W DOC AIRBUS | TSM A320F

Loss of the Correct Quantity in the Green Hydraulic Reservoir

TASK 29-11-00-810-803-A
Loss of the Correct Quantity in the Green Hydraulic Reservoir

1. Possible Causes
  • LOW LEVEL SWITCH
  • C/B-HYDRAULIC/LOW/LVL/IND [1832GQ]
  • wiring
  • Hydraulic components and lines
  • QUANTITY INDICATOR - TRANSMITTER
  • C/B-HYDRAULIC/HYD/QTY/IND [1831GQ]
  • SDAC-1 [1WV1]
  • SDAC-2 [1WV2]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 31-54-00-810-833-A
Loss of the GREEN RSVR QTY Input of the SDAC 1
TSM TASK 31-54-00-810-834-A
Loss of the GREEN RSVR QTY Input of the SDAC 2
AMM 12-32-28-281-001
Drain Water Content
AMM 24-41-00-861-002
Energize the Aircraft Electrical Circuits from the External Power
AMM 29-00-00-280-001
Check of the Internal Leakage of the Green Hydraulic System
AMM 29-00-00-280-006
Check of the Green or Yellow Hydraulic System after Engine Pump Failure or Operation in a Possible Cavitation Condition - with Ground Cart Available
AMM 29-00-00-790-001
Check of the External Leaks of the Hydraulic Components
ASM 291101
AMM 29-11-41-000-002
Removal of the Quantity Indicator of the Green Hydraulic Reservoir
AMM 29-11-41-000-003
Removal of the Low Level Switch of the Green Hydraulic Reservoir
AMM 29-11-41-400-002
Installation of the Quantity Indicator of the Green Hydraulic Reservoir
AMM 29-11-41-400-003
Installation of the Low Level Switch of the Green Hydraulic Reservoir
AMM 29-31-00-710-001
Functional Check of Reservoir Low Level Warning
ASM 293101
ASM 293102
AMM 31-55-34-000-001
Removal of the SDAC
AMM 31-55-34-400-001
Installation of the SDAC
AMM 31-60-00-860-001
EIS Start Procedure
3. Fault Confirmation
Subtask 29-11-00-865-050-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUHYDRAULIC/LOW/LVL/IND1832GQN32
121VUHYDRAULIC/HYD/QTY/IND1831GQP35
121VUHYDRAULIC/G HYD/PUMP ENG1/MONG1702GKR34
Subtask 29-11-00-860-050-A
B. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
   (2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
   (3) On the ECAM control panel on the center pedestal, push the HYD pushbutton switch. Make sure that the HYD page is shown on the system display of the ECAM.
   (4) Look for fault indications on the upper ECAM DU, the lower ECAM DU and panel 40VU.
4. Fault Isolation
Subtask 29-11-00-810-064-A
A. If the Fault Confirmation gives:
  • The message HYD G RSVR LO LVL on the upper ECAM DU
  • The contents indication (shows low-fluid level) on the lower ECAM DU in amber
  • The PTU P/BSW FAULT on panel 40VU
  • The GREEN ENG 1 PUMP P/BSW FAULT on panel 40VU:
   (1) Do a visual check of the quantity shown on the mechanical indicator of the Green reservoir.
   (2) If the quantity shown is more than or equal to 3.5 l (0.9246 USgal):
     (a) Do a check for 28VDC between:
  • The LOW LEVEL SWITCH connector B/A and connector B/C ASM 293102.
     (b) If there is no 28VDC:
       1 Do a check of the wiring between:
  • The LOW LEVEL SWITCH connector B/C and C/B-HYDRAULIC/LOW/LVL/IND [1832GQ] and repair the wiring as necessary ASM 293102.
     (c) If there is 28VDC:
     (d) If the fault continues:
       1 Make sure that the wiring is not connected to GND between:
       2 If the wiring is connected to GND:
  • Repair the wiring as necessary.
   (3) If the quantity shown is less than 3.5 l (0.9246 USgal):
     (a) Do a check of the engine pump for a possible cavitation condition AMM 29-00-00-280-006.
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 pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
     (b) Make sure that the drain valve of the hydraulic reservoir has no leaks.
       1 If the drain valve has a leak:
  • Replace the drain valve.
       2 If the drain valve has no leaks:
       3 If the fault continues:
       4 If the internal leakage rate is too high:
  • Repair the defective component.
       5 If the fault continues, or you cannot find a defective component:
         a Remove a fuel sample from each water drain-valve AMM 12-32-28-281-001
         b Do a check for contamination of the fuel with hydraulic fluid after each removal of a fuel sample.
       6 If you find hydraulic fluid contamination in one or more fuel samples:
  • Do a check of the hydraulic lines and components in the applicable tank area for leaks and repair them.
Subtask 29-11-00-810-065-A
B. If the Fault Confirmation gives:
  • The message HYD G RSVR LO LVL on the upper ECAM DU
  • The contents indication (shows low fluid level) on the lower ECAM DU in amber:
   (1) Do a visual check of the quantity shown on the mechanical indicator of the Green reservoir.
   (2) If the quantity shown is more than or equal to 2.6 l (0.6868 USgal):
     (a) Do a check of the engine pump for a possible cavitation condition AMM 29-00-00-280-006.
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 pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
     (b) Do a check for 26VAC between:
  • The QUANTITY INDICATOR - TRANSMITTER connector A/D and the connector A/E ASM 293101.
