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ground.
SYSTEM ACCUMULATORS
Applicable to: ALL
An accumulator in each system helps to maintain a constant pressure by covering transient demands
during normal operation.
LOAD ALLEVIATION FUNCTION (LAF) ACCUMULATORS
Applicable to:
Four additional accumulators perform the load alleviation function. These accumulators (one for the
green system and one for the yellow system on each wing) maintain the required pressure during
high-rate operations of the various movable wing surfaces.
PRIORITY VALVES
Applicable to: ALL
Priority valves cut off hydraulic power to heavy load users if hydraulic pressure in a system gets low.
FIRE SHUTOFF VALVES
Applicable to: ALL
Each of the green and yellow systems has a fire shutoff valve in its line upstream of its engine-driven
pump. The flight crew can close it by pushing the ENG 1(2) FIRE pushbutton.
LEAK MEASUREMENT VALVES
Applicable to: ALL
Each system has a leak measurement valve upstream of the primary flight controls.
These valves, which measure the leakage in each circuit, are closed by operation of the LEAK
MEASUREMENT VALVES pushbutton switch on the maintenance panel.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A318/A319/A320/A321 FLEET DSC-29-10-20 P 3/8
FCOM 19 AUG 10
FILTERS
Applicable to: ALL
L3 Filters clean the hydraulic fluid as follows :
HP filters on each system and on the reservoir filling system ‐ and the normal braking system
‐ return line filters on each line
‐ case drain filters on engine pumps and the blue electric pump (which permit maintenance to
monitor engine wear by inspecting the filters for the presence of metallic particles).
GENERATION
Applicable to: ALL
RESERVOIR PRESSURIZATION
Applicable to: ALL
Normally, HP bleed air from engine 1 pressurizes the hydraulic reservoirs automatically.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A318/A319/A320/A321 FLEET DSC-29-10-20 P 4/8
FCOM 19 AUG 10
If the bleed air pressure is too low, the system takes bleed air pressure from the crossbleed duct.
The systems maintain a high enough pressure to prevent their pumps from cavitating.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A318/A319/A320/A321 FLEET DSC-29-10-20 P 5/8
FCOM 19 AUG 10
INDICATIONS
Applicable to:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A318/A319/A320/A321 FLEET DSC-29-10-20 P 6/8
FCOM 19 AUG 10
Note: Only the blue system has a second pressure switch on the blue reservoir to trigger the
“BLUE RSVR” ECAM message, when air pressure in the reservoir drops below 45 PSI.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A318/A319/A320/A321 FLEET DSC-29-10-20 P 7/8
FCOM 19 AUG 10
INDICATIONS
Applicable to:
,
,
MSN,,,,
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - GENERATION
A318/A319/A320/A321 FLEET DSC-29-10-20 P 8/8
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - DISTRIBUTION
A318/A319/A320/A321 FLEET DSC-29-10-30 P 1/6
FCOM 19 AUG 10
DISTRIBUTION
Applicable to:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - DISTRIBUTION
A318/A319/A320/A321 FLEET DSC-29-10-30 P 2/6
FCOM 19 AUG 10
DISTRIBUTION
Applicable to:
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - DISTRIBUTION
A318/A319/A320/A321 FLEET DSC-29-10-30 P 3/6
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - DISTRIBUTION
A318/A319/A320/A321 FLEET DSC-29-10-30 P 4/6
FCOM 19 AUG 10
DISTRIBUTION
Applicable to:
,
,
MSN,,
4538,,
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - DISTRIBUTION
A318/A319/A320/A321 FLEET DSC-29-10-30 P 5/6
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
HYDRAULIC
DESCRIPTION - DISTRIBUTION
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-29-10-30 P 6/6
　
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