Radio Management Units (Rmus); Radio Management Unit (Figure 5-15) - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual

RADIO MANAGEMENT UNITS (RMUs)

The two RM-855B Radio Management Units (RMUs) provide the cen-
tral controlling functions for the entire basic radio system. Each RMU
is a color, active matrix, Liquid Crystal Display (LCD) based unit. The
primary function of each RMU is to select and control the frequencies
and operational modes of each radio. Each RMU also provides access
and storage for up to twelve pre-set channels for the VHF COM and
VHF NAV functions. Cross-side operation, maintenance display, pow-
er on self-test and pilot activated self-test and optional FMS radio tun-
ing features are also available on each RMU. Each RMU also provides
backup engine and navigation display facilities in the event of EFIS/EI-
CAS 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 ar-
rows 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 as-
sociated 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 ac-
cess additional RMU pages. RMU display brightness is adjustable us-
ing 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
5-51
PM-132A