Installation of the Pressure/Suction/Case Drain/Return Piping of the Green Hydraulic System in the Engine Pylon

TASK 29-11-49-400-013-A
Installation of the Pressure/Suction/Case Drain/Return Piping of the Green Hydraulic System in the Engine Pylon

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

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.

CAUTION: DO NOT LET HYDRAULIC FLUID FALL ON THE ENGINE. UNWANTED HYDRAULIC FLUID MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FLUID CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL LOOSEN OR TIGHTEN THE UNION TOO MUCH.

1. Reason for the Job
The installation of the pressure/suction/case drain/return piping of the Yellow hydraulic system is given in the task 29-13-49-400-01300.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	1	RULER - GRADUATED
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 27.7 and 24.3 m.N (20.43 and 17.92 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 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )
No specific	Torque wrench: range to between 9.5 and 8.5 m.daN (70.06 and 62.68 lbf.ft )
No specific	Torque wrench: range to between 13 and 12 m.daN (95.87 and 88.50 lbf.ft )
No specific	Torque wrench: range to between 18.1 and 15.8 m.daN (133.48 and 116.52 lbf.ft )
98D54003021000	1	SPECIAL WRENCH

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06CMD9)	Silicone Adhesive Sealant-General Purpose One part legacy

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB
FOR [1000EM1] (ENGINE-1)
413AL, 413AR, 413CL, 413CR, 413DT, 437AL, 471AL, 471AR, 471BL, 471BR, 471CL, 471CR, 471DL, 475AL, 475BL

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-14-910-001-A	Protection of Hydraulic Lines from Vibration and Chafing
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 26-21-41-000-001-A	Removal of the Engine Fire-Extinguisher Bottle
TASK 26-21-41-400-001-A	Installation of the Engine Fire-Extinguisher Bottle
TASK 26-21-49-000-001-A	Removal of the Engine Fire-Extinguishing Pipe
TASK 26-21-49-400-001-A	Installation of the Engine Fire-Extinguishing Pipe
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-11-00-710-001-A	Operational Test of the Green Hydraulic System
TASK 29-11-39-400-802-A	Installation of the Self Sealing Half-Coupling of the Green Pump Suction (1700GM)
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 36-11-42-000-001-A	Removal of the Bleed-Air Precooler Exchanger
TASK 36-11-42-400-001-A	Installation of the Bleed-Air Precooler Exchanger
TASK 54-54-00-000-001-A	Removal of the Aft Fixed Fairing
TASK 54-54-00-000-001-A-01	Removal of the Aft Fixed Fairing
TASK 54-54-00-400-001-A	Installation of the Aft Fixed Fairing
TASK 54-54-00-400-001-A-01	Installation of the Aft Fixed Fairing
TASK 54-55-00-000-001-A	Removal of the Aft Movable Fairing
TASK 54-55-00-400-001-A	Installation of the Aft Movable Fairing
TASK 54-56-00-000-002-A	Removal of the Lower Fairing
TASK 54-56-00-400-002-A	Installation of the Lower Fairing
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
Aft Pressure/Suction/Case Drain/Return Piping of the Green Hydraulic System in the Engine Pylon
Forward Pressure/Suction/Case Drain/Return Piping of the Green Hydraulic System in the Engine Pylon
Middle Pressure/Suction/Case Drain/Return Piping of the Green Hydraulic System in the Engine Pylon

3. Job Set-up
Subtask 29-11-49-860-100-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(2) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(3) Make sure that the Green hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-001).
(4) Make sure that the reservoir of the Green hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
(5) On AIR COND panel 30VU:

Make sure that the APU BLEED pushbutton switch is released (ON legend off).
Make sure that a WARNING NOTICE(S) is in position to tell persons not to operate this pushbutton switch.

(6) Make sure that WARNING NOTICE(S) are in position to tell persons not to pressurize the Green hydraulic system:

On the HYD section of overhead panel 40VU
On the ground service panel 198CB.

