Operation Manual Part 2

Aerosoft – Digital Aviation
CRJ-70 & CRJ-900
AOM PART 2
Systems Description
VOL
5
5-1-97
26-Jul-2017
GLOBAL POSITIONING SYSTEM (GPS)
The global positioning system works according the same principle as smartphones or handheld GPS-units – the
unit receives satellite signals to compute the current positions, altitude and velocity. The main difference
between the CRJs GPS and a handheld device is the accuracy of the GPS signals and hence the aircrafts position
as well as redundancy.
The CRJ has two independent antennas and receivers which have an interface to the integrated avionics
processor system (IAPS). The IAPS connects data from the FMS, the inertial reference systems and other
navigation sources to provide navigation, position information and guidance.
GPS data may be considered via opening the respective FMS pages on the control display unit.
VHF NAVIGATION
Two VHF navigation systems NAV 1 and NAV 2 are available on the CRJ. Both provide receiving and processing
of the following signals
• VOR stations
• Localizer (LOS) / glideslope (GS) / ILS stations
• Marker beacon (MB)
The radio tuning unit is the primary device to tune navigation or communication frequencies. Nevertheless,
there is a backup tuning unit to tune NAV 1 and 2:
Bild und Kontrollen Backup Tuning unit
The VOR/LOC receivers operate in the following ranges:
• VOR frequencies all even frequencies from 108.00 to 111.90 MHz and all frequencies from 112.00 to
117.95 MHz.
• LOC frequencies all odd frequencies from 108.10 to 111.95 MHz
The received data is displayed on the pilot and copilots PFD and MFD depending on the selected modes.
In case an ILS is tuned horizontal and glideslope information are displayed accordingly.
The marker beacons provide information on the distance to runway threshold by aural signals and visual cues
on the PFD and MFD.
VOR/LOC stations may be identified by aural designators when selected accordingly on the audio’s integrated
system.