Draining of the Thrust Reverser Hydraulic Tubes [CFML]

TASK 78-31-49-680-801-A
Draining of the Thrust Reverser Hydraulic Tubes

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

1. Reason for the Job
This procedure gives the instructions to drain the hydraulic fluid before maintenance on the Thrust Reverser Actuation System (TRAS).
Do this procedure only when specified by another maintenance task.

NOTE: The right hand lower actuator is also known as the synchronized manual locking actuator (3001KM2). The left hand lower actuator is also known as the synchronized non-locking actuator (3001KM3). The two upper actuators are also known as the synchronized locking feedback actuators (3001KM1) and (3001KM4).

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	CONTAINER 10 L(2 1/2 USGAL)
No specific	1	MAT - PROTECTIVE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )
No specific	Torque wrench: range to between 6.21 and 5.31 m.daN (45.80 and 39.16 lbf.ft )
No specific	Torque wrench: range to between 8.42 and 7.01 m.daN (62.09 and 51.70 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CPNCL00062)	LUBRICATING OIL TURBINE ENGINE SYNT BASE
(Material No.CPNCL02069)	LINT-FREE COTTON CLOTH

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
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 29-14-00-614-002-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 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 73-29-00-740-804-A	Thrust Reverser Cycling Test (Menu Mode)
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
TASK 78-31-45-000-801-A	Removal of the Manual Drive Unit (MDU)
TASK 78-31-45-400-801-A	Installation of the Manual Drive Unit (MDU)
TASK 78-32-50-010-801-A	Manually Deploy the Translating Cowl
TASK 78-32-50-410-801-A	Manually Stow the Translating Cowl
Draining of the Thrust Reverser Hydraulic Tubes
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs

3. Job Set-up
Subtask 78-31-49-941-132-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) 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.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 78-31-49-010-233-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the left fan cowl door.

Subtask 78-31-49-040-184-A

C. Deactivation of the Thrust Reverser System for Nacelle Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807).

Subtask 78-31-49-010-242-A

D. Get Access
(1) Manually deploy the translating cowl (Ref. AMM TASK 78-32-50-010-801).

Subtask 78-31-49-864-055-A

E. Depressurization of the Hydraulic System
(1) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the applicable system.
(a) On the HYD/FUEL panel 40VU of the overhead panel
(b) On the ground service panel of the applicable hydraulic system.
(2) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
(a) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(b) Depressurize the reservoir of the Green hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(3) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
(a) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).
(b) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).

4. Procedure
Subtask 78-31-49-680-071-A

A. Draining of the Thrust Reverser Mounted Hydraulic Tubes

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.

(1) Disconnect the Thrust Reverser Actuation System (TRAS) return line (3) from the check valve port (5) in the pylon floor as follows:
(a) Remove the two bolts (2) and harness bracket (1) from the support bracket (6).
(b) Move the harness bracket (1).
(c) Put a MAT - PROTECTIVE in position below the TRAS return line (3).
(d) Disconnect the coupling nut (4) from the check valve port (5).
(2) Drain the left hand hydraulic tubes from the left lower actuator (7) as follows:
(a) Put the CONTAINER 10 L(2 1/2 USGAL) in position below the left lower actuator (7).
(b) Remove the Manual Drive Unit (MDU) (8) from the left lower actuator (7) (Ref. AMM TASK 78-31-45-000-801).
(c) Drain the left hand hydraulic tubes into the CONTAINER 10 L(2 1/2 USGAL).
(d) Clean the left lower actuator (7) and the MDU (8) with LINT-FREE COTTON CLOTH (Material No.CPNCL02069) .
(e) Remove the CONTAINER 10 L(2 1/2 USGAL).
(f) Install the MDU (8) on the left lower actuator (7) (Ref. AMM TASK 78-31-45-400-801).
(3) Drain the left hand hydraulic tubes from the stow fitting (9) on the left lower actuator (7) as follows:
(a) Remove the bolts (16) that attach the two lower P-clamps (15) to the thrust reverser.
(b) Put the CONTAINER 10 L(2 1/2 USGAL) in position below the left lower actuator (7).
(c) Disconnect the hydraulic tube coupling nut (coupling nut) (10) from the stow fitting (9).
(d) Drain the left hand hydraulic tubes into the CONTAINER 10 L(2 1/2 USGAL).
(e) Clean the coupling nut (10) and the lower actuator (7) with LINT-FREE COTTON CLOTH (Material No.CPNCL02069) .
(f) Remove the CONTAINER 10 L(2 1/2 USGAL).
(g) Connect the coupling nut (10) to the stow fitting (9).
(h) TORQUE the coupling nut (10) to between 6.21 and 5.31 m.daN (45.80 and 39.16 lbf.ft )

