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flight control panel and turn on the STANDBY HYD LOW
QUANTITY light.
The ground from the switch also causes the MASTER CAUTION
light and the 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 ground from the 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)
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
System pressure transmitters for hydraulic systems A and B
send pressure information to the flight compartment.
location
The hydraulic systems A and B pressure transmitters are on the
hydraulic systems A and B pressure modules in the main
landing gear wheel well forward bulkhead.
Physical Description
Each hydraulic system pressure transmitter is a sealed
assembly with a piston, disc spring and electrical switch.
The system pressure transmitters are interchangeable.
Functional Description
The system transmitters send pressure data to the lower center
common display unit systems display between 0 and 4000 psi.
Training Information Point
The pressure settings of the pressure transmitters are not
adjustable.
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General
Pressure transmitters monitor the pressure of hydraulic
systems A and B. These transmitters send signals to the
electroncis display unit (DEU). The DEU sends signals to the
lower center common display unit (CDU) and shows on the
systems display in the flight compartment.
System Pressure Transmitters
Pressure transmitters on each hydraulic systems A and B
pressure modules measure system pressure. System pressure
is the combined output from both the engine-driven pump
(EDPs) and the electric motor-driven pump (EMDPs).
Hydraulic System Pressure Indication
The pressure transmitters send signals for pressures between
0 and 4000 psi. The system A transmitter sends a signal to the
display electronics unit 1. The system B transmitter sends a
signal to the display electronics unit 2.
Each display electronics unit receives the signal from the
pressure transmitters and sends this data to the systems
display. The pressure is shown in psi units.
The pressure indications are shown by digital numbers colored
white. These numbers are shown inside a rectangular outline
label (HYDRAULIC) and colored in cyan. System, quantity and
　
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