Installation of the Green/Yellow Power Transfer Unit

TASK 29-23-41-400-001-A
Installation of the Green/Yellow Power Transfer Unit

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

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.

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

FIN: 1088GM

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 3M (10 FT)- ADJUSTABLE
No specific	1	CONTAINER - HYDRAULIC FLUID RESISTANT
No specific	3	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )
No specific	Torque wrench: range to between 1.3 and 1.2 m.daN (115.04 and 106.19 lbf.in )
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 10.7 and 9.7 m.daN (78.91 and 71.53 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-36-29-170-004-A	Flushing of the Green Hydraulic System of the Power Transfer Unit (PTU)
TASK 12-36-29-170-005-A	Flushing of the Yellow Hydraulic System of the Power Transfer Unit (PTU)
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
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 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
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 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-11-44-610-001-A	Servicing of the LP-Filter
TASK 29-11-45-610-001-A	Servicing of the HP-Filter
TASK 29-13-44-610-001-A	Servicing of the LP-Filter
TASK 29-13-45-610-001-A	Servicing of the HP-Filter
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 29-23-00-710-002-A	Functional Check of the Power Transfer Unit (PTU) Green to Yellow
TASK 29-23-00-710-003-A	Functional Check of the Power Transfer Unit (PTU) Yellow to Green
TASK 29-23-00-710-004-A	Operational Test of the Power Transfer Unit (PTU) with the Engine Pumps
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 29-24-00-863-001-A	Pressurize the Yellow Hydraulic System with the Electric Pump
TASK 29-24-00-864-001-A	Depressurize the Yellow Hydraulic System
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 71-00-00-710-001-A	Dry Motoring Check
TASK 71-00-00-710-001-B	Dry Motoring Check
TASK 71-00-00-710-045-A	Test No.1 : Dry Motor Leak Check
TASK 71-00-00-860-817-A	Motor the Engine (Dry Method)
Inspection of the PTU Shock Mounts
Green/Yellow Power Transfer Unit

3. Job Set-up
Subtask 29-23-41-860-053-A

A. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Make sure that the WARNING NOTICE(S) are in position to tell persons not to pressurize the Green and Yellow hydraulic systems:

In the cockpit on the hydraulic section 40VU of the overhead panel
On the ground service panel of the Green and Yellow hydraulic systems.

(3) Make sure that the left and right main landing gear doors are open (Ref. AMM TASK 32-12-00-010-001).
(4) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position.
(5) Make sure that the Green and Yellow hydraulic systems are depressurized and put them in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(6) Make sure that the reservoirs of the Green and Yellow hydraulic systems are depressurized (Ref. AMM TASK 29-14-00-614-001).
(7) Make sure that a CONTAINER - HYDRAULIC FLUID RESISTANT is in position under the hydraulic connections of the power transfer unit.
(8) Make sure that the isolation coupling of the power transfer unit (PTU) is disconnected (Ref. AMM TASK 29-23-00-860-001).

Subtask 29-23-41-865-052-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
** ON A/C NOT FOR ALL
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C ALL
121VU	HYDRAULIC/Y HYD/PUMP ENG2/CTL	3701GD	Q36
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33
** ON A/C ALL
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-23-41-220-050-A

C. Inspection of the Power Transfer Unit Shock Mounts

Inspection of the PTU Shock Mounts

(1) Clean the PTU shock mounts (37).
(2) Make sure that the PTU shock mounts (37) show no corrosion, open wires, dents or any other damage.
(3) Make sure that the dimension between the PTU attachment plate (35) and the dampener body (36) is between 3.75 mm (0.1476 in.) and 5.75 mm (0.2264 in.).
(4) If necessary, replace the PTU shock mount(s) (37).

4. Procedure
Subtask 29-23-41-420-050-C ** ON A/C NOT FOR ALL

A. Installation of the Power Transfer Unit

CAUTION: FILL THE POWER TRANSFER UNIT WITH HYDRAULIC FLUID BEFORE YOU CONNECT THE HYDRAULIC LINES. IF NOT YOU WILL CAUSE DAMAGE TO THE POWER TRANSFER UNIT.

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.

CAUTION: YOU MUST INSTALL HYDRAULIC TUBES WITH HYDRAULIC FLUID AS LUBRICANT.

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.

NOTE: Make sure that there is no stress on the hydraulic hoses and pipes and that there is sufficient space between them. Do not fully tighten the unions and nuts before all of the hydraulic hoses and pipes are connected. Make sure that the shock mounts do not turn when you tighten the bolts (12).

