Embraer EMB145 Operation Manual page 1639

CREW
AWARENESS
MODE 4C
Mode 4C is active during takeoff phase or low altitude go-around with
either the landing gear or flaps in other than landing configuration,
when the terrain is rising closer than the airplane is climbing.
Only in this case, the Minimum Terrain Clearance is a function of the
Radio Altitude of the airplane.
Minimum Terrain Clearance (MTC) for "TOO LOW TERRAIN"
message triggering:
− Minimum: 30 ft.
− Maximum:
− 500 ft at 667 ft or greater of radio altitude for an airspeed less or
equal or less than 190 KIAS.
− 1000 ft at 1333 ft or greater of radio altitude for an airspeed
equal or above 250 KIAS.
If during takeoff or low altitude go-around with either the landing gear
or flaps in other than landing configuration, when the terrain is rising
more steeply than the airplane is climbing, the aural message "TOO
LOW TERRAIN" will be sounded.
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.
Page
2-04-30
18
AIRPLANE
OPERATIONS
MANUAL
Code
01
REVISION 38