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S Control Panel,
The control panel is used to set system references, flight and system test modes.
S Overhead Unit,
The overhead unit contains a CRT to generate symbology and a lens to project the
symbology on the combiner.
S Drive Electronics Unit,
The drive electronics unit contains the CRT drive circuitry and power supplies.
S Computer Unit,
The computer unit creates the flight symbology from airplane sensor data. HGS combines
airplane situational information (speed, heading, pitch, roll, attitude), inertially sensed
flight path and flight path acceleration information and guidance directed control inputs.
Integration of airplane systems information and inputs, combined with flight data, allows
the pilot to maneuver the airplane along the flight path with precise straight--in and glide
path tracking.
If guidance data is being provided by AFCS, the combiner will echo AFCS data. During a
HGS--guided approach, once the localizer and glideslope have been captured and the
airplane has descended below 2,000 feet, the HGS can be selected to provide the desired
type of approach guidance.
HGS modes are as follows:
S Primary (PRI) Mode,
PRI mode can be used for take--off, cruise and landing.
S Flight Director (F/D) Mode,
F/D mode can be used to fly F/D--generated approach guidance or to monitor a coupled
approach.
S Visual Meteorological Conditions (VMC) Mode,
VMC mode is used for visual approaches and landings without guidance.
REV 56, Jan 31/03
Vol. 1 12--70--2
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual MASTER
CSP A--013
S Modes AI and AII,
These modes are used to manually fly precision approaches.
S Mode AIII,
This mode is used for approach and landings to category IIIa minima.
NOTE
The provision of data for Low Visibility Take--offs, or
Category II Operations or Category IIIa Operations
does not constitute operational approval to conduct
such operations.
S Clear (CLR) Mode,
Clear mode is typically used during taxi to clear all symbology from the combiner.
S Test (TEST) Mode,
Test mode is used by maintenance staff to diagnose faults, checkout and troubleshoot
the system.
A. Combiner Symbology
Dependent upon HGS mode (see “DISPLAY CRITERIA” table) the combiner will display
the following:
(1) Align HGS Message,
An ALIGN HUD message is displayed to indicate a combiner alignment problem.
(2) Boresight Symbol,
Pitch and roll data are referenced to the boresight symbol.
(3) Attitude Data,
Standard symbology is used for pitch and roll scales, pitch and roll indicator, slip /
skid indicators. Pitch bars may be compressed. Extreme pitch attitude symbols
(up / down pointing chevrons) are also used. Flags are used to indicate IRS
source failures and IRS data miscompare.
(4) Heading Data,
A horizon line with a heading scale, index and heading readout and selected
course data is provided. A 200--degree compass card is displayed during primary
mode. Flags are used to indicate IRS source failures and heading data
miscompare.
(5) Flight Path Data,
A flight path symbol indicates the airplane’s lateral and vertical flight path. The
flight path symbol will mask (blank) other data. An acceleration symbol is also
provided.
Vol. 1 12--70--3
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual
CSP A--013
MASTER
(6) Airspeed Data,
Standard symbology is provided for the airspeed indications; airspeed scale and
tape, speed bugs, trend vectors and for the setting of V--speeds. An airspeed
error symbol is provided that indicates a deviation (+/-- 15 KIAS) from the
selected airspeed. Checkerboard symbols are used as overspeed / low speed
cues. The Mach readout comes on when Mach is greater than 0.45. Flags are
used to indicate IAS and ADC failures and miscompares.
(7) Baro Altimeter Data,
Standard symbology is provided for the barometric altitude indications; altitude
tape, altitude readout and altitude preselect. Barometric prerssure setting
indications are not provided. MDA alert and readout data are provided. Display
of metric altimeter data or preselects is not provided. Flags are used to indicate
ALT failures.
(8) Radio Altimeter Data,
The selected decision height readout is displayed and decision height alerting is
provided. Flags are used to indicate RA failures and miscompares are detected
below 1,000 feet AGL. Radio altitude readouts are as follows:
S 2,500 feet to 1,000 feet -- 50 foot increments
S 1,000 feet to 50 feet -- 10 foot increments
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