Aircraft Systems
NAVIGATION INSTRUMENTS
AL250 Flight Manual
MEP
6-6 NAVIGATION INSTRUMENTS
6-6-1 RMI
Figure 6.32: RMI
The RMI comprises two needles (one single and one double yellow pointer) which can
be set to indicate either a NDB or a VOR beacon by means of the two LSK buttons
on the left side of the PFD.
The dedicated LSK button on the left-hand side will make the single needle point to
a VOR or a NDB. A little arrow, located inside the instrument right over the button,
will show which beacon the thin nee dle is indicating. If the VOR display is selected,
then the single ne edle will indicate the information received by the NAV 1.
As well, the dedicated LSK button on the left-hand side will make the double needle
point to a VOR or a NDB. A little arrow, located inside the instrument, right over the
button, will show which beacon the double needle is indicating. If the VOR display is
selected, then the double needle will indicate the information rec eive d by the NAV 2.
In case of a gyro failure — the RMI is driven by the gyro 1 — a red flag HDG will be
displayed. When no valid frequency is received, the corresponding needle points to a
3 o’clock position.
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