DOC AIRBUS | AMM A320FNLG Shock Absorber Oil Replenishment and Nitrogen Filling (Aircraft on Wheels)
TASK 12-12-32-611-001-A
NLG Shock Absorber Oil Replenishment and Nitrogen Filling (Aircraft on Wheels)
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 12-12-32-941-050-A ** ON A/C NOT FOR ALL
Subtask 12-12-32-611-071-A ** ON A/C NOT FOR ALL
Subtask 12-12-32-942-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:56:24 UTC
NLG Shock Absorber Oil Replenishment and Nitrogen Filling (Aircraft on Wheels)
WARNING:
PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
WARNING:
OBEY THE HYDRAULIC SAFETY PROCEDURES.
WARNING:
DO NOT LET COMPRESSED GAS TOUCH YOUR SKIN. THE GAS CAN GO THROUGH THE SKIN AND MAKE BUBBLES IN THE BLOOD. THIS CONDITION CAN KILL YOU.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 711
1. Reason for the JobNOTE: If possible, it is recommended that the NLG shock absorber is replenished with the aircraft on jacks (Ref. Task 12-12-32-611-005-A).
NOTE: For the tasks completed with the A/C in a Weight-On-Wheels configuration, the A/C must be stable (no movement of people in the A/C).
NOTE: This procedure must be done a minimum of 2 hours after the last aircraft operation. This is to give time for the separation of the nitrogen from the oil in the shock absorber.
2. Job Set-up InformationA. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) |
| No specific | AR | CHARGING EQUIPMENT - FLUID, STANDARD |
| No specific | 1 | GAGE 200 BAR (2900 PSI) - PRESSURE |
| No specific | AR | GAGE 200 BAR (2900 PSI) - PRESSURE, HYDRAULIC |
| No specific | AR | NITROGEN COMPRESSED SOURCE - GROUND |
| No specific | 1 | RULER - STEEL |
| No specific | AR | SAFETY BARRIER(S) |
| No specific | 1 | THERMOMETER -45 TO 70 DEG.C (-49 TO 158 DEG.F) |
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 0.8 and 0.5 m.daN (70.80 and 44.25 lbf.in )  | |
| M21930 | 1 | FILLING ASSEMBLY |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.02BBB9) | Mineral Hydraulic Fluid-Damper - - |
| (Material No.02CBB1) | Mineral Hydraulic Fluid & Additives-Damper Shock Struts - |
| (Material No.02CCC1) | Mineral Hydraulic Fluid & Additives-Damper Landing Gear - |
| (Material No.14CCB6) | Testing Medium-Leak Detection - Oxygen System |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 711 | NOSE GEAR |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-12-32-610-001-A | Check NLG Shock Absorber Fluid Level and Charge Pressure ("Two-Point Check" - Aircraft on Jacks to start) |
| TASK 12-12-32-610-001-A-01 | Check NLG Shock Absorber Fluid Level and Charge Pressure ("Two-Point Check" - Aircraft on Ground to start) |
| TASK 12-12-32-610-002-A | Functional Check of NLG Shock Absorber Charge Pressure and Fluid Level |
| TASK 12-12-32-610-002-A-01 | Functional Check of NLG Shock Absorber Charge Pressure and Fluid Level |
| TASK 12-12-32-611-005-A | NLG Shock Absorber Oil Replenishment and Nitrogen Filling (Aircraft on Jacks) |
| TASK 32-00-00-481-001-A | Installation of the Safety Devices on the Landing Gears |
| TASK 32-00-00-481-002-A | Installation of the Safety Devices on the Landing Gear Doors |
| TASK 32-22-00-010-001-A | Nose Gear Doors - Ground Doors Opening |
| TASK 32-22-00-410-001-A | Nose Gear Doors - Ground Doors Closing |
NLG Shock Absorber Replenishment - Location and DetailSubtask 12-12-32-941-050-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU, make sure that the landing-gear control-lever (6GA) is in the DOWN position.
(4) Put a WARNING NOTICE(S) on panel 400VU, to tell persons not to operate the landing-gear controls.
(5) Put a WARNING NOTICE(S) in position to tell persons not to operate the NLG doors.
Subtask 12-12-32-941-050-B ** ON A/C NOT FOR ALL (1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
(2) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) On panel 400VU, make sure that the landing-gear control-lever (6GA) is in the DOWN position.
