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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-113
AIR CONDITIONING - PRESSURIZATION CONTROL - MANUAL MODE - GENERAL DESCRIPTION
AIR CONDITIONING - PRESSURIZATION CONTROL - MANUAL MODE - GENERAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-113
General
The pressurization outflow valve can operate in the manual
mode. To do this, put the pressurization mode selector to the
MANUAL position. The valve can then be opened or closed by
the outflow valve switch. The pressurization mode selector and
the outflow valve switch are on the cabin pressure control panel
on the P5 overhead panel.
Functional Description
When the pressurization mode selector is in the MANUAL
position, these things happen:
* The green MANUAL light comes on
* CPC 1 and CPC 2 stop automatic and alternate modes of
valve operation.
When the outflow valve switch is in the open or close position,
these things happen:
* The manual motor booster changes 28v dc to 48v dc for valve
motor operation
* Power from the booster goes to the valve manual motor.
The direction of valve operation for the open/close functions is
controlled by change of the power supply and return by the
switch positions.
Training Information Point
You can do a check of the valve operation with the manual
mode of valve operation.
WARNING: OUTFLOW VALVE IS MOTOR OPERATED. DO NOT
INSERT HAND OR TOOLS IN OUTLET DURING
ANY GROUND OPERATION OR INJURY TO
PERSONS CAN OCCUR.
AIR CONDITIONING - PRESSURIZATION CONTROL - MANUAL MODE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 21-30-00
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D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-123
AIR CONDITIONING - PRESSURIZATION CONTROL - MANUAL MODE - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - PRESSURIZATION CONTROL - MANUAL MODE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 21-30-00
Page 57
D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-123
Purpose
The positive pressure relief valves prevent over pressure
damage to the airplane structure.
Location
There are two positive pressure relief valves. They are on the
lower, aft airplane fuselage. One valve is on each side of the aft
outflow valve.
General Description
The positive pressure relief valves are fail safe devices that
bleed fuselage pressure overboard if the aft outflow valve fails
closed.
The positive pressure relief valves are mechanical devices and
operate independently. They do not interface with other
airplane pressurization systems and no crew action is
necessary.
The positive pressure relief valves are pneumatically operated
by cabin-to-ambient pressure differential. They control pressure
to a nominal 8.95 +/- 0.15 psi more than ambient.
When the differential pressure is too high, the valve opens. The
open valve lets air out of the airplane. This relieves the cabin
pressure. When the cabin-to-ambient pressure is safe, the valve
closes.
The positive pressure relief valves have filters. The filters clean
the air used in the internal servo and actuator mechanisms.
They attach to pedestals with gaskets and flange clamps.
Training Information Point
Make sure you install the positive pressure relief valve and
gasket correctly during installation. Incorrect installation can
block sense ports for the valve servo mechanism.
Keep the servo mechanisms dry. Moisture in the mechanism
can freeze and prevent valve operation.
AIR CONDITIONING - PRESSURIZATION CONTROL - POSITIVE PRESSURE RELIEF VALVE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-116
AIR CONDITIONING - PRESSURIZATION CONTROL - POSITIVE PRESSURE RELIEF VALVE
AIR CONDITIONING - PRESSURIZATION CONTROL - POSITIVE PRESSURE RELIEF VALVE
EFFECTIVITY
GUN ALL 21-30-00
Page 59
D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-116
Purpose
The negative pressure relief valve prevents negative differential
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