Selected Altitude (NP, AI, AII, AIII)
Displays the altitude set in the MCP altitude window.
A selected altitude box shows 900 feet before reaching the selected altitude. At
200 feet from selected altitude, the selected altitude box no longer shows.
Altitude Trend Vector (NP, AI, AII, AIII)
Tip of arrow indicates predicted altitude in the next 12 seconds based on the current vertical speed.
Selected Altitude Bug (NP, AI, AII, AIII)
Points to the altitude set in the MCP altitude window.
When the selected altitude is off scale, the bug is parked at the top or bottom of
the tape, with only one half bug visible.
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Altitude Awareness Bug (NP, AI, AII, AIII)
Displays when altitude hold or altitude acquire is active, and airplane is 100 or more feet off selected altitude. The bug is referenced to the pitch scale, with one degree of pitch representing 100 feet of altitude.
Minimums Reference/Altitude (all modes)
Displays approach minimum reference and altitude set by the MINS selector on the EFIS control panel.
Landing Altitude Reference Bar (NP, AI, AII, AIII)
Displays height above touchdown:
.
solid bar - 500 to 1000 feet above landing altitude
.
dashed bar - 0 to 500 feet above landing altitude.
Current Altitude (NP, AI, AII, AIII)
Displays current altitude in increments of thousands, hundreds and twenty feet.
For positive values of altitude below 10,000 feet, an “X” symbol is displayed.
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Approach/Declutter Mode Displays
Refer to section 42 for symbology descriptions.
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Active HUD Mode Glideslope Reference Line Radio Altitude Wind Indications Lateral Deviation Line Selected Airspeed Runway Edge Lines Digital Airspeed Digital Barometric Altitude
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Unusual Attitude Display
4 2
5
12.3
2600 200
220
UP
2400
1 1
2 60
171 22 40
5
0 20
140 2200
120
3
6
UNUSUAL ATTITUDE
8
240
220
2400
7
UP
809 60188 21
1
407 80
2000
5
140
160
1800
UNUSUAL ATTITUDE (BANK ANGLE > 90o)
Unusual Attitude Display
Automatically displayed when pitch exceeds -20°/+30° or roll exceeds 55°.
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Pitch Scale
Displayed compressed and non-conformal.
Section Lines
Lines converge at the horizon to indicate the ground.
Zenith Symbol
Displayed at +90° of pitch. The longest section of the symbol points toward the horizon.
Airplane Reference Symbol
Displayed 50 percent larger than normal.
Pitch Limit Indicator
Displayed whenever the airplane’s angle of attack approaches stick shaker.
Unusual Attitude (bank angle > 90°)
Displayed when pitch exceeds 90°. The angle of attack indicator, pitch limit indicator and flight path vector are removed from the display until bank angle is reduced to less than 90°.
Nadir Symbol
Displayed at -90° of pitch. The line portion of the symbol points to the horizon.
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Failure Indications and Flags
Failure flags replace symbols or failure messages are displayed, as appropriate.
HUD System Failure Indications and Flags
See section 42 for detailed information on the HUD system failure indications and flags.
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