(4) Put a WARNING NOTICE(S) on panel 400VU, to tell persons not to operate the landing-gear controls.
(5) Put a WARNING NOTICE(S) in position to tell persons not to operate the NLG doors.
A. Not Applicable
Subtask 12-12-32-010-050-A ** ON A/C NOT FOR ALL B. Get Access
(2) Install the 98D32203502000 SAFETY PIN - NLG DOOR in the linkage of each forward NLG door (Ref. AMM TASK 32-00-00-481-002).
(3) Put the ACCESS PLATFORM 2M (6 FT) in position at the NLG.
4. ProcedureWARNING:
MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR DOORS ARE CLEAR.
(1) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001). (2) Install the 98D32203502000 SAFETY PIN - NLG DOOR in the linkage of each forward NLG door (Ref. AMM TASK 32-00-00-481-002).
(3) Put the ACCESS PLATFORM 2M (6 FT) in position at the NLG.
Subtask 12-12-32-611-071-A ** ON A/C NOT FOR ALL
A. Replenishment of the NLG Shock Absorber
(1) Replenish the NLG shock absorber with the aircraft on jacks (Ref. AMM TASK 12-12-32-611-005).
Subtask 12-12-32-614-074-A ** ON A/C NOT FOR ALL (1) Replenish the NLG shock absorber with the aircraft on jacks (Ref. AMM TASK 12-12-32-611-005).
B. Preparation for Replenishment
(a) Connect the hydraulic source hose (17) to the GAGE 200 BAR (2900 PSI) - PRESSURE, HYDRAULIC (16).
(b) Make sure that the control valves (13) and (19) of the three-way valve (12) are closed.
(c) Connect the hydraulic source hose (17) to the three-way valve (12).
(d) Connect the filling hose (11) to the three-way valve (12).
(f) Connect the filling hose (11) to the end fitting (2) of the M21930 FILLING ASSEMBLY.
(g) Connect the translucent bleed hose (14) between the three-way valve (12) and the drain container (15).
(i) Fill the hydraulic source (16) with Mineral Hydraulic Fluid-Damper - - (Material No.02BBB9) or Mineral Hydraulic Fluid & Additives-Damper Shock Struts - (Material No.02CBB1) or Mineral Hydraulic Fluid & Additives-Damper Landing Gear - (Material No.02CCC1) .
(a) Remove the blanking cap (7) from the charging valve (6).
(b) Move the wrench (9) up to the knurled shoulder (3) and install the M21930 FILLING ASSEMBLY on the charging valve (6).
(c) Turn the core (8) of the M21930 FILLING ASSEMBLY clockwise with the knurled shoulder (3).
(d) Install the seal (4) on the charging valve (6).
(3) Make sure that the charging equipment is correctly installed and does not leak.
(4) Deflate the NLG shock absorber as follows:
Subtask 12-12-32-611-053-A ** ON A/C NOT FOR ALL WARNING:
DO NOT GET HYDRAULIC FLUID ON YOUR SKIN, IN YOUR EYES OR IN YOUR MOUTH. HYDRAULIC FLUID IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY. FLUSH HYDRAULIC FLUID FROM YOUR EYES, MOUTH OR SKIN WITH WATER. GET MEDICAL AID IF YOU GET HYDRAULIC FLUID IN YOUR EYES OR MOUTH.
(1) Install the CHARGING EQUIPMENT - FLUID, STANDARD on the M21930 FILLING ASSEMBLY as follows: (a) Connect the hydraulic source hose (17) to the GAGE 200 BAR (2900 PSI) - PRESSURE, HYDRAULIC (16).
(b) Make sure that the control valves (13) and (19) of the three-way valve (12) are closed.
(c) Connect the hydraulic source hose (17) to the three-way valve (12).
(d) Connect the filling hose (11) to the three-way valve (12).
NOTE: It is recommended to use a filling hose (11) of less than 3 m (9.84 ft.) long. A filling hose length of more than 3 m (9.84 ft.) will decrease pressure measurement accuracy.
(e) Remove the blanking cap (1) and the plug (5) from the M21930 FILLING ASSEMBLY. (f) Connect the filling hose (11) to the end fitting (2) of the M21930 FILLING ASSEMBLY.
(g) Connect the translucent bleed hose (14) between the three-way valve (12) and the drain container (15).
