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NOTE(S):
(1) Aircraft 1156 and subsequent.
4. Limitations:
There are no limitations for the airflow and temperature control system at the time
of this revision.
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Airflow And Temperature
Control System Block
Diagram
Figure 6
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Refrigeration System
Block Diagram
Figure 7
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Cabin / Cockpit TEMP
CONTROL Panel
Figure 8
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Cockpit Annunciators
Figure 9
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COMMUNICATIONS
2A-23-10: General
The communications system for the Gulfstream IV, shown in Figure 1, provides the flight
crew with a means of communicating with ground stations and other aircraft using Very
High Frequency (VHF) and High Frequency (HF) communications equipment. Provisions
are also included for intercommunication with others aboard the aircraft and on the
ground. Additionally, the most recent thirty (30) minutes of all audio signals transmitted
and received by cockpit crew members is recorded by the cockpit voice recorder system
in the event it should be needed for investigatory purposes. An ARTEX 406 MHz
Emergency Locator Transmitter (ELT) system provides triple frequency homing
transmissions when activated.
The communications system is divided into the following subsystems:
• 2A-23-20: VHF Communications System (Collins VHF-422 Transceivers with
Gables Digital Frequency Control Units: Aircraft SN 1000 - 1309)
• 2A-23-30: HF Communications System (Collins HF-190 and HF-9000 Series
Transceivers)
• 2A-23-40: Integrated Automatic Tuning System (Collins RTU-4200 Series Radio
Tuning Unit: Aircraft SN 1310 and subsequent)
• 2A-23-50: Intercommunications System
• 2A-23-60: Cockpit Voice Recorder System
• 2A-23-70: Emergency Locator Transmitter System
Note To Operators: Because of the numerous possible communication system
configurations, modifications and software levels, the data contained in these sections is
limited to equipment description, controls and indications. For further details and specific
operational procedures, the latest approved version of the applicable vendor-supplied
pilot’s manuals should be consulted. Where possible, these manuals will be identified in
the appropriate section.
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GIV Communications
System Components
Figure 1
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2A-23-20: VHF Communications System
THIS SECTION APPLIES TO AIRCRAFT SN 1000 - 1309
1. General Description:
The VHF communications system provides the flight crew with two-way VHF
communications in the AM frequency range of 118.000 to 151.975 MHz. Channel
spacing of 25 kHz provides 1,360 discrete channels.
For aircraft with 8.33 kHz channel spacing capability, available discrete
channels are increased three-fold to 4,080 channels.
The VHF communications system is further divided into the VHF No. 1 system
and the VHF No. 2 system. System design is such that the No. 1 and No. 2 VHF
systems are isolated from each other and independent in operation. This helps to
prevent any interference problems.
A typical installation consists of two Collins VHF-422 transceivers installed on a
shelf inside the radome, two Gables digital frequency control units and two VHF
antennas. In addition to normal system control using the digital frequency control
units, the FMS is capable of controlling both VHF systems via the RTE/RTI switch
on the Marker Beacon (MKR BCN) controller.
2. Description of Subsystems, Units and Components:
A. VHF Transceivers:
Two Collins VHF-422 transceivers, referred to as the VHF No. 1
transceiver and VHF No. 1 transceiver, are installed on a shelf inside the
radome.
B. Digital Frequency Control Units:
Two Gables digital frequency control units, commonly referred to as the
　
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