(3) Put the power transfer unit (7) with the spacers (23) in position on the support plate (8).
(4) Loosely install the bolts (12) and the washers (11).
(5) TORQUE the bolts (12) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

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.

(6) Safety the bolts (12) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(7) Remove the blanking caps from the ports of the power transfer unit (7).
(8) Remove the PLUG-BLANKING from each disconnected line end.
(9) Make sure that the hydraulic line end-fittings are serviceable.
(10) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the threads of the line end-fittings.
(11) Put Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) into the HP, LP and case drain ports of the PTU until the unit is completely full.
(12) Connect the hose to the HP port (15) of the Yellow hydraulic system.
(13) TORQUE the union nut (16) to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

(14) Connect the self-sealing coupling (14) to the LP port (13) of the Yellow hydraulic system.
(15) TORQUE the coupling (14) to between 10.7 and 9.7 m.daN (78.91 and 71.53 lbf.ft )

.
(16) Connect the self-sealing coupling (4) to the LP port (5) of the Green hydraulic system.
(17) TORQUE the coupling (4) to between 10.7 and 9.7 m.daN (78.91 and 71.53 lbf.ft )

.
(18) Connect the hose to the HP port (6) of Green hydraulic system.
(19) TORQUE the union nut (3) to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

.
(20) Connect the hose to the case drain port (18) of the Green hydraulic system.
(21) TORQUE the union nut (2) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(22) Connect the hose to the case drain port (17) of the Yellow hydraulic system.
(23) TORQUE the union nut (1) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(24) Connect the bonding strap (19) to the power transfer unit (7) with the screw (21), the washer (22) and the nut (20) (Ref. AMM TASK 20-28-00-912-802).
(25) Connect the hose to the seal drain port (10).
(26) TORQUE the union nut (9) to between 1.3 and 1.2 m.daN (115.04 and 106.19 lbf.in )

Subtask 29-23-41-420-050-E ** ON A/C NOT FOR ALL

A. Installation of the Power Transfer Unit

CAUTION: FILL THE POWER TRANSFER UNIT WITH HYDRAULIC FLUID BEFORE YOU CONNECT THE HYDRAULIC LINES. IF NOT YOU WILL CAUSE DAMAGE TO THE POWER TRANSFER UNIT.

CAUTION: YOU MUST INSTALL HYDRAULIC TUBES WITH HYDRAULIC FLUID AS LUBRICANT.

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.

NOTE: It is not permitted to use high-density fluid Skydrol 500B-4.

(12) Connect the hose to the HP port (15) of the Yellow hydraulic system.
(13) TORQUE the union nut (16) to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

.
(14) Connect the self-sealing coupling (14) to the LP port (13) of the Yellow hydraulic system.
(15) TORQUE the coupling (14) to between 10.7 and 9.7 m.daN (78.91 and 71.53 lbf.ft )

.
(16) Connect the self-sealing coupling (4) to the LP port (5) of the Green hydraulic system.
(17) TORQUE the coupling (4) to between 10.7 and 9.7 m.daN (78.91 and 71.53 lbf.ft )

.
(18) Connect the hose to the HP port (6) of Green hydraulic system.
(19) TORQUE the union nut (3) to between 8.3 and 7.5 m.daN (61.21 and 55.31 lbf.ft )

.
(20) Connect the hose to the case drain port (18) of the Green hydraulic system.
(21) TORQUE the union nut (2) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(22) Connect the hose to the case drain port (17) of the Yellow hydraulic system.
(23) TORQUE the union nut (1) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

Subtask 29-23-41-865-053-A

B. 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	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
** ON A/C NOT FOR ALL
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C ALL
121VU	HYDRAULIC/Y HYD/PUMP ENG2/CTL	3701GD	Q36
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33
** ON A/C ALL
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-23-41-860-051-A

C. Preparation for the Test

NOTE: The inspection of the hydraulic filter elements is applicable only if you replace the PTU because of contamination. You can ignore this inspection if you do a scheduled replacement of the PTU, a replacement of the PTU after a small leakage and other.

(1) Do a check of the filter element of the Green LP filter 1002GM. If you find contamination in the filter elements, replace the filter elements (Ref. AMM TASK 29-11-44-610-001).
(2) Do a check of the filter element of the Green HP filter 1048GM. If you find contamination in the filter elements, replace the filter elements (Ref. AMM TASK 29-11-45-610-001).
(3) If you find contamination in the filter elements (for example: particles, jelly):

Do the flushing procedure of the Green hydraulic system of the PTU (Ref. AMM TASK 12-36-29-170-004).

