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General
Hydraulic System Test
Full System Test
Component Check
TMUHYDW01 LEVEL 3
EFFECTIVITY 29-19-00 Page 1
Oct 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 63
ALL
LEAKAGE MEASUREMENT SYSTEM PRESENTATION
The yellow system has been chosen as an example.
GENERAL
The return flow of a hydraulic system is equal to the
user’s demand flow plus the permanent internal leakage.
Note: Even with users at neutral, there is a permanent
flow. If the permanent flow is too high the
corresponding system operation will be affected.
The flight controls users are permanently supplied
through Leak Measurement Valves. These valves have to
be closed during leak hydraulic system test.
Internal leakage (full system check) is measured for
each group of users through manually operated shut-off
valves.
HYDRAULIC SYSTEM TEST
To test a complete hydraulic system, a hydraulic ground
cart equipped with a flow meter has to be used to
pressurize the circuit.
Precautions: Before starting the test make sure that
all servocontrols are in their neutral
position and that the spoilers are
retracted. Do not forget to disconnect
the isolation coupling of the PTU to
prevent inadvertent pressurization of
the green system by the PTU.
The internal leakage flow rate is indicated by the
flow meter.
If the flow rate is too high, a full system check has
to be carried out to find out the faulty group of
hydraulic users (RH wing, LH wing, Tail section,
Central section).
TMUHYDW01-T01 LEVEL 3
EFFECTIVITY 29-19-00 Page 2
Oct 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 64
ALL
TMUHYDW01-P01 LEVEL 3
LEAKAGE MEASUREMENT SYSTEM PRESENTATION
EFFECTIVITY 29-19-00 Page 3
Oct 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 65
ALL
LEAKAGE MEASUREMENT SYSTEM PRESENTATION
FULL SYSTEM CHECK
Once the hydraulic system is pressurized from the
ground cart, make sure that the ELAC’s, SEC’s and
FAC2 are set to ON to supply the hydraulic users.
The Flight Controls surfaces must be kept in the
neutral position.
Note: The internal leakage check has to be done with
the hydraulic fluid at its normal working
temperature.
The full system check is carried out by checking
successively the four sections of the hydraulic system
with the corresponding Leakage Measurement Valve in
the closed position.
The indicated flow must be compared to the theoretical
one and if the flow is over the limit the failed
component belongs to this group of users.
COMPONENT CHECK
Each type of hydraulic component has a maximum
permitted internal leakage limit.
Note: The total leakage of the components within a
section must be less than the permitted maximum
for that section. All together, the total
leakages of the sections must not be more than
the leakage permitted for the complete system.
If the internal leakage is too high, the faulty
component must be identified and replaced.
High leakage rate causes an increase of component
temperature.
If a servocontrol is considered to be faulty, it must
be disconnected and the corresponding hydraulic
section rechecked.
If the internal leakage rate is now within the limits,
the servocontrol is confirmed as defective.
TMUHYDW01-T02 LEVEL 3
EFFECTIVITY 29-19-00 Page 4
Oct 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 66
ALL
LEAKAGE MEASUREMENT SYSTEM PRESENTATION
TMUHYDW01-P02 LEVEL 3
EFFECTIVITY 29-19-00 Page 5
Oct 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 67
ALL
THIS PAGE LEFT INTENTIONALLY BLANK
TMUHYDW01 LEVEL 3
EFFECTIVITY 29-19-00 Page 6
Oct 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 68
ALL
29 - HYDRAULIC POWER
29-14-00 HYDRAULIC RESERVOIR PRESSURIZING
SYSTEM D/O
CONTENTS:
General
Sources
Restrictor
Reservoir Pressurization Unit
Pressure Reducing Valve
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