PRIMUS
r
1000 Integrated Avionics System
A28--1146--112--00
2-7
System Description
A digital computer in the AHRU mathematically integrates the rate data
to obtain magnetic heading and pitch and roll attitude. The thin flux
valve and accelerometers in the AHRU provide long--term references
for the system.
A memory module, attached to the AHRU assembly, retains flux valve
compensation and configuration information. The panel--mounted
heading/free switches are used to select the heading or DG submodes.
An operational description is given in Appendix A, Attitude and Heading
Reference System (AHRS), of this manual.
PRIMUS
â
II INTEGRATED RADIO SYSTEM
The PRIMUS
â
II Integrated Radio System (also known as the
PRIMUS
â
II Radio System) consists of the following components:
D
Integrated Navigation Unit
D
Integrated Communication Unit
D
Radio Management Unit (RMU)
D
Audio Panel
D
Tuning Backup Control Head.
The PRIMUS
â
II Radio System is the source for VHF communication,
VOR/ILS/DME/marker beacon/ADF navigation data and air traffic
control (ATC) transponder functions. The units are connected through
the RSB that is a high speed, two--way data exchanger. The audio
signals are transmitted from the remote units to the audio panel through
a dedicated data bus.
The system is briefly described in Appendix C, PRIMUS
â
II Radio
System, of this manual. For a more complete description of the
PRIMUS
â
II Radio System, refer to Honeywell Pub. No. 28--1146--050.
RADIO ALTIMETER SYSTEM
The radio altimeter system includes the following components:
D
One Radio Altimeter Receiver Transmitter
D
Two Embraer--Supplied Antennas (Sensor Systems).
The radio altimeter system gives an absolute altitude display from 0 to
2500 feet, failure annunciation, and internal self--test. It also provides
inputs for gain programming for ILS approaches and other mode logic
in the FGS.
