W DOC AIRBUS | AMM A320F

Removal of the MLG Hydraulic Dressings

TASK 32-11-12-000-001-A
Removal of the MLG Hydraulic Dressings

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.
ZONE: 731
ZONE: 741
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)
No specific
2
CONTAINER 1 L (1/4 USGAL)
No specific
AR
PLUG - BLANKING
No specific
AR
SAFETY BARRIER(S)
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WARNING NOTICE(S)
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
731
L.H MAIN GEAR
741
R.H MAIN GEAR
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 24-41-00-862-002-A
De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01
De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02
De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-00-00-910-002-A
Safety Procedures of the Hydraulic System
TASK 29-10-00-864-002-A
Depressurize the Yellow Hydraulic System
TASK 29-14-00-614-001-A
Depressurization of the Hydraulic Reservoirs
TASK 29-23-00-860-001-A
Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 32-00-00-481-001-A
Installation of the Safety Devices on the Landing Gears
TASK 32-00-00-860-001-A
Flight Configuration Precautions with Electrical Power
TASK 32-00-00-860-001-A-01
Flight Configuration Precautions without Electrical Power
TASK 32-11-11-000-001-A
Removal of the MLG Leg Assembly
TASK 32-42-27-000-001-A
Removal of the Brake
F MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
F MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
F MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
F MLG Hydraulic Dressings (MLG with One-Piece Hydraulic Transfer-Block Assembly)
3. Job Set-up
Subtask 32-11-12-941-053-A
A. Safety Precautions
   (1) As necessary, use the applicable SAFETY BARRIERS, specified by the operator's instructions and your local regulations.
   (2) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
   (3) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
   (4) On panel 400VU:
  • Make sure that the landing-gear control-lever 6GA is in the DOWN position
  • Put a WARNING NOTICE(S) in position to tell persons not to operate the landing gear.
   (5) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green and the Yellow hydraulic systems.
Subtask 32-11-12-860-053-A
B. Aircraft Maintenance Configuration
   (1) Disconnect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-001).
   (2) Make sure that the Yellow and Green hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001) and (Ref. AMM TASK 29-10-00-864-002).
   (3) Depressurize the Green and Yellow hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-001).
   (4) If the electrical power is not necessary for other maintenance tasks, de-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002). Then, it is not necessary to operate the LGCIU circuit breakers.
   (5) If the electrical power is necessary, do the precautions for flight configuration (Ref. AMM TASK 32-00-00-860-001) before you open the LGCIU circuit breakers.
Subtask 32-11-12-865-050-A
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUL/G/LGCIU/SYS1/NORM1GAC09
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR33
121VULGCIU/BAT SPLY/SYS158GAR32
** ON A/C ALL
121VUHYDRAULIC/BRAKING AND STEERING/SYS2/SPLY4GGM36
121VUHYDRAULIC/BRAKING AND STEERING/SYS2/CTL3GGM35
121VUHYDRAULIC/BRAKING AND STEERING/SYS1/CTL1GGM34
121VUHYDRAULIC/PARK BRK/CTL/STBY71GGN37
121VUHYDRAULIC/PARK BRK/CTL/NORM70GGN36
121VUHYDRAULIC/LGCIU/SYS22GAQ35
121VUHYDRAULIC/LGCIU/SYS1/GRND SPLY52GAQ34
** ON A/C NOT FOR ALL
121VULGCIU/BAT SPLY/SYS259GAR32
121VULGCIU/BAT SPLY/SYS158GAR31
Subtask 32-11-12-010-050-D ** ON A/C NOT FOR ALL
D. Get Access
WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
  • FLUSH IT AWAY WITH CLEAN WATER
  • GET MEDICAL AID.
CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.
   (1)
F MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL



Put the ACCESS PLATFORM 2M (6 FT) in position at the applicable zone 731(741).
   (2) Put the 2 CONTAINER 1 L (1/4 USGAL) below the unions (1), (14), (15) and (28).
   (3) Disconnect the hydraulic hoses (29), (32), (65) and (66) at the MLG/airframe interface (Ref. AMM TASK 32-11-11-000-001).
   (4) Disconnect the applicable hydraulic hoses at the MLG/wheel brake interface (Ref. AMM TASK 32-42-27-000-001).
   (5) Put the PLUG-BLANKING in each disconnected line end.
