BOMBARDIER BD-100-1A10, Operating Manual

Page: 322 / 544

FLIGHT INSTRUMENTS
Volume 2 Flight Crew Operating Manual Sep 13/2004
11-01-16
CSP 100-6
REV 1
ATTITUDE AND HEADING REFERENCE SYSTEM (Cont)
COMPONENTS AND OPERATION
AHRS COMPUTERS
Each AHRS computer has a dual-sensor assembly. Each sensor assembly has four pairs of piezoelectric accelerometer sen-
sors mounted on a rotating wheel. These sensors provide the rate and acceleration data.
The sensor data combined with ADC and heading information is processed by the AHRS computers and transmitted for
use by the adaptive flight displays (AFD), and by the integrated avionics processor system (IAPS), which itself interfaces
with the flight guidance computer (FGC) and flight management system (FMS).
MAGNETIC FLUX DETECTORS
Each of the two magnetic flux detectors senses the earth’s magnetic field and provides corrected heading information to its
respective attitude heading computer.
External compensator units store corrections for any north/south, east/west or misalignment of the flux detectors.
COMPASS CONTROL AND SLEW SWITCHES
There are two COMPASS HEADING switches and SLEW switches located on either side of the main flight instrument
panel. There are two modes of operation, magnetic heading (slaved) mode, and directional gyro (DG or free gyro) mode.
The HEADING switches are used to select the mode.
In the magnetic heading mode, heading computations are slaved to the attitude heading computer and the flux detectors. In
DG mode, magnetic flux detector data is removed. DG mode is not intended for long term heading reference.
In DG mode, the selection of the SLEW switch causes the heading to slew in the selected direction.
ATT/HDG REVERSION SWITCH
The ATT/HDG switch is located on the center pedestal. When NORM is selected, the left PFD and MFD receive data from
AHRS1 and the right PFD and MFD receive data from AHRS2.
When the switch is selected to 1, all displays receive data from AHRS 1 only. An amber AHS1 message is displayed on
both PFDs.
When the switch is selected to 2, all displays receive data from AHRS 2 only. An amber AHS2 message is displayed on
both PFDs.
RUDDER PEDAL
ALTM
BARO
FWD
AFT
HEADING
COMPASS
SLEW
L
R
DG
PUSH
STD
CF
O
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