Embraer EMB145, Operation Manual

Page: 2259 / 2662

AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 33
2-18-11
Page
1
Code
01
RADIO MANAGEMENT UNIT (RMU)
The Radio Management Unit consists of a display and a bezel panel
that provide control of the communications and radio navigation
equipment. Additional airplane systems information is also available on
specific RMU selectable pages.
The EMB-145 is equipped with two RMUs, each one responsible for
controlling the on-side radio equipment (e.g., RMU 1 controls the
NAV/COM 1). However, through the cross-side operating mode, it is
possible to select the opposite side radio frequencies.
There is no master switch for the RMUs: when the airplane is
energized, both RMUs (and the EICAS) are automatically turned ON.
However, only the COM 1 radio is available (dashes on the remaining
RMUs fields) until the AVIONICS MASTER is switched ON.
Additionally, in the event of an electrical emergency, the RMU is a
backup display for the main panel (PFDs and MFDs). In this condition
the main panel is turned off and the NAVIGATION Backup Page, which
presents basic navigation information, may be accessed through RMU
page.
RMU PAGES
Available RMU pages are as follows: RADIO Page, NAV and COM
Pages, ATC/TCAS Control Page, NAVIGATION Backup Page,
ENGINE Backup Pages 1 and 2, SYS SELECT Page (COM band
options) and MAINTENANCE Page. For airplanes equipped with
KHF-1050, HF MEMORY Page and HF Control Page are also
available.
Pressing the Page Control Button (PGE) selects the Page Menu.
Pressing the Line Select Button associated with the desired page will
cause the respective page to be displayed. The RADIO Page will be
displayed again when the Line Select Button associated with the
RETURN TO RADIOS label is pressed.
RADIO PAGE
Normally presented after power up, the RADIO Page is divided into five
dedicated windows. Each window groups the data associated with a
particular function: COM, NAV, ATC/TCAS, ADF. HF and MLS may
also be available. In addition, the windows provide complete control of
the frequency and operating modes of the associated function.