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and HYD light go off when the hydraulic pressure increases to
more than 1600 psi.
The ground from the pressure switches also sends a signal to
the flight data acquisition unit (FDAU).
See the Flight Data Recording System (FDRS) section for more
information on the flight data acquistion unit. (SECTION 31-31)
Training Information Point
NOTE: If you stop the respective EDP when the EMDP is on, it
is possible the HYD PUMP LOW PRESSURE light for the
EDP will not come on for two minutes or more because
hydraulic pressure is trapped in the line between the
EDP and the pressure module.
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - FUNCTIONAL DESCRIPTION - MAIN HYD SYS
EFFECTIVITY
GUN ALL 29-30-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-010
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - FUNCTIONAL DESCRIPTION - MAIN HYD SYS
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - FUNCTIONAL DESCRIPTION - MAIN HYD SYS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-010
General
A pressure switch monitors the pressure of the electric motordriven
pump (EMDP) in the standby hydraulic system. This
switch sends a signal to the STANDBY HYD LOW PRESSURE
light on the flight control panel.
Pump Pressure Switch
The pump pressure switch on the standby module monitors the
pressure of the EMDP.
Hydraulic Pump Pressure Indication
The pump pressure switch closes and supplies a ground when
the EMDP pressure decreases to less than 1300 psi.
The STANDBY HYD LOW PRESSURE amber light comes on
when pressure decreases and one of these conditions occur:
* Either FLT CONTROL switch is in the STBY RUD position
* Auto standby system relay is energized
* ALTERNATE FLAPS arm switch is in the ARM position.
The ground from the pressure switch also causes the MASTER
CAUTION light and FLT CONT light on the system annunciator
panel to come on. These lights come on when any of the amber
lights on the flight control panel come on.
The STANDBY HYD LOW PRESSURE light, the MASTER
CAUTION light and the FLT CONT light go off when the EMDP
pressure increases to more than 1600 psi.
The ground from the pressure switch also sends a signal to the
flight data acquisition unit (FDAU).
See the Flight Data Recording System (FDRS) section for more
information on the flight data acquisition unit. (SECTION 31-31)
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - FUNCTIONAL DESCRIPTION - STBY HYD SYS
EFFECTIVITY
GUN ALL 29-30-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-011
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - FUNCTIONAL DESCRIPTION - STBY HYD SYS
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - FUNCTIONAL DESCRIPTION - STBY HYD SYS
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 29-30-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-30-00-011
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - FUNCTIONAL DESCRIPTION - STBY HYD SYS
HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - FUNCTIONAL DESCRIPTION - STBY HYD SYS
EFFECTIVITY
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HYD INDICATING SYS - HYD PUMP LOW PRESSURE WARNING SYS - FUNCTIONAL DESCRIPTION - STBY HYD SYS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The hydraulic fluid overheat warning switch monitors the
temperature of the electric motor-driven pumps (EMDPs) in
the hydraulic systems A and B.
Location
The hydraulic fluid overheat warning switch is in the case drain
line between the related EMDP and case drain filter module in
the main landing gear wheel well.
Physical Description
The hydraulic fluid overheat warning switch is a temperature
　
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