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AL50/MPG5
Chapter 8. OPERATION OF THE SIMULATED AIRCRAFT’S SYSTEMS
8-6. NAVIGATION INSTRUMENTS
8-6-5
OBI
There are two omni bearing indicators installed.
The first one is located just above the control wheel.
Figure 8.26: First OBI
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 1 receiver and indicates VOR or localizer
deviation.
The glideslope deviation indicator is driven by the glideslope receiver (NAV 1), and indicates the
aircraft’s 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 1 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.
19/1/2007
8-18