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-Traffic alert and collision avoidance system (TCAS)
-Stall protection system
The AHRS consists of two computers, two flux detector units and two external compensator units. Both Attitude Heading Reference Systems are active permanently. AHRS mode selections are carried out through the COMPASS HEADING and COMPASS SLEW switches. The AHRS normally operates in magnetic mode (MAG). Directional gyro mode (DG) may be selected in areas where magnetic field disruptions exist.
The AHS-3000/3000A system is not designed for use as a polar navigator. Flying in or around the fringe of low magnetic flux areas can cause temporary dropouts in required flux levels for the system to operate properly.
Initialization and operation of the AHRS occurs automatically when electrical power is established and the aircraft is sta-tionary. Initialization takes approximately 40 seconds in MAG mode and 4.5 minutes in DG mode.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
11-01-15 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.
CFO1101002_026
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.
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