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OPERATING MANUAL
PSP 606
During take-off, the ground control subsystem pressurizes the cabin at the
selected rate when the throttles are advanced beyond 60% of their maximum
travel. If the throttles are subsequently retarded below 60£ travel, the
cabin automatically depressurizes at the selected rate. When the aircraft
lifts off, the weight-on-wheels signal is removed and the automatic
selector increases cabin altitude at the selected rate until the desired
cabin altitude is reached. The system maintains the cabin at the desired
altitude until the ALT selection is changed to accomodate aircraft climb or
descent.
H. Manual Operation
When the MODE selector switch is set to MAN, the automatic sensing devices
are inoperative, and the system is controlled by operation of the manual
regulator. In order to maintain the cabin pressurization at the required
level, the altimeter needle and rate indicator on the cabin altitude
indicator (refer to Figure 8) must be monitored.
SECTION 2
Page 18
Mar 01/85
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OPERATING MANUAL
PSP 606
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Cabin Pressure Control
Figure 7
Schematic SECTION 2
Page 19
Mar 01/85
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OPERATING MANUAL
PSP 606
RATE OF CLIMB POINTER
Indicates rate of climb or descent of cabin
altitude.
DIFFERENTIAL PRESSURE POINTER
Indicates cabin/ambient pressure
in psi up to 10 psi maximum.
ALTITUDE POINTER
Indicates cabin altitude in thousands
of feet up to maximum of 50,000 feet.
MAXIMUM INDEX
White index at normal maximum cabin
altitude of 8000 feet.
DIFFERENTIAL PRESSURE CAUTION
AND WARNING INDEXES
Yellow band - 9.16 to 9.3 psi.
Red band - 9.3 to 9.6 psi.
CABIN ALTITUDE WARNING RANGE
Cabin altitude warning indicated by red
band between 10,000 and 50,000 feet.
CABIN ALTITUDE INDICATOR
Indicates cabin altitude and rate of change of cabin altitude.
Pneumatic mechanism receives inputs from cabin and aircraft
static pressure sources.
Cabin Altitude Indicator SECTION 2
Figure 8 Page 20
Mar 01/85
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Bombardier-Challenger_00-Air_Cond_and_Pressl(8)
