Bleeding Procedure of the Blue Hydraulic System Upstream of the Blue E-Pump

TASK 29-00-00-870-008-A
Bleeding Procedure of the Blue Hydraulic System Upstream of the Blue E-Pump

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE 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.

1. Reason for the Job
Do this procedure after maintenance of the Blue hydraulic system upstream of the Blue E-pump
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	CONTAINER 10 L(2 1/2 USGAL)
No specific	1	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A	Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
TASK 29-00-00-210-001-A	Check for Air in the Green/Blue/Yellow Hydraulic System
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
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)
Installation of the Bleeding Adapter Hose at the Case Drain Filter Housing

3. Job Set-up
Subtask 29-00-00-860-071-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 replaced component is correctly installed.
(3) Make sure that the hydraulic reservoir of the Blue hydraulic system is depressurized (Ref. AMM TASK 29-14-00-614-001).
(4) Open the access door 195BB.

Subtask 29-00-00-865-073-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
123VU	B HYD/ELEC PUMP	2701GJ	AB09

4. Procedure
Subtask 29-00-00-870-064-A

A. Bleeding Procedure of the Blue Hydraulic System Upstream of the Blue E-Pump

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) Put a CONTAINER 10 L(2 1/2 USGAL) under the Blue E-pump.
(2) Disconnect the case drain line (2) of the Blue E-pump from the housing (1) of the case drain filter (2084GM).
(3) Install a PLUG - BLANKING (4) in the open port of the housing (1).
(4) Connect the adapter hose (3) to the case drain line (2).
(5) Put the end of the adapter hose (3) in the container.
(6) Make sure that the fluid level in the Blue reservoir is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(7) Slowly pressurize the Blue hydraulic reservoir so that the air or the mixture of hydraulic fluid and air comes out from the adapter hose (3) and into the container (Ref. AMM TASK 29-14-00-614-002).
(8) Depressurize the Blue hydraulic reservoir when the hydraulic fluid flows freely without air (Ref. AMM TASK 29-14-00-614-001).
(9) Disconnect the adapter hose (3) from the case drain line (2).
(10) Remove the blanking plug (4) from the housing (1).
(11) Make sure that the hydraulic line end-fittings are serviceable.
(12) Connect the case drain line (2) to the housing (1).
(13) TORQUE the nut of the case drain line (2) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(14) Keep the reservoir depressurization valve (2087GM) open and fill the reservoir to 7.0 l (1.8492 USgal).
(15) Pressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(16) Do the check for Air in the Blue hydraulic system (Ref. AMM TASK 29-00-00-210-001).
(a) If the check for air is not in the given limits, do the bleeding procedure again.

5. Close-up
Subtask 29-00-00-860-072-A

A. Put the aircraft back to the serviceable condition.
(1) Remove the containers.
(2) Make sure that the level of the hydraulic fluid in the reservoir of the Blue hydraulic system is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(3) Pressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Close the access door 195BB.

Subtask 29-00-00-865-075-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
123VU	B HYD/ELEC PUMP	2701GJ	AB09

[Rev.10 from 2021] 2026.04.01 00:13:18 UTC