CAUTION:
MAKE SURE THAT YOU USE A GAGE WITH THE SPECIFIED PRESSURE RANGE. THIS IS NECESSARY TO GET AN ACCURATE PRESSURE MEASUREMENT.
(h) Install the GAGE 200 BAR (2900 PSI) - PRESSURE (10) on the three-way valve (12). (i) Fill the hydraulic source (16) with Mineral Hydraulic Fluid-Damper - - (Material No.02BBB9) or Mineral Hydraulic Fluid & Additives-Damper Shock Struts - (Material No.02CBB1) or Mineral Hydraulic Fluid & Additives-Damper Landing Gear - (Material No.02CCC1) .
NOTE: Mineral Hydraulic Fluid-Damper - - (Material No.02BBB9) , Mineral Hydraulic Fluid & Additives-Damper Shock Struts - (Material No.02CBB1) and Mineral Hydraulic Fluid & Additives-Damper Landing Gear - (Material No.02CCC1) can be mixed in all applicable maintenance tasks and in all quantities.
(2) Install the M21930 FILLING ASSEMBLY on the charging valve (6) as follows: (a) Remove the blanking cap (7) from the charging valve (6).
(b) Move the wrench (9) up to the knurled shoulder (3) and install the M21930 FILLING ASSEMBLY on the charging valve (6).
(c) Turn the core (8) of the M21930 FILLING ASSEMBLY clockwise with the knurled shoulder (3).
(d) Install the seal (4) on the charging valve (6).
(3) Make sure that the charging equipment is correctly installed and does not leak.
(4) Deflate the NLG shock absorber as follows:
WARNING:
MAKE SURE THAT THE AREA AROUND THE AIRCRAFT IS CLEAR OF PERSONS AND EQUIPMENT. WHEN YOU PRESSURIZE/DEPRESSURIZE THE SHOCK ABSORBER, WITH THE AIRCRAFT WEIGHT ON THE GROUND, THE AIRCRAFT WILL MOVE.
WARNING:
DO NOT LET COMPRESSED GAS TOUCH YOUR SKIN. THE GAS CAN GO THROUGH THE SKIN AND MAKE BUBBLES IN THE BLOOD. THIS CONDITION CAN KILL YOU.
(a) Move the wrench (9) down and slowly turn counterclockwise to open the charging valve (6). NOTE: In the step that follows, make sure that you deflate the NLG shock absorber slowly:
(b) Slowly open the control valve (13) on the three-way valve (12) to release the nitrogen pressure. This will let the NLG shock absorber fully deflate. - To prevent possible shock when the NLG shock absorber gets to the lower limit of its travel
- To not let the gas mix with the oil in the NLG shock absorber.
NOTE: The pressure gage (10) will show approximately 1 bar (15 psi) when the NLG shock absorber is fully deflated.
(c) When all the nitrogen pressure is released, close the control valve (13) of the three-way valve (12). C. Replenishment of the NLG Shock Absorber
(b) Operate the hydraulic power-supply inflation bench (16) and slowly open the control valve (19) on the three-way valve (12).
(c) Bleed the filling hose (11) with hydraulic fluid.
(d) Close the control valve (19) on the three-way valve (12).
(e) Connect the filling hose (11) to the M21930 FILLING ASSEMBLY.
(f) Open the control valve (19) of the three-way valve (12).
(i) Do not continue the procedure for a minimum of 10 minutes. This will make sure that all air is isolated from the hydraulic fluid.
(j) Slowly open the control valve (13) on the three-way valve (12).
(l) Keep the NLG shock absorber compressed fully and close the control valve (13) on the three-way valve (12).
(m) Make sure that hydraulic fluid is released from the NLG shock absorber during the shock absorber compression.
1 If hydraulic fluid is not released, do steps (1)(g) to (1)(m) again.
(n) Make sure the fluid released from the shock absorber through the translucent bleed hose (14) does not contain gas bubbles or emulsion.
1 If gas bubbles or emulsion are found, do steps (1)(g) to (1)(n) again.
(o) Turn the wrench (9) clockwise to close the charging valve (6).
(p) Open the control valve (13) on the three-way valve (12).
(q) Disconnect the hydraulic source hose (17) from the three-way valve (12).
(r) Disconnect the filling hose (11) from the M21930 FILLING ASSEMBLY. Put the free end of the filling hose (11) in the drain container (15) to drain the hydraulic fluid.
