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* OFF SCHED DESCENT (deviation from flight plan)
* ALTN (operational mode)
* MANUAL (operational mode).
Cabin Altitude Panel
These are the indications and controls on the cabin altitude
panel:
* Cabin altitude/differential pressure indicator
* Cabin rate of climb indicator
* ALT HORN CUTOUT switch.
AIR CONDITIONING - PRESSURIZATION CONTROL - CABIN PRESSURE CONTROL MODULE AND CABIN ALT PANEL
EFFECTIVITY
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The cabin altitude and differential pressure indicator is
connected to the alternate static system. The large needle on
the indicator shows cabin pressure differential in 0.2 psid
increments. The small needle shows cabin altitude in 1,000 ft
increments.
The rate of climb indicator detects pressure changes from a
port on the back of the indicator.
When cabin altitude is more than a preset limit, the aural
warning unit makes an intermittent beep alarm. The ALT HORN
CUTOUT switch is used to stop the intermittent beep alarm.
Placards on the control panels are a reference for manual mode
operations. They provide a reference for:
* Takeoff and landing pressure differential maximums
* Flight altitude to cabin altitude conversions.
Training Information Point
The cabin pressure control module has integrated circuit
electronics. It is an electro-static discharge sensitive (ESDS)
device. Use proper care when you handle it.
Flush operations of the vacuum toilet system can cause the
cabin rate of climb indicator to momentarily show a high rate of
climb indication. This is normal.
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AIR CONDITIONING - PRESSURIZATION CONTROL - CABIN PRESSURE CONTROL MODULE AND CABIN ALT PANEL
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EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The cabin pressure controllers (CPC) control cabin pressure
when the system is in the AUTO or ALTN mode of operation.
General Description
There are two CPCs. The CPCs use digital circuitry.
The CPCs are part of a dual redundant system. They are active
when the system operates in the AUTO or ALTN modes. Only
one CPC operates the outflow valve at any given time. The other
CPC acts as a backup.
The CPCs have pin selectable control functions. This function
optimizes the system for specific mission profiles.
Location
GUN 001-012, 101, 201-999
The two CPCs are in the EE compartment. CPC 1 is on the E2-2
shelf. CPC 2 is on the E4-1 shelf.
GUN 013-099, 102-118
The two CPCs are in the EE compartment. CPC 1 is on the E2-2
shelf. CPC 2 is on the E1-1 shelf.
GUN ALL
Physical Description
Each CPC has these items:
* Cabin pressure sensor
* BITE instruction plate
* Two-line LED display
* BITE control buttons.
BITE
Each CPC has these main menus:
* EXISTING FAULTS
* FAULT HISTORY
* GROUND TESTS
* SYSTEM STATUS
* SYSTEM TEST AND CLEAR.
These are the functions of the BITE control buttons:
* ON/OFF button activates or de-activates the BITE functions in
the CPC
* MENU button is used to display the BITE menus or to move
up one level in the BITE menus
* YES button is used to respond to questions
* NO button is used to respond to questions
* Up arrow button is used to scroll up through the menu or the
results of a BITE test
* Down arrow button is used to scroll down through the menu
or the results of a BITE test.
AIR CONDITIONING - PRESSURIZATION CONTROL - CABIN PRESSURE CONTROLLER
EFFECTIVITY
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