Removal of the Yellow HCU Pipe for Flight without HCU Pipe Installed

TASK 29-13-49-000-049-A-01
Removal of the Yellow HCU Pipe for Flight without HCU Pipe Installed

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
To remove the HCU pipe when the spare HCU pipe is not available.

NOTE: The thrust reverser of the related engine will be deactivated during the flight.

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	CAP - BLANKING
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	1	PLIERS - NOSE, SOFT, LONG
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.8 and 0.5 m.daN (70.80 and 44.25 lbf.in )
No specific	Torque wrench: range to between 1.5 and 1.2 m.daN (132.74 and 106.19 lbf.in )
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
FOR [1000EM2] (ENGINE-2)
423AL, 447AL, 448AR, 461AL, 462AR

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
19	NUT	AIPC 29-13-06-02-230
18	NUT	AIPC 29-13-06-02-300
1	NUTS	AIPC 54-57-17-04-020

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 24-42-00-861-001-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 29-13-49-000-009-A	Removal of the Engine 2 Thrust-Reverser Hydraulic-Supply Hoses
TASK 29-13-49-400-009-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-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 71-13-11-000-041-A	Removal of the Fan Cowl Doors
TASK 71-13-11-400-041-A	Installation of the Fan Cowl Doors
TASK 78-30-00-040-040-B	Deactivation of the Thrust Reverser System
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
TASK 78-37-51-000-004-A	Removal of the Thrust Reverser Hydraulic Filter Assembly
TASK 78-37-51-400-004-A	Installation of the Thrust Reverser Hydraulic Filter Assembly
HCU Pipe ** ON A/C NOT FOR ALL
HCU Pipe ** ON A/C NOT FOR ALL
Support Plate

3. Job Set-up
Subtask 29-13-49-860-113-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(3) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).

Subtask 29-13-49-941-105-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the engine 2 shutdown occurred not less than five minutes before you do this procedure.
(2) On AIR COND panel 30VU:

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

(3) Put a WARNING NOTICE(S) 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.

(4) Put a WARNING NOTICE(S) in position on access door 195BB to tell persons not to pressurize the reservoir of the Yellow hydraulic system.
(5) 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.
Put WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 2 control switch.

(6) 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.
Put a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 2.

Subtask 29-13-49-865-100-A ** ON A/C NOT FOR ALL

C. Open, safety and tag 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 29-13-49-010-106-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Remove the access panel:
(a) FOR [1000EM2] (ENGINE-2)
423AL.
(2) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(3) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position at the zone 420.
(4) Put a CONTAINER 5 L (1.32 USGAL) in position below the hydraulic lines.

Subtask 29-13-49-040-068-A ** ON A/C NOT FOR ALL

E. 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) Do the deactivation of the thrust reverser system (Ref. AMM TASK 78-30-00-040-040).
(2) Make an entry in the logbook to tell the crew that the thrust reverser of the related engine is deactivated.

Subtask 29-13-49-010-107-A ** ON A/C NOT FOR ALL

F. Get Access
(1) Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 29-13-49-020-113-D ** ON A/C NOT FOR ALL

G. Get Access to the Yellow HCU Pipe
(1) Remove the left fan-cowl door (Ref. AMM TASK 71-13-11-000-041).
(2) Disconnect the electrical connector from the thrust-reverser hydraulic isolation-valve.

HCU Pipe ** ON A/C NOT FOR ALL

(a) Disconnect the electrical connector (36) from the thrust-reverser hydraulic isolation-valve (33).

NOTE: If necessary, use the PLIERS - NOSE, SOFT, LONG to loosen the electrical connector.

(b) Put CAP - BLANKING on the electrical connector of the harness and on the isolation valve.
(3) Disconnect the thrust-reverser hydraulic-supply hoses (Ref. AMM TASK 29-13-49-000-009).
(a) On the left interface bracket, disconnect the four hoses.
(b) At the left bracket, disconnect the hose from the pylon tube.
(c) Release the clamps that hold the five disconnected hoses.
(d) Push the five hoses into the pylon.
(4) Release the left and the right support plates in the pylon.

Support Plate ** ON A/C NOT FOR ALL

(a) Remove the bolts (3), the washers (2) and the nuts (1) that attach the plate (5) to the structure (4).
(b) Discard the nuts (1).
(5) Disconnect the FWD end of the engine fire-extinguishing pipe (Ref. AMM TASK 26-21-49-000-002).

NOTE: It is not necessary to remove the left thrust-reverser half.

(a) Remove the bolts, the washers and the nuts that attach the FWD end of the pipe.
(b) Disconnect the FWD end of the engine fire-extinguishing pipe and put it down on the fan case.
(6) Remove the return pipe.

