DOC AIRBUS | AMM A320FPressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-863-001-A
Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 29-23-00-860-053-A
Subtask 29-23-00-863-052-A
Subtask 29-23-00-865-074-A
[Rev.10 from 2021]
2026.04.01 00:26:35 UTC
Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
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.
WARNING:
PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY HYDRAULIC POWER TO THE AIRCRAFT.
CAUTION:
DO NOT OPERATE THE ELECTRIC PUMP OR THE PTU IF THE SUPPLY OF HYDRAULIC FLUID IS NOT SUFFICIENT. MAKE SURE THAT THE RESERVOIRS HAVE SUFFICIENT AIR PRESSURE BEFORE YOU OPERATE THE PUMP/PTU.
NOTE: The simulation of in-flight conditions while Green and Yellow hydraulic systems are off can cause an inhibition of PTU. For data about the PTU function logic, refer to chapter SD 292300 00.
NOTE: You must know that the pressurizing of GREEN HYD SYS with PTU and Y EMP will not give you nominal hydraulic power and cause a pressure fluctuation in the hydraulic systems. Because of this, the systems can operate with less precision, less power and users can operate slower than necessary. For some systems, the flow rate of PTU is not sufficient to replace the hydraulic ground power cart.
FIN: 1088GM
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| 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 29-00-00-910-002-A | Safety Procedures of the Hydraulic System |
| 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 29-23-00-860-002-A | Connection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| TASK 31-60-00-860-001-A | EIS Start Procedure |
| TASK 32-12-00-010-001-A | Open the Main Gear Doors for Access |
ECAM Lower DU during Power TransferSubtask 29-23-00-860-053-A
A. Aircraft Maintenance Configuration
(2) Open the main doors of the main landing gear (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that the isolation coupling of the Power Transfer Unit (PTU) is connected (Ref. AMM TASK 29-23-00-860-002).
(4) Energize the electrical circuits (Ref. AMM TASK 24-41-00-861-002).
Subtask 29-23-00-865-073-A WARNING:
OBEY THE HYDRAULIC SAFETY PROCEDURES.
(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002). (2) Open the main doors of the main landing gear (Ref. AMM TASK 32-12-00-010-001).
(3) Make sure that the isolation coupling of the Power Transfer Unit (PTU) is connected (Ref. AMM TASK 29-23-00-860-002).
(4) Energize the electrical circuits (Ref. AMM TASK 24-41-00-861-002).
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 29-23-00-860-068-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | PTU INHIT/Y SYS | 1808GL | Q33 |
| 121VU | PTU INHIT/G SYS | 1807GL | Q32 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC / PTU FLT INHIB | 1825GL | Q31 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC-PTU FLT INHIT | 1825GL | Q32 |
C. Aircraft Maintenance Configuration
(1) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) (Ref. AMM TASK 31-60-00-860-001).
(2) 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.
(3) Make sure that the ECAM does not show any of these conditions:
(5) If necessary, add fluid to the reservoir (Ref. AMM TASK 12-12-29-611-001).
(6) On the panel 400VU make sure that the landing gear lever is in the DOWN position.
(7) On the panel 40VU make sure that the PTU P/BSW is set to AUTO.
Subtask 29-23-00-865-050-A (1) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) (Ref. AMM TASK 31-60-00-860-001).
(2) 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.
(3) Make sure that the ECAM does not show any of these conditions:
- Green or Yellow reservoir, low air pressure,
- Green or Yellow reservoir, low fluid contents.
(5) If necessary, add fluid to the reservoir (Ref. AMM TASK 12-12-29-611-001).
(6) On the panel 400VU make sure that the landing gear lever is in the DOWN position.
(7) On the panel 40VU make sure that the PTU P/BSW is set to AUTO.
D. Make sure that this(these) circuit breaker(s) is(are) closed:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N30 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC/HYD POWER/Y | 3803GX | N31 |
| ** ON A/C ALL | |||
| 123VU | Y HYD/ELEC/PUMP | 3802GX | AB06 |
| 123VU | Y HYD/ELEC/ELEC PUMP/NORM | 3801GX | AB03 |
Subtask 29-23-00-863-052-A
A. Pressurization of the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
(1) On the panel 40VU push the YELLOW ELEC PUMP P/BSW.
(2) Make sure that the ECAM lower DU shows:
5. Close-up(1) On the panel 40VU push the YELLOW ELEC PUMP P/BSW.
(2) Make sure that the ECAM lower DU shows:
- the correct operation of the PTU,
- that the pressure of the Yellow hydraulic system is 3000 psi approximately,
- the pressure of the Green hydraulic system is 3000 psi approximately.
NOTE: The PTU pressurizes the system to a nominal pressure of 3000 psi, but if no consumers are operated the pressure is not constant. The PTU operates in a cycle which keeps the pressure in the Green hydraulic system between 2100 and 3150 psi.
Subtask 29-23-00-865-074-A
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | PTU INHIT/Y SYS | 1808GL | Q33 |
| 121VU | PTU INHIT/G SYS | 1807GL | Q32 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC / PTU FLT INHIB | 1825GL | Q31 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | HYDRAULIC-PTU FLT INHIT | 1825GL | Q32 |