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Section 2 System Overview
2-26
IDU-450 EFIS Software Version 8.0H (Rotorcraft)
1
st
Ed Nov 2018
Table 2-5: Warning Alert Elements
Type Alert
Location
Flash
Rate
Audio Alert
at Full Volume
PFD lower
left corner of
transmit
enabled IDU
2 Hz
Repeated until
acknowledged
Table 2-6: Warning Alerts
Visual Alert
Voice Alert
Condition
** No time delay
“Fuel Low, Fuel
Low”
One of the following conditions is
true:
1) A low fuel warning discrete
input is active
2) A sensed fuel tank quantity is
below its low fuel warning
threshold
3) Total aircraft fuel is below the
pilot-set emergency fuel
threshold.
1-minute time delay.
“Warning
Obstruction,
Warning
Obstruction”
Obstruction within TAWS FLTA
warning envelope. (Used on CPU
#0 only.) Half-second time delay.
“Warning,
Terrain, Warning
Terrain”
Terrain cell within HTAWS FLTA
warning envelope. (Used on CPU
#0 only.) Half-second time delay.
“Pull Up, Pull
Up”
Within GPWS Mode 1 warning
envelope. (Used on CPU #0 only.)
Half-second time delay.
“Terrain, Terrain,
Pull Up, Pull Up”
Within GPWS Mode 2 warning
envelope. (Used on CPU #0 only.)
Half-second time delay.
“Glideslope,
Glideslope”
Within GPWS Mode 5 warning
envelope. (Used on CPU #0 only.)
Half-second time delay.