Installation of the MLG Hydraulic Dressings

TASK 32-11-12-400-001-A
Installation 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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	AR	PLUG - BLANKING
No specific	AR	SAFETY BARRIER(S)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 2.5 and 2.25 m.N (22.12 and 19.91 lbf.in )
No specific	Torque wrench: range to between 4.5 and 4.0 m.N (39.82 and 35.40 lbf.in )
No specific	Torque wrench: range to between 27.3 and 24 m.N (20.13 and 17.70 lbf.ft )
No specific	Torque wrench: range to between 31 and 27 m.N (22.86 and 19.91 lbf.ft )
No specific	Torque wrench: range to between 32 and 29 m.N (23.60 and 21.39 lbf.ft )
No specific	Torque wrench: range to between 47.5 and 40.7 m.N (35.03 and 30.01 lbf.ft )
No specific	Torque wrench: range to between 59 and 54 m.N (43.51 and 39.82 lbf.ft )
No specific	Torque wrench: range to between 67.8 and 57 m.N (50.00 and 42.04 lbf.ft )
No specific	Torque wrench: range to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )
No specific	Torque wrench: range to between 2.73 and 2.4 m.daN (20.13 and 17.70 lbf.ft )
No specific	Torque wrench: range to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )
No specific	Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )
No specific	Torque wrench: range to between 4.75 and 4.07 m.daN (35.03 and 30.01 lbf.ft )
No specific	Torque wrench: range to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )
No specific	Torque wrench: range to between 6.78 and 5.7 m.daN (50.00 and 42.04 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.03JBA1)	Silicone base Grease-General Purpose - -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
(Material No.14SBA1)	Textile-Lint free Cotton -
No specific	mystic tape

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
731	L.H MAIN GEAR
741	R.H MAIN GEAR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
41	COTTER PIN	AIPC 32-11-12-03-065
19	COTTER PIN	AIPC 32-11-12-17-010
8	COTTER PIN	AIPC 32-11-12-17-010

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
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 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-10-00-863-001-A	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-002-A	Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-864-001-A	Depressurize the Green 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 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 29-23-00-860-002-A	Connection 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 32-00-00-860-002-A	Ground Configuration after Flight Configuration with Electrical Power
TASK 32-00-00-860-002-A-01	Ground Configuration after Flight Configuration without Electrical Power
TASK 32-11-11-400-001-A	Installation of the MLG Leg Assembly
TASK 32-42-00-710-001-A	Operational Check of the Normal Braking System
TASK 32-42-00-870-001-A	Bleeding of the Normal Braking at the Brake Units
TASK 32-42-27-400-001-A	Installation of the Brake
TASK 32-43-00-710-001-A	Operational Check of Alternate Braking System
TASK 32-43-00-870-002-A	Bleeding of the High Pressure Alternate Braking System
TASK 32-45-00-710-001-A	Operational Check of the Parking Brake System
TASK 32-46-00-740-001-A	BITE Test of the BSCU
MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL
MLG Hydraulic Dressings (MLG with One-Piece Hydraulic Transfer-Block Assembly)

3. Job Set-up
Subtask 32-11-12-941-052-A

A. Safety Precautions
(1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the ground safety locks are on the landing gear (Ref. AMM TASK 32-00-00-481-001).
(3) Make sure that you obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(4) On panel 400VU:

Make sure that the landing-gear control-lever 6GA is in the DOWN position
Make sure that a WARNING NOTICE(S) is in position to tell persons not to operate the landing gear.

(5) Make sure the WARNING NOTICES are in position to tell persons not to pressurize the Yellow and Green hydraulic systems.

Subtask 32-11-12-860-052-A

B. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position below the applicable zone 731(741).
(2) Make sure that the isolation coupling of the PTU is disconnected (Ref. AMM TASK 29-23-00-860-001).
(3) Make sure that the Green and the Yellow hydraulic systems are depressurized (Ref. AMM TASK 29-10-00-864-001), (Ref. AMM TASK 29-10-00-864-002).
(4) Make sure that the Green and the Yellow hydraulic system reservoirs are depressurized (Ref. AMM TASK 29-14-00-614-001).
(5) If you did not open the LGCIU circuit breakers, make sure that the electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).

