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1 and 2.
LEAK MEASUREMENT VALVE
The leak measurement valve isolates the flight controls
when the guarded LEAK MEASUREMENT VALVES pushbutton
on the maintenance panel is set to OFF.
The solenoid valve is automatically closed if the
yellow electric pump is energized by using cargo door
selectors. This is to prevent any movement of the
flight controls.
HP FILTER
The High Pressure filter is equipped with a clogging
indicator.
The clogging indicator operates when the differential
pressure is higher than 87 ± 8.7 psi (6  ± 0.6 bar).
ACCUMULATOR
The accumulator acts as a damper for small changes.
It also makes a supply of fluid available in case of
any demand.
The accumulator is precharged with nitrogen to 1885
psi (130 bar) at 20°C. It holds 1.1l (0.29 USgal) of
total volume of fluid when it is full.
SAMPLING VALVE
A sampling valve is provided on the HP manifold.
PRESSURE RELIEF VALVE
The pressure relief valve connects the high pressure
circuit to the return circuit in case of overpressure.
The relief valve opens at 3436 psi (237 bar) and closes
at 3190 psi (220 bar).
TMUHYDD04-T03 LEVEL 3
EFFECTIVITY 29-13-00 Page 6
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 58
ALL
YELLOW HYDRAULIC SYSTEM D/O
TMUHYDD04-P03 LEVEL 3
EFFECTIVITY 29-13-00 Page 7
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 59
ALL
YELLOW HYDRAULIC SYSTEM D/O
LEAK MEASUREMENT MANIFOLD
The leak measurement valve block supplies the flight
controls of the right hand wing, left hand wing and
tail section via three separate outputs.
Opening a spool valve allows the associated section
of the flight controls to be supplied for leak
measurement test.
PTU MANIFOLD
QUICK DISCONNECT
The quick disconnect is used for maintenance operations
to prevent Power Transfer Unit operation.
PRIORITY VALVE
The priority valve makes sure that all available
hydraulic pressure is sent to the primary flight
controls if pressure in the system is reduced.
SOLENOID VALVE
The solenoid valve, installed in the Power Transfer
Unit supply line, stops the Power Transfer Unit
operation.
RETURN MANIFOLD
The return manifold comprises:
- a return filter equipped with a clogging
indicator.
- a temperature switch and two temperature
transducers.
The bypass operates when the differential pressure across
the filter is more than 29 ± 2.35 psi (2 ± 0.16 bar).
Temperature switch and probes send data to the ECAM
for indication and warnings.
TMUHYDD04-T04 LEVEL 3
EFFECTIVITY 29-13-00 Page 8
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 60
ALL
YELLOW HYDRAULIC SYSTEM D/O
TMUHYDD04-P04 LEVEL 3
EFFECTIVITY 29-13-00 Page 9
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 61
ALL
SELF EXAMINATION
When is the Engine Driven Pump in the depressurized
mode?
A - When the ENG 2 PUMP pushbutton is set to
OFF.
B - The engine pump cannot be depressurized
as long as the engine is running.
C - The engine pump is automatically
depressurized if the output pressure
drops below 1450 psi.
How can the LH wing be supplied independently
during leak measurement test?
A - By setting the leak measurement valve to
OFF and operating the electric pump
B - By pressurizing the yellow system by
using the PTU.
C - By setting the leak measurement valve to
OFF and manually open the LH wing spool
valve.
What can the hand pump be used for?
A - To pressurize the reservoir.
B - To check the flight controls.
C - To operate the cargo doors.
During which operation is the leak measurement
valve closed automatically?
A - PTU operation.
B - Cargo door operation.
C - Hand pump operation.
TMUHYDD04 LEVEL 3
EFFECTIVITY 29-13-00 Page 10
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 62
ALL
29 - HYDRAULIC POWER
29-19-00 LEAKAGE MEASUREMENT SYSTEM
PRESENTATION
CONTENTS:
　
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