CREW
AWARENESS
AIRPLANE
OPERATIONS
MANUAL
2-04-30
Page
12
Code
01
REVISION 39
AOM-145/1114
MODE 3 - ALTITUDE LOSS AFTER TAKEOFF
Mode 3 provides alerts and warnings for a significant altitude loss after
takeoff with landing gear UP or flaps in other than landing
configuration. The amount of altitude loss required to trigger the
warning depends on the height of the airplane above the terrain.
Minimum Terrain Clearance (MTC) for “DON'T SINK, DON'T SINK”
message triggering:
− Minimum: 30 ft at 5 ft of altitude loss.
− Maximum: 1500 ft at 143 ft or greater of altitude loss.
Significant altitude loss after takeoff or during a low altitude go-around
activates the aural message “DON'T SINK, DON'T SINK” and:
− "GPWS" warning message on EICAS for airplanes equipped with
GPWS; or
− Amber "GND PROX" indication on the PFD for airplanes equipped
with EGPWS.
The audio message is only annunciated twice, unless excessive
altitude loss continues to accumulate.
Once triggered, the visual message can only be cancelled achieving a
positive rate of climb relative to the original altitude. Therefore, as long
as the original altitude is not crossed, any descent will trigger the aural
and visual messages again. After crossing the original altitude, a new
altitude value is set every moment.
NOTE: For airplanes Post-Mod. SB 145-34-0088 or equipped with an
equivalent modification factory incorporated, there is a time-
delay of 10 seconds to inhibit the generation of the “DON'T
SINK, DON'T SINK” aural message in the transition from
landing to take-off configuration, during a go-around
maneuver.
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