.
(i) Install the bolts (16) that attach the two lower P-clamps (15) to the thrust reverser.
(j) TORQUE the two bolts (16) to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )

.
(4) Drain the right hand hydraulic tubes from the right lower actuator (13) as follows:

NOTE: Two WRENCH - STANDARD are necessary when you remove and install the MDU.

(a) Put the CONTAINER 10 L(2 1/2 USGAL) in position below the right lower actuator (13).
(b) Remove the MDU (12) from the right lower actuator (13) (Ref. AMM TASK 78-31-45-000-801).
(c) Drain the right hand hydraulic tubes into the CONTAINER 10 L(2 1/2 USGAL).
(d) Clean the right lower actuator (13) and the MDU (12) with LINT-FREE COTTON CLOTH (Material No.CPNCL02069) .
(e) Remove the CONTAINER 10 L(2 1/2 USGAL).
(f) Install the MDU (12) in the right lower actuator (13) (Ref. AMM TASK 78-31-45-400-801).
(5) Drain the right hand hydraulic tubes from the stow fitting (14) on the right lower actuator (13) as follows:
(a) Remove the bolts (16) that attach the two lower P-clamps (15) to the thrust reverser.
(b) Put the CONTAINER 10 L(2 1/2 USGAL) in position below the right lower actuator (13).
(c) Disconnect the coupling nut (11) from the stow fitting (14).
(d) Drain the right hand hydraulic tubes into the CONTAINER 10 L(2 1/2 USGAL).
(e) Clean the coupling nut (11) and the right lower actuator (13) with LINT-FREE COTTON CLOTH (Material No.CPNCL02069) .
(f) Remove the CONTAINER 10 L(2 1/2 USGAL).
(g) Connect the coupling nut (11) to the stow fitting (14).
(h) TORQUE the coupling nut (11) to between 6.21 and 5.31 m.daN (45.80 and 39.16 lbf.ft )

.
(i) Install the bolts (16) that attach the two lower P-clamps (15) to the thrust reverser.
(j) TORQUE the two bolts (16) to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )

.
(6) Connect the TRAS return line (3) to the check valve port (5) as follows:
(a) Connect the coupling nut (4) on the TRAS return line (3) to the check valve port (5) on the pylon floor.
(b) TORQUE the coupling nut (4) to between 8.42 and 7.01 m.daN (62.09 and 51.70 lbf.ft )

.
(7) Lubricate the threads of the two bolts (2) with LUBRICATING OIL TURBINE ENGINE SYNT BASE (Material No.CPNCL00062) .
(8) Install the harness bracket (1) as follows:
(a) Install the two bolts (2) that attach the harness bracket (1) to the support bracket (6).
(b) TORQUE the two bolts (2) to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )

5. Close-up
Subtask 78-31-49-863-051-A

A. Pressurization of the Hydraulic System
(1) FOR 4020KM1
(a) Pressurize the reservoir of the Green hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(b) Pressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-863-001).
(2) For 4020KM2
(a) Pressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(b) Pressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-863-002).

Subtask 78-31-49-410-126-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Manually stow the translating cowl (Ref. AMM TASK 78-32-50-410-801).

Subtask 78-31-49-440-121-A

C. Do the reactivation of the thrust reverser system after nacelle maintenance (Ref. AMM TASK 78-30-00-440-807).

Subtask 78-31-49-410-127-A

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 78-31-49-740-050-A

E. Test
(1) Do a thrust reverser cycling test (menu mode) (Ref. AMM TASK 73-29-00-740-804).
(2) Do a visual inspection of the MDUs and lower actuators to make sure that there is no leakage.

[Rev.10 from 2021] 2026.04.01 03:35:22 UTC