(4) Do a check of the filter element of the Yellow LP filter 3002GM. If you find contamination in the filter elements, replace the filter elements (Ref. AMM TASK 29-13-44-610-001).
(5) Do a check of the filter element of the Yellow HP filter 3048GM. If you find contamination in the filter elements, replace the filter elements (Ref. AMM TASK 29-13-45-610-001).
(6) If you find contamination in the filter elements (for example: particles, jelly):

Do the flushing procedure of the Yellow hydraulic system of the PTU (Ref. AMM TASK 12-36-29-170-005).

(7) Remove the warning notices.
(8) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
(9) Pressurize the reservoirs of the Green and Yellow hydraulic systems (Ref. AMM TASK 29-14-00-614-002).
(10) Make sure that the fluid level in the reservoirs of the Green and Yellow hydraulic systems is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001).
(11) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 29-23-41-870-050-A

D. Bleeding Procedure of the PTU with the Electric Pump of the Yellow Hydraulic System and a Ground Hydraulic Supply

NOTE: The procedure that follows is done with a ground hydraulic supply. If the ground hydraulic supply is not available, do the procedure with the engine dry motoring (Ref. Para 4.E.).

(1) Make sure that the isolation coupling of the PTU is connected.
(2) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(3) On the panel 40VU:
(a) Make sure that the OFF light of the PTU P/BSW is on.
(4) Pressurize the Green hydraulic system with a ground cart (Ref. AMM TASK 29-10-00-863-001).
(5) Pressurize the Yellow hydraulic system with the E-pump (Ref. AMM TASK 29-24-00-863-001).
(6) Make sure that the pressure in the hydraulic systems is approximately 3000 psi (206.8427 bar).
(7) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW goes off.
(8) Make sure that the PTU does not start.
(9) Keep the hydraulic systems pressurized for a minimum of 15 minutes.
(10) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(11) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW comes on.
(12) Depressurize the Green and Yellow hydraulic systems (Ref. AMM TASK 29-10-00-864-001) and (Ref. AMM TASK 29-24-00-864-001).
(13) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW goes off.
(14) Slowly pressurize the Green hydraulic system with the ground cart until the PTU starts to operate (Ref. AMM TASK 29-10-00-863-001).
(15) Let the PTU operate for a minimum of 5 minutes.
(16) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(17) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW comes on.
(18) Make sure that the PTU stops.
(19) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(20) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW goes off.
(21) Pressurize the Yellow hydraulic system with the E-pump (Ref. AMM TASK 29-24-00-863-001).
(22) Make sure that the PTU starts to operate.
(23) Let the PTU operate for a minimum of 5 minutes.
(24) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(25) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW comes on.
(26) Make sure that the PTU stops.
(27) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-24-00-864-001).
(28) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 29-23-41-870-051-A ** ON A/C NOT FOR ALL

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.

CAUTION: DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.

E. Bleeding Procedure of the PTU with the left Engine Pump and the Electric Pump of the Yellow Hydraulic System

NOTE: The procedure that follows is done with the engine dry motoring. For the bleeding procedure with a ground hydraulic supply, go to Para 4.D.

(1) Make sure that the isolation coupling of the PTU is connected.
(2) Make sure that the parking brake is in the OFF position.
(3) Make sure that the nose wheel steering is not deactivated.
(4) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(5) On the panel 40VU:
(a) Make sure that the OFF light of the PTU P/BSW is on.
(6) Pressurize the Yellow hydraulic system with the E-pump (Ref. AMM TASK 29-24-00-863-001).
(7) Pressurize the Green hydraulic system by dry motoring the left engine for a maximum of 4 minutes (Ref. AMM TASK 71-00-00-700-805).

NOTE: When you do the dry motoring, obey the starter limits.

(8) Make sure that the pressure in the hydraulic systems is approximately 3000 psi (206.8427 bar).
(9) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW goes off.
(10) Make sure that the PTU does not start.
(11) Keep the hydraulic systems pressurized for a minimum of 3 minutes.
(12) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(13) Stop the dry motoring of the left engine after 4 minutes (Ref. AMM TASK 71-00-00-700-805).
(14) Make sure that the PTU starts to operate.
(15) Let the PTU operate for a minimum of 5 minutes.
(16) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(17) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW comes on.
(18) Make sure that the PTU stops.
(19) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-24-00-864-001).
(20) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW goes off.
(21) Pressurize the Green hydraulic system by dry motoring the left engine for a maximum of 4 minutes (Ref. AMM TASK 71-00-00-710-001).

