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Section 3 Display Symbology
1
st
Ed Nov 2018
IDU-450 EFIS Software Version 8.0H (Rotorcraft)
3-23
Figure 3-41: FPM Absent (Unusual Attitude Mode)
Figure 3-42: PFD with FPM Removed
The FPM is
not shown in basic mode. In unusual attitude mode, it
disappears to allow the pilot to concentrate on the large aircraft symbol
reference marks for unusual attitude recovery.
FPM at low speed (airspeed <= 45 KIAS) behavior further depends upon
whether or not the aircraft is in flight or on the ground and whether or not a
WOW/WOG discrete input is enabled.
In reversionary mode 1 (GPS failure), the FPM changes to a light gray color
after one minute to indicate degraded performance (Figure 3-43).