CREW
AWARENESS
AIRPLANE
OPERATIONS
MANUAL
2-04-30
Page
8
Code
01
REVISION 38
AOM-145/1114
MODE 2 - EXCESSIVE CLOSURE RATE TO TERRAIN
Mode 2 provides alerts and warnings based on airspeed, airplane
gear/flap configuration, radio altitude, and excessive closure rate to
terrain. Mode 2 exists in two forms: 2A and 2B.
MODE 2A
Mode 2A is selected when the flaps are not in landing configuration
and the airplane is not on the glide slope beam.
Minimum Terrain Clearance (MTC) for “TERRAIN TERRAIN”
message triggering:
− Minimum: 30 ft at 2038 ft/min of Closure Rate.
− Maximum:
− 1650 ft at 5733 ft/min or greater of Closure Rate, for an
airspeed equal or below 220 KIAS.
− 2450 ft at 9800 ft/min or greater of Closure Rate for an airspeed
equal or above 310 KIAS.
If the airplane penetrates the Mode 2A envelope, the situation results
in:
− Aural message “TERRAIN, TERRAIN” ; and
− "GPWS" warning message on EICAS for airplanes equipped with
GPWS; or
− Amber "GND PROX" indication on the PFD for airplanes equipped
with EGPWS.
If the airplane continues to penetrate the envelope, the aural message
switches to messages described below, until the condition is cleared:
− Aural message “WHOOP WHOOP PULL UP” and "GPWS"
warning message on EICAS for airplanes equipped with GPWS; or
− Aural message “PULL UP” and red "PULL UP" indication on the
PFD for airplanes equipped with EGPWS.
The visual and aural messages will remain on until the airplane has
gained 300 ft of barometric altitude.
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