Installation of the Reservoir Pressure Switch of the Blue Hydraulic System

TASK 29-34-11-400-002-A
Installation of the Reservoir Pressure Switch of the Blue Hydraulic System

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.

FIN: 2384GH

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	2	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.32 and 1.21 m.daN (116.81 and 107.08 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.04QAB2)	Coating_- Flexible Structure
(Material No.14CCB6)	Testing Medium-Leak Detection - Oxygen System
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 29-34-04-01-070
3	O-RING	AIPC 29-34-84-01-070

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 29-14-00-614-001-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 29-34-00-710-001-A	Operational Test of Reservoir Low Air Pressure Warning
Air Pressure Switch

3. Job Set-up
Subtask 29-34-11-860-056-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 WARNING NOTICE(S) are in position:

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

(5) Make sure that the access panel 197FB is open.
(6) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position.

Subtask 29-34-11-865-055-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
121VU	HYDRAULIC/LOW/LVL/IND	1832GQ	N32
121VU	HYDRAULIC/HYD/QTY/IND	1831GQ	P35
123VU	B HYD/ELEC PUMP	2701GJ	AB09

4. Procedure
Subtask 29-34-11-420-051-A

A. Installation of the Reservoir Pressure Switch
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking plugs from the pressure switch and the port on the top of the reservoir.
(4) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) to the AIPC 29-34-04-01-070 O-RING (3) or AIPC 29-34-84-01-070 O-RING (3).
(5) Install the O-ring (3) on the pressure switch (2).
(6) Install the pressure switch (2) on the reservoir.
(7) TORQUE the pressure switch (2) to between 1.32 and 1.21 m.daN (116.81 and 107.08 lbf.in )

.
(8) Safety the pressure switch (2) with lockwire 0.8 mm (0.032 in.).
(9) Make sure that the bonding jumper (5) and the area of the pressure switch (2) which it touches are clean.
(10) Apply Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the parts of the bonding jumper (5) and the pressure switch (2) which touch.
(11) Connect the bonding jumper (5) to the pressure switch (2).
(12) Install the bolt (7), the washer (6) and the nut (4). Tighten the nut (4).
(13) Remove the blanking caps from the electrical connector (1) and the pressure switch (2).
(14) Make sure that all the electrical connections are clean and in the correct condition.
(15) Connect the electrical connector (1) and the pressure switch (2).
(16) Apply Coating_- Flexible Structure (Material No.04QAB2) to the connection of the bonding jumper (5) and the pressure switch (2).

Subtask 29-34-11-790-051-A

B. Leak Test of the Hydraulic Connections
(1) Pressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-002).
(2) Apply Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the connection of the pressure switch (2) and the reservoir and make sure that there are no leaks.

Subtask 29-34-11-865-056-A

C. 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
121VU	HYDRAULIC/LOW/LVL/IND	1832GQ	N32
121VU	HYDRAULIC/HYD/QTY/IND	1831GQ	P35
123VU	B HYD/ELEC PUMP	2701GJ	AB09

Subtask 29-34-11-710-051-A

D. Do an operational test of the low air pressure warning (Ref. AMM TASK 29-34-00-710-001).

5. Close-up
Subtask 29-34-11-860-057-A

A. Put the aircraft back to the serviceable condition.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 197FB.
(3) Remove the access platform.
(4) Remove the warning notices from the cockpit and the ground service panel of the Blue hydraulic system.

Subtask 29-34-11-865-057-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
121VU	HYDRAULIC/LOW/LVL/IND	1832GQ	N32
121VU	HYDRAULIC/HYD/QTY/IND	1831GQ	P35
123VU	B HYD/ELEC PUMP	2701GJ	AB09

[Rev.10 from 2021] 2026.04.01 00:28:07 UTC