Genesys IDU-450 8.0H, Pilot'S Manual, Page: 301 / 396

Section 8 Terrain Awareness Warning System
1 st Ed Nov 2018 IDU-450 EFIS Software Version 8.0H (Rotorcraft) 8-13
Table 8-10: HTAWS GPWS Mode 5 Envelopes
Caution Threshold Warning Threshold
Greater of:
1.3 1.4%
150 AGL Altitude Dots
or
1.3 Dots
Greater of:
2 1%
150 AGL Altitude Dots
or
2 Dots
Figure 8-11: Rotorcraft GPWS Mode 5
8.9. External Sensors and Switches
TAWS requires a variety of inputs from external sensors and switches to
perform its functions as follows:
1) GPS/SBAS Receiver : Source of aircraft position, geodetic height,
horizontal figure of merit (HFOM), vertical figure of merit (VFOM), loss
of integrity (LOI), and loss of navigation (LON) inputs.
2) Air Data Computer (ADC) : Source of barometric altitude, outside air
temperature, and vertical speed.
3) ILS Receiver : Glideslope receiver is the source of glideslope deviation.
4) Radar Altimeter (RA) : Source for radar altitude.
0
200
400
600
800
1000
1200
0 1 2 3 4
Height Above
Terrain
(FT)
Below Glide Slope Deviation (Dots)
Rotorcraft Mode 5
Caution Warning