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Flight instruments
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==Flight director systems== {{main|Horizontal situation indicator}} {{main|Attitude indicator#Attitude Direction Indicator}} These include the Horizontal Situation Indicator (HSI) and Attitude Director Indicator (ADI). The HSI combines the magnetic compass with navigation signals and a [[Glide slope]]. The navigation information comes from a [[VHF omnidirectional range|VOR]]/[[Localizer]], or [[GNSS]]. The ADI is an Attitude Indicator with computer-driven steering bars, a task reliever during instrument flight.<ref name=faa/>{{rp|3-22 to 3-23,7-10}}
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