AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 39
2-18-75
Page
7
Code
01
AOM-145/1114
HGS MODES OF OPERATION
The HGS has four operational modes: Primary (PRI), Instrument
Meteorological Conditions (IMC), Visual Meteorological Conditions
(VMC) and AIII approach (used for CAT IIIa operations).
These modes can be selected at any time with the exception of AIII
which is available only after ILS capture.
PRIMARY MODE
The HGS Primary (PRI) mode can be used during all flight phases,
from takeoff to landing. This mode allows low-visibility takeoff
operations, all enroute operations, and approaches to CAT I or II
minimums using FGS Flight Director guidance.
The HGS Primary mode display is very similar to the Primary Flight
Display (PFD) thus easing the Pilot’s transition from flying under head-
down instruments condition to head-up flying. The Primary mode
display includes the following symbolic information:
− Airplane Reference (boresight) symbol;
− Pitch - scale and horizon relative to boresight;
− Roll - scale and horizon relative to boresight;
− Heading - horizon, HSI and digital heading display;
− Speeds - CAS (tape), vertical speed, ground speed, speed error
tape;
− Altitudes - barometric altitude (tape), digital radio altitude;
− Flight Path (inertial);
− Flight Path acceleration;
− Slip/Skid Indicators;
− FGS Flight Director (F/D) guidance cue and modes;
− Flight Director armed and capture modes;
− Navigation data - ILS, VOR, DME, FMS, marker beacons;
− Wind - speed and direction;
− Selected parameters - course, heading, airspeed and altitude;
− Miscompare Annunciations and Failure Flags.
When the airplane is on the ground, several symbols are removed or
replaced in order to provide guidance for the Low Visibility Takeoff.
After takeoff rotation has been reached, the full, in-flight set of symbols
is restored.
The Primary mode can be selected at the HCP or by pressing the
throttle go-around button during any mode of operation.
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