Installation of the Yellow HCU Pipe

TASK 29-13-49-400-048-A
Installation of the Yellow HCU Pipe

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
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 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 4.57 and 4.47 m.daN (33.70 and 32.96 lbf.ft )
No specific	Torque wrench: range to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB
FOR [1000EM2] (ENGINE-2)
423AL, 447AL, 448AR, 461AL, 462AR

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
18	NUT	AIPC 29-13-06-02-230
19	NUT	AIPC 29-13-06-02-230
1	NUTS	AIPC 54-57-17-04-020

D. Referenced Information

REFERENCE	DESIGNATION
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 26-21-49-000-002-A	Removal of the Engine Fire-Extinguishing Pipe
TASK 26-21-49-400-002-A	Installation of the Engine Fire-Extinguishing Pipe
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-13-00-710-002-A	Operational Test of the Yellow Hydraulic System
TASK 29-13-49-000-045-A	Removal of the Engine 2 Thrust-Reverser Hydraulic Supply Hoses
TASK 29-13-49-400-045-A	Installation of the Engine 2 Thrust-Reverser Hydraulic Supply Hoses
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 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 71-13-11-000-040-A	Removal of the Fan Cowl Doors
TASK 71-13-11-400-040-A	Installation of the Fan Cowl Doors
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-31-00-710-040-A	Operational Test of the Thrust Reverser System
TASK 78-31-00-710-040-A-01	Operational Test of the Thrust Reverser without CFDS - Engine not Running
TASK 78-31-00-710-040-A-02	Operational Test of the Thrust Reverser without CFDS - Engine Running
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
TASK 78-37-51-000-003-A	Removal of the Thrust Reverser Hydraulic Filter Assembly
TASK 78-37-51-400-003-A	Installation of the Thrust Reverser Hydraulic Filter Assembly
Support Plate
HCU Pipe ** ON A/C NOT FOR ALL
HCU Pipe ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 29-13-49-860-105-B ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the engine 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 Yellow hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-002).
(4) Make sure that the reservoir of the Yellow 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 (the 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 a WARNING NOTICE(S) is in position to tell persons not to pressurize the Yellow 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 Yellow 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 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 2 control switch.

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

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

Subtask 29-13-49-865-091-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
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-13-49-010-096-B ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that this access panel is removed:
(a) FOR [1000EM2] (ENGINE-2)
423AL.
(2) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(3) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM2] (ENGINE-2)
461AL 462AR.
(4) Make sure that an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE is in position at the zone 420.
(5) Make sure that a CONTAINER 5 L (1.32 USGAL) is in position below the hydraulic lines.

Subtask 29-13-49-040-063-B ** ON A/C NOT FOR ALL

D. Deactivation of the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 29-13-49-020-104-B ** ON A/C NOT FOR ALL

E. Maintenance Configuration for the Access to the Yellow HCU Pipe
(1) Make sure that the left fan-cowl door is removed (Ref. AMM TASK 71-13-11-000-040).
(2) Make sure that the thrust-reverser hydraulic-supply hoses are disconnected (Ref. AMM TASK 29-13-49-000-045).
(a) Make sure that the four hoses are disconnected from the left interface bracket.
(b) Make sure that the hose is disconnected from the pylon tube at the left bracket.
(c) Make sure that the clamps that hold the five disconnected hoses are released.
(d) Make sure that the hoses are pushed into the pylon.
(3) Make sure that the left and the right support plates are released.

Support Plate ** ON A/C NOT FOR ALL

(4) Make sure that the FWD end of the engine fire-extinguishing pipe is disconnected and is on the fan case (Ref. AMM TASK 26-21-49-000-002).
(5) Make sure that the return pipe (27) and the control pipe (7) are removed.

HCU Pipe ** ON A/C NOT FOR ALL

(6) Make sure that the thrust-reverser hydraulic filter-assembly is removed (Ref. AMM TASK 78-37-51-000-003).

4. Procedure
Subtask 29-13-49-420-096-B ** ON A/C NOT FOR ALL

A. Installation of the Yellow HCU Pipe
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the PLUG-BLANKING from each disconnected line end.
(4) Put the HCU pipe (14) in position on the pylon.
(5) Connect the HCU pipe (14) to the pressure pipe (32).
(6) Attach the clamp (15) with the washer (16) and the bolt (17).
(7) Tighten the bolt (17).

NOTE: The clamp (13) is attached with the washer (16) and the bolt (17) in step 4.B.(1).

(8) TORQUE the nut (6) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

NOTE: The nut (12) is connected to the hydraulic filter canister (11) in the step 4.B.(1).

Subtask 29-13-49-420-096-C ** ON A/C NOT FOR ALL

A. Installation of the Yellow HCU Pipe
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the PLUG-BLANKING from each disconnected line end.
(4) Put the HCU pipe (14) in position on the pylon.
(5) Connect the HCU pipe (14) to the pressure pipe (32).
(6) Attach the clamps (15) with the washers (16) and the bolts (17).
(7) Tighten the bolts (17).

NOTE: The clamp (13) is attached with the washer (16) and the bolt (17) in step 4.B.(1).

(8) TORQUE the nut (6) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

NOTE: The nut (12) is connected to the hydraulic filter canister (11) in the step 4.B.(1).

Subtask 29-13-49-420-097-B ** ON A/C NOT FOR ALL

B. Close Access after the Installation of the Yellow HCU Pipe
(1) Install the thrust-reverser hydraulic filter-assembly (Ref. AMM TASK 78-37-51-400-003).

