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

TASK 29-12-00-710-002-A
Operational Test of the Phase Unbalance Detector and the Current Transformer of the Blue Hydraulic System

FIN: 2706GJ
FIN: 2707GJ

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
Phase Unbalance Detector

3. Job Set-up
Subtask 29-12-00-865-051-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
123VU	B HYD/ELEC PUMP	2701GJ	AB09

Subtask 29-12-00-010-050-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 29-12-00-860-052-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 switch (P/BSW). Make sure that the HYD page is shown on the ECAM lower DU.
(4) Make sure that the ECAM does not show any of these conditions:

Low air pressure in the Blue reservoir,
Low fluid level in the Blue 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).
(7) On the overhead panel 40VU, make sure that the BLUE/ELEC PUMP P/BSW is set to AUTO (FAULT and OFF legends not on).

4. Procedure
Subtask 29-12-00-710-051-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 panel 50VU: push the BLUE PUMP OVRD P/BSW.	On panel 50VU: the ON legend of the BLUE PUMP OVRD P/BSW comes on.
	The electric pump of the Blue hydraulic system starts.
	On the ECAM lower DU: the BLUE hydraulic system is pressurized to approximately 3000 psi.
2.On the phase unbalance detector: press and hold the TEST P/B.	On the phase unbalance detector: the test indicator light comes on. The electric pump of the Blue hydraulic system stops. On the overhead panel 40VU: the BLUE ELECT PUMP/FAULT light comes on. On the ECAM lower DU: the pressure in the BLUE system is shown as 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 the overhead panel 40VU: push the BLUE ELEC PUMP P/BSW.	On the overhead panel 40VU: the OFF light of the BLUE ELEC PUMP P/BSW comes on. On the overhead panel 50VU: the ON light of the BLUE PUMP OVRD P/B goes out. On the phase unbalance detector: the test indicator light goes out.
5.On the overhead panel 40VU: push and release the BLUE ELEC PUMP P/BSW.	On the overhead panel 40VU: the OFF light of the BLUE ELEC PUMP P/BSW goes out.
6.On the overhead panel 50VU: push the BLUE PUMP OVRD P/B.	On the overhead panel 50VU: the ON light of the BLUE PUMP OVRD P/B comes on. The electric pump of the Blue hydraulic system starts to operate. On the lower DU of the ECAM: the pressure in the Blue hydraulic system is 3000 psi approximately, the color of the system name changes from amber to white.
7.On the overhead panel 40VU: push the BLUE ELEC PUMP P/BSW.	On the overhead panel 40VU: the OFF light of the BLUE ELEC PUMP P/BSW comes on. On the overhead panel 50VU: the ON light of the BLUE PUMP OVRD goes off. The electric pump of the Blue hydraulic system stops.

5. Close-up
Subtask 29-12-00-860-053-A

A. Put the aircraft back to the serviceable condition.
(1) On the overhead panel 40VU, push the BLUE ELEC PUMP P/BSW. Make sure that the OFF and FAULT legends are out.
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 29-12-00-410-050-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 00:18:49 UTC