NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-75
Page
2
Code
01
REVISION 39
AOM-145/1114
The HGS interfaces with the following airplane systems and
equipment:
− Inertial Reference System (IRS 1) for primary attitudes,
heading, body acceleration, body rates, vertical speed and
ground speed;
− Attitude and Heading Reference System (AHRS 2) or IRS 2 for
comparison with IRS 1 data;
− One or two Global Positioning Systems (GPS) for ground speed
and true track data;
− Two Air Data Computers (ADC) for barometric altitude and
airspeed data;
− Two VHF/NAV receivers for ILS data plus a third (ILS 3) to
serve as a monitor;
− Two Radar Altimeters (RA) for altitude above ground data and
decision height selection;
− Flight Guidance System (FGS) for Flight Director command
signals from the Honeywell PRIMUS 1000 system;
− FGS Control Panel for selected course, heading, airspeed,
vertical speed and altitude settings;
− Distance Measurement Equipment (DME) for distance from
station data;
− One or two Automatic Direction Finding (ADF) sensors for
bearing to station;
− Traffic Alert and Collision Avoidance System (TCAS) for
resolution advisory data;
− Ground Proximity Warning System (GPWS or EGPWS) for
windshear and terrain warning data;
− One or two Flight Management Systems (FMS) for LNAV and
VNAV data;
− Stall Protection Computer (SPC) for AOA data.
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