MD Helicopters 369-500, Инструкция по техническому обслуживанию

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Table 101. Troubleshooting ICS System (Cont.)
Symptom Corrective Action Probable Cause
NOTE:
A single circuit breaker that is part of a specific installation may also be used for other installations. Be sure
to check all installations that can affect the circuit breaker.
Identical trouble symptom common
to two or more installations.
Defective equipment in one
installation that is also used by
other installation(s).
Isolate defective equipment to the
applicable installation; then
troubleshoot the installation.
Trouble isolated to one function or
location.
Faulty terminal block connection or
wiring in affected circuit.
Check and repair connection or
wiring.
Panel lamp does not light. Lamp filament open. Replace lamp in affected unit.
NOTE:
Before troubleshooting other avionics installations for audio troubles, or other functions that are depen-
dent upon intercom and vhf radio equipment, be sure to first check that intercom and vhf radio equipment
functions correctly. Troubles that may occur in intercom and vhf radio control equipment that affect radio oper-
ation are listed in the following troubleshooting procedures for intercom and vhf radio equipment. Also,
troubles that may occur in equipment or other installations that affect intercom and radio operation are listed
in these procedures.
INTERCOM AND RADIO CONTROL EQUIPMENT
NOTE:
Station in following procedures refers to radio/intercom station in the helicopter.
Radio and ICS modes of operation
are inoperative at all stations.
Defective audio control panel. Repair or replace audio control
panel.
Cannot transmit from one station to
any other station; normal ICS and
radio operation from other stations.
Defective microphone in
headset − microphone.
Repair or replace headset − micro-
phone.
Defective associated RADIO − ICS
switch.
Repair or replace switch.
Cannot receive interphone and
receiver audio at one station;
normal ICS and radio operation at
other stations.
Defective headset in headset − mi-
crophone.
Repair or replace headset − micro-
phone.
Cannot transmit and receive audio
between any stations for ICS
operation; radio transmission and
reception normal at all stations.
Defective interphone (ICS) keying
circuit in audio control panel.
Repair or replace audio control
panel.
Defective microphone audio circuit
or amplifier in audio control panel.
Repair or replace audio control
panel.
Defective audio circuits in vhf
COMM radio associated with
intercom control panel.
Repair or replace vhf COMM radio.
Cannot transmit radio signals, and
cannot transmit and receive audio
between any stations; radio
reception normal at all stations.
Defective microphone filter. Replace microphone filter.
Defective microphone audio circuit
or amplifier in audio control panel.
Repair or replace audio control
panel.
Cannot transmit and receive audio
between any stations, and cannot
receive radio signals; radio
transmission normal at all stations.
Defective phone audio amplifier
circuits in audio control panel.
Repair or replace audio control
panel.
Defective audio circuits in vhf
COMM radio.
Repair or replace vhf COMM radio.