(s) Close the control valve (13) on the three-way valve (12).
(t) Remove the translucent bleed hose (14) from the three-way valve (12).
(2) Fill the NLG shock absorber with nitrogen gas, as follows:
(b) Open the control valve (19) on the three-way valve (12).
(c) Slowly open the control valve of the nitrogen source to release nitrogen pressure and bleed the circuit with dry nitrogen.
(d) Close the control valve of the nitrogen source.
(e) Close the control valve (19) on the three-way valve (12).
(f) Connect the filling hose (11) to the M21930 FILLING ASSEMBLY.
(g) Use a THERMOMETER -45 TO 70 DEG.C (-49 TO 158 DEG.F) to measure and record the temperature of the NLG shock absorber adjacent to the charging valve (6). Make sure that the thermometer touches the NLG shock absorber outer-cylinder. If possible, measure the temperature at the top part of the cylinder (through the vent hole) at the aft part of the main fitting.
(h) Open the control valve of the nitrogen source.
(i) Turn the wrench (9) counterclockwise to open the charging valve (6).
(j) Slowly open the control valve (19) on the three-way valve (12) to inflate the NLG shock absorber with nitrogen. Do this until dimension H is 30 mm (1.1811 in.).
(k) Close the control valve (19) on the three-way valve (12) and close the control valve of the nitrogen source.
(l) Let the pressure become stable, open the control valve (19) after fifteen minutes to record the pressure. When the pressure is recorded, close the control valve (19).
(m) Refer to the pressure/temperature/stroke table for the correct dimension H for the recorded temperature and pressure values.
(n) Open the control valve of the nitrogen source. Slowly open the control valve (19) on the three-way valve (12) to inflate the NLG shock absorber. Do this until you get the correct dimension H plus 30 mm (1.1811 in.).
(o) Close the control valve (19) on the three-way valve (12) and close the control valve of the nitrogen supply.
(p) Let the pressure become stable, continue after 15 minutes.
(q) Slowly open the control valve (13) on the three-way valve (12) to deflate the NLG shock absorber. Do this until you get the correct dimension H value given in step (2)(m).
(r) Close the control valve (13) on the three-way valve (12).
(s) Continue after a minimum of ten minutes.
(t) Open the control valve (19) on the three-way valve (12) and measure:
(v) Turn the wrench (9) clockwise to close the charging valve (6). Close the control valve (19) and open the control valve (13) to release the nitrogen from the filling system.
(w) Remove the filling hose (11) from the M21930 FILLING ASSEMBLY.
(x) Remove the M21930 FILLING ASSEMBLY from the charging valve (6).
(y) TORQUE the charging valve (6) to between 0.8 and 0.5 m.daN (70.80 and 44.25 lbf.in ).
(z) Use Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to do a leak check of the charging valve (6).
(aa) Install the blanking cap (7) on the charging valve (6).
5. Close-upWARNING:
MAKE SURE THAT THE AREA AROUND THE AIRCRAFT IS CLEAR OF PERSONS AND EQUIPMENT. WHEN YOU PRESSURIZE/DEPRESSURIZE THE SHOCK ABSORBER, WITH THE AIRCRAFT WEIGHT ON THE GROUND, THE AIRCRAFT WILL MOVE.
WARNING:
DO NOT GET HYDRAULIC FLUID ON YOUR SKIN, IN YOUR EYES OR IN YOUR MOUTH. HYDRAULIC FLUID IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY. FLUSH HYDRAULIC FLUID FROM YOUR EYES, MOUTH OR SKIN WITH WATER. GET MEDICAL AID IF YOU GET HYDRAULIC FLUID IN YOUR EYES OR MOUTH.
WARNING:
MAKE SURE THAT THERE ARE NO PERSONS OR EQUIPMENT NEAR THE L/G SHOCK ABSORBER DURING REPLENISHMENT. THERE IS A RISK THAT PRESSURIZED GASES OR FLUID CAN ESCAPE AND CAUSE INJURY OR DAMAGE.
CAUTION:
WHEN YOU FILL THE SHOCK ABSORBER, MAKE SURE TO STOP THE FLUID SUPPLY IMMEDIATELY AFTER THE SHOCK ABSORBER MOVES TO ITS LIMITS. THIS WILL PREVENT INTERNAL DAMAGE CAUSED BY OVERPRESSURE.
