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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-09-00-103
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - FUNCTIONAL DESCRIPTION
HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General
Hydraulic systems A and B operate independently to supply
hydraulic power to the airplane systems. Both systems operate
at 3000 psi normal pressure and are almost the same.
A hydraulic reservoir pressurization system supplies
pressurized filtered air from the pneumatic system crossover
manifold to the main hydraulic system reservoirs in order to
supply hydraulic fluid under pressure to the hydraulic pumps.
Components
The main hydraulic systems have these components:
* Reservoir (2)
* Overheat/fire protection panel
* Engine-driven pump (EDP) shutoff valve (2)
* Hydraulic panel
* EDP (2)
* Electric motor-driven pump (EMDP) (2)
* Pressure module (2)
* Case drain filter module (2)
* Heat exchanger (2)
* Return filter module (2).
Reservoir
The pneumatic system supplies air to the hydraulic reservoir
pressurization system which pressurizes the reservoirs to
supply hydraulic fluid to the system A and System B electric
motor-driven pumps (EMDP) and engine-driven pumps (EDP).
Overheat/Fire Protection Panel
The overheat/fire protection panel controls the EDP supply
shutoff valves.
EDP Supply Shutoff Valve
EDP supply shutoff valves for each system control hydraulic
fluid to the engine-driven pump (EDP).
Hydraulic Panel
The hydraulic panel controls the engine-driven pump (EDP) and
the electric motor-driven pump (EMDP). The hydraulic panel
also controls the LOW PRESSURE lights for each pump and the
EMDP OVERHEAT lights.
Pumps
The EDP and EMDP pumps in each system supply pressure
continuously to a pressure module. Case drain fluid is used to
cool internal components of the pump and goes to a case drain
filter from each pump.
MAIN HYDRAULIC SYSTEMS - GENERAL DESCRIPTION
EFFECTIVITY
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29-10-00-001
Pressure Module
The pressure module cleans, monitors, and distributes the fluid
pressure from each pump. The pressure module also protects
the system from over pressure.
Case Drain Filter Module
A case drain filter module cleans the case drain fluid from each
pump before it goes to the heat exchanger.
Heat Exchanger
The heat exchanger cools the case drain fluid before it goes
through the top of the return filter module.
Return Filter Module
Each return filter module cleans return fluid before it goes back
to the reservoir.
Main Hydraulic System A
Hydraulic system A supplies pressure for these airplane
systems:
* Left thrust reverser
* Power transfer unit (PTU) motor
* Landing gear extension and retraction
* Nose wheel steering
* Alternate brakes
* Ailerons
* Autopilot A
* Elevators
* Elevator feel
* Flight spoilers 2, 4, 9, and 11
* Ground spoilers 1, 6, 7, and 12
* Rudder.
Main Hydraulic System B
Hydraulic system B supplies pressure for these airplane
systems:
* Right thrust reverser
* Alternate landing gear retraction
* Alternate nose wheel steering
* Normal brakes
* Ailerons
* Autopilot B
* Elevators
* Elevator feel
* Flight spoilers 3, 5, 8, and 10
* Rudder
* Trailing edge flaps
* Leading edge flaps and slats.
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EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-001
MAIN HYDRAULIC SYSTEMS - GENERAL DESCRIPTION
MAIN HYDRAULIC SYSTEMS - GENERAL DESCRIPTION
EFFECTIVITY
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29-10-00-001
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MAIN HYDRAULIC SYSTEMS - GENERAL DESCRIPTION
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