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S
PRESSURE
SWITCH
PRESSURE
FILTER
MANIFOLD
PRESSURE
TRANSDUCER
15-MICRON
PRESSURE
FILTER
RETURN
FILTER
MANIFOLD
PRV
FIREWALL
SHUTOFF
VALVE
RETURN
QUICK-DISCONNECT
PRESSURE
RELIEF
VALVE
PRESSURE
SWITCH
LEFT
HYDRAULIC
SYSTEM
PRIORITY VALVE
PRESSURE
QUICK-DISCONNECT
QUANTITY GAUGE
VISUAL AND ELECTRICAL
PRESSURE
SWITCH
C
P
S
DCMP
FILL QUICK
DISCONNECT
HYDRAULICS
Volume 2 Flight Crew Operating Manual May 06/2005
13-01-06 CSP 100-6 REV 2
LEFT AND RIGHT HYDRAULIC SYSTEM (Cont)
RIGHT HYDRAULIC SYSTEM SCHEMATIC
SUPPLY PRESSURE (P)
SUCTION PRESSURE (S)
RETURN PRESSURE (R)
CASE DRAIN (C)
ECOLOGY
LEGEND
EDP
P S C
TEMPERATURE
TRANSDUCER
TEMPERATURE
SWITCH
RESERVOIR
525 CU IN
(8603 CU CM)
BRV
ECOLOGY
BOTTLE
5-MICRON
RETURN
FILTER
BLEED/
RELIEF
VALVE
15-MICRON
CASE DRAIN
FILTER
15-MICRON
CASE DRAIN
FILTER
FUEL/OIL HEAT
EXCHANGER
FUEL TANK
HEAT-EXCHANGER
BYPASS VALVE
ALTN FLAPS
VALVE
FLAPS
BRV
PTU
MOTOR
PTU
PUMP
C
P
PRESSURE
TRANSDUCER
15-MICRON
PRESSURE
FILTER
RETURN
FILTER
MANIFOLD
PRV
FIREWALL
SHUTOFF
VALVE
RETURN
QUICK-DISCONNECT
PRESSURE
RELIEF
VALVE
PRESSURE
SWITCH
PRESSURE
QUICK-DISCONNECT
QUANTITY GAUGE
VISUAL AND ELECTRICAL
C
P
S
DCMP
SWITCHING
VALVE
LOWER
RUDDER
PRESSURE
SWITCH
PRESSURE
FILTER
MANIFOLD
BALANCED
RELIEF VALVE
PTU
SELECT VALVE
FILL QUICK
DISCONNECT
LEFT AND RIGHT
OUTBOARD ELEVATORS
OUTBOARD
GROUND SPOILERS
OUTBOARD
BRAKES
MAIN LANDING
GEAR ASSIST
AUXILIARY HYDRAULIC
SYSTEM (ALTERNATE)
LEFT HYDRAULIC
SYSTEM (ALTERNATE)
RIGHT
THRUST REVERSER
OUTBOARD
MULTIFUNCTION
FLIGHT-SPOILERS
HYDRAULICS
May 06/2005 Flight Crew Operating Manual Volume 2
REV 2 CSP 100-6 13-01-07
AUXILIARY HYDRAULIC SYSTEM
DESCRIPTION
The purpose of the auxiliary hydraulic system is to provide hydraulic pressure to the lower rudder PCU as a result of the
right hydraulic system failure. The auxiliary hydraulic system includes a DCMP, a reservoir, and an accumulator, all located
aft of the engine rotor burst zone. The right hydraulic system normally powers the lower rudder PCU. During a loss of right
system pressure, a hydraulic switching valve allows the auxiliary system to provide pressure to the lower rudder PCU. The
left or right hydraulic system may be activated without the system already being pressurized. However, the auxiliary system
has an intensifier pressurized by the right hydraulic system. During the preflight check, select R PUMP ON before selecting
AUX PUMP to AUTO to prevent cavitation.
The auxiliary hydraulic system pressure is generated by a constant displacement DCMP. The pump is controlled by a two
position AUX PUMP switch. The OFF position disables the pump. In the AUTO position, a pressure switch allows the
pump to activate as needed.
COMPONENTS AND OPERATION
AUXILIARY DC MOTOR-DRIVEN PUMP
The auxiliary DCMP function is to maintain fluid pressure on the auxiliary system accumulator. When the system pressure
decreases to 2500 psi, an external pressure switch turns on the pump until pressure has reached 3350 psi. At that time, the
pressure switch deactivates, commanding the pump off.
AUXILIARY HYDRAULIC SYSTEM ACCUMULATORS AND RESERVOIR
The auxiliary system accumulator has a nominal gas volume for 50 cubic inches of dry nitrogen, to satisfy the instantaneous
demands of the hydraulic pressure and dampen out pressure surges with in the system. The pre-charge pressure versus temperature
is set so that when the accumulator is discharged, the accumulator will still have sufficient oil for a smooth continuous
operation of the lower rudder as the pump comes on line at approximately 2500 psi.
The auxiliary system uses an intensifier to augment the inlet pressure to the auxiliary DCMP to prevent pump cavitation.
The intensifier is a simple spring-loaded piston that transmits pressure from the RH system to the pressure side of the auxiliary
system reservoir. The DC pumps will come on prior to the engines starting and supply the intensifier with pressure.
　
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