W DOC AIRBUS | AMM A320F

Fill the Hydraulic Power Accumulators with Nitrogen

TASK 12-14-29-614-001-A
Fill the Hydraulic Power Accumulators with Nitrogen

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: 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: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
FIN: 1070GM
FIN: 2070GM
FIN: 3070GM
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 2M (6 FT) - ADJUSTABLE
No specific
1
WARNING NOTICE(S)
No specific
Torque wrench: range to between 10.0 and 5.0 lbf.in (0.11 and 0.06 m.daN ) T
No specific
Torque wrench: range to between 60 and 50 lbf.in (0.68 and 0.57 m.daN ) T
98F29103500000
1
FILL UNIT-NITROGEN
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.14VGC1)
Individual Compound-- Nitrogen Gaseous
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
FOR [2070GM] (HYD ACCU BLUE)
195BB
FOR [3070GM] (HYD ACCU YELLOW)
196BB
 D. Referenced Information
REFERENCE
DESIGNATION
F Hydraulic Power Accumulators - Location
FOR [1070GM] (HYD ACCU GREEN)
TASK 29-10-00-864-001-A
Depressurize the Green Hydraulic System
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
FOR [2070GM] (HYD ACCU BLUE)
TASK 29-10-00-864-003-A
Depressurize the Blue Hydraulic System
FOR [3070GM] (HYD ACCU YELLOW)
TASK 29-10-00-864-002-A
Depressurize the Yellow Hydraulic System
3. Job Set-up
Subtask 12-14-29-010-052-A
A. Get Access
   (1) Open the applicable access door/panel:
     (a) FOR [1070GM] (HYD ACCU GREEN)
Open the left main-landing-gear (MLG) door (Ref. AMM TASK 32-12-00-010-001).
     (b) FOR [3070GM] (HYD ACCU YELLOW)
Open access panel 196BB.
     (c) FOR [2070GM] (HYD ACCU BLUE)
Open access panel 195BB.
Subtask 12-14-29-860-050-A
B. Aircraft Maintenance Configuration
   (1) Depressurize the applicable hydraulic system:
     (a) FOR [1070GM] (HYD ACCU GREEN)
Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
     (b) FOR [3070GM] (HYD ACCU YELLOW)
Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
     (c) FOR [2070GM] (HYD ACCU BLUE)
Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).
   (2) Put WARNING NOTICE(S) in position to tell persons not to pressurize the applicable hydraulic system:
  • On the applicable ground service panel
  • On panel 40VU in the cockpit.
   (3) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE below the MLG bay.
4. Procedure
Subtask 12-14-29-614-052-A
A. Fill the Applicable Accumulator with Nitrogen
   (1) Do a check of the nitrogen pressure gage, before you fill the applicable accumulator:
     (a) If the nitrogen pressure is below correct nominal value, continue as follows:
       1 Remove the blanking cap (1) from the charging valve (2).
       2 Connect the 98F29103500000 FILL UNIT-NITROGEN or a nitrogen bench capable of maximum pressure 155 bar (2248.08 psi) to the charging valve (2).
NOTE: When you use the 98F29103500000 FILL UNIT-NITROGEN it is necessary to connect the Standard Tool female adapter 0.302" - 32 to the end of the hose of the nitrogen source, before you put it in the charging valve.
       3 Loosen the charging valve nut (2).
       4 Open the control valve slowly and fill the hydraulic power accumulator with the nitrogen Individual Compound-- Nitrogen Gaseous (Material No.14VGC1) to the correct pressure for the ambient temperature (refer to Table I), then continue with step (2).
deg.F
PSI
deg.C
PSI
-5
0
+5
+10
+15
+20
+25
+30
+35
+40
+45
+50
+55
+60
+65
+70
+75
+80
+85
+90
+95
+100
+105
+110
+115
+120
+125
+130
+135
+140
1570
1580
1595
1610
1620
1650
1680
1710
1725
1750
1775
1800
1820
1850
1870
1890
1920
1940
1970
1990
2010
2040
2060
2085
2105
2130
2145
2170
2195
2220
-20
-15
-10
-5
0
+5
+10
+15
+20
+25
+30
+35
+40
+45
+50
+55
+60
1570
1595
1620
1670
1710
1755
1800
1840
1890
1930
1970
2015
2060
2095
2130
2175
2220
Table I

     (b) If the nitrogen pressure is above correct nominal value, continue as follows:
       1 Remove the blanking cap (1) from the charging valve (2).
       2 Turn the charging valve nut (2) slowly in the direction of the OPEN position and release the nitrogen pressure to the correct pressure for the ambient temperature (refer to Table I), then continue with step (2).
deg.F
PSI
deg.C
PSI
-5
0
+5
+10
+15
+20
+25
+30
+35
+40
+45
+50
+55
+60
+65
+70
+75
+80
+85
+90
+95
+100
+105
+110
+115
+120
+125
+130
+135
+140
1570
1580
1595
1610
1620
1650
1680
1710
1725
1750
1775
1800
1820
1850
1870
1890
1920
1940
1970
1990
2010
2040
2060
2085
2105
2130
2145
2170
2195
2220
-20
-15
-10
-5
0
+5
+10
+15
+20
+25
+30
+35
+40
+45
+50
+55
+60
1570
1595
1620
1670
1710
1755
1800
1840
1890
1930
1970
2015
2060
2095
2130
2175
2220
Table I

   (2) Wait for approx 1 minute to make sure that the pressure in the bladder is stable.
   (3) When the pressure is stable and correct, tighten the charging valve nut (2).
   (4) TORQUE the charging valve nut (2) to between 60 and 50 lbf.in (0.68 and 0.57 m.daN ) T.
   (5) Make sure that the pressure shown on the pressure gage (3) is correct.
   (6) Stop the supply and remove the nitrogen filling system from the charging valve (2).
   (7) Loosely install the blanking cap (1) on the charging valve (2).
   (8) TORQUE the blanking cap (1) to between 10.0 and 5.0 lbf.in (0.11 and 0.06 m.daN ) T.
5. Close-up
Subtask 12-14-29-410-052-A
A. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the applicable access door/panel:
     (a) FOR [1070GM] (HYD ACCU GREEN)
Close the left MLG door (Ref. AMM TASK 32-12-00-410-001).
     (b) FOR [3070GM] (HYD ACCU YELLOW)
Close access panel 196BB.
     (c) FOR [2070GM] (HYD ACCU BLUE)
Close access panel 195BB.
Subtask 12-14-29-860-051-A
B. Put the aircraft back to the serviceable condition.
   (1) Remove the WARNING NOTICE(S).
   (2) Remove the access platform(s).
   (3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
[Rev.10 from 2021] 2026.03.31 22:55:50 UTC
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