Embraer EMB145 Operation Manual page 2105

PNEUMATICS
AIRPLANE
AIR CONDITIONING
OPERATIONS
AND PRESSURIZATION
MANUAL
If, however, the cabin altitude indication continuously increases and
the system is out of its normal range of operation, causing a cabin
depressurization, the CPAM sends a signal to the aural warning
system to alert the crew when cabin altitude is above 9900 ± 100 ft.
Some airplanes are equipped and certified with HIGH ALT mode.
HIGH ALT is a designation for High Altitude Takeoff and Landing
Operation mode which allows operations above 8000 ft up to 13500 ft.
The pilot activates the HIGH ALT mode manually by pressing a Bezel
Button on the MFD Display. When HIGH ALT mode is selected an
indication on MFD Display becomes boxed and the message
"HI ALT LDG-T/O" will appear on EICAS. This message will advise the
flight crewmembers the shift of aural warning from 9900 ± 100 ft to
14500 ± 500 ft; the shift of cabin altitude color range indication on
EICAS, and the inhibition of Cabin Pressure Control System (CPCS)
takeoff-abort mode.
Also, for these airplanes equipped and certified with HIGH ALT mode
the passengers oxygen masks switches are set to deploy masks at
14500 ± 500 ft cabin altitude pressure.
When HIGH ALT mode is not active the airplane is in NORMAL mode
operation. In NORMAL mode operation the airplane functions are
exactly the same as in airplanes not equipped with HIGH ALT system.
Some following information with NORMAL mode inscription in this
chapter refers to either cases.
Page Code
2 02
2-14-15 REVISION 41
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