Subtask 32-11-12-010-050-F ** ON A/C NOT FOR ALL
D. Get Access
WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
  • FLUSH IT AWAY WITH CLEAN WATER
  • GET MEDICAL AID.
CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.
   (1)
F MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
F MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
F MLG Hydraulic Dressings (MLG with One-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
Put the ACCESS PLATFORM 2M (6 FT) in position at the applicable zone 731(741).
   (2) Put the CONTAINER 1 L (1/4 USGAL) below the unions (1), (13), (14) and (26).
   (3) Disconnect the hydraulic hoses (29), (32), (65) and (66) at the MLG/airframe interface (Ref. AMM TASK 32-11-11-000-001).
   (4) Disconnect the applicable hydraulic hoses at the MLG/wheel brake interface (Ref. AMM TASK 32-42-27-000-001).
   (5) Put the PLUG-BLANKING in each disconnected line end.
4. Procedure
Subtask 32-11-12-020-050-F ** ON A/C NOT FOR ALL
WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
  • FLUSH IT AWAY WITH CLEAN WATER
  • GET MEDICAL AID.
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.
WARNING: USE PROTECTIVE GOGGLES WHEN YOU REMOVE OR INSTALL A COTTER PIN. EACH TIME YOU REMOVE A COTTER PIN DURING THE TASK, DISCARD IT IMMEDIATELY. A LOOSE COTTER PIN CAN CUT YOU OR MAKE YOU BLIND.
CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.
A. Removal of the MLG Hydraulic Dressings (MLG with the Four-Piece Hydraulic Transfer-Block Assembly)
F MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
   (1) Install the PLUG - BLANKING immediately after you remove the applicable flexible hydraulic hoses and rigid pipes.
   (2) To remove the flexible hydraulic hoses, do the steps that follow:
     (a) If necessary, remove and discard the lockwire from the unions (1), (14), (15) and (28).
     (b) Loosen the unions (1), (14), (15) and (28) to let the hydraulic fluid drain.
     (c) If the cotter pins (8) are installed, remove and discard them.
     (d) Remove the nuts (7), the washers (6), the bolts (3), the washers (4) and the block assemblies (5).
     (e) Disconnect the unions (1) and (14). Remove the flexible hoses (2) and (13).
     (f) If the cotter pins (19) are installed, remove and discard them.
     (g) Remove the nuts (20), the washers (21), the bolts (17), the washers (18) and the block assemblies (22).
     (h) Disconnect the unions (15) and (28). Remove the flexible hoses (16) and (27).
     (i) Remove the nuts (33), the washers (34) and the bolts (36). Remove the block assemblies (35).
     (j) Remove and discard the cotter pin (41).
     (k) Remove the nuts (40), the washers (39) and the bolts (37). Remove the channels (38).
     (l) Disconnect the unions (23) and (71) and remove the flexible hose (24).
     (m) Disconnect the unions (26) and (72) and remove the flexible hose (25).
     (n) Disconnect the unions (10) and (74) and remove the flexible hose (9).
     (o) Disconnect the unions (12) and (75) and remove the flexible hose (11)
     (p) Disconnect the union (30) and remove the flexible hose (29).
     (q) Disconnect the union (31) and remove the flexible hose (32).
     (r) Disconnect the union (59) and remove the flexible hose (66).
     (s) Disconnect the union (60) and remove the flexible hose (65).
   (3) To remove the rigid hydraulic pipes, do the steps that follow:
     (a) Remove and discard the lockwire from the band-clamp nuts (91).
     (b) Loosen the nuts (91) sufficiently to remove the band-clamps (92) from the line support blocks.
       1 Make sure that the mystic tape and the blocks stay in position when the band-clamps (92) are removed.
     (c) Disconnect the unions (67) and (79) and remove the pipe (68).
     (d) Disconnect the unions (70) and (78) and remove the pipe (69).
     (e) Disconnect the union (77) and remove the locknut (57). Remove the pipe (56).
     (f) Disconnect the union (80) and remove the locknut (58). Remove the pipe (55).
     (g) Remove the locknut (76) and disconnect the union (64). Remove the pipe (63).
     (h) Remove the locknut (73) and disconnect the union (61). Remove the pipe (62).