(1) Fill the NLG shock absorber with Mineral Hydraulic Fluid-Damper - - (Material No.02BBB9) or Mineral Hydraulic Fluid & Additives-Damper Shock Struts - (Material No.02CBB1) or Mineral Hydraulic Fluid & Additives-Damper Landing Gear - (Material No.02CCC1) as follows: NOTE: Mineral Hydraulic Fluid-Damper - - (Material No.02BBB9) , Mineral Hydraulic Fluid & Additives-Damper Shock Struts - (Material No.02CBB1) and Mineral Hydraulic Fluid & Additives-Damper Landing Gear - (Material No.02CCC1) can be mixed in all applicable maintenance tasks and in all quantities.
(a) Disconnect the filling hose (11) from the M21930 FILLING ASSEMBLY. Put the free end of the filling hose (11) in the drain container (15). (b) Operate the hydraulic power-supply inflation bench (16) and slowly open the control valve (19) on the three-way valve (12).
(c) Bleed the filling hose (11) with hydraulic fluid.
(d) Close the control valve (19) on the three-way valve (12).
(e) Connect the filling hose (11) to the M21930 FILLING ASSEMBLY.
(f) Open the control valve (19) of the three-way valve (12).
WARNING:
MAKE SURE THE AIRCRAFT IS STABLE AND CANNOT TILT ON TO ITS TAIL.
(g) Operate the hydraulic power-supply inflation bench (16) and slowly fill the NLG shock absorber with fluid. Fill the NLG shock absorber with fluid until it is fully extended. NOTE: This will lift the nose of the aircraft.
NOTE: When the NLG shock absorber is fully extended, dimension H is 449 mm (17.6772 in.) plus or minus 2 mm (0.0787 in.). Use an applicable RULER - STEEL to measure dimension H.
(h) Close the control valve (19) on the three-way valve (12). (i) Do not continue the procedure for a minimum of 10 minutes. This will make sure that all air is isolated from the hydraulic fluid.
(j) Slowly open the control valve (13) on the three-way valve (12).
NOTE: In the steps that follow, make sure that you compress the NLG shock absorber slowly:
(k) Let the hydraulic fluid drain into the drain container (15) until the NLG shock absorber is fully compressed. - This is to prevent possible shock when the NLG shock absorber gets to the limit of its travel
- To not let the gas mix with the oil in the NLG shock absorber.
(l) Keep the NLG shock absorber compressed fully and close the control valve (13) on the three-way valve (12).
(m) Make sure that hydraulic fluid is released from the NLG shock absorber during the shock absorber compression.
1 If hydraulic fluid is not released, do steps (1)(g) to (1)(m) again.
(n) Make sure the fluid released from the shock absorber through the translucent bleed hose (14) does not contain gas bubbles or emulsion.
1 If gas bubbles or emulsion are found, do steps (1)(g) to (1)(n) again.
(o) Turn the wrench (9) clockwise to close the charging valve (6).
(p) Open the control valve (13) on the three-way valve (12).
(q) Disconnect the hydraulic source hose (17) from the three-way valve (12).
(r) Disconnect the filling hose (11) from the M21930 FILLING ASSEMBLY. Put the free end of the filling hose (11) in the drain container (15) to drain the hydraulic fluid.
(s) Close the control valve (13) on the three-way valve (12).
(t) Remove the translucent bleed hose (14) from the three-way valve (12).
(2) Fill the NLG shock absorber with nitrogen gas, as follows:
WARNING:
DO NOT LET COMPRESSED GAS TOUCH YOUR SKIN. THE GAS CAN GO THROUGH THE SKIN AND MAKE BUBBLES IN THE BLOOD. THIS CONDITION CAN KILL YOU.
CAUTION:
ALWAYS ADD NITROGEN SLOWLY WHEN YOU PRESSURIZE THE SHOCK ABSORBER. IF YOU ADD THE NITROGEN TOO QUICKLY, THE TEMPERATURE WILL INCREASE AND HAVE AN EFFECT ON THE SHOCK ABSORBER PRESSURE.
(a) Connect the nitrogen source hose (18) of the NITROGEN COMPRESSED SOURCE - GROUND to the three-way valve (12). (b) Open the control valve (19) on the three-way valve (12).
(c) Slowly open the control valve of the nitrogen source to release nitrogen pressure and bleed the circuit with dry nitrogen.
