W DOC AIRBUS | TSM A320F

Unwanted PTU Inhibition on Ground

TASK 29-23-00-810-814-A
Unwanted PTU Inhibition on Ground

1. Possible Causes
  • RELAY-ENG/MASTER 1 [11QG]
  • RELAY-ENG/MASTER 2 [12QG]
  • RELAY-LDG CTL [1805GL]
  • RELAY-N/W STRG DE-ACT [1806GL]
  • RELAY-PARK BRAKE CTL [1804GL]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 29-23-00-810-801-A
Fault of the Power Transfer Unit (PTU)
AMM 12-12-29-611-001
Fill the Hydraulic Fluid Reservoir with a Hand Pump
AMM 12-12-29-611-002
Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
AMM 24-41-00-861-002
Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002
De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 29-14-00-614-002
Pressurization of the Hydraulic Reservoirs through the Ground Connector
AMM 29-23-00-710-002
Functional Check of the Power Transfer Unit (PTU) Green to Yellow
AMM 29-23-00-710-003
Functional Check of the Power Transfer Unit (PTU) Yellow to Green
AMM 29-23-00-860-002
Connection of the Isolation Coupling of the Power Transfer Unit (PTU)
ASM 292301
AMM 31-60-00-860-001
EIS Start Procedure
AMM 31-60-00-860-002
EIS Stop Procedure
AMM 71-00-00-710-001
Dry Motoring Check
AMM 71-00-00-860-817
Motor the Engine (Dry Method)
3. Fault Confirmation
Subtask 29-23-00-710-073-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
   (2) Make sure that the cargo compartment doors are not in operation with the Yellow electric hydraulic pump.
   (3) Make sure that the isolation coupling of the PTU is connected AMM 29-23-00-860-002.
   (4) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
   (5) On the ECAM control panel on the center pedestal, press the HYD pushbutton. Make sure that the HYD page is shown on the ECAM lower Display Unit (DU).
   (6) Make sure that the ECAM does not show any of these conditions:
  • Low air pressure in the Green and Yellow reservoirs
  • Low fluid level in the Green adn Yellow reservoirs.
   (7) If necessary, pressurize the reservoir AMM 29-14-00-614-002.
   (8) If necessary, add fluid to the reservoir AMM 12-12-29-611-001 or AMM 12-12-29-611-002.
   (9) On the overhead panel 40VU, make sure that the YELLOW ELEC PUMP P/BSW is set to OFF (ON and FAULT lights are off).
   (10) Make sure that the PTU P/BSW is in the AUTO position (OFF light not on).
   (11) Make sure that:
  • The wheel chocks are in position at the main landing gears
  • The SW PARK BRK CTL (73GG) is set to off
  • The Nose L/G is activated
  • A towing arm is not installed.
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
CAUTION: DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.
   (12) Do the check for unwanted inhibition of the PTU:
ACTION
RESULT
1. On overhead panel 40VU:
  • Push and release the PTU P/BSW.
On overhead panel 40VU:
  • The OFF light of the PTU P/BSW comes on.
2. Dry-motor the ENG1 AMM 71-00-00-710-001.
On the ECAM lower DU:
  • During the start-up of the ENG1, the pressure in the Green hydraulic system is between 2900 and 3100 psi
  • The pressure in the Yellow hydraulic system is 0 psi.

    The PTU does not operate.
3. On overhead panel 40VU:
  • Push and release the PTU P/BSW.
On overhead panel 40VU:
  • The OFF light of the PTU P/BSW goes off
  • The PTU P/BSW is set to AUTO.

    On the ECAM lower DU:
  • The PTU starts to pressurize from the Green to the Yellow hydraulic system
  • The pressure in the Yellow hydraulic system is between 2200 and 3150 psi.
4. On overhead panel 40VU:
  • Push and release the PTU P/BSW.
On overhead panel 40VU:
  • The OFF light of the PTU P/BSW comes on.
5. Stop the dry-motoring of the ENG1 AMM 71-00-00-710-001.
On the ECAM lower DU:
  • The pressure in the Green and Yellow hydraulic systems decreases to 0 psi.
6. Dry-motor the ENG2 AMM 71-00-00-710-001.
On the ECAM lower DU:
  • During the start-up of the ENG2, the pressure in the Yellow hydraulic system is between 2900 and 3100 psi
  • The pressure in the Green hydraulic system is 0 psi.

    The PTU does not operate.
7. On overhead panel 40VU:
  • Push and release the PTU P/BSW.
On overhead panel 40VU:
  • The OFF light of the PTU P/BSW goes off
  • The PTU P/BSW is set to AUTO.