(7) Make sure that a WARNING NOTICE(S) is in position on access door 195BB to tell persons not to pressurize the Green hydraulic reservoir.
(8) On the center pedestal, on ENG panel 115VU:

Make sure that the ENG/MODE selector switch is in the NORM position.
Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
Make sure that WARNING NOTICE(S) is in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.

(9) On the ENG section of maintenance panel 50VU:

Make sure that the ON legend of the ENG FADEC GND PWR/1(2) pushbutton switch is off.
Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).

Subtask 29-11-49-865-074-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-11-49-010-087-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the left fan cowl is open (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL.
(2) Make sure that an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE s in position at the zones 410 and 470.
(3) Make sure that a CONTAINER 5 L (1.32 USGAL) is in position below the hydraulic lines.
(4) Make sure that these access panels are removed:
(a) FOR [1000EM1] (ENGINE-1)
413DT 413AL 413CL 471AL 471AR 413CR 413AR 471BR 471CR 471DL 471CL 471BL 475AL 475BL.

Subtask 29-11-49-040-051-A ** ON A/C NOT FOR ALL

D. Make the thrust reverser unserviceable for maintenance (Ref. AMM TASK 78-30-00-040-012).

Subtask 29-11-49-020-081-A ** ON A/C NOT FOR ALL

E. Removal of Components
(1) Removal of the fairings.
(a) Make sure that the aft movable fairing is removed (Ref. AMM TASK 54-55-00-000-001).
(b) Make sure that the lower fairing is removed (Ref. AMM TASK 54-56-00-000-002).
(c) Make sure that the aft fixed fairing is removed (Ref. AMM TASK 54-54-00-000-001).
(2) Make sure that the fire extinguisher bottles are removed (Ref. AMM TASK 26-21-41-000-001).
(3) Make sure that the engine fire-extinguishing pipe is removed (Ref. AMM TASK 26-21-49-000-001).
(4) Make sure that the bleed-air precooler exchangers are removed (Ref. AMM TASK 36-11-42-000-001).

4. Procedure
Subtask 29-11-49-420-087-A ** ON A/C NOT FOR ALL

A. Installation of the Aft Pressure/Suction/Case Drain/Return Piping

Aft Pressure/Suction/Case Drain/Return Piping of the Green Hydraulic System in the Engine Pylon ** ON A/C NOT FOR ALL

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking plugs from the line ends.
(4) Make sure that the hydraulic line end-fittings are serviceable.
(5) Put the pump delivery hose (1) in position in the engine pylon.
(6) Connect the pump delivery hose (1) to the wing pipe (13) and the middle pipe (5).
(7) TORQUE the pump delivery hose (1) to between 9.5 and 8.5 m.daN (70.06 and 62.68 lbf.ft )

.
(8) Put the pump suction hose (2) in position in the engine pylon.
(9) Connect the pump suction hose (2) to the wing pipe (12) and the middle pipe (6).
(10) TORQUE the pump suction hose (2) to between 9.5 and 8.5 m.daN (70.06 and 62.68 lbf.ft )

.
(11) Adjustment of the suction and delivery hoses in the pylon:
(a) With a RULER - GRADUATED, measure the distances between the suction and delivery hoses and the aft fixed-pylon-fairing RIB13.

Aft Pressure/Suction/Case Drain/Return Piping of the Green Hydraulic System in the Engine Pylon ** ON A/C NOT FOR ALL

(b) Make sure that the suction and delivery hoses are at an equal distance from the aft fixed-pylon-fairing RIB13.
(c) Do the protection from vibration and chafing, if necessary (Ref. AMM TASK 20-23-14-910-001).
(12) Put the thrust reverser hydraulic control unit return hose (3) in position in the engine pylon.
(13) Connect the thrust reverser hydraulic control unit return hose (3) to the wing pipe (14) and the middle pipe (7).
(14) TORQUE the thrust reverser hydraulic control unit return hose (3) to the wing pipe (14) to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

.
(15) TORQUE the thrust reverser hydraulic control unit return hose (3) to the middle pipe (7) to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

.
(16) Put the pump case drain hose (4) in position in the engine pylon.
(17) Connect the pump case drain hose (4) to the wing pipe (11) and the middle pipe (8).
(18) TORQUE the pump case drain hose (4) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(19) Install the bolt (10).
(20) Install the nut (9) and tighten it.

