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and storage for up to twelve pre-set channels for the VHF COM and
VHF NAV functions. Cross-side operation, maintenance display, power
on self-test and pilot activated self-test and optional FMS radio tuning
features are also available on each RMU. Each RMU also provides
backup engine and navigation display facilities in the event of EFIS/EICAS
failure. Automatic presentation of engine data occurs on RMU #1
if neither IC-600 is providing EICAS data.
There are six line select keys on each side of the RMUs (Figure 5-15).
The top key is referred to as a transfer button and has directional arrows
on them. The remaining keys are referred to as line select keys.
There are also eight function keys located at the bottom of the RMUs.
The RMU main tuning page is divided into six dedicated windows.
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-126A
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 L
essential bus, and RMU #1 secondary is powered from EMER BATT
bus. RMU #2 primary is powered from R main avionics bus and the secondary
from the R 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
back up 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 button 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-126A 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
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