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Heads-Up Display Modes 35 - Metaboli

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30 <strong>Heads</strong>-<strong>Up</strong> <strong>Display</strong> <strong>Modes</strong><br />

HEADS-UP DISPLAY MODES<br />

3.1. F-15C Eagle HUD <strong>Modes</strong><br />

3.101 Basic HUD Symbology<br />

Several indicators on the F-15C HUD are common to all HUD modes.<br />

Basic HUD Symbology<br />

• The Aircraft symbol, similar to the letter “W,” appears exactly in the center of<br />

the HUD and indicates where the aircraft’s nose is pointing.<br />

• The heading scale appears along the top edge, displaying the heading<br />

rounded to the nearest ten (for example, 270 appears as 27).<br />

• The airspeed scale on the left edge shows the Indicated Airspeed (IAS) in<br />

knots. The airspeed scale does not display values below 150 knots.<br />

• The altitude scale on the right edge shows the aircraft’s altitude above sea<br />

level (MSL) in feet.<br />

• The velocity vector moves through the middle of the HUD, showing the<br />

direction the aircraft is actually moving, which varies from where the aircraft is<br />

heading because of momentum, sideslip, angle of attack, etc.<br />

• The pitch scale appears in the middle of the HUD, centered on the velocity<br />

vector. Primarily, it shows the aircraft’s pitch measured in five-degree<br />

increments. The entire scale moves left and right, however, mirroring the turnand-slip<br />

indicator on the ADI. As with the turn-and-slip indicator, to stop<br />

sideslip, apply rudder toward the scale.<br />

3.102 Navigation Mode<br />

As the name implies, navigation mode provides navigation and steering cues.<br />

Basic navigation mode points the way to the next steer point within the<br />

programmed route. ILS mode, on the other hand, provides information required<br />

during landings.

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