Operation Manual Part 2

Aerosoft – Digital Aviation

CRJ-70 & CRJ-900

AOM PART 2

Systems Description

VOL

5-1-23

26-Jul-2017

INTERPHONE AND INTERCOM CONTROL PANEL

The interphone panel on the centre pedestal is part of the ground crew

interphone. The ground crew interphone is used to establish

communication between crew in- and outside of the aircraft (like during

pushback, engine start, aircraft maintenance). Hence there are several

panels in and outside the aircraft to establish communication. The interphone panel on the pedestal is the only

one modelled and as the counterparts are missing as outside crew there is no function associated with the

ground crew call button which is normally used to establish communication to an outside crew.

The intercom control panel is used for in-airplane-

communication and it faces similar limitations like the

interphone panel. It is not simulated, on the real plane, it offers

four modes of communication:

• PA: Used to address passengers – turns green when activated / pushed

• CHIME: Sounds a chime in the cabin

• CALL: Sounds a chime in the cabin and enables intercom to the flight attendants – turns green when

activated / pushed

• EMER: Used for emergency calls from the flight deck to the flight attendants – flashed in amber when

activated / pushed

RADIO TUNING UNIT (RTU)

Two VHF (very high frequency) communication systems provide AM (amplitude modulation) voice

communication with ground stations and other aircraft. They operate in a range from 118.000 to 136.975 MHz

They are tuned by via the radio tuning units in normal operation and in case both RTUs fail a backup tuning

unit provides tuning for communication system 1.

The radio tuning units, RTU, are associated with the side they are installed on. Hence the left RTU controls

COM 1 and NAV 1 and the right RTU controls COM 2 and NAV 2.

1. FREQUENCY READOUT: The current active frequency is shown in green

2. SELECT KEY: Push once to directly tune the active frequency, push twice to open COM main page

3. TUNING WINDOW: The while box indicates the frequency that can be adjusted