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S 50 feet to 10 feet -- 5 foot increments
S Below 10 feet -- 1 foot increments.
(9) Vertical Speed Data,
Vertical speed readouts are in 100 fpm or 1,000 fpm increments. A VS flag is
used to indicate loss of vertical speed data from IRS 1.
(10) Navigation Data,
Standard symbology is used to depict navigation systems data:
S Lateral Deviation,
Localizer deviation and excessive deviation are displayed. LOC flags are used
to indicate a localizer failure or miscompare
S DME distance readouts are in 1 nm or 0.1 nm increments
S Selected VOR or LOC indications are provided. Navigation source failure
flags are provided
S Marker beacon indications (OM, MM, IM) are provided
S Vertical Deviation,
Glideslope deviation and excessive deviation indications are provided. GS
angle readouts are provided. GS flags are used to indicate a glideslope
failure or miscompare.
REV 56, Jan 31/03
Vol. 1 12--70--4
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual MASTER
CSP A--013
Effectivity:
S Airplanes equipped with the --503 HGS computer
NOTE
When the navigation source is the FMS, the bearing
pointer will not be displayed on the HUD. The bearing
pointer will only be displayed when the navigation source
is provided by the ADF or VOR.
(11) Symbolic Runway,
During a Category IIIa approach, a runway symbol is displayed from 300 to 60
feet AGL. The runway is scaled (200 feet wide and 10,000 feet long) with tic
marks representing the runway aim point (1,050 feet from the threshold).
(12) Windspeed and Direction,
A windspeed readout (up to 256 knots) and a direction arrow are provided.
(13) Windshear Indications and Guidance,
Windshear indications and guidance data are provided. Primary mode will
automatically pop--up to provide guidance data.
(14) Groundspeed Readout,
Groundspeed indications are provided.
(15) Flare Cue,
The Flare Cue symbol comes on at 60 feet AGL and flashes until removed at 30
feet AGL. Indicates that the flare should be initiated but does not provide any
guidance as to how the flare should be performed. The symbol is provided during
all approaches except IIIa mode.
(16) Flare Command,
The Flare command symbol comes on during a Category IIIa approach and
landing and provides guidance in performing the flare maneuver.
(17) Idle Message,
An IDLE message is provided indicating to the pilot to reduce the airplane’s thrust
to idle for touchdown. The message is displayed when the airspeed exceeds the
correct airspeed (plus a wind factor) based upon the present altitude. If the
airspeed is less than the desired, the message is delayed. The IDLE message,
however, is forced to come on at 5 feet AGL regardless of airspeed.
(18) Approach Warning Message,
During a Category II or IIIa approach, below 500 feet AGL, an approach warning
message is provided if the approach conditions exceed present tolerances or if
any HGS failures are detected.
Vol. 1 12--70--5
REV 56, Jan 31/03
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual
CSP A--013
MASTER
(19) Angle of Attack Limit,
Airplane angle of attack relative to stick shaker is indicated by distance between
the AOA symbol and flight path symbol.
S If AOA and flight path symbol are aligned, then airplane is at stick shaker
S AOA symbol comes on below 1,500 feet if a windshear has been detected
S AOA symbol comes on when the airplane is within 2 degrees of stick shaker.
(20) Flight Director Guidance Cue,
The guidance cue represents lateral and vertical attitude commands required for
the selected low visibility approach and landing:
S During Category I or II operations, displayed until 80 feet AGL, and
S During Category IIIa operations, displayed until touchdown
S An F/D flag is used to indicate flight director failure.
(21) Flight Mode Annunciations,
Lateral armed / captured and vertical mode annunciations are provided. Autopilot
status indications and mistrim indications (aileron, elevator and rudder) are
provided.
(22) Autopilot, Yaw Damper & Mistrim Indications,
A yaw damper message is provided to indicate that the yaw damper is
disengaged. Mistrim flags (elevator, aileron and rudder trims) are provided to
indicate out--of--trim conditions.
NOTE
HGS entry of landing runway elevation is to be made
prior to any type of landing using the HGS.
REV 56, Jan 31/03
Vol. 1 12--70--6
FLIGHT INSTRUMENTS
Head--Up Guidance System
Flight Crew Operating Manual MASTER
CSP A--013
HGS System
Figure 12---70---1
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