NOTE: When you do the dry motoring, obey the starter limits.

(22) Make sure that the PTU starts to operate.
(23) Let the PTU operate for a minimum of 3 minutes.
(24) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(25) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW comes on.
(26) Make sure that the PTU stops.
(27) Stop the dry motoring of the left engine after 4 minutes (Ref. AMM TASK 71-00-00-710-001).
(28) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 29-23-41-870-051-B ** ON A/C NOT FOR ALL

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.

CAUTION: DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.

E. Bleeding Procedure of the PTU with the left Engine Pump and the Electric Pump of the Yellow Hydraulic System

NOTE: The procedure that follows is done with the engine dry motoring. For the bleeding procedure with a ground hydraulic supply, go to Para 4.D.

NOTE: When you do the dry motoring, obey the starter limits.

(8) Make sure that the pressure in the hydraulic systems is approximately 3000 psi (206.8427 bar).
(9) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW goes off.
(10) Make sure that the PTU does not start.
(11) Keep the hydraulic systems pressurized for a minimum of 3 minutes.
(12) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(13) Stop the dry motoring of the left engine after 4 minutes (Ref. AMM TASK 71-00-00-710-001).
(14) Make sure that the PTU starts to operate.
(15) Let the PTU operate for a minimum of 5 minutes.
(16) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(17) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW comes on.
(18) Make sure that the PTU stops.
(19) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-24-00-864-001).
(20) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW goes off.
(21) Pressurize the Green hydraulic system by dry motoring the left engine for a maximum of 4 minutes (Ref. AMM TASK 71-00-00-710-001).

NOTE: When you do the dry motoring, obey the starter limits.

Subtask 29-23-41-870-051-C ** ON A/C NOT FOR ALL

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.

CAUTION: DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.

E. Bleeding Procedure of the PTU with the left Engine Pump and the Electric Pump of the Yellow Hydraulic System

NOTE: The procedure that follows is done with the engine dry motoring. For the bleeding procedure with a ground hydraulic supply, go to Para 4.D.

NOTE: When you do the dry motoring, obey the starter limits.

(8) Make sure that the pressure in the hydraulic systems is approximately 3000 psi (206.8427 bar).
(9) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW goes off.
(10) Make sure that the PTU does not start.
(11) Keep the hydraulic systems pressurized for a minimum of 3 minutes.
(12) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(13) Stop the dry motoring of the left engine after 4 minutes (Ref. AMM TASK 71-00-00-710-045).
(14) Make sure that the PTU starts to operate.
(15) Let the PTU operate for a minimum of 5 minutes.
(16) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(17) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW comes on.
(18) Make sure that the PTU stops.
(19) Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-24-00-864-001).
(20) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW goes off.
(21) Pressurize the Green hydraulic system by dry motoring the left engine for a maximum of 4 minutes (Ref. AMM TASK 71-00-00-710-045).

NOTE: When you do the dry motoring, obey the starter limits.

(22) Make sure that the PTU starts to operate.
(23) Let the PTU operate for a minimum of 3 minutes.
(24) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(25) On the panel 40VU:
(a) Push the PTU P/BSW.
(b) Make sure that the OFF light of the PTU P/BSW comes on.
(26) Make sure that the PTU stops.
(27) Stop the dry motoring of the left engine after 4 minutes (Ref. AMM TASK 71-00-00-710-045).
(28) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 29-23-41-710-050-A

F. Test

NOTE: As an alternative procedure to the subsequent test, you can do the operational test of the PTU with the engine pumps (Ref. AMM TASK 29-23-00-710-004).

(1) Do the operational test of the PTU (power transfer Green to Yellow hydraulic system) (Ref. AMM TASK 29-23-00-710-002).
(2) Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(3) Do the operational test of the PTU (power transfer Yellow to Green hydraulic system) (Ref. AMM TASK 29-23-00-710-003).
(4) Examine the hydraulic connections of the PTU and make sure that there are no leaks.

5. Close-up
Subtask 29-23-41-860-052-A

A. Put the aircraft back to the serviceable condition.
(1) Make sure that the fluid level in the reservoirs of the Green and Yellow hydraulic systems is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001) .
(2) Remove the containers from below the hydraulic connections.
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Remove the access platform.
(5) Close the left and right main landing gear doors (Ref. AMM TASK 32-12-00-410-001).

[Rev.10 from 2021] 2026.04.01 00:26:48 UTC