W DOC AIRBUS | AMM A320F

Functional Check of Parking/Emergency Brake Accumulator by Reading the Charge Pressure on the Accumulator Gauge

TASK 32-44-11-200-001-A
Functional Check of Parking/Emergency Brake Accumulator by Reading the Charge Pressure on the Accumulator Gauge

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 148
ZONE: 210
ZONE: 744
FIN: 2582GM
1. Reason for the Job
Refer to the MPD TASK: 324411-01
FUNCTIONAL CHECK OF PARKING/EMERGENCY BRAKE ACCUMULATOR BY READING THE CHARGE PRESSURE ON THE ACCUMULATOR GAUGE
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
1
THERMOMETER -45 TO 70 DEG.C (-49 TO 158 DEG.F)
No specific
AR
WARNING NOTICE(S)
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.14CCB6)
Testing Medium-Leak Detection - Oxygen System
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
148
MAIN GEAR WELL AND HYDRAULIC COMPARTMENT
210
CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
744
MAIN DOOR
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 12-14-32-614-002-A
Nitrogen Filling of the Yellow Hydraulic System, Brake Pressure Accumulator
TASK 24-42-00-861-001-A
Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A
De-energize the Ground Service Network Supplied from the External Power
TASK 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-00-00-870-007-A
Bleeding Procedure of the Yellow Hydraulic System Downstream of the Engine Pump
TASK 29-10-00-864-004-A
Depressurize the Brake System
TASK 29-24-00-863-001-A
Pressurize the Yellow Hydraulic System with the Electric Pump
TASK 32-12-00-010-001-A
Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A
Close the Main Gear Doors after Access
TASK 32-43-00-710-001-A
Operational Check of Alternate Braking System
TASK 32-44-11-000-001-A
Removal of the Accumulator
TASK 32-44-11-400-001-A
Installation of the Accumulator
TASK 32-44-13-000-001-A
Removal of the Charging Valve
TASK 32-44-13-400-001-A
Installation of the Charging Valve
TASK 32-44-14-000-001-A
Removal of the Accumulator Pressure Gage
TASK 32-44-14-400-001-A
Installation of the Accumulator Pressure Gage
F Accumulator Nitrogen Fill-Pressure ** ON A/C NOT FOR ALL
F Accumulator Nitrogen Fill-Pressure ** ON A/C NOT FOR ALL
F Accumulator Nitrogen Fill-Pressure ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 32-44-11-860-054-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the wheel chocks are in position.
   (2) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
   (3) On the parking brake panel 110VU, make sure that the PARKING BRK control-switch (73GG) is in the OFF position.
   (4) Make sure that the Yellow hydraulic system is depressurized.
(Ref. AMM TASK 29-00-00-864-001).
Subtask 32-44-11-865-055-A
B. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUHYDRAULIC/BRAKING AND STEERING/SYS2/SPLY4GGM36
121VUHYDRAULIC/BRAKING AND STEERING/SYS2/CTL3GGM35
121VUHYDRAULIC/BRAKING AND STEERING/SYS1/CTL1GGM34
121VUHYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY2GGM33
Subtask 32-44-11-941-050-A
C. Safety Precaution
   (1) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the yellow hydraulic
  • on the panel 40 VU in the cockpit
  • on the Ground Service Panel of the yellow hydraulic system, access door 198CB
Subtask 32-44-11-010-052-A
D. Get Access
   (1) Open the main door of the right main landing gear (Ref. AMM TASK 32-12-00-010-001).
   (2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position in zone 148.
4. Procedure
Subtask 32-44-11-210-050-A ** ON A/C NOT FOR ALL
A. Check of the Nitrogen Fill Pressure
F Accumulator Nitrogen Fill-Pressure ** ON A/C NOT FOR ALL
   (1) Depressurize the brake system (Ref. AMM TASK 29-10-00-864-004).
   (2) Wait for a minimum of ten minutes before you read the brake accumulator pressure-gage (2585GM).
NOTE: This gives time for the temperature of the gas to become stable. The pressure can increase during this time.
NOTE: If you do this check immediately after the aircraft landing, let the pressure become stable for 30 minutes to get a more accurate value (temperature compensation of the brake accumulator (2582GM)).
