Radio Altimeter System; Primus  Ii Integrated Radio System - Honeywell PRIMUS 1000 Pilot's Manual

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
PRIMUS II Radio System) consists of the following components:
â
Integrated Navigation Unit
D
Integrated Communication Unit
D
Radio Management Unit (RMU)
D
Audio Panel
D
Tuning Backup Control Head.
D
â
The PRIMUS 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
System, of this manual. For a more complete description of the
PRIMUS II Radio System, refer to Honeywell Pub. No. 28--1146--050.
â

RADIO ALTIMETER SYSTEM

The radio altimeter system includes the following components:
One Radio Altimeter Receiver Transmitter
D
Two Embraer--Supplied Antennas (Sensor Systems).
D
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.
A28--1146--112--00
II Integrated Radio System (also known as the
PRIMUSr1000 Integrated Avionics System
II Radio
â
System Description
2-7