    On the ECAM lower DU:
  • The PTU starts to pressurize from the Yellow to the Green hydraulic system
  • The pressure in the Green hydraulic system is between 2200 and 3150 psi.
8. On overhead panel 40VU:
  • Push and release the PTU P/BSW.
On overhead panel 40VU:
  • The OFF light of the PTU P/BSW comes on.
9. Stop the dry-motoring of the ENG2 AMM 71-00-00-710-001.
On the ECAM lower DU:
  • The pressure in the Green and Yellow hydraulic systems decreases to 0 psi.
   (13) Do the EIS stop procedure
AMM 31-60-00-860-002.
   (14) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
Subtask 29-23-00-710-073-C ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
   (2) Make sure that the cargo compartment doors are not in operation with the Yellow electric hydraulic pump.
   (3) Make sure that the isolation coupling of the PTU is connected AMM 29-23-00-860-002.
   (4) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
   (5) On the ECAM control panel on the center pedestal, press the HYD pushbutton. Make sure that the HYD page is shown on the ECAM lower Display Unit (DU).
   (6) Make sure that the ECAM does not show any of these conditions:
  • Low air pressure in the Green and Yellow reservoirs
  • Low fluid level in the Green adn Yellow reservoirs.
   (7) If necessary, pressurize the reservoir AMM 29-14-00-614-002.
   (8) If necessary, add fluid to the reservoir AMM 12-12-29-611-001 or AMM 12-12-29-611-002.
   (9) On the overhead panel 40VU, make sure that the YELLOW ELEC PUMP P/BSW is set to OFF (ON and FAULT lights are off).
   (10) Make sure that the PTU P/BSW is in the AUTO position (OFF light not on).
   (11) Make sure that:
  • The wheel chocks are in position at the main landing gears
  • The SW PARK BRK CTL (73GG) is set to off
  • The Nose L/G is activated
  • A towing arm is not installed.
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
CAUTION: DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.
   (12) Do the check for unwanted inhibition of the PTU:
ACTION
RESULT
1. On overhead panel 40VU:
  • Push and release the PTU P/BSW.
On overhead panel 40VU:
  • The OFF light of the PTU P/BSW comes on.
2. Dry-motor the ENG1 AMM 71-00-00-860-817.
On the ECAM lower DU:
  • During the start-up of the ENG1, the pressure in the Green hydraulic system is between 2900 and 3100 psi
  • The pressure in the Yellow hydraulic system is 0 psi.

    The PTU does not operate.
3. On overhead panel 40VU:
  • Push and release the PTU P/BSW.
On overhead panel 40VU:
  • The OFF light of the PTU P/BSW goes off
  • The PTU P/BSW is set to AUTO.

    On the ECAM lower DU:
  • The PTU starts to pressurize from the Green to the Yellow hydraulic system
  • The pressure in the Yellow hydraulic system is between 2200 and 3150 psi.
4. On overhead panel 40VU:
  • Push and release the PTU P/BSW.
On overhead panel 40VU:
  • The OFF light of the PTU P/BSW comes on.
5. Stop the dry-motoring of the ENG1 AMM 71-00-00-860-817.
On the ECAM lower DU:
  • The pressure in the Green and Yellow hydraulic systems decreases to 0 psi.
6. Dry-motor the ENG2 AMM 71-00-00-860-817.
On the ECAM lower DU:
  • During the start-up of the ENG2, the pressure in the Yellow hydraulic system is between 2900 and 3100 psi
  • The pressure in the Green hydraulic system is 0 psi.

    The PTU does not operate.
7. On overhead panel 40VU:
  • Push and release the PTU P/BSW.
On overhead panel 40VU:
  • The OFF light of the PTU P/BSW goes off
  • The PTU P/BSW is set to AUTO.

    On the ECAM lower DU:
  • The PTU starts to pressurize from the Yellow to the Green hydraulic system
  • The pressure in the Green hydraulic system is between 2200 and 3150 psi.
8. On overhead panel 40VU:
  • Push and release the PTU P/BSW.
On overhead panel 40VU:
  • The OFF light of the PTU P/BSW comes on.
9. Stop the dry-motoring of the ENG2 AMM 71-00-00-860-817.
On the ECAM lower DU:
  • The pressure in the Green and Yellow hydraulic systems decreases to 0 psi.
   (13) Do the EIS stop procedure
AMM 31-60-00-860-002.
   (14) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
4. Fault Isolation
Subtask 29-23-00-810-066-A
A. If the PTU does not start, do the subsequent troubleshooting procedure:
   (1) Do the operational tests of the PTU AMM 29-23-00-710-002 and AMM 29-23-00-710-003.
     (a) If the operation of the PTU is not correct, do the troubleshooting of the PTU (Ref. TSM TASK 29-23-00-810-801).
     (b) If the operation of the PTU is correct, find the applicable troubleshooting procedure in the subsequent steps.
   (2) If the fault continues:
     (a) Do a check of the RELAY-ENG/MASTER 1 [11QG] .
  • If necessary, replace the RELAY-ENG/MASTER 1 [11QG] , refer to the ASM 292301.
     (b) If the fault continues:
  • Do a check of the RELAY-ENG/MASTER 2 [12QG]
  • If necessary, replace the RELAY-ENG/MASTER 2 [12QG] , refer to the ASM 292301.
     (c) If the fault continues:
  • Do a check of the RELAY-LDG CTL [1805GL]
  • If necessary, replace the RELAY-LDG CTL [1805GL] , refer to the ASM 292301.
     (d) If the fault continues:
  • Do a check of the RELAY-N/W STRG DE-ACT [1806GL] .
  • If necessary, replace the RELAY-N/W STRG DE-ACT [1806GL] , refer to the ASM 292301.
     (e) If the fault continues:
  • Do a check of the RELAY-PARK BRAKE CTL [1804GL] .
  • If necessary, replace the RELAY-PARK BRAKE CTL [1804GL] , refer to the ASM 292301.
Subtask 29-23-00-710-074-A
B. Do the fault confirmation procedure as given in Para. 3 to make sure that the operation is correct.
[Rev.8 from Aug 2018] 2026.04.04 04:29:29 UTC
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