CREW
AWARENESS
AIRPLANE
OPERATIONS
MANUAL
2-04-30
Page
16
Code
01
REVISION 38
AOM-145/1114
MODE 4B
Mode 4B is active during cruise and approach with the landing gear
down and flaps in other than landing configuration.
Minimum Terrain Clearance (MTC) for "TOO LOW FLAPS" message
triggering:
− Minimum: 30 ft.
− Maximum: 245 ft for an airspeed equal or less than 159 KIAS.
Minimum Terrain Clearance (MTC) for “TOO LOW TERRAIN”
message triggering:
− Minimum: 30 ft.
− Maximum: 1000 ft for an airspeed equal or higher than 250 KIAS.
If during cruise the ground is slowly getting closer and the airplane is
not in the landing configuration, or during approach with an
unintentional gear up landing, the aural message "TOO LOW
TERRAIN" will be sounded. Once the message is issued, an additional
20% altitude loss is required for the issuing of a new message.
The "GPWS" warning message is displayed on EICAS for airplanes
equipped with GPWS and the amber "GND PROX" indication on the
PFD for airplanes equipped with EGPWS.
If the airplane penetrates below the 245 ft AGL boundary with the
landing gear down and flaps in other than landing configuration, the
aural message will be "TOO LOW FLAPS". Once message is issued,
an additional 20% altitude loss is required for the issuing of a new
message.
The visual and aural messages cease when the mode 4B is exited.
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