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* Rudder.
Fluid Supply
Air from the pneumatic system pressurizes the reservoir.
The reservoir supplies pressurized fluid to the EDP and EMDP
hydraulic pumps. The reservoir supplies fluid to the EDP
through a standpipe.
The EDP supply shutoff valve controls supply fluid to the EDP.
Pressurization
The EDP and EMDP supply pressure continuously.
The PTU motor receives pressure and supplies an emergency
source of hydraulic power to the leading edge flaps and slats.
The ground service disconnect module allows pressurization of
hydraulic system A from a ground service cart.
Filtration
The system pressure module filters clean the output pressure
fluid from the pumps.
Case drain filter modules clean the case drain fluid from the
EDP and EMDP pumps.
A return filter module cleans the return flow of hydraulic fluid
from the user systems. The module can be bypassed.
Fluid Cooling
The heat exchanger cools the fluid from the case drains of the
pumps before the fluid goes back to the reservoir.
Indication
Temperature switches monitor the EMDP electric motor and the
EMDP case drain fluid temperatures.
Pump pressure switches monitor the EMDP and EDP pump
pressures.
MAIN HYDRAULIC SYSTEMS - SYSTEM A - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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The system pressure transmitter monitors the system pressure.
MAIN HYDRAULIC SYSTEMS - SYSTEM A - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 29-10-00
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MAIN HYDRAULIC SYSTEMS - SYSTEM A - FUNCTIONAL DESCRIPTION
MAIN HYDRAULIC SYSTEMS - SYSTEM A - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 29-10-00
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D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-016
THIS PAGE IS INTENTIONALLY LEFT BLANK
MAIN HYDRAULIC SYSTEMS - SYSTEM A - FUNCTIONAL DESCRIPTION
29-10-00
Page 52
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
Hydraulic system B supplies pressurized fluid to these systems:
* Right thrust reverser
* Power transfer unit (PTU) pump
* 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.
Fluid Supply
Air from the pneumatic system pressurizes the reservoir.
The reservoir supplies pressurized fluid to the EDP and EMDP
hydraulic pumps through a standpipe. The EDP supply shutoff
valve controls supply fluid to the EDP.
The PTU pump receives fluid from the bottom of the reservoir.
Pressurization
The EDP and EMDP supply pressure continuously.
The PTU pump supplies an emergency source of hydraulic
power to the leading edge flaps and slats.
The ground service disconnect module allows pressurization of
hydraulic system B from a ground service cart.
Filtration
The system pressure module filters clean the output pressure
fluid from the pumps.
Case drain filter modules clean the case drain fluid from the
EDP and EMDP pumps.
The return filter module cleans the return flow of hydraulic fluid
from the user systems.
Fluid Cooling
The heat exchanger cools the fluid from the case drains of the
pumps before the fluid goes back to the reservoir.
Indication
Temperature switches monitor the EMDP electric motor and the
EMDP case drain fluid temperatures.
Pump pressure switches monitor the EMDP and EDP pump
pressures.
MAIN HYDRAULIC SYSTEMS - SYSTEM B - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 29-10-00
Page 53
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-10-00-017
The system pressure transmitter monitors the system pressure.
MAIN HYDRAULIC SYSTEMS - SYSTEM B - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 29-10-00
Page 54
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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