   (3) Do a check of the charge pressure of the brake accumulator (2582GM) as follows:
     (a) Use a THERMOMETER -45 TO 70 DEG.C (-49 TO 158 DEG.F) to measure and record the temperature of the brake accumulator (2582GM).
       1 When you measure the temperature, make sure that the THERMOMETER -45 TO 70 DEG.C (-49 TO 158 DEG.F) touches the gas interface/neck of the brake accumulator (2582GM).
   (4) Read the nitrogen pressure value of the brake accumulator (2582GM) on the brake accumulator pressure-gage (2585GM). Compare the nitrogen pressure value on the brake accumulator pressure-gage (2585GM) with the graph of the accumulator nitrogen fill-pressure.
     (a) If the value on the brake accumulator pressure-gage (2585GM) is correct (value "P" plus or minus 50 psi (3.45 bar)):
  • No other maintenance is necessary, go to Para. 4.B.
     (b) If the value on the brake accumulator pressure-gage (2585GM) is more than "P" plus 50 psi (3.45 bar):
     (c) If the value on the brake accumulator pressure-gage (2585GM) is between "P" minus 50 psi (3.45 bar) and "P" minus 218 psi (15 bar):
     (d) If the value on the brake accumulator pressure-gage (2585GM) is less than "P" minus 218 psi (15 bar):
       1 Adjust the nitrogen pressure as necessary (Ref. AMM TASK 12-14-32-614-002).
       2 Pressurize and depressurize the brake accumulator (2582GM) as follows:
         a Pressurize the Yellow hydraulic system with the electric pump (Ref. AMM TASK 29-24-00-863-001).
         b In the cockpit, do a check of the brake accumulator pressure on the triple pressure-indicator (60GG).
  • Let the pressure increase to between 2800 psi (193 bar) and 3200 psi (221 bar) and become stable.
         c When the accumulator pressure is stable, stop the electric pump.
         d On the brake manifold (3016GM), operate the manual depressurization button on the brake relief-valve (3067GM) to depressurize the brake accumulator (2582GM) (Ref. AMM TASK 29-10-00-864-004).
       3 After 10 minutes, do the check of the value again on the brake accumulator pressure-gage (2585GM).
         a If the accumulator pressure value is correct, "P" plus or minus 102 psi (7 bar):
  • No other maintenance is necessary, go to Para. 4.B.
         b If the accumulator pressure value is more than "P" plus 102 psi (7 bar):
  • Decrease the accumulator pressure to the correct value "P".
         c If the accumulator pressure value is less than "P" minus 102 psi (7 bar):
  • Do the next step.
       4 Do a leak check with Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) on:
  • The charging valve (2586GM)
  • The brake accumulator pressure-gage (2585GM)
  • The adapter at the top end of the brake accumulator (2582GM).
         a If you find leaks, do a check of the specified torque value on the applicable nut or connection. Then, adjust the nitrogen pressure as necessary (Ref. AMM TASK 12-14-32-614-002).
         b If you cannot stop the nitrogen leaks, replace the defective component(s) as necessary:
         c If there are no external nitrogen leaks:
       5 If you replaced the brake accumulator (2582GM):
  • Bleed the Yellow hydraulic system downstream of the engine pump to remove the nitrogen that can be in the hydraulic system (because of the brake accumulator (2582GM)) (Ref. AMM TASK 29-00-00-870-007).
Subtask 32-44-11-210-050-B ** ON A/C NOT FOR ALL
A. Check of the Nitrogen Fill Pressure
F Accumulator Nitrogen Fill-Pressure ** ON A/C NOT FOR ALL
   (1) Depressurize the brake system (Ref. AMM TASK 29-10-00-864-004).
   (2) Wait for a minimum of ten minutes before you read the brake accumulator pressure-gage (2585GM).
NOTE: This gives time for the temperature of the gas to become stable. The pressure can increase during this time.
NOTE: If you do this check immediately after the aircraft landing, let the pressure become stable for 30 minutes to get a more accurate value (temperature compensation of the brake accumulator (2582GM)).
   (3) Do a check of the charge pressure of the brake accumulator (2582GM) as follows:
     (a) Use a THERMOMETER -45 TO 70 DEG.C (-49 TO 158 DEG.F) to measure and record the temperature of the brake accumulator (2582GM).
