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Heads-Up Display Modes 35 - Metaboli

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12 Aircraft Cockpits<br />

2.203 Airspeed Indicator<br />

Located just below the RWR scope, the airspeed<br />

indicator shows Calibrated Airspeed (CAS) from 50 to<br />

500 knots, and reads within 4 knots of the airspeed<br />

displayed on the HUD. The striped needle moves to<br />

show the limiting structural airspeed.<br />

Airspeed / Mach Indicator<br />

AOA Indicator<br />

2.204 AOA Indicator<br />

Located to the left of the Airspeed Indicator, the AOA<br />

indicator displays the current Angle Of Attack in units from<br />

zero to 30. The units are calibrated against the A-10A’s normal<br />

flight envelope – a single unit does not equate to a single<br />

degree of pitch. An index mark is set at the approximate<br />

optimum landing approach AOA (20 units).<br />

2.205 AOA Indexer<br />

The AOA indexer sits on the canopy railing just left of the<br />

HUD. It displays three indicators comparing the current<br />

AOA with the proper landing approach AOA. When the top<br />

light illuminates, the AOA is either too high or the airspeed<br />

AOA Indexer<br />

is too slow. When the bottom light illuminates, the AOA is<br />

either too low or the airspeed is too high. When the center light illuminates, the<br />

aircraft is maintaining the correct landing AOA. Slight errors are indicated when<br />

the center light illuminates in conjunction with one other light.<br />

2.206 Attitude Director Indicator<br />

(ADI)<br />

The Attitude Director Indicator (ADI) dominates<br />

the center of the instrument panel. The rolling<br />

attitude sphere displays the aircraft’s pitch and<br />

bank angles. Pitch markings are graduated in 5-<br />

degree increments. The bank markings are<br />

graduated in 10-degree increments. During<br />

Instrument Landing System (ILS) approaches, the<br />

The ADI<br />

ILS bank steering (localizer) and glideslope bars<br />

appear in front of the attitude sphere. During ILS landings, fly toward the ILS<br />

needles.<br />

The turn-and-slip indicator resides at the bottom of the instrument. When not<br />

centered, apply rudder toward the needle to center the indicator.

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