W DOC AIRBUS | AMM A320F

Replacement of the Cap Screws of the NLG-Door Ground-Opening Bypass-Valve

TASK 32-31-15-960-801-A
Replacement of the Cap Screws of the NLG-Door Ground-Opening Bypass-Valve

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
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.
MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.
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: OBEY THE HYDRAULIC SAFETY PROCEDURES.
ZONE: 124
1. Reason for the Job
This task must only be used for the replacement of cap screws that are in the correct condition.
If the NLG Bypass-Valve has a hydraulic leak, or one or more of the cap screws are damaged, the valve must be:
  • Removed, inspected and repaired or replaced.
    This task is only applicable to NLG Bypass-Valves that have part numbers:
  • 114087001, 114087002, 114087003, 114087004, 114087005, 114087006, 114087007 and 114087008.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific
AR
SAFETY BARRIER(S)
No specific
AR
WARNING NOTICE(S)
No specific
Torque wrench: range to between 0.33 and 0.27 m.daN (29.20 and 23.89 lbf.in ) T
No specific
Torque wrench: range to between 0.737 and 0.603 m.daN (65.22 and 53.36 lbf.in ) T
No specific
Torque wrench: range to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in ) T
98A32301013000
1
RIGGING PIN
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.14QFB1)
Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
124
NOSE GEAR WELL
197CB
 D. Expendable Parts
FIG.ITEM
DESIGNATION
IPC-CSN
13
COTTER PIN
AIPC 32-31-01-09-010
3
COTTER PIN
AIPC 32-31-01-10-030
1
CAP SCREW
AIPC 32-31-15-01-010
13
COTTER PIN
AIPC 32-31-81-09-010
3
COTTER PIN
AIPC 32-31-81-10-050
 E. Referenced Information
REFERENCE
DESIGNATION
TASK 12-12-29-611-001-A
Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A
Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
TASK 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-10-00-863-001-A
Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-864-001-A
Depressurize the Green Hydraulic System
TASK 29-14-00-614-001-A
Depressurization of the Hydraulic Reservoirs
TASK 29-23-00-863-001-A
Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
TASK 29-23-00-864-001-A
Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
TASK 32-00-00-481-001-A
Installation of the Safety Devices on the Landing Gears
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
TASK 32-31-00-710-002-A
Operational Test of the Landing Gear Doors (With False Targets)
TASK 32-31-00-710-002-A-01
Operational Test of the Landing Gear Doors (Without False Targets)
F NLG Door Ground-Opening Bypass-Valve
3. Job Set-up
Subtask 32-31-15-860-052-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the Green hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001)
   (2) Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001)
   (3) After you depressurize the reservoir of the Green hydraulic system, wait a minimum of 20 minutes before you do the procedure that follows.
Subtask 32-31-15-941-053-A
B. Safety Precautions
   (1) In the cockpit, on the right-center instrument-panel 400VU, put a WARNING NOTICE(S) in position to tell persons not to operate the landing-gear control lever.
   (2) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system:
  • On panel 40VU in the cockpit
  • On the ground service panel of the Green hydraulic system, at the access door 197CB.
   (3) Put the SAFETY BARRIER(S) in position.
   (4) Make sure that the ground safety locks are installed on the landing gear (Ref. AMM TASK 32-00-00-481-001).
Subtask 32-31-15-010-051-A
C. Get Access
   (1) Open the doors of the nose landing gear (Ref. AMM TASK 32-22-00-010-001).
   (2) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position in zone 123.
4. Procedure
Subtask 32-31-15-020-052-A
A. Removal of the Lever
WARNING: MAKE SURE THAT THE NLG DOWNLOCK SAFETY PIN AND THE TWO DOOR SAFETY PINS ARE INSTALLED.
   (1) Remove and discard the cotter pin (13).
   (2) Remove the nut (12) and washer (11).
   (3) Remove the bolt (8) and disconnect the rod (6).
   (4) Remove and discard the cotter pin (3).
   (5) Remove the nut (4) and washer (5).
   (6) Remove the screw (10) and lever (9).
Subtask 32-31-15-960-050-A
B. Replacement of the Cap Screws of the NLG-Door Ground-Opening Bypass-Valve
WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
   (1) Remove the cap screw (1)
NOTE: You must not remove and replace more than one cap screw (1) at a time.
     (a) Remove and discard the lockwire from the cap screw (1).
     (b) Remove the cap screw (1).
   (2) Install a new AIPC 32-31-15-01-010 CAP SCREW (1).
   (3) Torque the new cap screw (1):
     (a) For the NLG-door ground-opening bypass-valves part numbers 114087001, 114087002, 114087003, 11408704 or 114087005, TORQUE the new cap screw (1) to between 0.33 and 0.27 m.daN (29.20 and 23.89 lbf.in ) T.
     (b) For the NLG-door ground-opening bypass-valves part numbers 114087001, 114087002, 114087003 or 11408704 identified with SB526, TORQUE the new cap screw (1) to between 0.737 and 0.603 m.daN (65.22 and 53.36 lbf.in ) T.
     (c) For the NLG-door ground-opening bypass-valves part numbers 114087006, 114087007, 114087008, TORQUE the new cap screw (1) to between 0.737 and 0.603 m.daN (65.22 and 53.36 lbf.in ) T.
   (4) Do steps (1) thru (3) for each one of the other three cap screws (1).
     (a) Only replace one cap screw (1) at a time.
   (5) Safety the cap screws (1) in pairs with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
Subtask 32-31-15-420-053-A
C. Installation of the Lever
WARNING: MAKE SURE THAT THE NLG DOWNLOCK SAFETY PIN AND THE TWO DOOR SAFETY PINS ARE INSTALLED.
   (1) Install the lever (9), screw (10), washer (5) and nut (4).
   (2) TORQUE the nut (4) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in ) T and safety it with the new AIPC 32-31-01-10-030 COTTER PIN (3) or AIPC 32-31-81-10-050 COTTER PIN (3).
Subtask 32-31-15-420-054-A
D. Connection of the Rod
WARNING: MAKE SURE THAT THE NLG DOWNLOCK SAFETY PIN AND THE TWO DOOR SAFETY PINS ARE INSTALLED.
   (1) Pressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-863-001) or (Ref. AMM TASK 29-23-00-863-001).
   (2) Move the lever (9) to doors closed position.
   (3) Install the 98A32301013000 RIGGING PIN (7) on the selector valve (2).
   (4) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001) or (Ref. AMM TASK 29-23-00-864-001).
   (5) Put the door ground-opening control-handle in the closed position and put the safety pin in position.
   (6) Put the rod (6) in position and install the bolt (8).
   (7) Install the washer (11) and nut (12).
   (8) TORQUE the nut (12) to between 0.8 and 0.7 m.daN (70.80 and 61.95 lbf.in ) T and safety it with the new AIPC 32-31-01-09-010 COTTER PIN (13) or AIPC 32-31-81-09-010 COTTER PIN (13).
   (9) Remove the 98A32301013000 RIGGING PIN (7).
Subtask 32-31-15-941-054-A
E. Prepare for the Test
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the safety pin from the door ground-opening handle.
   (3) Put the door ground-opening handle in the open position.
   (4) Install the safety pin on the handle.
   (5) Make sure that the travel ranges of the NLG doors are clear.
   (6) Remove the access platform(s).
Subtask 32-31-15-710-051-A
F. Operational Test
   (1) Do an operational test of the applicable NLG door (Ref. AMM TASK 32-31-00-710-002).
NOTE: The operational test is only for the NLG doors opening bypass-valve that you installed or on which you did maintenance. The operational test on all the doors is optional.
Subtask 32-31-15-720-051-A
G. Functional Test
   (1) Do five full DOOR CLOSE/DOOR OPEN cycles (Ref. AMM TASK 32-22-00-410-001) (Ref. AMM TASK 32-22-00-010-001).
   (2) Make sure that there are no malfunctions during these operations.
   (3) Open the NLG doors (Ref. AMM TASK 32-22-00-010-001).
   (4) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the NLG-door ground-opening bypass-valve (2533GM).
   (5) Make sure that there are no leaks at the NLG-door ground-opening bypass-valve.
   (6) If necessary, fill the reservoir of the Green hydraulic system to the correct level (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
5. Close-up
Subtask 32-31-15-410-051-A
A. Close Access
   (1) Remove the WARNING NOTICE(S).
   (2) Remove the access platform(s).
   (3) Make sure that the work area is clean and clear of tools and other items.
   (4) Close the doors of the nose landing gear (Ref. AMM TASK 32-22-00-410-001).
[Rev.10 from 2021] 2026.04.01 00:44:30 UTC
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