Subtask 32-11-12-865-051-A

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
** ON A/C NOT FOR ALL
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/PARK BRK/CTL/STBY	71GG	N37
121VU	HYDRAULIC/PARK BRK/CTL/NORM	70GG	N36
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
** ON A/C NOT FOR ALL
121VU	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31

4. Procedure
Subtask 32-11-12-420-053-A

A. Preparation for Installation

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to clean:

the hydraulic dressings
the routings and the attached parts of the dressings
the dressing interfaces and the adjacent areas.

(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Make sure that the hydraulic line end-fittings and their interfaces are clean and in the correct condition.
(4) Examine the mystic tape, at the location of the band-clamps, for correct condition. If necessary, replace the mystic tape.

Subtask 32-11-12-420-051-G ** ON A/C NOT FOR ALL

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.

B. Installation of the MLG Hydraulic Dressings (MLG with the Four-Piece Hydraulic Transfer-Block Assembly)

MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL

(1) Remove the PLUG - BLANKING before you install the applicable rigid pipes and flexible hydraulic hoses.
(2) To install the rigid hydraulic pipes, do the steps that follow:
(a) Put the pipe (62) in position in the applicable line support blocks. Connect the union (61) and install the locknut (73).
(b) Put the pipe (63) in position in the applicable line support blocks. Connect the union (64) and install the locknut (76).
(c) Put the pipe (55) in position and connect the union (80). Install the locknut (58).
(d) Put the pipe (56) in position and connect the union (77). Install the locknut (57).
(e) TORQUE the locknuts (58) to between 31 and 27 m.N (22.86 and 19.91 lbf.ft )

.
(f) TORQUE the locknuts (73) and (76) to between 47.5 and 40.7 m.N (35.03 and 30.01 lbf.ft )

.
(g) TORQUE the locknut (57) to between 67.8 and 57 m.N (50.00 and 42.04 lbf.ft )

.
(h) Put the pipe (68) in position in the applicable line support blocks. Connect the unions (67) and (79).
(i) Put the pipe (69) in position in the applicable line support blocks. Connect the unions (70) and (78).
(j) TORQUE the unions (67) and (70) to between 27.3 and 24 m.N (20.13 and 17.70 lbf.ft )

.
(k) TORQUE the unions (78), (79) and (80) to between 32 and 29 m.N (23.60 and 21.39 lbf.ft )

.
(l) TORQUE the union (77) to between 59 and 54 m.N (43.51 and 39.82 lbf.ft )

.
(m) Put the band-clamps (92) in position and tighten the band-clamp nuts (91).
(n) Examine the routings of the rigid hydraulic pipes for correct installation. Make sure that the pipes do not touch the MLG leg or each other.
(o) Safety the band-clamp nuts (91) 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(p) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).
(3) To install the flexible hydraulic hoses, do the steps that follow:
(a) Make sure that you do not make kinks in the flexible hoses.
(b) Put the flexible hose (65) in position and connect the union (60).
(c) Put the flexible hose (66) in position and connect the union (59).
(d) Put the flexible hose (32) in position and connect the union (31).
(e) Put the flexible hose (29) in position and connect the union (30).
(f) Put the flexible hose (11) in position and connect the unions (12) and (75).
(g) Put the flexible hose (9) in position and connect the unions (10) and (74).
(h) TORQUE the unions (60), (31), (30), (12), (10), (74) and (75) to between 31 and 27 m.N (22.86 and 19.91 lbf.ft )

.
(i) TORQUE the union (59) to between 47.5 and 40.7 m.N (35.03 and 30.01 lbf.ft )

.
(j) Put the channels (38) in position on the flexible hoses (9) and (11).
(k) Install the channels (38) with the bolts (37), the washers (39) and the nuts (40).
(l) TORQUE the nuts (40) to between 4.5 and 4.0 m.N (39.82 and 35.40 lbf.in )

.
(m) Safety the nuts (40) with the new AIPC 32-11-12-03-065 COTTER PIN (41).
(n) Put the line support-block assembly (35) in position on the flexible hoses (9) and (11). Loosely install the bolts (36), the washers (34) and the nuts (33).
(o) Make sure that dimension Y is 150 MM (5.91 IN.).
(p) TORQUE the nuts (33) to between 4.5 and 4.0 m.N (39.82 and 35.40 lbf.in )

.
(q) Put the flexible hose (24) in position and connect the unions (23) and (71).
(r) Put the flexible hose (25) in position and connect the unions (26) and (72).
(s) TORQUE the unions (26), (72), (23) and (71) to between 31 and 27 m.N (22.86 and 19.91 lbf.ft )

