Section 2 System Overview
2-30
IDU-450 EFIS Software Version 8.0H (Rotorcraft)
1
st
Ed Nov 2018
Table 2-8: Caution Alerts
Visual Alert
Voice Alert/
Alert Tone
Condition
** No time delay
[1]
Only active in dual-sensor installation with neither sensor in failure condition
[2]
Only active in dual-system (pilot and co-pilot)
[3]
Only active when single-pilot mode discrete not asserted
“Check Range,
Check Range”
Based upon flight plan in use on the
indicated side, less than 30 minutes
buffer (at current groundspeed)
between calculated range and
distance to:
1) last waypoint if it is active; or
2) airport if on a missed approach;
or
3) along-route distance to
destination.
Not activated in climbing flight nor if
below 60 kts groundspeed.
5-minute time delay.
Alert Tone
Indicates personality module for
designated IDU (side and CPU #)
could not be read upon power-up.
Internal limits are in use by the
system. Only active on the ground.
Alert Tone
Indicates on the designated IDU
(side and CPU #), aircraft is currently
beyond extent of terrain database or
a failure condition is preventing
TAWS FLTA function from operating.
Half-second time delay. Inhibited
during and for 10 seconds after
unusual attitude mode.
Alert Tone
Triggered when external cooling fan
is commanded on by discrete output,
but the cooling fan status discrete
input indicates the cooling fan is not
rotating. 1-minute time delay.
