Embraer EMB145 Operation Manual page 2109

PNEUMATICS
AIRPLANE
AIR CONDITIONING
OPERATIONS
AND PRESSURIZATION
MANUAL
FLIGHT SEQUENCE
(NORMAL MODE OPERATION)
This sequence is initiated after the takeoff sequence is finished, to
establish a cabin altitude and a cabin altitude rate of change during
flight. The Digital Controller schedules a cabin altitude that is the
greatest value between the theoretical cabin altitude and the selected
landing altitude minus 11 mbar (300 ft at SL).
The cabin altitude rate of change is controlled at different values
depending on the scheduled cabin altitude and the airplane vertical
speed, but is limited to –450 ft/min during descent and as following
while climbing:
− 500 ft/min (for airplanes Pre-Mod. SB 145-21-0006);
− 600 ft/min (for airplanes Post-Mod. SB 145-21-0006 or S/N 145.050
up to 145.362);
− 700 ft/min (for airplanes S/N 145.363 and on).
Barometric correction, when required, is automatically provided by the
Air Data Computer (ADC).
FLIGHT SEQUENCE
(HIGH ALT MODE OPERATION)
During HIGH ALT mode operation the cabin altitude will automatically
descend (at 500 ft/min) to 8000 ft altitude level immediately after
takeoff, avoiding exposing the passengers to 15 minutes of high cabin
altitude.
Page Code
6 02
2-14-15 REVISION 41
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