       1 When you measure the temperature, make sure that the THERMOMETER -45 TO 70 DEG.C (-49 TO 158 DEG.F) touches the gas interface/neck of the brake accumulator (2582GM).
   (4) Read the nitrogen pressure value of the brake accumulator (2582GM) on the brake accumulator pressure-gage (2585GM). Compare the nitrogen pressure value on the brake accumulator pressure-gage (2585GM) with the graph of the accumulator nitrogen fill-pressure.
     (a) If the value on the brake accumulator pressure-gage (2585GM) is correct ("P" plus or minus 50 psi (3.45 bar)):
  • No other maintenance is necessary, go to Para. 4.B.
     (b) If the value on the brake accumulator pressure-gage (2585GM) is more than "P" plus 50 psi (3.45 bar):
     (c) If the value on the brake accumulator pressure-gage (2585GM) is between "P" minus 50 psi (3.45 bar) and "P" minus 218 psi (15 bar):
     (d) If the value on the brake accumulator pressure-gage (2585GM) is less than "P" minus 218 psi (15 bar):
       1 Adjust the nitrogen pressure as necessary (Ref. AMM TASK 12-14-32-614-002).
       2 Pressurize and depressurize the brake accumulator (2582GM) as follows:
         a Pressurize the Yellow hydraulic system with the electric pump (Ref. AMM TASK 29-24-00-863-001).
         b In the cockpit, do a check of the brake accumulator pressure on the triple pressure-indicator (60GG).
  • Let the pressure increase to between 2800 psi (193 bar) and 3200 psi (221 bar) and become stable.
         c When the accumulator pressure is stable, stop the electric pump.
         d On the brake manifold (3016GM), operate the manual depressurization button on the brake relief-valve (3067GM) to depressurize the brake accumulator (2582GM) (Ref. AMM TASK 29-10-00-864-004).
       3 After 10 minutes, do the check of the value again on the brake accumulator pressure-gage (2585GM).
         a If the accumulator pressure value is correct, "P" plus or minus 102 psi (7 bar):
  • No other maintenance is necessary, go to Para. 4.B.
         b If the accumulator pressure value is more than "P" plus 102 psi (7 bar):
  • Decrease the accumulator pressure to the correct value "P".
         c If the accumulator pressure value is less than "P" minus 102 psi (7 bar):
  • Do the next step.
       4 Do a leak check with Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) on:
  • The charging valve (2586GM)
  • The brake accumulator pressure-gage (2585GM)
  • The adapter at the top end of the brake accumulator (2582GM).
         a If you find leaks, do a check of the specified torque value on the applicable nut or connection. Then, adjust the nitrogen pressure as necessary (Ref. AMM TASK 12-14-32-614-002).
         b If you cannot stop the nitrogen leaks, replace the defective component(s) as necessary:
         c If there are no external nitrogen leaks:
       5 If you replaced the brake accumulator (2582GM):
  • Bleed the Yellow hydraulic system downstream of the engine pump to remove the nitrogen that can be in the hydraulic system (because of the brake accumulator (2582GM)) (Ref. AMM TASK 29-00-00-870-007).
Subtask 32-44-11-210-050-C ** ON A/C NOT FOR ALL
A. Check of the Nitrogen Fill Pressure
F Accumulator Nitrogen Fill-Pressure ** ON A/C NOT FOR ALL
   (1) Depressurize the brake system (Ref. AMM TASK 29-10-00-864-004).
   (2) Wait for a minimum of ten minutes before you read the brake accumulator pressure-gage (2585GM).
NOTE: This gives time for the temperature of the gas to become stable. The pressure can increase during this time.
NOTE: If you do this check immediately after the aircraft landing, let the pressure become stable for 30 minutes to get a more accurate value (temperature compensation of the brake accumulator (2582GM)).
   (3) Do a check of the charge pressure of the brake accumulator (2582GM) as follows:
     (a) Use a THERMOMETER -45 TO 70 DEG.C (-49 TO 158 DEG.F) to measure and record the temperature of the brake accumulator (2582GM).