Subtask 29-11-49-420-081-C ** ON A/C NOT FOR ALL

B. Installation of the Forward Pressure/Suction/Case Drain/Return Piping

Forward Pressure/Suction/Case Drain/Return Piping of the Green Hydraulic System in the Engine Pylon ** ON A/C NOT FOR ALL

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking plugs from the line ends.
(4) Make sure that the hydraulic line end-fittings are serviceable.
(5) Installation of the forward pressure/suction/case drain/return piping:

Put the return pipe (2) in position in the engine pylon.
Put the case drain pipe (3) in position in the engine pylon.
Put the pressure pipe (4) in position in the engine pylon.
Put the suction pipe (5) in position in the engine pylon.

(6) Connection of the forward pressure/case drain/return piping:

Connect the case drain pipe (3) to the pipe (18).
Connect the pressure pipe (4) to the pipe (19).
Connect the return pipe (2) to the manual control valve (20).

(7) Connection of the forward pressure/suction/case drain piping at the fluid disconnect panel:

Connect the case drain pipe (3) to the hose (13).
TORQUE the coupling nut of the hose (13) to between 27.7 and 24.3 m.N (20.43 and 17.92 lbf.ft ) .
Install the washers (9), the bolts (8) and tighten.
Connect the pressure pipe (4) to the quick-release coupling (14).
TORQUE the nut of the quick-release coupling (14) to between 13 and 12 m.daN (95.87 and 88.50 lbf.ft ) .
Install the washers (7) and the bolts (6).
Install the spacer (12), the washer (11) and the bolt (10).
Tighten the bolts (6) and (10).
Connect the suction pipe (5) to the fluid disconnect panel.
Install the washers (17), the bolts (16) and tighten.
Install the self sealing half-coupling (15) (Ref. AMM TASK 29-11-39-400-802).

(8) Installation of the pipe clamp blocks:
(a) Installation of the half clamp block (22) (detail B):

Install the half clamp block (22).
Seal the half clamp block (22) with Silicone Adhesive Sealant-General Purpose One part legacy (Material No.06CMD9) .
Install the bolts (23), the washers (21) and tighten.

(b) Installation of the clamp blocks (26), (27) and (28) (detail C):

Install the bushings (24).
Install the clamp blocks (26), (27) and (28) on the longitudinal bulkhead (30).
Install the nuts (29), the bolts (25) and tighten.

Install the bushings (31).
Install the clamp blocks (35), (36) and (37) on the bracket (39).
Install the nuts (38), the bushing (32), the bolts (33) and (34) and tighten.

Subtask 29-11-49-420-082-A ** ON A/C NOT FOR ALL

C. Installation of the Middle Pressure/Suction/Case Drain/Return Piping

Middle Pressure/Suction/Case Drain/Return Piping of the Green Hydraulic System in the Engine Pylon ** ON A/C NOT FOR ALL

Put the return pipe (4) in position in the engine pylon.
Put the case drain pipe (3) in position in the engine pylon.
Put the pressure pipe (2) in position in the engine pylon.
Put the suction pipe (1) in position in the engine pylon.

(6) Connection of the middle pressure/suction/case drain/return piping at the upper front spar:

Use the 98D54003021000 SPECIAL WRENCH to connect the suction pipe (1) to the suction pipe (9).
Connect the pressure pipe (2) to the pressure pipe (8).
Connect the case drain pipe (3) to the case drain pipe (7).
Connect the return pipe (4) to the return pipe (6).
Install the bolts (10), the washers (11), the nuts (5) and tighten.
Apply Silicone Adhesive Sealant-General Purpose One part legacy (Material No.06CMD9) to the bolts (10) and the nuts (5).

