W DOC AIRBUS | AMM A320F

Operational Test of the Phase Unbalance Detector and the Current Transformer of the Yellow Hydraulic System

TASK 29-24-00-710-002-A
Operational Test of the Phase Unbalance Detector and the Current Transformer of the Yellow Hydraulic System

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
FIN: 3807GX
FIN: 3808GX
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
822
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 12-12-29-611-001-A
Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A
De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01
De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02
De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-14-00-614-002-A
Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01
Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 31-60-00-860-001-A
EIS Start Procedure
TASK 31-60-00-860-002-A
EIS Stop Procedure
TASK 52-41-00-010-002-A
Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A
Close the Avionics Compartment Doors after Access
F Phase Unbalance Detector
3. Job Set-up
Subtask 29-24-00-865-052-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN30
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN31
** ON A/C ALL
123VUY HYD/ELEC/PUMP3802GXAB06
123VUY HYD/ELEC/ELEC PUMP/NORM3801GXAB03
Subtask 29-24-00-010-051-A
B. Get Access
   (1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the access door 822.
   (2) Open the access door 822 (Ref. AMM TASK 52-41-00-010-002).
Subtask 29-24-00-860-056-A
C. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
   (2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
   (3) On the ECAM control panel on the center pedestal, press the HYD pushbutton (P/B). Make sure that the HYD page is shown on the ECAM lower Display Unit (DU).
   (4) Make sure that the ECAM system does not show one of these conditions:
  • Low air pressure in the Yellow reservoir,
  • Low fluid level in the Yellow reservoir.
   (5) If necessary, pressurize the reservoir (Ref. AMM TASK 29-14-00-614-002).
   (6) If necessary, add fluid to the reservoir (Ref. AMM TASK 12-12-29-611-001).
4. Procedure
Subtask 29-24-00-710-051-A
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
A. Do this test:
ACTION
RESULT
1.On overhead panel 40VU:
  • push the YELLOW ELEC PUMP pushbutton switch (P/BSW).
On overhead panel 40VU:
  • the ON legend of the YELLOW ELEC PUMP P/BSW comes on.

    The electric pump of the Yellow hydraulic system starts.

    On the ECAM lower DU:
  • the pressure of the YELLOW hydraulic system is approximately 3000 psi.
2.On the phase unbalance detector:
  • push and hold the TEST P/B.
On the phase unbalance detector:
  • the test indicator light comes on.

    The electric pump of the Yellow hydraulic system stops.

    On the overhead panel 40VU:
    - the YELLOW ELEC PUMP/FAULT light comes on.

    On the ECAM lower DU:
    - the pressure of the YELLOW hydraulic system is 0 psi.
  • the color of the system name changes from white to amber.
3.On the phase unbalance detector:
  • release the TEST P/B.
On the phase unbalance detector:
  • the test indicator light stays on.
4.On overhead panel 40VU:
  • push and release the YELLOW ELEC PUMP P/BSW.
On the overhead panel 40VU:
  • the ON/FAULT light of the YELLOW ELEC PUMP P/BSW goes off.

    On the phase unbalance detector:
  • the test indicator light goes off.
5.On overhead panel 40VU:
  • push the YELLOW ELEC PUMP P/BSW.
On the overhead panel 40VU:
  • the ON light of the YELLOW ELEC PUMP P/BSW comes on.

    The electric pump of the Yellow hydraulic system starts to operate.

    On the lower DU of the ECAM:
  • the pressure in the Yellow hydraulic system is 3000 psi approximately.
  • the color of the system name changes from amber to white.
6.On the overhead panel 40VU:
  • push the YELLOW ELEC PUMP P/BSW.
On the overhead panel 40VU:
  • the ON light goes off.

    The operation of the electric pump of the Yellow hydraulic system stops.
5. Close-up
Subtask 29-24-00-860-057-A
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).
Subtask 29-24-00-410-051-A
B. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the access door 822 (Ref. AMM TASK 52-41-00-410-002).
   (3) Remove the access platform(s).
[Rev.10 from 2021] 2026.04.01 00:26:57 UTC
"Aviabrain" 2025