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SYMBOL FUNCTION
63
Negative three degree Indicates the negative 3 degree position on the pitch ladder.
marks
0
Barometric pressure The barometric pressure setting used by the dlsplay system and the
setting weapon system is the value set on the pilot’s barometric altimeter. The
setting will be displayed for up to 5 seconds on the HUD and VDI in the
TLN mode when the setting is changed. At 18,000 feet, tf it Is off, the
symbol comes on and blinks for 5 seconds.
0
Bank scale Provides indication of bank angle to f45’. Tick marks are provided at O”,
*IO”, f20”, .f30” (slightly larger) and f45”.
The warnings L STALL, R STALL, L FIRE, R FIRE, and RDC SPEED and the
CLSN advisory will appear on the HUD in the steady condition. Up to two
indications may be displayed at any one time. When more than two
indications are present, they scroll up from the bottom at the rate of one
per second.
63
Bank angle pointer Moving pointer provides indication of aircraft bank angle. At bank angles in
excess of f45O, the pointer will be pegged at f50” and will flash.
0
Peak aircraft g Peak Aircraft g is displayed on the HUD as follows:
TLN Gear Down: If aircraft g falls below +O.O or exceeds +2.0.
TLN Gear Up, A/A, A/G: If aircraft g falls below -2.0 or exceeds +4.5.
Peak g indication is displayed until a declutter mode is cycled.
@ Aircraftg
0
Mach number
63
Angle-of-attack
Aircraft g is displayed on the HUD as follows;
TLN Gear Down: If aircraft g falls below +0.5 or exceeds +I .5.
TLN Gear Up, A/A, A/G: If aircraft g falls below -2.0 or exceeds +4.5.
Indicates speed of the aircraft in math.
Indicates angle-of-attack in units.
Note
When’the TLN gear down format is displayed, the AOA readout is
removed when AOA is between 14 and 16 units. If AOA is greater
than 14 units and decreasing, the readout remains off until AOA
decreases below 13 units. If AOA is less than 16 units and
increasing, the readout remains off until AOA increases above 17
units.
@ Airspeed dial The HUD analog airspeed dial consists of ten dots encircling the airspeed
readout. Each dot indicates airspeed in tens of knots with the zero mark
located at the top center of the dial.
@ Airspeed pointer An analog pointer indicating airspeed moves uniformly around the inside of
the airspeed dial based on indicated airspeed. Increasing airspeed is
indicated by clockwise rotation of the pointer.
0
Extended horizon line Represents the horizon with respect to the aircraft and changes orientation
with any change in aircraft pitch or roll.
Figure Z-92. HUD TLN Basic Format (Sheet 3 of 4)
2-169 ORIGINAL
@ Digital airspeed readout Provides digital readout of calibrated airspeed.
@ Flight path marker The flight path marker is displaced in azimuth and elevation to present
computed flight path. Aircraft vertical flight path angle is indicated by the
position of the flight path marker on the pitch/flight path ladder. In the
caged mode, the flight path marker is caged in azimuth and the true flight
path marker position is indicated by the display of the ghost flight path
marker when the true position is more than 2” from the caged position.
The flight path marker can be caged or uncaged by alternately pressing
the CAGE/SEAM switch. On selection of TLN or A/A, the flight path marker
IS mittally caged: selection of AIG presents the uncaged mode initially.
024 Heading Scale Aircraft magnetic heading is indicated by the moving 360” heading scale.
In TLN, the major divisions are numbered every 10 degrees. In A/A, the
major divisions are numbered every 20 degrees.
Note
When the aircraft is in the TLN mode with the gear handle down,
the heading scale remains 2 degrees above the position of the
flight path marker. The lowest point of the heading scale, including
the numbers, will never rise above the normal (gear up) position.
The heading scale is occluded by the altitude and airspeed dials
and readouts.
3 Angle-of-attack
bracket
The AOA bracket is a pitch related variable that indicates the deviation of
the current AOA from a desired value and is vertically referenced to the left
wing of the flight path marker symbol. The center of the bracket represents
the optimum AOA. The bracket moves lower with respect to the flight path
marker as AOA increases and it moves higher as AOA decreases.
@
Potential flight path Indicates the acceleration along the flight path marker. Provides a
marker graphical representation of the ability to change the flight path angle by
varying the thrust acceleration and/or angle of attack. Deceleration is
　
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