.
(t) Put the channels (38) in position on the flexible hoses (24) and (25).
(u) Install the channels (38) with the bolts (37), the washers (39) and the nuts (40).
(v) TORQUE the nuts (40) to between 4.5 and 4.0 m.N (39.82 and 35.40 lbf.in )

.
(w) Safety the nuts (40) with the new AIPC 32-11-12-03-065 COTTER PIN (41).
(x) Put the line support-block assembly (35) in position on the flexible hoses (24) and (25). Loosely install the bolts (36), the washers (34) and the nuts (33).
(y) Make sure that dimension Z is 280 MM (11.02 IN.).
(z) TORQUE the nuts (33) to between 4.5 and 4.0 m.N (39.82 and 35.40 lbf.in )

.
(aa) Put the flexible hoses (16) and (27) in position and connect the unions (15) and (28).
(ab) TORQUE the unions (15) and (28) to between 31 and 27 m.N (22.86 and 19.91 lbf.ft )

.
(ac) If necessary, safety the unions (15) and (28) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(ad) Put the line support-block assemblies (22) in position on the flexible hoses (16), (24), (25) and (27). Loosely install the bolts (17), the washers (18) and (21), and the nuts (20).
(ae) Make sure that dimension X is between 90 MM (3.54 IN.) and 95 MM (3.74 IN.).

MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL

(af) TORQUE the nuts (20) to between 2.5 and 2.25 m.N (22.12 and 19.91 lbf.in )

.
(ag) If bolts (17) have the cotter pin holes, safety them with the new AIPC 32-11-12-17-010 COTTER PIN (19).
(ah) Put the flexible hoses (2) and (13) in position and connect the unions (1) and (14).
(ai) TORQUE the unions (1) and (14) to between 31 and 27 m.N (22.86 and 19.91 lbf.ft )

.
(aj) If necessary, safety the unions (1) and (14) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(ak) Put the line support block assemblies (5) in position on the flexible hoses (2), (9), (11) and (13). Loosely install the bolts (3), the washers (4) and (6), and the nuts (7).
(al) Make sure that dimension X is between 90 MM (3.54 IN.) and 95 MM (3.74 IN.).
(am) TORQUE the nuts (7) to between 2.5 and 2.25 m.N (22.12 and 19.91 lbf.in )

.
(an) If bolts (3) have the cotter pin holes, safety them with the new AIPC 32-11-12-17-010 COTTER PIN (8).
(ao) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 32-11-12-420-051-J ** ON A/C NOT FOR ALL

B. Installation of the MLG Hydraulic Dressings (MLG with the Four-Piece Hydraulic Transfer-Block Assembly)

MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL

(1) Remove the PLUG - BLANKING immediately before you install the applicable rigid pipes and the flexible hydraulic hoses.
(2) To install the rigid hydraulic pipes, do the steps that follow:
(a) Lubricate the threads of the items that follow with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) :

The nuts (57), (58), (73) and (76)
The pipes (55), (56), (62) and (63)
The unions (61), (64), (77) and (80).

(b) Apply Silicone base Grease-General Purpose - - (Material No.03JBA1) to the surfaces of the line support blocks.
(c) Put the pipe (62) in position in the applicable line support blocks. Connect the union (61) and install the nut (73).
(d) Put the pipe (63) in position in the applicable line support blocks. Connect the union (64) and install the nut (76).
(e) Put the pipe (55) in position and connect the union (80). Install the nut (58).
(f) Put the pipe (56) in position and connect the union (77). Install the nut (57).
(g) TORQUE the nuts (73) and (76) to between 4.75 and 4.07 m.daN (35.03 and 30.01 lbf.ft )

.
(h) TORQUE the nut (57) to between 6.78 and 5.7 m.daN (50.00 and 42.04 lbf.ft )

.
(i) TORQUE the nut (58) to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )

.
(j) Put the pipe (68) in position in the applicable line support blocks. Connect the unions (67) and (79).
(k) Put the pipe (69) in position in the applicable line support blocks. Connect the unions (70) and (78).
(l) TORQUE the unions (67) and (70) to between 2.73 and 2.4 m.daN (20.13 and 17.70 lbf.ft )

.
(m) TORQUE the unions (78), (79) and (80) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(n) TORQUE the union (77) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

.
(o) Put the band clamps (92) in position and tighten the band clamp nuts (91).
(p) Examine the routings of the rigid hydraulic pipes for correct installation. Make sure that the pipes do not touch the MLG leg or each other.
(q) Safety the band clamp nuts (91) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(r) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).
(3) To install the flexible hydraulic hoses, do the steps that follow:
(a) Make sure that you do not make kinks in the flexible hoses.
(b) Lubricate the threads of the items that follow with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1)

The unions (9), (11), (30), (31), (59), (60), (74) and (75).