(7) Installation of the pipe clamp blocks:
(a) Installation of the clamp blocks (37), (38) and (39) (detail F):

Install the bushings (34).
Install the clamp block (37) on the bracket (35).
Install the clamp blocks (38) and (39).
Install the bracket (33).
Install the bolts (42), the washers (43), the nuts (36) and tighten.
Install the bolts (40), the washers (41) and tighten.

(b) Installation of the clamp blocks (detail E):

Install the bushings (44) and (49).
Install the plate (51) and the clamp block (52).
Install the clamp blocks (53) and (54).
Install the clamp block (47) on the bracket (48).
Install the clamp blocks (46) and (45).
Install the spacers (55) and (61).
Install the cover (58).
Install the bolts (59) and the washers (60).
Install the bolts (57), the washers (56) and the nuts (50).
Tighten the bolts (59) and the nuts (50).

Install the bushings (32).
Install the clamp block (27) on the bracket (26).
Install the clamp blocks (28) and (29).
Install the washers (30), the bolts (31) and tighten.

(d) Installation of the half clamp blocks (22) and (23) (detail C):

Install the bushings (18).
Install the half clamp blocks (22) and (23) on the RIB 10.
Install the bolts (17) and the nuts (19).
Install the brackets (20).
Install the bolts (16) and the nuts (21) on the brackets (20).
Install the bolts (24) and the washers (25).
Tighten the nuts (19) and (21) and the bolts (24).

(8) Connection of the middle pressure/suction/case drain/return piping:

Connect the return pipe (4) to the hose (13).
Connect the case drain pipe (3) to the pipe (12).
Connect the pressure pipe (2) to the hose (15).
Connect the suction pipe (1) to the hose (14).

(9) At the upper front spar:

TORQUE the coupling nut of the return pipe (6) to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft ) .
TORQUE the coupling nut of the case drain pipe (7) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft ) .
TORQUE the coupling nut of the pressure pipe (8) to between 9.5 and 8.5 m.daN (70.06 and 62.68 lbf.ft ) .
TORQUE the coupling nut of the suction pipe (9) to between 18.1 and 15.8 m.daN (133.48 and 116.52 lbf.ft ) .

(10) Remove the container.

Subtask 29-11-49-440-050-A ** ON A/C NOT FOR ALL

D. Make sure that the thrust reverser is serviceable after maintenance (Ref. AMM TASK 78-30-00-440-012).

Subtask 29-11-49-420-083-A ** ON A/C NOT FOR ALL

E. Installation of Components
(1) Install the bleed-air precooler exchangers (Ref. AMM TASK 36-11-42-400-001).
(2) Install the engine fire-extinguishing pipe (Ref. AMM TASK 26-21-49-400-001).
(3) Install the fire extinguisher bottles (Ref. AMM TASK 26-21-41-400-001).
(4) Installation of the fairings.
(a) Install the aft movable fairing (Ref. AMM TASK 54-55-00-400-001).
(b) Install the lower fairing (Ref. AMM TASK 54-56-00-400-002).
(c) Install the aft fixed fairing (Ref. AMM TASK 54-54-00-400-001).

Subtask 29-11-49-410-070-B ** ON A/C NOT FOR ALL

F. Installation of the Pylon Access Panels
(1) Install these access panels:
(a) FOR [1000EM1] (ENGINE-1)
413DT 413AL 413CL 471AL 471AR 413CR 413AR 471BR 471CR 471DL 471CL 471BL 475AL 475BL.

Subtask 29-11-49-865-075-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-11-49-710-065-A ** ON A/C NOT FOR ALL

H. Do the operational test of the Green hydraulic system (Ref. AMM TASK 29-11-00-710-001).

5. Close-up
Subtask 29-11-49-410-071-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Close the left fan cowl (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL.
(2) Remove the access platform(s).

Subtask 29-11-49-942-068-A ** ON A/C NOT FOR ALL

B. Remove the Safety Precautions
(1) Remove the WARNING NOTICE(S).
(2) Make sure that the work area is clean and clear of tools and other items.

Subtask 29-11-49-862-050-A ** ON A/C NOT FOR ALL

C. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.01 12:50:25 UTC