Attitude And Heading Reference Unit; Ahrs Control And Eicas Annunciation - Honeywell PRIMUS 1000 Pilot's Manual

Integrated avionics system for embraer 145
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PRIMUSr1000 Integrated Avionics System

ATTITUDE AND HEADING REFERENCE UNIT

The AHRU is the main electronics assembly of the AHRS. It contains
an inertial sensor assembly that includes the fiber optic gyros and
accelerometers. These measure accelerations and angular rates of the
aircraft.
The AHRU microprocessors compute the data required for flight
control, and display functions through digital bus interconnect. In
addition, an externally mounted memory module stores the flux valve
compensation data and aircraft AHRU orientation data.
The power supplies receive dual input dc power from the aircraft. The
AHRU supplies 26 Vac for the flux valve. True airspeed (TAS)
information is supplied by the MADCs.
The system can be tested and has troubleshooting functions that are
maintenance interconnect.

AHRS CONTROL AND EICAS ANNUNCIATION

AHRS Controls
AHRS controls shown in figure A--2, are located on the instrument
panel, adjacent to the reversionary panel.
AHRS
DG
CW
SLVD
CCW
AD--51726@
AHRS Controls
Figure A--2
A28--1146--112--00
AHZ--800 Attitude and Heading Reference System (AHRS)
A--5

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