Installation of the Electric Pump Pressure-Switch

TASK 29-12-17-400-001-A
Installation of the Electric Pump Pressure-Switch

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: 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: 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.

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

FIN: 2074GJ

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	CAP - BLANKING
No specific	1	CONTAINER - HYDRAULIC FLUID RESISTANT
No specific	1	PLUG - BLANKING
No specific	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 3.470 and 3.186 m.daN (25.59 and 23.50 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 -
No specific	lockwire 0.8 mm (0.032 in.)

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195BB

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	O-RING	AIPC 29-12-03-12-070
2	O-RING	AIPC 29-12-03-12-140
3	O-RING	AIPC 29-12-03-12-140
2	O-RING	AIPC 29-12-83-04-170

E. Referenced Information

REFERENCE	DESIGNATION
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)
TASK 29-32-00-710-002-A	Operational Test of the Pressure Switches , Pressure Transducer and the associated Indicating System of the Blue Hydraulic System
Electric Pump Pressure-Switch ** ON A/C NOT FOR ALL
Electric Pump Pressure-Switch ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 29-12-17-860-052-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 Blue hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the reservoir of the Blue hydraulic system is depressurized.
(Ref. AMM TASK 29-14-00-614-001).
(4) Make sure that the access panel 195BB is open.
(5) Make sure that the CONTAINER - HYDRAULIC FLUID RESISTANT is in position.
(6) Make sure that the WARNING NOTICE(S) are 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.

Subtask 29-12-17-865-053-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
123VU	B HYD/ELEC PUMP	2701GJ	AB09

4. Procedure
Subtask 29-12-17-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Electric Pump Pressure Switch
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Lubricate the new AIPC 29-12-03-12-140 O-RING (3) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1)
(4) Remove the blanking plugs from the ports of the manifold.
(5) Put the new O-ring (3) in position on the pressure switch (2).
(6) Install the pressure switch (2) in the T-fitting (4) and TORQUE it to between 3.470 and 3.186 m.daN (25.59 and 23.50 lbf.ft )

(7) Safety the pressure switch (2) with lockwire 0.8 mm (0.032 in.).
(8) Remove the blanking cap from the electrical connector (1).
(9) Make sure that all the electrical connections are clean and in the correct condition.
(10) Connect the electrical connector (1).

Subtask 29-12-17-420-050-B ** ON A/C NOT FOR ALL

A. Installation of the Electric Pump Pressure-Switch

(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Lubricate the new AIPC 29-12-03-12-070 O-RING (2) or the new AIPC 29-12-03-12-140 O-RING (2) or the new AIPC 29-12-83-04-170 O-RING (2) with the Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(4) Remove the PLUG - BLANKING from the ports of the manifold.
(5) Put the new AIPC 29-12-03-12-070 O-RING (2) or the new AIPC 29-12-03-12-140 O-RING (2) or the new AIPC 29-12-83-04-170 O-RING (2) in position on the pressure switch (3).
(6) Install the pressure switch (3) in the switch manifold (1) and TORQUE to between 3.470 and 3.186 m.daN (25.59 and 23.50 lbf.ft )

.
(7) Safety the pressure switch (3) with the lockwire 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(8) Remove the CAP - BLANKING from the electrical connector (4).
(9) Make sure that all the electrical connections are clean and in the correct condition.
(10) Connect the electrical connector (4).

Subtask 29-12-17-865-052-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

Subtask 29-12-17-860-051-A

C. Preparation for the Test
(1) Remove the warning notices from the ground service panel and from the overhead panel.
(2) Pressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(3) Pressurize the Blue hydraulic system with the electric pump (Ref. AMM TASK 29-10-00-863-003).

Subtask 29-12-17-710-050-A

D. Test
(1) Do the operational test of the hydraulic pressure indicating-system (Ref. AMM TASK 29-32-00-710-002).
(2) Examine the connection of the pressure switch and make sure that there are no leaks.
(3) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).

5. Close-up
Subtask 29-12-17-860-053-A

A. Put the aircraft back to the serviceable condition.
(1) Remove the container.
(2) Remove the WARNING NOTICE(S).

Subtask 29-12-17-410-050-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 195BB.

[Rev.10 from 2021] 2026.04.01 00:18:56 UTC