MD Helicopters 369-500, Инструкция по техническому обслуживанию

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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[ Chapter 97 TOC ]
97-06-00
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Revision 12
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Neither this document nor any part hereof may be reproduced or transferred to
other documents or used or disclosed to others for manufacturing or any other
purpose except as specifically authorized in writing by MD Helicopters, Inc.
Copyright
©
1999 − 2016 by MD Helicopters, Inc.
INTEGRATED INTERPHONE COMMUNICATION SYSTEM
(CARTER)
DESCRIPTION AND OPERATION
1. General
The integrated interphone communication
system (ICS) provides an intercommunication
capability between pilot, copilot and passenger
stations. A CE 500 HT-3G ICS control unit
installed on the back of the instrument panel
allows 1) selection, control, and monitoring of
voice communication, 2) monitoring of audio
signals from communications transceivers
(COMM 1 and COMM 2), and 3) monitoring of
the vhf navigation (NAV) receiver and auto­
matic direction finder (ADF) receiver. Received
radio signals may be monitored at all intercom
stations. In addition, the pilot or copilot may
select the COMM 1 or COMM 2 transceiver for
voice transmission to other aircraft or ground
stations.
A headset-microphone (Ref. Sec. 97-01-00) is
located at each intercom station. Headset-mi­
crophones at the copilot, center front, left rear
and right rear positions interface with the ICS
by means of adaptors; an adaptor is a headset
switch and jack assembly (switch/jack)
containing a RADIO-ICS switch. Voice
transmission over the interphone from an
intercom station (except the pilot's station) is
selected by pressing the switch/jack at that
station to the ICS position. The middle
(released) switch position selects vhf receiver
audio and is the listening position for inter­
phone and monitoring the vhf COMM, vhf
NAV, ADF and DME receivers. Pressing the
switch/jack to the RADIO position, at the
copilot's station only, selects the transmitter of
the vhf COMM transceiver. Pressing the
switch/jack at one of the passenger intercom
stations to the RADIO position has no effect.
Switch/jacks are removed by disconnecting
them at the bulkhead headset connectors.
The pilot's headset-microphone does not
require an adaptor to interface with the ICS.
The installed pilot's headset jack contains a
phone jack that mates with a standard
U-174/U interphone plug connected to the ICS
control unit via helicopter wiring. At the pilot's
position, a RADIO-ICS switch on the cyclic
stick (Ref. Sec. 67-10-20) is used in conjunc­
tion with his headset-microphone. Pressing
the switch to the ICS position selects voice
transmission over the interphone. Pressing the
switch to the RADIO position keys the
transmitter of the vhf COMM transceiver. The
middle (released) position of the switch selects
vhf receiver audio, and is the listening position
for interphone and monitoring of the vhf
COMM, vhf NAV, ADF and DME receivers.
(Ref. Figure 1) The COMM 1-XMIT-COMM 2
radio selector switch assembly (S13) enables
the pilot or copilot to select between vhf
COMM 1 or vhf COMM 2 radio for voice
transmission, and controls application of
transmit keying microphone audio signals to
the selected radio. The assembly consists of a
DPDT toggle switch and attaching wiring.
Wiring harness assemblies interconnect the
ICS components. In helicopters with Slim-
Line instrument panels or RH command T
panels, a 7.5 ampere NAV/COM circuit
breaker (CB108) protects the interphone
system and vhf radio equipment from circuit
overloads. In helicopters with LH command T
panels, a 3 ampere AUDIO circuit breaker
(CB209) serves this function. The interphone
system contains provisions for an auxiliary
audio input for use with any other optional
audio source. The interphone system functions
with or without radio equipment installed.
A. CE 500 HT − 3G ICS Control Unit
Description
(Ref. Figure 101, Figure 102, Figure 103 or
Figure 104) The ICS control unit is a solid
state device containing circuits for audio
filtering, amplification, switching, radio
transmitter keying and control. The unit
interconnects the switch/jacks, helicopter
wiring and associated avionics equipment. A
removable cover on the unit provides access to
internal components on circuit boards.
(1). Microphone Audio:
During ICS operation, microphone
audio signals from intercom stations
are input to the ICS control unit for