4. Fault Isolation
_______________
A. If the fault confirmation gives:
- a system pressure indication of 2750 psi on the lower ECAM DU:
(1) On panel 50VU, set the HYD/LEAK MEASUREMENT VALVES/Y pushbutton switch to on (OFF light not on).
(a) If the system pressure increases:
(b) If the system pressure does not increase: 1 Pressurize the Yellow hydraulic system with the electric pump
1_ Stop the dry-motoring of the right (No. 2) engine.
2_ do a check of the internal leakage of the Yellow hydraulic
system (Ref. AMM TASK 29-00-00-280-003) and do the necessary
actions.
_ (Ref. AMM TASK 29-24-00-863-001).
2 Look for the system pressure indication on the lower ECAM DU.
_
(c) If the system pressure increases to more than 2750 psi: 1 Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-24-
_ 00-864-001).
2 Replace the PUMP-Y, ENG 2 (3030GD) (Ref. AMM TASK 29-13-51-
_ 000-004) and (Ref. AMM TASK 29-13-51-400-004).
3 Do a check of the engine pump for a possible cavitation
_ condition (Ref. AMM TASK 29-00-00-280-006).
NOTE : A cavitation condition of the engine pump is possible
____ when the engine pump operates with the engine pump fire valve closed (if you set the ENG 1 (2) FIRE pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
(d) If the fault continues, obey the subsequent causes:
- The internal leakage in the Yellow hydraulic system is a bit higher than usual (special for older A/C).
- There is an additional ECAM tolerance of +/- 50psi, the system pressure indication on the ECAM is in 50 psi steps.
B. Do the fault confirmation procedure as given in Para. 3. to make sure that operation is correct.
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CES 5. Close-up
________
A. Put the aircraft back to the serviceable condition.
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
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CES
TASK 29-13-00-810-811
Yellow Reservoir Pressure is out of Tolerance
1. Possible Causes
_______________
- PRESSURE REDUCING VALVE
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s)
No specific warning notices
B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 12-32-29-281-001 Hydraulic Fluid Sample of Green,Blue and Yellow Systems for Analysis AMM 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action AMM 29-14-00-720-001 Functional Test of the Pressurizing System of the
Hydraulic Reservoirs
AMM 29-14-43-000-001 Removal of the Pressure Reducing Valve
AMM 29-14-43-400-001 Installation of the Pressure Reducing Valve
AMM 32-12-00-010-001 Open the Main Gear Doors for Access
3. Fault Confirmation
__________________
A. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU HYD/HYD PWR/B WARN/& CTL 2702GJ C12 121VU HYDRAULIC/HYD POWER/Y 3803GX N30 123VU B HYD/ELEC PUMP 2701GJ AB09 123VU Y HYD/ELEC/PUMP 3802GX AB06 123VU Y HYD/ELEC/ELEC PUMP/NORM 3801GX AB03
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B. Aircraft Maintenance Configuration 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 液压(71)