(c) Put the flexible hose (65) in position and connect the union (60).
(d) Put the flexible hose (66) in position and connect the union (59).
(e) Put the flexible hose (32) in position and connect the union (31).
(f) Put the flexible hose (29) in position and connect the union (30).
(g) Put the flexible hose (10) in position and connect the unions (11) and (75).
(h) Put the flexible hose (8) in position and connect the unions (9) and (74).
(i) TORQUE the union (60), (30), (31), (9), (11), (74) and (75) to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )

.
(j) TORQUE the union (59) to between 4.75 and 4.07 m.daN (35.03 and 30.01 lbf.ft )

.
(k) Put the guide blocks (38) in position on the flexible hoses (8) and (10).
(l) Install the guide blocks (38) with the bolts (37), the washers (39) and the nuts (40).
(m) TORQUE the nuts (40) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(n) Put the line-support block assembly (35) in position on the flexible hoses (8) and (10). Loosely install the bolts (36), the washers (34) and the nuts (33).
(o) Make sure that dimension Y is 150 mm (5.91 in.).
(p) TORQUE the nuts (33) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(q) Put the flexible hose (22) in position and connect the unions (21) and (71).
(r) Put the flexible hose (23) in position and connect the unions (24) and (72).
(s) TORQUE the unions (21), (24), (71) and (72) to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )

.
(t) Put the guide blocks (38) in position on the flexible hoses (22) and (23).
(u) Install guide blocks (38) with the bolts (37), the washers (39) and the nuts (40).
(v) TORQUE the nuts (40) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(w) Put the line-support block assembly (35) in position on the flexible hoses (22) and (23). Loosely install the bolts (36), the washers (34) and the nuts (33).
(x) Make sure that dimension Z is 280 mm (11.02 in.).
(y) TORQUE the nuts (33) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(z) Put the flexible hoses (15) and (25) in position and connect the unions (14) and (26).
(aa) TORQUE the unions (14) and (26) to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )

.
(ab) Safety the unions (14) and (26) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(ac) Put the line-support block assemblies (20) in position on the flexible hoses (15), (22), (23) and (25). Loosely install the bolts (16), the washers (17) and (19), and the nuts (18).
(ad) Make sure that dimension X is between 100 mm (3.94 in.) and 105 mm (4.13 in.).
(ae) TORQUE the nuts (18) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(af) Put the flexible hoses (2) and (12) in position and connect the unions (1) and (13).
(ag) TORQUE the unions (1) and (13) to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )

.
(ah) Safety the unions (1) and (13) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(ai) Put the line-support block assemblies (5) in position on the flexible hoses (2), (8), (10) and (12). Loosely install the bolts (3), the washers (4) and (6), and the nuts (7).
(aj) Make sure that dimension X is between 100 mm (3.94 in.) and 105 mm (4.13 in.).
(ak) TORQUE the nuts (7) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(al) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 32-11-12-420-051-K ** ON A/C NOT FOR ALL

B. Installation of the MLG Hydraulic Dressings (MLG with the Four-Piece Hydraulic Transfer-Block Assembly)

MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL

The nuts (57), (58), (73) and (76)
The pipes (55), (56), (62) and (63)
The unions (61), (64), (77) and (80).

.
(h) TORQUE the nut (57) to between 6.78 and 5.7 m.daN (50.00 and 42.04 lbf.ft )

.
(i) TORQUE the nut (58) to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )

.
(m) TORQUE the unions (78), (79) and (80) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(n) TORQUE the union (77) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

.
(o) Put the band clamps (92) in position and tighten the band clamp nuts (91).
(p) Examine the routings of the rigid hydraulic pipes for correct installation. Make sure that the pipes do not touch the MLG leg or each other.
(q) Safety the band clamp nuts (91) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(r) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).
(3) To install the flexible hydraulic hoses, do the steps that follow:
(a) Make sure that you do not make kinks in the flexible hoses.
(b) Lubricate the threads of the items with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) :

The unions (9), (11), (30), (31), (59), (60), (74) and (75).

