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Each window groups the data associated with a particular function.
The windows (COM, NAV, ATC/TCAS, ADF, and TCAS DSPY) each
provide for control of both frequency and operational mode of the associated
function. The RMU also has other display modes, called pages,
which provide additional features and functions for the control of the
radio system. The PGE function at the bottom of the RMU is used to access
additional RMU pages. RMU display brightness is adjustable using
the tuning knob after the DIM function key is depressed. To return
the tuning knob to normal operation select any other key.
RADIO MANAGEMENT UNIT
Figure 5-15
Pilot’s Manual
5-52 PM-132A
RMUs each have a primary and a secondary power source. If the primary
source is not available, the RMU will automatically switch to the
secondary power source. RMU #1 primary is powered from the left
essential bus, and RMU #1 secondary is powered from EMER BATT
bus. RMU #2 primary is powered from right main avionics bus and the
secondary from the right essential bus. RMU #1 and RMU #2 primary
and secondary circuit breakers are located in the COMMUNICATIONS
group on the pilot’s and copilot’s circuit breaker panels. RMU #2
primary is the only power source affected by the avionics master.
RMU CROSS-SIDE OPERATION
Should the pilot decide to tune the copilot’s set of radios, he can push
the 1/2 function key and transfer his entire RMU display and operation
to the copilot’s #2 system. Both RMU displays will be identical;
however the pilot’s RMU will show the function legends on the main
tuning and memory pages in magenta to indicate that cross-control is
being exercised. In addition to having access to the #2 system, the pilot
still has the memory frequencies in their #1 RMU available for recall for
use with the #2 system. Both pilots have this control transfer function
available. It provides flexibility in crew coordinated tuning as well as a
backup mode in the event one RMU becomes inoperative. The pilot
may change any frequency or mode on the copilot’s system using the
pilot side RMU. Any changed frequency is annunciated in yellow on
the copilot’s RMU. The frequency will be white on the pilot’s RMU. If
the pilot should push the 1/2 key again, the pilot’s side RMU will
revert to the original display.
RMU BACKUP PAGES
Either RMU can provide two pages of backup engine and systems indication
and one page for a backup navigation display. These backup displays
can be selected on the PAGE MENU page of either RMU. The
backup engine and systems pages can be selected by depressing the
line select key adjacent to “ENGINE PG1” or “ENGINE PG2” on the
PAGE MENU page. The backup navigation display is accessed by depressing
the line select key adjacent to “NAVIGATION” on the PAGE
MENU page.
The ENGINE PG1 and ENGINE PG2 contain information such as: ITT,
O/P (oil pressure, left and right), FUEL, HYDM-B (hydraulic pressure),
N1, N2, OIL ° C, FF PPH (fuel flow pounds per hour), VOLTS,
EMER VOLTS, AMPS, OXY, SAT (oxygen quantity and static air temp),
TRIM-PIT, AIL, and RUD (pitch, aileron and rudder trim).
Pilot’s Manual
PM-132A 5-53
The NAVIGATION page provides the following data, when valid data
is available: NAV, ADF, CRS (selected course), DME (distance to tuned
station), bearing pointers for VOR and ADF, TO/FROM indication,
MARKER BEACONS, HEADING, lateral deviation (VOR and ILS),
and vertical deviation (GS only). The navigation displays on both
RMUs use AHRS#2 heading information and NAV information from
NAV 1 and ADF 1.
VHF COM TUNING
Normal operation of the RMU is with the radio tuning page displayed.
A section for COM is located in the upper left corner. The COM window
displays two frequencies. The top line displays the active frequency
of the COM, while the line below will display the preset frequency.
When pressing the line select key (preset frequency) adjacent to the
lower frequency, a yellow cursor encloses that frequency. This step is
not always necessary since the cursor normally “parks” over the preset
frequency box. Anytime the cursor has been moved to another area on
the main radio tuning page, it will automatically return to the COM
preset frequency after twenty seconds of inactivity on that page. When
the yellow cursor is enclosing the preset frequency, that frequency can
be changed by adjusting the tuning knobs. The preset frequency can
then be changed (flip-flopped) with the active frequency by depressing
the transfer key.
The storage function can be accomplished by pressing the STO (store)
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