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29-30-00-004
HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - HYD FLUID QTY TRANSMITTER/INDICATOR
HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - HYD FLUID QTY TRANSMITTER/INDICATOR
EFFECTIVITY
GUN ALL 29-30-00
Page 11
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
Purpose
The standby hydraulic system reservoir low quantity switch
monitors low fluid level in the standby hydraulic system
reservoir.
Location
The quantity switch is on the top of the standby hydraulic
system reservoir in the main landing gear wheel well.
Physical Description
The standby hydraulic system reservoir low quantity switch is a
magnetic reed switch.
Functional Description
The mechanical float moves up and down on the surface of the
fluid in the reservoir. The float operates a magnetic reed switch.
The reed switch sends a signal when the fluid level is less than
50%. The signal goes to the standby hydraulic LOW QUANTITY
amber light on the flight control panel.
HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - STBY HYD SYS RESERVOIR LOW QTY SWITCH
EFFECTIVITY
GUN ALL 29-30-00
Page 12
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-005
HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - STBY HYD SYS RESERVOIR LOW QTY SWITCH
HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - STBY HYD SYS RESERVOIR LOW QTY SWITCH
EFFECTIVITY
GUN ALL 29-30-00
Page 13
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-005
General
Quantity transmitters on hydraulic system A and B reservoirs
measure hydraulic fluid quantity.
Quantity Transmitters
These transmitters send signals to the display electronics units
(DEUs). The fluid quantity then shows on the systems display.
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
which monitors for low fluid quantity in the system B reservoir.
Hydraulic System Quantity Indication
The quantity transmitters send signals for quantities between
empty and overfill (106 percent). Both quantity transmitters send
signals to both DEUs.
The quantity information shows as a percent of full on the
systems display above the pressure indication for hydraulic
systems A and B.
When the quantity in a reservoir is less than 76 percent, a white
RF message shows on the display adjacent to the quantity
indication. The RF message can show only when the airplane is
on the ground and either the trailing edge flaps are retracted or
both engines are not running.
System B Quantity Transmitter Low Quantity Switch
The low quantity switch in the system B transmitter opens when
the quantity is less than 21 percent. This switch is used for the
alternate nose wheel steering system.
See the nose wheel steering system section for more
information on the alternate nose wheel steering system.
(SECTION 32-51)
HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - FUNCTIONAL DESCRIPTION - MAIN HYD SYS
EFFECTIVITY
GUN ALL 29-30-00
Page 14
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-008
HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - FUNCTIONAL DESCRIPTION - MAIN HYD SYS
HYD INDICATING SYS - HYD FLUID QTY INDICATING SYS - FUNCTIONAL DESCRIPTION - MAIN HYD SYS
EFFECTIVITY
GUN ALL 29-30-00
Page 15
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-008
General
A standby hydraulic system reservoir low quantity switch
monitors the quantity of hydraulic fluid in the standby hydraulic
system reservoir. The flight control panel in the flight
compartment shows low hydraulic fluid quantity with a
standby hydraulic LOW QUANTITY amber light.
Standby Hydraulic System Reservoir Low Quantity Indication
The standby hydraulic system reservoir low quantity switch
closes and supplies a ground when the fluid quantity in the
standby hydraulic reservoir is less than 50%. This lets 28v dc
from bus 2 go through the master dim and test system to the
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