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actual landing field elevation
* The cabin altitude then climbs to the actual landing field
elevation.
NOTE: When the cabin altitude increases to more than 10,000
feet, the cabin altitude warning alarm will sound. You
can push the ALT HORN CUTOUT switch to deactivate
the alarm.
Descent
When the airplane external pressure increases to 0.25 psi more
than the FLT ALT selection, the descent phase starts.
GUN 101-118, 201-999
The maximum cabin pressurization rate of change for
pressurization is 350 slfpm.
AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO MODE FLIGHT PROFILE - OPERATION
EFFECTIVITY
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GUN 101-118, 201-999 (Continued)
GUN ALL
The cabin pressure controller (CPC) sets the cabin pressure
rate of change for pressurization to 750 slfpm when a cargo fire
occurs. This function is inhibited on the ground.
The system will pressurize the cabin to 0.15 psid below the
LAND ALT selection (landing field elevation).
The 0.15 psid pressurization prevents pressure bumps from
occurring during landing.
Landing
When the airplane lands and the requirements for the ground
phase are met, the system depressurizes the cabin at a rate of
500 slfpm. When the cabin pressure is the same as the local
ambient pressure, the outflow valve opens.
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EFFECTIVITY
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AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO MODE FLIGHT PROFILE - OPERATION
AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO MODE FLIGHT PROFILE - OPERATION
EFFECTIVITY
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Component Locations
The pressurization control system components are in these
areas of the airplane:
* Flight compartment
* E/E compartment
* Forward EE compartment
* Section 47.
Flight Compartment
The cabin pressure control module and cabin altitude panel are
on the P5 forward overhead panel.
EE Compartment
GUN 001-012, 101, 201-999
Cabin pressure controller 1 is on the E2-2 shelf. Cabin pressure
controller 2 is on the E4-1 shelf.
GUN 013-099, 102-118
Cabin pressure controller 1 is on the E2-2 shelf. Cabin pressure
controller 2 is on the E1-1 shelf.
GUN ALL
Section 47
The outflow valve is on the aft right fuselage skin, below the aft
service door.
There are two positive pressure relief valves. One is inboard of
the outflow valve. The other is outboard of the outflow valve.
The negative pressure relief valve is on the aft right fuselage
skin, forward of the outflow valve.
Forward E/E Compartment
The 10,000 FT cabin altitude warning switch is on the ceiling of
the forward E/E compartment.
AIR CONDITIONING - PRESSURIZATION CONTROL - COMPONENT LOCATION
EFFECTIVITY
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AIR CONDITIONING - PRESSURIZATION CONTROL - COMPONENT LOCATION
AIR CONDITIONING - PRESSURIZATION CONTROL - COMPONENT LOCATION
EFFECTIVITY
GUN 001-012, 101, 201-999 21-30-00
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AIR CONDITIONING - PRESSURIZATION CONTROL - COMPONENT LOCATION
AIR CONDITIONING - PRESSURIZATION CONTROL - COMPONENT LOCATION
EFFECTIVITY
GUN 013-099, 102-118 21-30-00
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General Description
Pressurization control can be automatic or manual.
There are two digital cabin pressure controllers (CPCs). Each
CPC has its own systems interface and valve motor system.
This gives the AUTO mode of control a dual redundant
architecture. Only one CPC controls the outflow valve at any
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