Aircraft Systems
NAVIGATION INSTRUMENTS
AL250 Flight Manual
MEP
The heading select knob positions the compass card in order to find the heading to the
selected VOR beacon or to find the runway axis (selected ILS) relative to the central
vertical needle.
The lateral deviation indicator is driven by the NAV 2 receive r and indicates VOR or
localizer deviation.
The glideslope deviation indicator is driven by the glideslope receiver (NAV 2), and
indicates the aircraft position relative to the selected glideslope path. The pointer will
be centered when the aircraft is on the glidepath beam, deflected up when the aircraft
is below, and down when the aircraft is above the glidepath beam.
The TO/FROM indicator is driven by the NAV 2 receiver and indicates whether the
aircraft is flying to or from a selected VOR station. It is represented on the instrument
as a white triangle pointing up or down.
The maximum deflection of the needle will be 10° on both sides in VOR mode. In ILS
mode the maximum deflection of the needle will be 2.5° on both sides for the localizer
indication and 0.5° for the glide.
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