R Mod. : (4403 + 4404) or 5262
ATR 42 Model : 500
GPWS
NAVIGATION SYSTEM
P 1
NOV 01
100
1.15
.
40
40.1 DESCRIPTION
(See schematic p 9/10)
The Ground Proximity Warning System (GPWS) provides visual and aural alerts in
case of dangerous flight path conditions which would result in inadvertent ground
contact if maintained. The system generates alerts only between 50 ft and 2500 ft
AGL.
Six alert modes are established with defined danger envelopes :
- Mode 1 excessive sink rate.
- Mode 2 excessive terrain closure rate.
- Mode 3 descent after take off.
- Mode 4 inadvertent proximity to terrain with landing gear of flaps not in landing
configuration.
- Mode 5 descent below ILS glideslope.
- Mode 6 descent below minimums.
The GPWS includes :
- A GPWS computer.
- Two GPWS/GS lights.
- A GPWS FAULT amber light on CAP.
- A GPWS selector
- Several aural alert channels.
- STEEP APP pb (Sink rate alert inhibition)
For operation, the system requires data supply from ADC 1, ILS 2, radio altimeter,
flaps position transmitter and gear lever position transmitter.
Mode 5 is active whenever a valid ILS glideslope signal is supplied. If the ILS
converter signals no computed data, mode 5 alert is inhibited. The mode 5 alert is also
inhibited in back course operation.
Visual alert is provided :
- In mode 1, 2, 3, or 4 by illumination of the GPWS red lights, one on each pilots panel
- In mode 5 by illumination of the GS amber lights, one on each pilots panel.
The aural alerts are voice alerts which segregate the various alert modes.
Mode 5 alerts may be inhibited by pressing one of the GPWS/GS pb below 1000 ft.
The GPWS selector on the captain side panel is provided to avoid nuisance alerts in
mode 4 caused by flap position when a landing has to be performed with reduced flap
setting. In case of GPWS malfunction, all alerts can be inhibited by selection to OFF.
The system can be tested on ground and in flight above 1000 ft radio height by
pressing one of the GPWS/GS lt.
AA
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