NOTE: The electrical connector connection to the isolation valve is not applicable in this step.

(2) Install the control pipe.

HCU Pipe ** ON A/C NOT FOR ALL

(a) Put the control pipe (7) in position in the pylon.
(b) Install the nut (3) and the washer (4) on the union (5) and tighten.
(c) Remove the PLUG-BLANKING from each disconnected line end.
(d) Connect the nut (2) to the union (5).
(e) Connect the control pipe (7) to the thrust-reverser hydraulic isolation-valve (33).
(f) Attach the clamp (25) to the support (26) with the bolt (24), the washer (23), the new AIPC 29-13-06-02-230 NUT (19) and tighten.
(g) Attach the clamp (10) with the bolt (8), the washer (9) and tighten.
(h) TORQUE the nut (2) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

.
(i) TORQUE the nut (34) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(3) Install the return pipe.

HCU Pipe ** ON A/C NOT FOR ALL

(a) Put the return pipe (27) in position in the pylon.
(b) Remove the PLUG-BLANKING from each disconnected line end.
(c) Connect the return pipe (27) to the case drain pipe (1).
(d) Connect the return pipe (27) to the thrust-reverser hydraulic isolation-valve (33).
(e) Attach the clamp (20) to the support (26) with the bolt (21), the washer (22) and the new AIPC 29-13-06-02-230 NUT (18) and tighten.
(f) Attach the clamp (30) with the bolt (28) and the washer (29) and tighten.
(g) TORQUE the nut (31) to between 4.57 and 4.47 m.daN (33.70 and 32.96 lbf.ft )

.
(h) TORQUE the nut (35) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

.
(4) Connect the FWD end of the engine fire-extinguishing pipe (Ref. AMM TASK 26-21-49-400-002).
(a) Connect the FWD end of the engine fire-extinguishing pipe to the pipe installed in the pylon and tighten it (Ref. AMM TASK 26-21-49-400-002).
(b) Install the bolts, the washers and the nuts that attach the FWD end of the pipe and tighten.
(5) In the pylon, attach the left and the right support plates (5) to the structure (4).

Support Plate ** ON A/C NOT FOR ALL

(a) Install the bolts (3), the washers (2), the new AIPC 54-57-17-04-020 NUTS (1) and tighten.
(6) Connect the thrust-reverser hydraulic-supply hoses (Ref. AMM TASK 29-13-49-400-045).
(a) At the left bracket, connect the hose to the pylon tube and tighten it (Ref. AMM TASK 29-13-49-400-045).
(b) Connect the four hoses to the left interface bracket and tighten them (Ref. AMM TASK 29-13-49-400-045).
(c) Put in position the clamps that hold the hoses.
(7) Connect the electrical connector to the thrust-reverser hydraulic isolation-valve.

HCU Pipe ** ON A/C NOT FOR ALL

(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connector (36) to the isolation valve (33).
(8) Install the left fan-cowl door (Ref. AMM TASK 71-13-11-400-040).

Subtask 29-13-49-420-097-D ** ON A/C NOT FOR ALL

B. Close Access after the Installation of the Yellow HCU Pipe
(1) Install the thrust-reverser hydraulic filter-assembly (Ref. AMM TASK 78-37-51-400-003).

NOTE: The electrical connector connection to the isolation valve is not applicable in this step.

(2) Install the control pipe.

HCU Pipe ** ON A/C NOT FOR ALL

(a) Put the control pipe (7) in position in the pylon.
(b) Install the bolts (4) and the washers (3) on the union (5) and tighten.
(c) Remove the PLUG-BLANKING from each disconnected line end.
(d) Connect the nut (2) to the union (5).
(e) Connect the control pipe (7) to the thrust-reverser hydraulic isolation-valve (33).
(f) Attach the clamp (25) to the support (26) with the bolt (24), the washer (23), the new AIPC 29-13-06-02-230 NUT (19) and tighten.
(g) Attach the clamp (10) with the bolt (8), the washer (9) and tighten.
(h) TORQUE the nut (2) to between 5.9 and 5.4 m.daN (43.51 and 39.82 lbf.ft )

.
(i) TORQUE the nut (34) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(3) Install the return pipe.

HCU Pipe ** ON A/C NOT FOR ALL

.
(h) TORQUE the nut (35) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

Support Plate ** ON A/C NOT FOR ALL

HCU Pipe ** ON A/C NOT FOR ALL

Subtask 29-13-49-410-089-B ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the container.
(3) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 29-13-49-440-056-B ** ON A/C NOT FOR ALL

D. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 29-13-49-865-092-A ** ON A/C NOT FOR ALL

E. 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
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-13-49-614-050-B ** ON A/C NOT FOR ALL

F. Pressurization of the Hydraulic Reservoir
(1) Pressurize the Yellow hydraulic reservoir of the engine 2 (Ref. AMM TASK 29-14-00-614-002).

Subtask 29-13-49-710-074-B ** ON A/C NOT FOR ALL

G. Operational Tests
(1) Do the operational test of the Yellow hydraulic system (Ref. AMM TASK 29-13-00-710-002).
(2) Operate the thrust reverser for ten deploy-to-stow cycles (Ref. AMM TASK 78-31-00-710-040).
(a) Make sure that the TEST OK indication comes into view on the MCDU.
(3) Make sure that there are no leaks at the tube connections.

5. Close-up
Subtask 29-13-49-410-091-B ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(3) Install the access panel:
(a) FOR [1000EM2] (ENGINE-2)
423AL.
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

Subtask 29-13-49-862-056-B ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 00:22:21 UTC