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the airplane structure from overpressure and negative pressure
if the pressurization control system fails. The cabin pressure
relief system has these components:
* Two positive pressure relief valves
* Negative pressure relief valve.
Cabin Pressure Indication and Warning System
The cabin pressure indication and warning system gives you
data about the pressurization system status. This system has
these components:
* Cabin altitude panel
* Aural warning module
* Cabin altitude warning switch.
AIR CONDITIONING - PRESSURIZATION CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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AIR CONDITIONING - PRESSURIZATION CONTROL - GENERAL DESCRIPTION
AIR CONDITIONING - PRESSURIZATION CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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Purpose
The automatic (AUTO or ALTN) mode of the pressurization
system controls the airplane pressure for all phases of flight:
* Ground
* Takeoff
* Climb
* Cruise
* Descent
* Landing.
Control Module Selections
To use the AUTO mode, make these selections on the cabin
pressure control module:
* Select AUTO mode
* Set FLT ALT
* Set LAND ALT.
Ground
When all these conditions occur, the system is in the ground
phase:
* Air/ground system shows that the left and right landing gear
are on the ground
* N1 on both engines is less than 50% for at least 1.5 seconds
(or engines are off)
* N2 on both engines is less than 84% for at least 1.5 seconds
(or engines are off).
When the airplane is in the ground phase, the airplane is
unpressurized and the outflow valve is open.
Takeoff
These changes cause the takeoff phase to start:
* N1 on both engines increases to more than 60% for at least
1.5 seconds
* N2 on both engines increases to more than 89% for at least
1.5 seconds.
In the takeoff phase, the system pressurizes the cabin to 0.1
psid below field elevation. This prevents the uncomfortable
pressure bump (momentary pressure increase) at airplane
rotation.
The cabin pressurization rate of change during the takeoff
phase is 350 slfpm.
Climb
When the air/ground system indicates that the left and right
landing gear are in the air, the climb phase starts.
GUN 101-118, 201-999
The maximum cabin pressurization rate of change for
depressurization is 600 slfpm.
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AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO MODE FLIGHT PROFILE - OPERATION
EFFECTIVITY
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Cruise
When the airplane external pressure decreases to within 0.25
psi of the FLT ALT selection (cruise altitude), the cruise phase
starts.
In the cruise phase, the system maintains a constant cabin
altitude. The cabin altitude will be the landing field elevation for
flights with a flight altitude of 18,500 feet or less. For flights with
a flight altitude above 18,500 feet, the cabin altitude will increase
to a pressure differential that airplane is within a safe limit.
These are the pressure schedules:
FLIGHT ALTITUDE SCHEDULE
SEA LEVEL TO 18,500 LANDING FIELD ELEVATION
18,500 TO 28,000 7.45 +/- 0.15 psid
28,000 TO 37,000 7.80 +/- 0.15 psid
37,000 AND ABOVE 8.35 +/- 0.15 psid
NOTE: Deviations from flight altitude may cause the pressure
to go as high as 8.45 psid to maintain a constant cabin
altitude.
The maximum cabin altitude for most flights is 8,000 feet.
When the landing field elevation is more than 8,000 feet and the
flight length is less than 60 minutes, this occurs:
* Flight crew enters the actual landing field elevation prior to
departure
* During the cruise phase, the cabin altitude is the landing field
elevation.
When the landing field elevation is more than 8,000 feet and the
flight length is more than 60 minutes, this occurs:
* Flight crew enters 6,000 feet for the landing field elevation
prior to departure
* During the cruise phase, the cabin altitude is per the
pressure schedule
* Twenty minutes prior to landing the flight crew enters the
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