(d) Close the control valve of the nitrogen source.
(e) Close the control valve (19) on the three-way valve (12).
(f) Connect the filling hose (11) to the M21930 FILLING ASSEMBLY.
(g) Use a THERMOMETER -45 TO 70 DEG.C (-49 TO 158 DEG.F) to measure and record the temperature of the NLG shock absorber adjacent to the charging valve (6). Make sure that the thermometer touches the NLG shock absorber outer-cylinder. If possible, measure the temperature at the top part of the cylinder (through the vent hole) at the aft part of the main fitting.
(h) Open the control valve of the nitrogen source.
(i) Turn the wrench (9) counterclockwise to open the charging valve (6).
(j) Slowly open the control valve (19) on the three-way valve (12) to inflate the NLG shock absorber with nitrogen. Do this until dimension H is 30 mm (1.1811 in.).
(k) Close the control valve (19) on the three-way valve (12) and close the control valve of the nitrogen source.
(l) Let the pressure become stable, open the control valve (19) after fifteen minutes to record the pressure. When the pressure is recorded, close the control valve (19).
(m) Refer to the pressure/temperature/stroke table for the correct dimension H for the recorded temperature and pressure values.
(n) Open the control valve of the nitrogen source. Slowly open the control valve (19) on the three-way valve (12) to inflate the NLG shock absorber. Do this until you get the correct dimension H plus 30 mm (1.1811 in.).
(o) Close the control valve (19) on the three-way valve (12) and close the control valve of the nitrogen supply.
(p) Let the pressure become stable, continue after 15 minutes.
(q) Slowly open the control valve (13) on the three-way valve (12) to deflate the NLG shock absorber. Do this until you get the correct dimension H value given in step (2)(m).
(r) Close the control valve (13) on the three-way valve (12).
(s) Continue after a minimum of ten minutes.
(t) Open the control valve (19) on the three-way valve (12) and measure:
- The pressure shown on the pressure gage (10)
- Dimension H.
(v) Turn the wrench (9) clockwise to close the charging valve (6). Close the control valve (19) and open the control valve (13) to release the nitrogen from the filling system.
(w) Remove the filling hose (11) from the M21930 FILLING ASSEMBLY.
(x) Remove the M21930 FILLING ASSEMBLY from the charging valve (6).
(y) TORQUE the charging valve (6) to between 0.8 and 0.5 m.daN (70.80 and 44.25 lbf.in )
. (z) Use Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to do a leak check of the charging valve (6).
(aa) Install the blanking cap (7) on the charging valve (6).
Subtask 12-12-32-942-050-A ** ON A/C NOT FOR ALL
A. Removal of Support Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform.
Subtask 12-12-32-942-050-B ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform.
A. Not Applicable
Subtask 12-12-32-410-050-A ** ON A/C NOT FOR ALL B. Close Access
(1) Remove the 98D32203502000 SAFETY PIN - NLG DOOR from the linkage of each forward NLG door (Ref. AMM TASK 32-00-00-481-001).
(2) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).
Subtask 12-12-32-942-051-A ** ON A/C NOT FOR ALL (1) Remove the 98D32203502000 SAFETY PIN - NLG DOOR from the linkage of each forward NLG door (Ref. AMM TASK 32-00-00-481-001).
(2) Close the NLG doors (Ref. AMM TASK 32-22-00-410-001).
C. Removal of Equipment
(1) Remove the SAFETY BARRIER(S).
(2) Disassemble the standard charging equipment.
(3) Remove the WARNING NOTICE(S).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
Subtask 12-12-32-280-050-A ** ON A/C NOT FOR ALL (1) Remove the SAFETY BARRIER(S).
(2) Disassemble the standard charging equipment.
(3) Remove the WARNING NOTICE(S).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
D. Nitrogen Dissolving Compensation
(1) Do a check of the NLG shock absorber fluid level and charge pressure (Ref. AMM TASK 12-12-32-610-001) or (Ref. AMM TASK 12-12-32-610-002). The check must be done between four and seven days after the first subsequent flight.
(1) Do a check of the NLG shock absorber fluid level and charge pressure (Ref. AMM TASK 12-12-32-610-001) or (Ref. AMM TASK 12-12-32-610-002). The check must be done between four and seven days after the first subsequent flight.
NOTE: This check is necessary because the nitrogen will mix with the oil and cause the pressure to decrease.