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29-30-00 HYD INDICATING SYS - GENERAL DESCRIPTION 6 GUN ALL
29-30-00 HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - HYD FLUID
QTY TRANSMITTER/INDICATOR
9 GUN ALL
29-30-00 HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - STBY HYD
SYS RESERVOIR LOW QTY SWITCH
12 GUN ALL
29-30-00 HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS -
FUNCTIONAL DESCRIPTION - MAIN HYD SYS
14 GUN ALL
29-30-00 HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS -
FUNCTIONAL DESCRIPTION - STBY HYD SYS
16 GUN ALL
29-30-00 HYD INDICATING SYS - HYD PRESSURE INDICATING SYS - MAIN HYD
SYS PRESSURE TRANSMITTER
20 GUN ALL
29-30-00 HYD INDICATING SYS - HYD PRESSURE INDICATING SYS -
FUNCTIONAL DESCRIPTION
22 GUN ALL
29-30-00 HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS -
HYD PUMP LOW PRESSURE SWITCHES
24 GUN ALL
29-30-00 HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS -
FUNCTIONAL DESCRIPTION - MAIN HYD SYS
26 GUN ALL
29-30-00 HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS -
FUNCTIONAL DESCRIPTION - STBY HYD SYS
28 GUN ALL
29-30-00 HYD INDICATING SYS - HYD FLUID OVERHEAT WARNING SYS - HYD
FLUID OVERHEAT WARNING SWITCH
32 GUN ALL
29-30-00 HYD INDICATING SYS - HYD FLUID OVERHEAT WARNING SYS -
FUNCTIONAL DESCRIPTION
34 GUN ALL
29-CONTENTS
Page 4
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 29
Hydraulic Power
THIS PAGE IS INTENTIONALLY LEFT BLANK
29-00-00
Page 1
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
There are three independent hydraulic systems that supply
hydraulic power for user systems.
The main and auxiliary hydraulic systems supply pressurized
fluid to these airplane systems:
* Both thrust reversers
* Power transfer unit (PTU) motor
* Landing gear extension and retraction
* Nose wheel steering
* Main gear brakes
* Primary flight controls
* Secondary flight controls.
These systems make up the hydraulic power system:
* Main hydraulic systems
* Ground servicing system
* Auxiliary hydraulic systems
* Hydraulic indicating systems.
Main Hydraulic Systems
The main hydraulic systems are A and B. System A has most of
its components on the left side of the airplane and system B on
the right side.
Ground Servicing System
The ground servicing system fills all hydraulic reservoirs from
one central location.
Auxiliary Hydraulic Systems
The auxiliary hydraulic systems are the standby hydraulic
system and the power transfer unit (PTU) system.
The standby hydraulic system is a demand system that supplies
reserve hydraulic power to these components:
* Rudder
* Leading edge flaps and slats
* Both thrust reversers.
The hydraulic power transfer unit (PTU) system is an alternate
source of hydraulic power for the leading edge flaps and slats
and autoslat system.
Hydraulic Indicating Systems
These are the indicating systems:
* Hydraulic fluid quantity
* Hydraulic pressure
* Hydraulic pump low pressure warning
* Hydraulic fluid overheat warning.
The hydraulic indicating systems show these indications in the
flight compartment:
HYDRAULIC POWER - INTRODUCTION
EFFECTIVITY
GUN ALL 29-00-00
Page 2
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-00-00-001
* System A and B reservoir quantity
* Standby reservoir low quantity
* System A and B pressure
* System A and B engine-driven pump (EDP) low pressure
* System A and B electric motor-driven pump (EMDP) low
pressure
* Standby electric motor-driven pump low pressure
* System A and B electric motor-driven pump (EMDP)
overheat.
Training Information Point
WARNING: HYDRAULIC FLUID, BMS 3-11, CAN CAUSE
INJURY TO PERSONS. IF YOU GET THE
HYDRAULIC FLUID ON YOUR SKIN, FLUSH YOUR
SKIN WITH WATER. IF YOU GET HYDRAULIC
FLUID IN YOUR EYES, FLUSH YOUR EYES WITH
WATER AND GET MEDICAL AID. IF YOU EAT OR
DRINK THE HYDRAULIC FLUID, GET MEDICAL
AID.
The hydraulic systems use BMS 3-11 TYPE IV erosion arresting,
fire resistant hydraulic fluid.
Abbreviations and Acronyms
* ac - alternating current
* alt - alternate
* APU - auxiliary power unit
* auto - automatically
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