Section 2 System Overview
1
st
Ed Nov 2018
IDU-450 EFIS Software Version 8.0H (Rotorcraft)
2-35
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
“Sink Rate,
Sink Rate”
Within GPWS Mode 1 caution
envelope. (Used on CPU #0 only.)
Half-second time delay.
“Glideslope,
Glideslope”
Within GPWS Mode 5 caution
envelope. (Used on CPU #0 only.)
Half-second time delay.
“Too Low
Terrain, Too
Low Terrain”
Within GPWS Mode 3 envelope.
(Used on CPU #0 only.)
Half-second time delay.
Within GPWS Mode 4-1 “Too Low
Terrain” envelope. (Used on CPU #0
only.) Half-second time delay.
“Too Low
Gear, Too Low
Gear”
Within GPWS Mode 4-2 “Too Low
Gear” envelope. (Used on CPU #0
only.) Half-second time delay.
“Caution
Obstruction,
Caution
Obstruction”
Obstruction within TAWS FLTA
caution envelope. (Used on CPU #0
only.) Half-second time delay.
“Traffic, Traffic”
Not given if own aircraft below 400’
AGL nor if target is below 200’AGL
(ground target). (Used on CPU #0
only.)**
2.5.4 Side-Specific Caution Alerts
Side-specific caution alerts are displayed on all IDUs on a side that detect
a failure on an IDU on that side.
Table 2-9: Side-Specific Caution Alerts
Visual Alert
Alert Tone
Condition
** No time delay
Alert Tone
IDU status has not been received
from another same-side IDU in the
last second ± 0.1 seconds. #
indicates which IDU is failing the
check. **