Operation Manual Part 2

Aerosoft – Digital Aviation
CRJ-70 & CRJ-900
AOM PART 2
Systems Description
VOL
5
5-1-109
26-Jul-2017
MODE 1 – EXCESSIVE DESCENT RATE
Mode 1 is used during the approach phase of the aircraft and is independent of the aircrafts config.
In case the GPWS detects excessive sink rate close to terrain during approach the “SINKRATE, SINKRATE” aural
warning is triggered first together with the GND PROX lights coming on. In case the condition persists the
“(WHOOP, WHOOP) PULL UP” aural warning sounds and the PULL UP lights illuminate.
MODE 2 – EXCESSIVE TERRAIN CLOSURE RATE
Mode 2 alerts are triggered when the aircraft is nearing terrain at an excessive rate. Depending on the
configuration different sub-modes are activated.
The GND PROX lights remain illuminated until 300 ft of barometric altitude has been achieved, or 45 seconds
have elapsed, or the GND PROX FLAP OVRD has been selected, or flaps are in landing configuration.
MODE 3 – ALTITUDE LOSS AFTER TAKE-OFF
In case the aircraft loses a significant amount of altitude during the following flight phases
• After take-off
• Low altitude go-around with gear or flaps not in landing configuration
The GND PROX lights illuminate and the DON’T SINK DON’T SINK aural warning is sounded. The tolerated
amount of altitude loss depends on the aircrafts altitude above terrain.