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C. HSI Page:
If incorporated, the HSI page is accessed from either the top level page or
the second top level page. The HSI page shows the familiar HSI display
with compass card, course pointer, TO-FROM pointer, lateral and vertical
deviation display, DME distance, and marker beacon annunciators. In
addition, the HSI page provides control for the COM, NAV and ATC
systems. To return to the top level page from the HSI page, the RETURN
line select key is depressed.
D. Preset Pages:
Preset pages for a particular system are accessed by pushing the PRESET
PAGE line select key on the desired system’s main display page. Active
frequencies, presets and mode annunciators are shown on the preset
pages, along with controls for preset programming and tune mode
selection. Unless otherwise specified, four of the maximum presets
available are shown on each preset page. Twenty presets are normally
available for each of the COM, NAV, ADF and HF systems. To return to the
main display page from a preset page, the RETURN line select key is
depressed.
3. Controls and Indications:
(See Figure 7.)
A. ON / OFF Switch:
An ON / OFF switch may or may not be present, depending on the
installation. If present, the ON / OFF switch is incorporated into the
brightness (BRT) knob. The RTU is selected ON by rotation of the BRT
knob clockwise out of the OFF detent, and OFF by rotation of the BRT
knob fully counterclockwise into the OFF detent.
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2A-23-00 PRODUCTION AIRCRAFT SYSTEMS
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B. Brightness (BRT) Knob:
In installations where RTU brightness is controlled by the aircraft’s master
brightness control, the RTU BRT knob is used in conjunction with the
aircraft’s master brightness control to achieve the desired display
brightness. In installations where RTU brightness is not controlled by the
aircraft’s master brightness control, the RTU BRT knob is solely adjusted to
achieve the desired display brightness.
NOTE:
The RTU uses a fluorescent bulb for display
backlighting. The performance of fluorescent bulbs
and LCDs at extremely low temperatures can be
degraded. Within the temperature range of -20°C to
+70°C, operation will be normal after a 4 second
power-up delay. Below -20°C, there will be a power-up
delay of approximately 1 minute for each degree
below -20°C, up to 10 minutes. After the display is ON,
full display brightness may not be available for an
additional 10 minutes.
C. Line Select Keys:
The RTU has seven panel-mounted line select keys surrounding the
display window. These keys are used to select control individual radio
frequencies, presets, codes and modes. The tune window is shown around
the value selected for control.
D. Tuning Window:
The tuning window surrounds (“boxes”) the frequency, preset or code
selected for control. The tuning knobs are then used to change values
shown inside the tuning window. The default position for the tuning window
is around the COM recall (top right) frequency on the top level page.
In some installations, the tuning window automatically returns to the default
position after twenty seconds of inactivity.
E. Tuning Knobs:
Tuning knobs are used to set the value shown in the tune window. When a
frequency, code or mode is shown in the tune window, the large knob
controls the most significant digits and the small knob controls the least
significant digits.
F. Volume Knob:
A volume knob may or may not be present, depending on the installation. If
present, the volume knob is the third (smallest diameter) knob on the
tuning knob cluster. Individual radio volume may be set from a top level
display, described as follows:
(1) The line select key adjacent to the desired radios subdisplay (on the
top level display) is depressed to show the tuning window.
(2) The selected radio’s volume is then set with the volume knob. A
volume scale will be displayed in the recall display after the first click
of the volume knob.
To set a volume level from a radio mode or preset page, the main display
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-23-00
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May 30/02
Revision 7
page or preset page is selected and the volume knob is turned. A volume
scale will be displayed after the first click of the volume knob.
DME Volume: Normally, DME volume is set to the same level as NAV
volume. In installations with independent DME tuning, the DME volume
level may be independently controlled from the NAV main display page
when the DME Hold (DME-H) function key is depressed. The process is
　
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