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HF-9000 Series Control
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2A-23-40: Integrated Automatic Tuning System
THIS SECTION APPLIES TO AIRCRAFT SN 1310 AND SUBSEQUENT
1. General Description:
In Aircraft 1310 and subsequent, integrated control and display of aircraft
communications and navigation systems is provided by Collins RTU-4200 series
Radio Tuning Units (RTUs). The integrated control includes the setting of radio
frequencies / channels and modes as well as optional control of radio volume. The
RTUs provide single point control of both on-side and cross-side systems from
either the pilot’s or copilot’s positions.
RTU-4200 standard features include the following:
• COM (Communications) Control Function
• NAV (Navigation) Control Function
• DME (Distance Measuring Equipment) Control Function
• ATC (Air Traffic Control Transponder) Control Function
• ADF (Automatic Direction Finder) Control Function
On the RTU-4210, TCAS (Traffic Collision Avoidance System) provisions are
included. The RTU-4220 includes all features of the RTU-4200 and RTU-4210,
plus the capability to display an HSI (Horizontal Situation Indicator).
The RTU is designed to be installed in pairs, with each RTU normally controlling
the on-side systems. The RTU is capable, however, of controlling cross-side
systems by selection of cross-side tuning or reversionary tuning is selected.
Cross-side tuning obviates the need for reaching across the pedestal when both
RTUs are functioning normally. Reversionary tuning allows control of both on-side
and cross-side systems in the event that one RTU should fail.
In addition to on-side and cross-side RTU tuning, systems may be remotely tuned
through the RTU. Manual (keyboard) and FMS tuning commands may tune both
the on-side and cross-side RTUs. Remote tuning commands from a CTL (remote
controller) may also tune the pilot’s RTU COM and NAV functions.
All RTUs have the ability to display RTU / system / radio diagnostic data.
Additionally, some RTUs provide tuning capability of a third VHF communications
transceiver and one or two High Frequency (HF) communication transceivers.
2. RTU Displays:
The RTU display structure is made up of three tiers: top level displays, main
display pages and preset pages. Two error pages also exist that can be shown
from any level: a cross-side radio tuning inoperative page and a configuration
error page. Depending on configuration, an HSI display may be accessible from
the top level displays.
A. Top Level Displays:
The top level display consists of the top level page and, if installed, a
second top level page. The top level page is shown at power-up and when
no RTU control has been selected for a period of time. If installed, the
second page can be accessed by pressing the NEXT PAGE line select key.
The top level displays show subdisplays for each of the systems controlled
by the RTU and provide access to the second tier of RTU display structure,
the main display pages.
Subdisplays are normally shown on the RTU with which the system is
paired (i.e., COM 1 subdisplay is shown on pilot’s RTU, NAV 2 is shown on
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copilot’s RTU, etc.). Subdisplays for single systems (TCAS, etc.) are
shown on both the on-side and cross-side RTUs.
The top level display normally shows subdisplays for the COM, NAV, ATC
and TCAS systems. If TCAS is not incorporated, the ADF system
subdisplay is shown. The second top level page, if present, shows
subdisplays for items not shown on the top level page and may include
ADF, HF, HSI and a third COM.
The information contained on top level subdisplays includes radio
frequencies, presets, codes and mode annunciators.
Labels (i.e., COM1, ATC1, TCAS, etc.) are shown at top of each
subdisplay. These labels identify the systems and indicate the RTU with
which they are associated. Labels for single systems do not show a side
number.
B. Main Display Pages:
Main display pages are accessed from the associated system subdisplay
on the top level display. Information shown for an individual system on the
top level display is also shown on that system’s main display page, along
with additional controls. Individual main display pages also provide access
to preset pages. To return to the top level page from a main display page,
the RETURN line select key is depressed.
　
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