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The hydraulic pump low pressure warning system gives
indications when the pressure of any hydraulic pump on the
airplane decreases to less than normal. The system uses
pressure switches on the hydraulic system A and system B
pressure modules to send signals to the HYD PUMP LOW
PRESSURE light on the hydraulic panel.
The system uses a pressure switch on the standby hydraulic
system module to send a signal to the STANDBY HYD LOW
PRESSURE light on the flight control panel.
Hydraulic Fluid Overheat Warning System
The hydraulic fluid overheat warning system gives indications
when the temperature of hydraulic system A or system B
electric motor-driven pump (EMDP) is more than normal. The
system uses temperature switches in the EMDPs and in the
pump case drain lines to send signals to the HYD PUMP
OVERHEAT lights on the hydraulic panel.
HYD INDICATING SYS - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 29-30-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-001
HYD INDICATING SYS - GENERAL DESCRIPTION
HYD INDICATING SYS - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 29-30-00
Page 7
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-001
HYD INDICATING SYS - GENERAL DESCRIPTION
HYD INDICATING SYS - GENERAL DESCRIPTION
EFFECTIVITY
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB 737-27-1253 29-30-00
Page 8
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-001
Purpose
The hydraulic fluid quantity transmitter/indicators show the
hydraulic fluid level in the hydraulic systems A and B
reservoirs.
Location
The hydraulic fluid quantity transmitter/indicators are on the
hydraulic systems A and B reservoirs in the main gear wheel
well.
Physical Description
Each hydraulic fluid quantity transmitter/indicator is a float-type,
level-quantity transmitter with a direct-reading indicator. The
indicator has these marks:
* O for empty
* RFL for refill
* F for full.
The hydraulic fluid quantity transmitter/indicators include these
components:
* Float
* Indicator
* Transmitter.
The fluid quantity transmitters are not interchangeable. The
mounting bolt holes are arranged so that system A cannot be
used on system B. Internal calibrations are different due to
different reservoir size.
Functional Description
The float moves up and down on the fluid in the reservoir and
pivots on the transmitter body. The float lever operates the
transmitter and the indicator.
The indicator shows the fluid quantity on a mechanical indicator
on the reservoir in the main landing gear wheel well.
The transmitters send signals to the display electronic units
(DEU). The DEU sends a signal to the common display unit (DU).
The DU shows fluid quantity on the systems display in percent
of full.
See the common display system for more information about the
display electronics unit. (SECTION 31-62)
The system B quantity transmitter has a low quantity switch.
When the system B hydraulic fluid quantity is less than 21%, the
switch opens. This inhibits alternate nose wheel steering.
See the nose wheel steering system for more information about
the alternate nose wheel steering. (SECTION 32-51)
HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - HYD FLUID QTY TRANSMITTER/INDICATOR
EFFECTIVITY
GUN ALL 29-30-00
Page 9
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-004
Training Information Point
CAUTION: MAKE SURE THE TRANSMITTER FLOAT DOES
NOT TOUCH THE INTERNAL STAND PIPE. IF THE
TRANSMITTER FLOAT TOUCHES THE INTERNAL
STAND PIPE, DAMAGE TO THE TRANSMITTER
CAN OCCUR.
NOTE: When the reservoir is serviced to the F (full) position,
the quantity indication should show 100% on the
engine display in the flight compartment.
HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - HYD FLUID QTY TRANSMITTER/INDICATOR
EFFECTIVITY
GUN ALL 29-30-00
Page 10
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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