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* bat - battery
* clsd - closed
* cont - control
* CT - current transformer
* dc - direct current
* EDP - engine-driven pump
* ELCU - electrical load control unit
* elec - electrical
* elev - elevator
* EMDP - electric motor-driven pump
* eng - engine
* exch - exchanger
* fwd - forward
* GPM - gallons per minute
* hyd - hydraulic
* flt - flight
* gnd - ground
* kg - kilograms
* kts - knots
* LE - leading edge
* lt - left
* MLG - main landing gear
* NLG - nose landing gear
* norm - normal
* press - pressure
* psi - pounds per square inch
* PTU - power transfer unit
* qty - quantity
* rt - right
* rud - rudder
* stby - standby
* sw - switch
* sys - system
* TE - trailing edge
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* vlv - valve
* xfr - transfer
* xmfr - transformer
* xmtr - transmitter
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HYDRAULIC POWER - INTRODUCTION
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Pressurization
Air pressure from the reservoir pressurization system
maintains head pressure on hydraulic system A, system B,
and the standby hydraulic system reservoirs.
The pressurized reservoirs supply a constant flow of fluid to the
hydraulic pumps.
Hydraulic System A
Hydraulic system A supplies pressure to these airplane
systems:
* Power transfer unit motor
* Left thrust reverser
* Landing gear extension and retraction
* Nose wheel steering
* Alternate brakes
* Aileron
* Autopilot A
* Elevators
* Elevator feel
* Flight spoilers 2, 4, 9, and 11
* Ground spoilers 1, 6, 7, and 12
* Rudder.
Hydraulic System B
Hydraulic system B supplies pressure to these airplane
systems:
* Right thrust reverser
* Alternate landing gear retraction
* Alternate nose wheel steering
* Normal brakes
* Aileron
* Autopilot B
* Elevators
* Elevator feel
* Flight spoilers 3, 5, 8, and 10
* Rudder
* Trailing edge flaps
* Leading edge flaps and slats.
Standby Hydraulic System
The standby hydraulic system supplies alternative hydraulic
pressure to these airplane systems:
* Both thrust reversers
* Standby rudder
* Leading edge flaps and slats.
Hydraulic Power Transfer Unit (PTU) System
The PTU system is a hydraulic motor-pump assembly that
supplies alternative pressure to leading edge flaps and slats
and autoslat system if system B is de-pressurized. The PTU is
controlled by the PTU control valve.
System A pressurizes the motor when the PTU control valve is
open. System B supplies the fluid to the pump.
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These are the hydraulic indications in the flight deck for
hydraulic systems A and B:
* Quantity
* System pressure
* Pump low pressure
* Overheat (EMDPs only)
* Master Caution.
GUN 001-005, 201-999 PRE SB 737-27-1253
These are the indications for the standby hydraulic system:
* Low quantity
* Low pressure.
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB
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