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described as follows:
(3) The line select key adjacent to the DME hold frequency is
depressed, resulting in the tuning window surrounding the DME
frequency.
(4) The DME volume is then set with the volume knob. A volume scale
will be displayed after the first click of the volume knob.
G. DME Hold (DME-H) Function Key:
The DME-H function key is used to hold the currently tuned DME
frequency. When DME hold is active, the DME hold frequency is shown in
green followed by a yellow “H” on the top level page, NAV main display
page and preset page.
H. IDENT Function Key:
The IDENT function key is used to transmit an ATC identification pulse.
When the IDENT feature is active, “ID” is annunciated in cyan on the ATC
subdisplay and on the ATC main display page.
I. 1 / 2 (Cross-side Tuning) Function Key:
To select control of the cross-side system, the 1 / 2 function key on the
on-side RTU is depressed. When selected, cross-side labels are shown in
yellow. When both RTUs attempt to command the same system
simultaneously, the pilot’s RTU takes precedence.
If an RTU had failed, selection of the 1 / 2 function key shows the Crossside
Radio Tuning Inoperative page. This page can be cleared by again
depressing the 1 / 2 function key or any line select key. To tune the crossside
systems with a failed RTU (reversionary tuning mode), the failed RTU
must first be shut off.
NOTE:
Cross-side tuning removes the associated preset from
the active display.
J. 8.33 kHz Channel Spacing:
The ability to select between 25 kHz and 8.33 kHz tuning is found on the
first top level page for VHF COMM tuning. This page is accessed by
depressing the 1L line select key, adjacent to the active frequency. The top
level page then displays the option of selecting 25 kHz or 8.33 kHz tuning
using the 1R line select key. The active choice is displayed in large font,
cyan in color. Continuing to depress the 1R line select key toggles between
the choices. After the choice is made, the RETURN prompt adjacent to the
4L line select key is depressed. Note that when 25 kHz spacing is selected,
a “25” icon is present under the preset frequency position at line select key
1R. When 8.33 kHz spacing is selected, there is no icon displayed.
With 8.33 kHz spacing selected for tuning and an 8.33 kHz frequency
OPERATING MANUAL
2A-23-00 PRODUCTION AIRCRAFT SYSTEMS
Page 32
May 30/02
Revision 7
tuned, the actual frequency is not displayed. Rather, a “channel” or “code”
is displayed that coincides with the frequency change as received from
ATC. An example of actual frequency versus displayed frequency is shown
on the table that follows.
Because of the nature of the bandwidth differences between 25 kHz
spacing and 8.33 kHz spacing, ATC may assign a frequency channel for a
25 kHz frquency when 8.33 kHz is selected for tuning. The result is that the
displayed frequency may differ slightly from the actual frequency, e.g., the
displayed frequencies of either 132.000 and 132.005 result in the same
actual frequency of 132.0000. See the following table:
8.33 kHz SPACING: COLLINS RTU-4200 SERIES RADIO TUNING UNIT
Actual Frequency Tuning Spacing Displayed Frequency
132.0000 25 or 8.33 132.000 or 132.005
132.0083 8.33 132.010
132.0166 8.33 132.015
132.0250 25 or 8.33 132.025 or 132.030
132.0333 8.33 132.035
132.0416 8.33 132.040
132.0500 25 or 8.33 132.050 or 132.055
132.0583 8.33 132.060
132.0666 8.33 132.065
132.0750 25 or 8.33 132.075 or 132.080
K. RTU Color Convention:
The RTU uses a color Liquid Crystal Display (LCD) to display data. For the
purposes of this discussion, the RTU can be classified into two groups:
those with white on-side and single system labels, and those with green
on-side and single system labels. Thus, RTU color convention is shown in
the following table:
DISPLAY PARAMETER
ON-SIDE / SINGLE
SYSTEM LABEL
COLOR
WHITE GREEN
On-side and Single System Labels White Green
Cross-side System Labels Yellow
Active Frequency / Channel / Code Data Green
Active ATC Code - Standby Selected White
Unverified Frequency / Channel / Code Data Magenta Cyan
Dashed Unverified Frequency / Channel / Code Data White
Recall Freq / Channel / Code / Preset Data White Cyan
Active Mode Control Selections Cyan
DME Hold (H) Annunciator Yellow
ATC Reply (RPLY) Annunciator Cyan Green
Transponder Fail (XPDR FAIL) Annunciator Yellow
No Remote Tuning (NO RMT TUNE) Annunciator Cyan Yellow
CTL standby (STBY) Annunciator Yellow
OPERATING MANUAL
　
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