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PRODUCTION AIRCRAFT SYSTEMS 2A-23-00
Page 33
May 30/02
Revision 7
L. Circuit Breakers (CBs):
The integrated automatic tuning system is protected by the following CBs:
Circuit Breaker Name: CB Panel: Location: Power Source:
RTU #1 CP F-7 EMER DC Bus
RTU #2 CP F-8 ESS DC Bus
4. Limitations:
A. Flight Manual Limitations:
There are no limitations for the integrated automatic tuning system at the
time of this revision.
B. Pilot’s Manuals:
Consult the Collins RTU-4200 Series Pilot’s Guide, Collins Publication
Number 523-0777-900, Revision 2, dated May 1, 1996 (including
Addendum 2, dated June 16, 1998) for operating procedures of the RTU-
4200 series system.
OPERATING MANUAL
2A-23-00 PRODUCTION AIRCRAFT SYSTEMS
Page 34
May 30/02
Revision 7
Collins RTU-4200 Series
Radio Tuning Unit
Figure 7
OPERATING MANUAL
2A-23-00
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May 30/02
2A-23-50: Intercommunications System
1. General Description:
The Intercommunications System (ICS) is an audio integrating system that ties in
the communication and navigation receiver audio inputs and outputs to the
cockpit speakers, ICS jacks, headsets and microphones.
A typical ICS system consists of:
• Two Baker audio control panels, one located on each upper side console
• Two communications jacks panels (labeled COMM JACKS), one located
on each side console
• Two ICS receptacles (labeled ICS JACK), one located in the forward
external switch panel, the other located in the tail compartment
2. Description of Subsystems, Units and Components:
A. Baker Audio Control Panel:
A dualized Baker Audio Control System (No. 1 system for the pilot and No.
2 system for the copilot) is installed in the aircraft. The ICS audio control
panel and audio amplifier are housed within the same unit, providing an
integrated audio system capable of selection and volume control of all
installed radio equipment. Selection can be made of all communications,
receive and microphone functions including onboard communications (i.e.,
passenger address, cabin and cockpit interphone).
Two types of pushbutton switches are used. Microphone selection is
accomplished by an interlocking switch permitting only one button to lock
down at one time. When another button in the microphone selector group is
depressed, the previously depressed button is released automatically. The
second type of pushbutton switch is known as an alternate action or pushpush
switch (i.e., the switch is on when depressed and may be released to
the off position by depressing again). The push-push switch type of switch
is used for all selections of receivers and other functions except the
microphone selector.
The audio control panels have a self-contained transistor isolation and
speaker amplifier with audio leveling. The system includes use of a filter
network to remove the 1020 Hz identifier from the navigation or ADF
receiver if desired.
In case of amplifier failure or complete power loss to the system, an
emergency operation mode allows receiver selection and direct passthrough
of all normal inputs to the headphones and use of the hand
microphone for transmission purposes.
B. COMM JACKS Panels:
A communications jack panels (labeled COMM JACKS) is located on each
side console. Each panel contains a receptacle for a hand-held
microphone (HAND MIKE), a boom microphone (BOOM MIKE) and a set
of headphones (HEAD PHONE).
C. Cockpit Microphones:
Hand, boom or mask microphones may be used. The desired output (radio
transmitter, paging or cabin telephone) is first selected. The hand
microphone, if used, is keyed in the usual way. If the pilot is wearing the
oxygen mask, the ICS key on the control wheel must be used to operate
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-23-00
Page 37
May 30/02
Revision 7
the mask microphone. A boom microphone may be used if desired by
connecting to the BOOM MIC jack. Push-To-Talk (PTT) is activated using
the ICS MIC switch.
D. ICS Receptacles:
Two ICS receptacles (labeled ICS JACK), one located in the forward
external switch panel, the other located in the tail compartment, are
provided for intercommunication with ground personnel. Both receptacles
are the “single plug” (combined microphone and headset plug) type.
3. Controls and Indications:
(See Figure 8.)
A. EMG Switch:
Selection of the red EMG switch enables the emergency operation mode.
This permits emergency operation of the audio system, bypassing the
isolation amplifier. In the EMG position, the pilot may select the receivers
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