Subtask 32-11-12-020-050-J ** ON A/C NOT FOR ALL
WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
  • FLUSH IT AWAY WITH CLEAN WATER
  • GET MEDICAL AID.
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.
CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.
A. Removal of the MLG Hydraulic Dressings (MLG with the Four-Piece Hydraulic Transfer-Block Assembly)
F MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
   (1) Install a PLUG - BLANKING immediately after you remove the applicable flexible hydraulic hoses and the rigid pipes.
   (2) To remove the flexible hydraulic hoses, do the steps that follow:
     (a) Remove and discard the lockwire from the unions (1), (13), (14) and (26).
     (b) Loosen the unions (1), (13), (14) and (26) to let the hydraulic fluid drain.
     (c) Remove the nuts (7), the washers (6), the bolts (3), the washers (4) and the line-support block assemblies (5).
     (d) Disconnect the unions (1) and (13). Remove the flexible hoses (2) and (12).
     (e) Remove the nuts (18), the washers (19), the bolts (16), the washers (17) and the line-support block assemblies (20).
     (f) Disconnect the unions (14) and (26). Remove the flexible hoses (15) and (25).
     (g) Remove the nuts (33), the washers (34) and the bolts (36). Remove the block assemblies (35).
     (h) Remove the nuts (40), the washers (39) and the bolts (37). Remove the guide blocks (38).
     (i) Disconnect the unions (21) and (71) and remove the flexible hose (22).
     (j) Disconnect the unions (24) and (72) and remove the flexible hose (23).
     (k) Disconnect the unions (9) and (74) and remove the flexible hose (8).
     (l) Disconnect the unions (11) and (75) and remove the flexible hose (10).
     (m) Disconnect the union (30) and remove the flexible hose (29).
     (n) Disconnect the union (31) and remove the flexible hose (32).
     (o) Disconnect the union (59) and remove the flexible hose (66).
     (p) Disconnect the union (60) and remove the flexible hose (65).
   (3) To remove the rigid hydraulic pipes, do the steps that follow:
     (a) Remove and discard the lockwire from the band clamp nuts (91).
     (b) Loosen the band clamp nuts (91) sufficiently to remove the band clamps (92) from the line support blocks.
       1 Make sure that the mystic tape and the line support blocks stay in position when the band clamps (92) are removed.
     (c) Disconnect the unions (67) and (79) and remove the pipe (68).
     (d) Disconnect the unions (70) and (78) and remove the pipe (69).
     (e) Disconnect the union (77) and remove the nut (57). Remove the pipe (56).
     (f) Disconnect the union (80) and remove the nut (58). Remove the pipe (55).
     (g) Remove the nut (76) and disconnect the union (64). Remove the pipe (63).
     (h) Remove the nut (73) and disconnect the union (61). Remove the pipe (62).
Subtask 32-11-12-020-050-K ** ON A/C NOT FOR ALL
WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
  • FLUSH IT AWAY WITH CLEAN WATER
  • GET MEDICAL AID.
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.
CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.
A. Removal of the MLG Hydraulic Dressings (MLG with the Four-Piece Hydraulic Transfer-Block Assembly)
F MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
   (1) Install a PLUG - BLANKING immediately after you remove the applicable flexible hydraulic hoses and the rigid pipes.
   (2) To remove the flexible hydraulic hoses, do the steps that follow:
     (a) Remove and discard the lockwire from the unions (1), (13), (14) and (26).
     (b) Loosen the unions (1), (13), (14) and (26) to let the hydraulic fluid drain.
     (c) Remove the nuts (7), the washers (6), the bolts (3), the washers (4) and the line-support block assemblies (5).
     (d) Disconnect the unions (1) and (13).
     (e) Remove the flexible hoses (2) and (12).
     (f) Remove the nuts (18), the washers (19), the bolts (16), the washers (17) and the line-support block assemblies (20).
     (g) Disconnect the unions (14) and (26).
     (h) Remove the flexible hoses (15) and (25).
     (i) Remove the nuts (33), the washers (34) and (36) and the bolts (37).
     (j) Remove the block assemblies (35).
     (k) Remove the nuts (43), the washers (42) and the bolts (40).
     (l) Remove the guide blocks (41).
     (m) Disconnect the unions (21) and (71) and remove the flexible hose (22).
     (n) Disconnect the unions (24) and (72) and remove the flexible hose (23).