(c) Put the flexible hose (65) in position and connect the union (60).
(d) Put the flexible hose (66) in position and connect the union (59).
(e) Put the flexible hose (32) in position and connect the union (31).
(f) Put the flexible hose (29) in position and connect the union (30).
(g) Put the flexible hose (10) in position and connect the unions (11) and (75).
(h) Put the flexible hose (8) in position and connect the unions (9) and (74).
(i) TORQUE the unions (60), (30), (31), (9), (11), (74) and (75) to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )

.
(j) TORQUE the union (59) to between 4.75 and 4.07 m.daN (35.03 and 30.01 lbf.ft )

.
(k) Put the guide blocks (41) in position on the flexible hoses (8) and (10).
(l) Install the guide blocks (41) with the bolts (40), the washers (42) and the nuts (43).
(m) TORQUE the nuts (43) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(n) Put the line-support block assembly (35) in position on the flexible hoses (8) and (10).
(o) Loosely install the bolts (37), the washers (36) and (34) and the nuts (33).
(p) Make sure that dimension Y is 150 mm (5.91 in.).
(q) TORQUE the nuts (33) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(r) Put the flexible hose (22) in position and connect the unions (21) and (71).
(s) Put the flexible hose (23) in position and connect the unions (24) and (72).
(t) TORQUE the unions (21), (24), (71) and (72) to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )

.
(u) Put the guide blocks (41) in position on the flexible hoses (22) and (23).
(v) Install the guide blocks (41) with the bolts (40), the washers (42) and the nuts (43).
(w) TORQUE the nuts (43) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(x) Put the line-support block assembly (35) in position on the flexible hoses (22) and (23).
(y) Loosely install the bolts (37), the washers (36) and (34) and the nuts (33).
(z) Make sure that dimension Z is 280 mm (11.02 in.).
(aa) TORQUE the nuts (33) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(ab) Put the flexible hoses (15) and (25) in position and connect the unions (14) and (26).
(ac) TORQUE the unions (14) and (26) to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )

.
(ad) Safety the unions (14) and (26) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(ae) Put the line-support block assemblies (20) in position on the flexible hoses (15), (22), (23) and (25).
(af) Loosely install the bolts (16), the washers (17) and (19), and the nuts (18).
(ag) Make sure that dimension X is between 100 mm (3.94 in.) and 105 mm (4.13 in.).
(ah) TORQUE the nuts (18) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(ai) Put the flexible hoses (2) and (12) in position and connect the unions (1) and (13).
(aj) TORQUE the unions (1) and (13) to between 3.1 and 2.7 m.daN (22.86 and 19.91 lbf.ft )

.
(ak) Safety the unions (1) and (13) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(al) Put the line-support block assemblies (5) in position on the flexible hoses (2), (8), (10) and (12).
(am) Loosely install the bolts (3), the washers (4) and (6), and the nuts (7).
(an) Make sure that dimension X is between 100 mm (3.94 in.) and 105 mm (4.13 in.).
(ao) TORQUE the nuts (7) to between 0.45 and 0.4 m.daN (39.82 and 35.40 lbf.in )

.
(ap) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 32-11-12-420-059-A

C. Installation of the MLG Hydraulic Dressings (MLG with the One-Piece Hydraulic Transfer-Block Assembly)

MLG Hydraulic Dressings (MLG with One-Piece Hydraulic Transfer-Block Assembly)

The nuts (57), (58), (73) and (76)
The pipes (55), (56), (62) and (63)
The unions (61), (64), (77) and (80).

.
(h) TORQUE the nut (57) to between 67.8 and 57 m.N (50.00 and 42.03 lbf.ft )

.
(i) TORQUE the nut (58) to between 31 and 27 m.N (22.86 and 19.91 lbf.ft )

.
(m) TORQUE the unions (78), (79) and (80) to between 32 and 29 m.N (23.60 and 21.39 lbf.ft )

.
(n) TORQUE the union (77) to between 59 and 54 m.N (43.51 and 39.82 lbf.ft )

.
(o) Put the band clamps (92) in position and tighten the band clamp nuts (91).
(p) Examine the routings of the rigid hydraulic pipes for correct installation. Make sure that the pipes do not touch the MLG leg or each other.
(q) Safety the band clamp nuts (91) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(r) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).
(3) To install the flexible hydraulic hoses, do the steps that follow:
(a) Make sure that you do not make kinks in the flexible hoses.
(b) Lubricate the threads of the items with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) :

The unions (9), (11), (30), (31), (59), (60), (74) and (75).

