Servicing of the LP-Filter

TASK 29-12-44-610-001-A
Servicing of the LP-Filter

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.

FIN: 2002GM

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)
No specific	1	CONTAINER 3 L(3/4 USGAL)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	2	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
No specific	lockwire 0.8 mm (0.032 in.)

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
197FB

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	O-RING	AIPC 29-12-44-01-020
2	FILTER ELEMENT	AIPC 29-12-44-01-030

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
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 29-10-00-863-003-A	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-863-003-A-01	Pressurize the Blue Hydraulic System with the Blue Electric Pump
TASK 29-10-00-864-003-A	Depressurize the Blue 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)
LP Filter

3. Job Set-up
Subtask 29-12-44-865-050-A

A. 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

Subtask 29-12-44-010-051-A

B. Open the access panel 197FB.

Subtask 29-12-44-860-052-A

C. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Blue hydraulic system:

in the cockpit on the hydraulic section 40VU of the overhead panel,
on the ground service panel of the Blue hydraulic system.

(3) Make sure that the Blue hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(4) Depressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(5) Put the ACCESS PLATFORM 3M (10 FT) in position.
(6) Put the CONTAINER 3 L(3/4 USGAL) below the filter to collect any hydraulic fluid.

4. Procedure
Subtask 29-12-44-020-050-A

A. Removal of the Filter Element
(1) Cut and remove the lockwire between the filter bowl (4) and the filter head (1).
(2) Remove the filter bowl (4) together with the filter element (2).

NOTE: It is possible that the filter element (2) stays in the filter head (1). If it does, pull it out.

(3) Remove the filter element (2) from the filter bowl (4).
(4) Discard the filter element (2).
(5) Remove and discard the O-ring (3) from the outside of the filter bowl (4).

Subtask 29-12-44-560-050-A

B. Preparation for Installation
(1) Lubricate the new AIPC 29-12-44-01-020 O-RING (3) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) and install it on the filter bowl (4).
(2) Do a check of the correct condition and installation of the O-ring (6).

NOTE: The O-ring (6) is part of the filter element (2).

(3) Lubricate the O-ring (6) in the new AIPC 29-12-44-01-030 FILTER ELEMENT (2) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(4) Lubricate the threads of the filter bowl (4) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(5) If the red clogging indicator is out, push it in to set it again.

Subtask 29-12-44-420-050-A

C. Installation of the Filter Element
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Do a check of the filter element (2) and make sure that it is clean and not damaged.
(4) Install the filter element (2) together with its O-ring (6) in the filter bowl (4).
(5) Engage the filter bowl (4) together with the new O-ring (3) in the filter head (1) and tighten it.

NOTE: Tighten the filter bowl (4) with your hands only.

Subtask 29-12-44-865-051-A

D. 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

Subtask 29-12-44-790-050-A

E. Test of the Filter Assembly
(1) Remove the WARNING NOTICE(S).
(2) Pressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(3) Pressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-863-003).
(4) Make sure that the clogging indicator stays in.
(5) Make sure that no hydraulic fluid comes out of the filter assembly.
(6) Make sure that the fluid level in the reservoir of the Blue hydraulic system is correct. Add fluid as necessary (Ref. AMM TASK 12-12-29-611-001).
(7) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).

5. Close-up
Subtask 29-12-44-860-051-A

A. Put the aircraft back to the serviceable condition.
(1) Safety the filter bowl (4) to the filter head with lockwire 0.8 mm (0.032 in.).
(2) Remove the container from below the filter.
(3) Remove the access platform(s).

Subtask 29-12-44-410-051-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access panel 197FB.

[Rev.10 from 2021] 2026.04.01 04:43:55 UTC