AL50/MPG5
Chapter 8. OPERATION OF THE SIMULATED AIRCRAFT’S SYSTEMS
8-6. NAVIGATION INSTRUMENTS
The second OBI is located to the right and above the control wheel.
Figure 8.27: Second OBI
The compass card can be turned to indicate the current heading by means of the encoder on the
instrument’s frame.
The pivoting needle is driven by the NAV2 receiver and indicates deviation from the selected VOR
or localizer beacon. The aircraft is on course if the needle is vertical (i.e. its tail in the little circle
in the middle of the scale).
A white triangle (also driven by the NAV2) indicates whether the aircraft is flying to or from the
selected beacon.
A red and white flag will appear when there is no valid NAV information.
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DME
The DME is located between the ADF and the engine instruments.
Figure 8.28: DME indicator
In order to change its frequency or its mode, you first need to select the DME as your active radio
(surrounded by the bright yellow rectangle). You do this by means of the frequency SELECT
button (to the right of the radios). If you turn the button clockwise, the radios will be activated in
the following sequence: COM1, NAV1, NAV2, XPDR, DME, ADF, COM2. If you turn the button
anti-clockwise, the yellow rectangle jumps counter-clockwise as well.
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