CREW
AWARENESS
AIRPLANE
OPERATIONS
MANUAL
2-04-30
Page
6
Code
01
REVISION 38
AOM-145/1114
MODES AND MESSAGES
MODE 1 - EXCESSIVE DESCENT RATE
Mode 1 provides alerts and warnings when the airplane has attained
an excessive descent rate in respect to altitude above ground level
(AGL) during the descent and approach phases of flight.
This mode has outer (sink rate) and inner (pull up) alert/warning
boundaries:
Minimum Terrain Clearance (MTC) for “SINK RATE” message
triggering:
− Minimum: 30 ft at 1000 ft/min of descent Altitude Rate.
− Maximum: 2450 ft at 5007 ft/min or greater of descent Altitude
Rate.
Minimum Terrain Clearance (MTC) for “WHOOP WHOOP PULL UP”
or “PULL UP” message triggering:
− Minimum: 30 ft at 1710 ft/min of descent Altitude Rate.
− Maximum: 2450 ft at 7125 ft/min or greater of descent Altitude
Rate.
Penetration of the outer (sinkrate) boundary will result in:
− Aural message “SINK RATE”. The message will be repeated as
long as the penetration increases; and
− "GPWS" warning message on EICAS for airplane equipped with
GPWS; or
− Amber "GND PROX" indication on the PFD for airplane equipped
with EGPWS.
Penetration of the inner (pull up) boundary causes the repeated aural
message until the condition is cleared, as follows:
− 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.
If a valid ILS Glideslope front course signal is received and the
airplane is above the glideslope centerline, the sinkrate boundary is
adjusted to prevent unwanted alerts when the airplane is safely
capturing the glideslope.
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