(c) Put the flexible hose (65) in position and connect the union (60).
(d) Put the flexible hose (66) in position and connect the union (59).
(e) Put the flexible hose (32) in position and connect the union (31).
(f) Put the flexible hose (29) in position and connect the union (30).
(g) Put the flexible hose (10) in position and connect the unions (11) and (75).
(h) Put the flexible hose (8) in position and connect the unions (9) and (74).
(i) TORQUE the unions (60), (30), (31), (9), (11), (74) and (75) to between 31 and 27 m.N (22.86 and 19.91 lbf.ft )

.
(j) TORQUE the union (59) to between 47.5 and 40.7 m.N (35.03 and 30.01 lbf.ft )

.
(ab) Put the flexible hoses (15) and (25) in position and connect the unions (14) and (26).
(ac) TORQUE the unions (14) and (26) to between 31 and 27 m.N (22.86 and 19.91 lbf.ft )

.
(ai) Put the flexible hoses (2) and (12) in position and connect the unions (1) and (13).
(aj) TORQUE the unions (1) and (13) to between 31 and 27 m.N (22.86 and 19.91 lbf.ft )

.
(ap) Identify the tightened union nuts with a red line
(Ref. AMM TASK 20-23-22-910-001).

Subtask 32-11-12-410-050-E

D. Close Access

MLG Hydraulic Dressings (MLG with Four-Piece Hydraulic Transfer-Block Assembly) ** ON A/C NOT FOR ALL

MLG Hydraulic Dressings (MLG with One-Piece Hydraulic Transfer-Block Assembly)

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) Remove the PLUG-BLANKING from each disconnected line end.
(2) Connect the applicable hydraulic hoses at the MLG/wheel brake interface (Ref. AMM TASK 32-42-27-400-001).
(3) Connect the hydraulic hoses (29), (32), (65) and (66) at the MLG/airframe interface (Ref. AMM TASK 32-11-11-400-001).
(4) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).

Subtask 32-11-12-865-052-A

E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
** ON A/C NOT FOR ALL
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32
** ON A/C ALL
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/PARK BRK/CTL/STBY	71GG	N37
121VU	HYDRAULIC/PARK BRK/CTL/NORM	70GG	N36
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
** ON A/C NOT FOR ALL
121VU	LGCIU/BAT SPLY/SYS2	59GA	R32
121VU	LGCIU/BAT SPLY/SYS1	58GA	R31

Subtask 32-11-12-869-057-A

F. Aircraft Configuration
(1) If you did not de-energize the aircraft electrical circuits, put the aircraft back to the ground configuration (Ref. AMM TASK 32-00-00-860-002).

Subtask 32-11-12-863-050-A

G. Pressurize the Hydraulic Systems

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.

(1) Pressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-863-001).
(2) Pressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-863-002).
(3) Pressurize the Green and Yellow hydraulic reservoirs (Ref. AMM TASK 29-14-00-614-002).

Subtask 32-11-12-870-050-A

H. Bleed the Braking Systems
(1) Bleed the Normal braking system (Ref. AMM TASK 32-42-00-870-001).
(2) Bleed the Alternate braking system (Ref. AMM TASK 32-43-00-870-002).

Subtask 32-11-12-710-050-A

I. Test
(1) Do an operational test of the Normal Braking System (Ref. AMM TASK 32-42-00-710-001).
(2) Do an operational test of the Alternate Braking System with and/or without Anti-Skid (Ref. AMM TASK 32-43-00-710-001).
(3) Do an operational test of the Parking/Ultimate Emergency Braking (Ref. AMM TASK 32-45-00-710-001).

Subtask 32-11-12-110-052-A

J. Clean the Dressings

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) to remove unwanted hydraulic fluid.

Subtask 32-11-12-790-050-A

K. Check the Hydraulic Dressings for Leaks
(1) Examine the flexible hoses, the rigid hydraulic pipes and their connections for leaks. Leaks are not permitted.

Subtask 32-11-12-740-050-A

L. Test
(1) Do a BITE test of the Brakes and Steering (Ref. AMM TASK 32-46-00-740-001).

5. Close-up
Subtask 32-11-12-864-050-A

A. Depressurize the Hydraulic Systems
(1) Depressurize the Green hydraulic system
(Ref. AMM TASK 29-10-00-864-001).
(2) Depressurize the Yellow hydraulic system
(Ref. AMM TASK 29-10-00-864-002).

Subtask 32-11-12-942-050-A

B. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the SAFETY BARRIER(S).
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 04:07:01 UTC