or the CALL
(BbI30B) button at the additional interphone panel.
In all cases the internal communication between the crew members
should be established and maintained irrespective of the radio communi-
cation selector switch position and the ICS-RADIO (CnY-pA,QVlO) selec-
tor switch position on the interphone control box.
When conducting the internal communication both pilots should simulta-
neously listen to (at a reduced volume) transmission of the station to
which the selector switches of the interphone control boxes are set.
(5) When testing the interphone system make sure the voice messages are
distinct and loud enough. Adjust the volume by the volume controls in-
stalled on the interphone control boxes and the additional interphone
panels.
(6) To listen to the signals received by the automatic direction finders set the
MONITOR MF ADF - VHF ADF (npOCnyw. APK-9 - APK-Y,Q) selector
switch at the Flight Engineer's station to MF ADF (APK-9) or VHF ADF
(APK- Y,Q), as desired. The Pilot (left or right) should depress the CALL
(l..lB) button on his interphone control box in order to establish internal
communication with the Flight Engineer (or the Instructor).
(7) If a crew member occupying the Flight Engineer's station wants to com-
municate with the Pilots, he should set the MONITOR MF ADF - VHF
ADF (npOCYWVlB. APK-9 - APK-Y2) selector switch to the neutral posi-
tion and depress the INT (CnY) button or, leaving the MONITOR MF ADF
-VHF ADF (npOCnYWVlB. APK-9 - APK-Y2) selector switch in the posi-
tion corresponding to the ADF being listened to, depress the CALL
(BbI30B) button on the additional interphone panel.
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