       1 When you measure the temperature, make sure that the THERMOMETER -45 TO 70 DEG.C (-49 TO 158 DEG.F) touches the gas interface/neck of the brake accumulator (2582GM).
   (4) Read the nitrogen pressure value of the brake accumulator (2582GM) on the brake accumulator pressure-gage (2585GM). Compare the nitrogen pressure value on the brake accumulator pressure-gage (2585GM) with the graph of the accumulator nitrogen fill-pressure.
     (a) If the value on the brake accumulator pressure-gage (2585GM) is correct ("P" plus or minus 50 psi (3.45 bar)):
  • No other maintenance is necessary, go to Para. 4.B.
     (b) If the value on the brake accumulator pressure-gage (2585GM) is more than "P" plus 50 psi (3.45 bar):
     (c) If the value on the brake accumulator pressure-gage (2585GM) is between "P" minus 50 psi (3.45 bar) and "P" minus 290 psi (20 bar):
     (d) If the value on the brake accumulator pressure-gage (2585GM) is less than "P" minus 290 psi (20 bar):
       1 Adjust the nitrogen pressure as necessary (Ref. AMM TASK 12-14-32-614-002).
       2 Pressurize and depressurize the brake accumulator (2582GM) as follows:
         a Pressurize the Yellow hydraulic system with the electric pump (Ref. AMM TASK 29-24-00-863-001).
         b In the cockpit, do a check of the brake accumulator pressure on the triple pressure-indicator (60GG).
  • Let the pressure increase to between 2800 psi (193 bar) and 3200 psi (221 bar) and become stable.
         c When the accumulator pressure is stable, stop the electric pump.
         d On the brake manifold (3016GM), operate the manual depressurization button on the brake relief-valve (3067GM) to depressurize the brake accumulator (2582GM) (Ref. AMM TASK 29-10-00-864-004).
       3 After 10 minutes, do the check of the value again on the brake accumulator pressure-gage (2585GM).
         a If the accumulator pressure value is correct, "P" plus or minus 102 psi (7 bar):
  • No other maintenance is necessary, go to Para. 4.B.
         b If the accumulator pressure value is more than "P" plus 102 psi (7 bar):
  • Decrease the accumulator pressure to the correct value "P".
         c If the accumulator pressure value is less than "P" minus 102 psi (7 bar):
  • Do the next step.
       4 Do a leak check with Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) on:
  • The charging valve (2586GM)
  • The brake accumulator pressure-gage (2585GM)
  • The adapter at the top end of the brake accumulator (2582GM).
         a If you find leaks, do a check of the specified torque value on the applicable nut or connection. Then, adjust the nitrogen pressure as necessary (Ref. AMM TASK 12-14-32-614-002).
         b If you cannot stop the nitrogen leaks, replace the defective component(s) as necessary:
         c If there are no external nitrogen leaks:
       5 If you replaced the brake accumulator (2582GM):
  • Bleed the Yellow hydraulic system downstream of the engine pump to remove the nitrogen that can be in the hydraulic system (because of the brake accumulator (2582GM)) (Ref. AMM TASK 29-00-00-870-007).
Subtask 32-44-11-865-060-A
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUHYDRAULIC/BRAKING AND STEERING/SYS2/SPLY4GGM36
121VUHYDRAULIC/BRAKING AND STEERING/SYS2/CTL3GGM35
121VUHYDRAULIC/BRAKING AND STEERING/SYS1/CTL1GGM34
121VUHYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY2GGM33
Subtask 32-44-11-710-051-A
C. Test(s)
   (1) Do the operational check of the alternate braking system (Ref. AMM TASK 32-43-00-710-001).
5. Close-up
Subtask 32-44-11-942-053-A
A. Removal of Equipment
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the warning notice(s).
   (3) Remove the access platform.
Subtask 32-44-11-410-050-A
B. Close Access
   (1) Close the main door of the right main landing gear (Ref. AMM TASK 32-12-00-410-001)
Subtask 32-44-11-862-050-A
C. Aircraft Maintenance Configuration
   (1) Put the aircraft back to its initial configuration.
   (2) De-energize the Ground Service Network (Ref. AMM TASK 24-42-00-862-001).
[Rev.10 from 2021] 2026.04.01 00:49:31 UTC
"Aviabrain" 2025