HCU Pipe ** ON A/C NOT FOR ALL

(a) Remove the bolt (21), the washer (22) and the nut (18) from the clamp (20).
(b) Discard the nut (18).
(c) Remove the bolt (28) and the washer (29) from the clamp (30).
(d) Disconnect the return pipe (27) from the thrust-reverser hydraulic isolation-valve (33) and from the case drain pipe (1).
(e) Put the PLUG-BLANKING in each disconnected line end.
(f) Remove the return pipe (27) from the pylon.
(7) Remove the control pipe.

HCU Pipe ** ON A/C NOT FOR ALL

(a) Remove the bolt (8) and the washer (9) from the clamp (10).
(b) Remove the bolt (24), the washer (23) and the nut (19) from the clamp (25).
(c) Discard the nut (19) and keep the support (26).
(d) Disconnect the nut (2) from the union (5).
(e) Remove the bolts (4) and the washers (3) from the union (5).
(f) Disconnect the control pipe (7) from the thrust-reverser hydraulic isolation-valve (33).
(g) Put the PLUG-BLANKING in each disconnected line end.
(h) Remove the control pipe (7) from the pylon.
(8) Remove the thrust-reverser hydraulic filter-assembly (Ref. AMM TASK 78-37-51-000-004).

4. Procedure
Subtask 29-13-49-020-114-A ** ON A/C NOT FOR ALL

A. Removal of the Yellow HCU Pipe
(1) Remove the bolt (17) and the washer (16) from the clamp (15).

NOTE: The bolt (17) and the washer (16) are removed from the clamp (13) in the step 3.G.(8).

(2) Disconnect the HCU pipe (14) from the pressure pipe (32).
(3) Remove the HCU pipe (14) from the pylon.

NOTE: The nut (12) is disconnected from the hydraulic filter canister (11) in the step 3.G.(8).

Subtask 29-13-49-020-114-C ** ON A/C NOT FOR ALL

A. Removal of the Yellow HCU Pipe
(1) Remove the bolts (17) and the washers (16) from the clamps (15).

NOTE: The bolt (17) and the washer (16) are removed from the clamp (13) in the step 3.G.(8).

(2) Disconnect the HCU pipe (14) from the pressure pipe (32).
(3) Remove the HCU pipe (14) from the pylon.

NOTE: The nut (12) is disconnected from the hydraulic filter canister (11) in the step 3.G.(8).

Subtask 29-13-49-420-105-A ** ON A/C NOT FOR ALL

B. Installation of the Blanking Caps
(1) Clean the component interfaces and the adjacent area.
(2) Install the CAP - BLANKING on the coupling of the pressure pipe (32) and TORQUE to between 1.5 and 1.2 m.daN (132.74 and 106.19 lbf.in )

.
(3) Install the CAP - BLANKING on the outlet port of the hydraulic filter canister (11) and TORQUE to between 0.8 and 0.5 m.daN (70.80 and 44.25 lbf.in )

.
(4) Put a mark on the two blanking caps after you torque them (Ref. AMM TASK 20-23-22-910-001).
(5) Do an inspection of the blanking caps after 5 days to make sure that they are not loose and that the marks are aligned.

Subtask 29-13-49-420-106-D ** ON A/C NOT FOR ALL

C. Close Access after the Installation of the Blanking caps
(1) Install the thrust-reverser hydraulic filter-assembly (Ref. AMM TASK 78-37-51-400-004).

NOTE: The HCU pipe connection to the hydraulic filter canister is not applicable.

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

(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 29-13-06-02-300 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 29-13-49-400-009).
(a) At the left bracket, connect the hose to the pylon tube and tighten it (Ref. AMM TASK 29-13-49-400-009).
(b) Connect the four hoses to the left interface bracket and tighten them (Ref. AMM TASK 29-13-49-400-009).
(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 71-13-11-400-041).

Subtask 29-13-49-410-100-A ** ON A/C NOT FOR ALL

D. 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 29-13-49-865-101-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 29-13-49-614-054-A ** 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 29-13-49-710-079-A ** ON A/C NOT FOR ALL

G. Operational Test
(1) Do the operational test of the Yellow hydraulic system (Ref. AMM TASK 29-13-00-710-002).
(2) Make sure that there are no leaks at the connections of the blanking caps.

5. Close-up
Subtask 29-13-49-410-101-A ** 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 29-13-49-941-106-A ** ON A/C NOT FOR ALL

B. Put a WARNING NOTICE(S) in position in the cockpit to tell persons that the thrust reverser of the related engine cannot operate.

Subtask 29-13-49-862-060-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 00:22:44 UTC