LOSS OF THE SYSTEM PR. OF THE G/Y HYDRAULIC SYSTEM

Hydraulic Loss from Green/ Yellow system or RSVR LO LEVEL ECAM Warning followed by G/Y ENG PUMP LO PR

Follow TSM TASK 52-36-00-810-805-A

AND

29-13-00-810-805 & FOR THE LOSS OF CORRECT QTY IN THE HYDRAULIC RESERVOIR

29-13-00-810-801

Apart from other possible causes,leakage from union,packing and Hyd line puncture are common.Find out the reason and do the related troubleshooting.

Once this is done must find out and eliminate the causes of possible pump cavitation.

Do the following necessary steps:-

TASK 29-00-00-280-006-A01

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 P/BSW on the Eng/APU fire panel), or

‌When the engine pump operates with no fluid in the reservoir (ECAM HYD system page).

‌This procedure can also apply if there is a indication of particles (from a defective EDP) released in the system (e.g. indication found during troubleshooting or while examine pump low pressure or overheat).

NOTE:

Two procedures are included here to do a check after an engine pump operation for more than 10 minutes in a possible cavitation condition. Each procedure is applicable for a different set of conditions. Only do the procedure that is applicable for the conditions you find.

(1)

Do the subsequent procedure if the engine pump has operated for more than 10 minutes:

With a closed engine pump fire-valve, or

With no fluid in the reservoir (ECAM HYD system page) or RSVR LO LVL warning on the upper ECAM DU and unknown fluid level.

There are no time limits if:
The engine pump is set to OFF (ENG 1 (2) PUMP FAULT/OFF P/BSW on panel 40VU), with
The engine pump fire-valve open and there is fluid in the reservoir.

(a)Check filter DPI for extension of the hydraulic control unit of the thrust reverser,
HP filter,
case drain filter and
LP filter.

If DPI extended;Replace the filter element of the related unit.

(b)Replace the related engine pump.

Do the operational test of the related hydraulic system with Engine run.During the test, move the flight control surfaces to supply fluid flow for 10 mintes.

Do a check for DPIs extension, filter elements and filter bowls of the hydraulic control unit filter, HP filter, case drain filter and LP filter of the related system.

If you find a DPI extended or abnormal particles: Replace the filter element of the related unit.

(c)Replace the case-drain filter element

With an open engine pump fire-valve, and

With fluid in the reservoir (index above the minimum gageable level on the ECAM HYD system page) although the RSVR LO LVL warning on the upper ECAM DU.

(a)Do a check for particles:
In the filter bowl and the filter of the hydraulic control unit of the thrust reverser.
In the case-drain filter bowl and the filter of the related engine pump
In the HP filter bowl and the filter of the related system.

(b)If you find particles:
Do the steps (1) (a) thru (c) of this procedure.

(c)If you do not find particles:

Do the operational test of the related hydraulic system.

(2)During the test, slowly move one flight control surface at a time.
(3)Make sure that the system pressure is more than 2800 psi (193.1 bar) during the test.

(d)If the system pressure is less than 2800 psi (193.1 bar) during the test:

1Do the step 1 (a). through (c)

Regards,
-pramodara