     (o) Disconnect the unions (9) and (74) and remove the flexible hose (8).
     (p) Disconnect the unions (11) and (75) and remove the flexible hose (10).
     (q) Disconnect the union (30) and remove the flexible hose (29).
     (r) Disconnect the union (31) and remove the flexible hose (32).
     (s) Disconnect the union (59) and remove the flexible hose (66).
     (t) Disconnect the union (60) and remove the flexible hose (65).
   (3) To remove the rigid hydraulic pipes, do the steps that follow:
     (a) Remove and discard the lockwire from the band clamp nuts (91).
     (b) Loosen the band clamp nuts (91) sufficiently to remove the band clamps (92) from the line support blocks.
       1 Make sure that the mystic tape and the line support blocks stay in position when the band clamps (92) are removed.
     (c) Disconnect the unions (67) and (79) and remove the pipe (68).
     (d) Disconnect the unions (70) and (78) and remove the pipe (69).
     (e) Disconnect the union (77) and remove the nut (57) and the pipe (56).
     (f) Disconnect the union (80) and remove the nut (58) and the pipe (55).
     (g) Remove the nut (76) and disconnect the union (64). Remove the pipe (63).
     (h) Remove the nut (73) and disconnect the union (61). Remove the pipe (62).
Subtask 32-11-12-020-055-A
WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
  • FLUSH IT AWAY WITH CLEAN WATER
  • GET MEDICAL AID.
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.
CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.
B. Removal of the MLG Hydraulic Dressings (MLG with the One-Piece Hydraulic Transfer-Block Assembly)
F MLG Hydraulic Dressings (MLG with One-Piece Hydraulic Transfer-Block Assembly)
   (1) Install a PLUG - BLANKING immediately after you remove the applicable flexible hydraulic hoses and the rigid pipes.
   (2) To remove the flexible hydraulic hoses, do the steps that follow:
     (a) Remove and discard the lockwire from the unions (1), (13), (14) and (26).
     (b) Loosen the unions (1), (13), (14) and (26) to let the hydraulic fluid drain.
     (c) Remove the nuts (7), the washers (6), the bolts (3), the washers (4) and the line-support block assemblies (5).
     (d) Disconnect the unions (1) and (13).
     (e) Remove the flexible hoses (2) and (12).
     (f) Remove the nuts (18), the washers (19), the bolts (16), the washers (17) and the line-support block assemblies (20).
     (g) Disconnect the unions (14) and (26).
     (h) Remove the flexible hoses (15) and (25).
     (i) Remove the nuts (33), the washers (34) and (36) and the bolts (37).
     (j) Remove the block assemblies (35).
     (k) Remove the nuts (43), the washers (42) and the bolts (40).
     (l) Remove the guide blocks (41).
     (m) Disconnect the unions (21) and (71) and remove the flexible hose (22).
     (n) Disconnect the unions (24) and (72) and remove the flexible hose (23).
     (o) Disconnect the unions (9) and (74) and remove the flexible hose (8).
     (p) Disconnect the unions (11) and (75) and remove the flexible hose (10).
     (q) Disconnect the unions (30) and remove the flexible hose (29).
     (r) Disconnect the union (31) and remove the flexible hose (32).
     (s) Disconnect the union (59) and remove the flexible hose (66).
     (t) Disconnect the union (60) and remove the flexible hose (65).
   (3) To remove the rigid hydraulic pipes, do the steps that follow:
     (a) Remove and discard the lockwire from the band clamp nuts (91).
     (b) Loosen the band clamp nuts (91) sufficiently to remove the band clamps (92) from the line support blocks.
       1 Make sure that the mystic tape and the line support blocks stay in position when the band clamps (92) are removed.
     (c) Disconnect the unions (67) and (79) and remove the pipe (68).
     (d) Disconnect the unions (70) and (78) and remove the pipe (69).
     (e) Disconnect the union (77) and remove the nut (57) and the pipe (56).
     (f) Disconnect the union (80) and remove the nut (58) and the pipe (55).
     (g) Remove the nut (76) and disconnect the union (64). Remove the pipe (63).
     (h) Remove the nut (73) and disconnect the union (61). Remove the pipe (62).
[Rev.10 from 2021] 2026.04.01 00:40:02 UTC
"Aviabrain" 2025