MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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[ HMI − 3 Book TOC ]
[ Chapter 97 TOC ]
97-06-00
Page 101
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)
TROUBLESHOOTING
1. Integrated Interphone Communication
System Troubleshooting
(Ref. Figure 101, Figure 102, Figure 103 or
Figure 104, Table 101 and other avionics
sections of this manual which apply to your
equipment)
NOTE:
A trouble in one installation may affect
a function of another installation when in­
stallations use equipment in common, or
function with equipment of related installa­
tions. This especially applies to intercom
and vhf radio control equipment and asso­
ciated radio installations.
2. CE 500 HT − 3G ICS Control Unit
Troubleshooting
(Ref. Figure 101, Figure 102, Figure 103 or
Figure 104 and Table 102)
Table 101. Troubleshooting ICS System
Symptom Probable Cause Corrective Action
WARNING: Before removing or installing components connected to the electrical system, ensure that
all electrical power is OFF. If units are not immediately replaced, ensure that all electrical connectors
are suitably capped and stowed and all loose cable ends are properly insulated to prevent the
possibility of shorting. Serious injury or death could result from voltages present in the electrical
system.
NOTE:
The following general troubleshooting information also applies to other avionics installations that may be
in the helicopter, since a trouble in equipment in one installation that is commonly used by other installations
can cause a symptom with associated installations. Disregard information that pertains to equipment or instal-
lations that are not installed.
GENERAL
No dc power to equipment of an
installation.
Defective associated circuit
breaker.
Replace circuit breaker.
No dc power on helicopter main dc
bus.
(Ref. Chap. 96 for electrical system
fault isolation).
Circuit breaker trips. Overload or short circuit in
equipment of associated
installation.
Isolate to the specific installation;
then troubleshoot the installation.
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.