     (c) If there is no 26VAC:
       1 Do a check of the wiring between:
  • The QUANTITY INDICATOR - TRANSMITTER connector A/D and the C/B-HYDRAULIC/HYD/QTY/IND [1831GQ] and repair the wiring as necessary ASM 293101.
     (d) If the fault continues:
       1 Do a check for a ground signal between:
  • The QUANTITY INDICATOR - TRANSMITTER connector A/E and ground and repair the wiring as necessary ASM 293101.
       2 If there is 26VAC:
     (e) If the fault continues:
       1 Do the troubleshooting procedure for the loss of the GREEN RSVR QTY input of the SDAC-1 [1WV1] (Ref. TSM TASK 31-54-00-810-833).
     (f) If the fault continues:
       1 Do the troubleshooting procedure for the loss of the GREEN RSVR QTY input of the SDAC-2 [1WV2] (Ref. TSM TASK 31-54-00-810-834).
     (g) Do a check for 28VDC between:
  • The GREEN HYDRAULIC RESEVOIR LOW LEVEL SWITCH connector B/A and connector B/C ASM 293101.
       1 If there is no 28VDC:
  • Do a check and repair the wiring between the LOW LEVEL SWITCH connector B/C and the C/B-HYDRAULIC/LOW/LVL/IND [1832GQ] .
       2 If there is 28VDC:
   (3) If the quantity shown is less than 2.6 l (0.6868 USgal):
     (a) Do a check of the engine pump for a possible cavitation condition AMM 29-00-00-280-006.
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 pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
     (b) Do a check for 28VDC between:
  • The LOW LEVEL SWITCH connector B/A and the connector B/C ASM 293102.
     (c) If there is no 28VDC:
       1 do a check of the wiring between:
  • The LOW LEVEL SWITCH connector B/C and the C/B-HYDRAULIC/LOW/LVL/IND [1832GQ] and repair the wiring as necessary ASM 293102.
     (d) If there is 28VDC:
   (4) Make sure that the drain valve of the hydraulic reservoir has no leaks.
     (a) If the drain valve has a leak:
  • Replace the drain valve.
     (b) If the drain valve has no leaks:
     (c) If the fault continues:
       1 Do a check of the internal leakage of the Green hydraulic system AMM 29-00-00-280-001.
       2 If the internal leakage rate is too high:
  • Repair the defective component.
       3 If the fault continues, or you cannot find a defective component:
         a Remove a fuel sample from each water drain-valve AMM 12-32-28-281-001.
         b Do a check for contamination of the fuel with hydraulic fluid after each removal of a fuel sample.
       4 If you find hydraulic fluid contamination in one or more fuel samples:
  • Do a check of the hydraulic lines and components in the applicable tank area for leaks and repair them.
Subtask 29-11-00-810-054-A
C. If the Fault Confirmation gives:
  • The message HYD G RSVR LO LVL on the upper ECAM DU
  • The PTU P/BSW FAULT on panel 40VU
  • The GREEN ENG 1 PUMP P/BSW FAULT on panel 40VU:
   (1) Do a visual check of the quantity shown on the mechanical indicator of the Green reservoir.
   (2) If the quantity shown is less than 2.6 l (0.6868 USgal):
     (a) Do a check of the engine pump for a possible cavitation condition AMM 29-00-00-280-006.
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 pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
     (b) Replace the QUANTITY INDICATOR - TRANSMITTER AMM 29-11-41-000-002 and AMM 29-11-41-400-002.
     (c) If the fault continues:
     (d) If the fault continues:
   (3) Make sure that the drain valve of the hydraulic reservoir has no leaks.
     (a) If the drain valve has a leak:
  • Replace the drain valve.
     (b) If the drain valve has no leaks:
     (c) If the fault continues:
       1 If the internal leakage rate is too high:
  • Repair the defective component.
       2 If the fault continues, or you cannot find a defective component:
         a Remove a fuel sample from each water drain-valve AMM 12-32-28-281-001.
         b Do a check for contamination of the fuel with hydraulic fluid after each removal of a fuel sample.
       3 If you find hydraulic fluid contamination in one or more fuel samples:
  • Do a check of the hydraulic lines and components in the applicable tank area for leaks and repair them.
   (4) If the quantity shown is more than or equal to 2.6 l (0.6868 USgal):
     (a) Do a check for 28VDC between:
  • The GREEN HYDRAULIC RESEVOIR LOW LEVEL SWITCH connector B/A and the connector B/C ASM 293101.
       1 If there is no 28VDC:
  • Do a check and repair the wiring between the LOW LEVEL SWITCH connector B/C and the C/B-HYDRAULIC/LOW/LVL/IND [1832GQ] .
       2 If there is 28VDC:
     (b) If the fault continues:
     (c) If the fault continues:
     (d) If the fault continues:
       1 Make sure that the wiring is not connected to GND between:
       2 If the wiring is connected to GND:
  • Repair the wiring as necessary.
Subtask 29-11-00-710-054-A
D. Do the operational test of the fluid low level warning AMM 29-31-00-710-001 to make sure that the operation is correct (no message shown).
[Rev.8 from Aug 2018] 2026.04.04 04:39:54 UTC
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