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Section 2 System Overview
1
st
Ed Nov 2018
IDU-450 EFIS Software Version 8.0H (Rotorcraft)
2-31
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
Alert Tone
Compares the volume of fuel
designated left wing tank fuel vs.
volume of fuel designated right wing
tank fuel to the fuel split caution
threshold. Issued if the difference
exceeds the fuel split caution
threshold. Only performed if the fuel
split caution threshold is non-zero
and both left and right wing tank fuel
is monitored and valid.
1-minute time delay.
“Fuel Low,
Fuel Low”
A low fuel warning is not active and
one of the following conditions is
true:
1) One of the low fuel caution
discrete inputs is active
2) One of the sensed fuel tank
quantities is below its low fuel
caution threshold
3) Total aircraft fuel is below the
pilot-set minimum fuel threshold.
1-minute time delay.
Alert Tone
Indicates position, track, or
groundspeed difference between
GPS/SBAS units is beyond the
following limits:
Position
:
Enroute Mode 4NM
Terminal Mode 2NM
Departure Mode .6NM
IFR Approach Mode .6NM
VFR Approach Mode .6NM