Installation of the Engine-Pump Pressure Switch

TASK 29-13-17-400-040-A
Installation of the Engine-Pump Pressure Switch

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

WARNING: DO NOT TOUCH THE HYDRAULIC SYSTEM COMPONENTS FOR A SHORT TIME AFTER THE ENGINE IS SHUTDOWN. THE ENGINE COMPONENTS STAY HOT FOR SOME TIME AND CAN CAUSE INJURY.

CAUTION: DO NOT LET HYDRAULIC FLUID FALL ON THE ENGINE. UNWANTED HYDRAULIC FLUID MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT FREE CLOTH. THE FLUID CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.

FIN: 3074GD ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )
No specific	Torque wrench: range to between 36 and 32 lbf.in (0.41 and 0.36 m.daN )
No specific	Torque wrench: range to between 405 and 380 lbf.in (4.58 and 4.29 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
447AL

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	PACKING	AIPC 29-13-17-01-060
8	PACKING	AIPC 29-13-17-01-060

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-13-00-710-002-A	Operational Test of the Yellow 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 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
Engine-Pump Pressure Switch
Engine-Pump Pressure Switch

3. Job Set-up
Subtask 29-13-17-860-053-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the Yellow hydraulic system is depressurized (Ref. AMM TASK 29-10-00-864-002).
(2) Make sure that the Yellow hydraulic reservoir is depressurized (Ref. AMM TASK 29-14-00-614-001).
(3) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to pressurize the Yellow hydraulic system:

On the ground service panel 198CB.

(4) Make sure that the WARNING NOTICE(S) is (are) in position on the access door 195BB to tell persons not to pressurize the Yellow hydraulic reservoir.
(5) Make sure that an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position at the engine.
(6) Make sure that the fan cowl door 447AL is open (Ref. AMM TASK 71-13-00-010-040).

Subtask 29-13-17-941-055-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:

Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to start the engine.

(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) In the cockpit, on the HYD section of overhead panel 40VU:

Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to pressurize the Yellow hydraulic system.

(4) On overhead maintenance panel 50VU:

Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.

(5) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to energize FADEC 1(2).
(6) Make sure that the CONTAINER 5 L (1.32 USGAL) is below the hydraulic tube connection of the pressure switch to collect the hydraulic fluid.

Subtask 29-13-17-865-051-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37

4. Procedure
Subtask 29-13-17-420-053-A ** ON A/C NOT FOR ALL

A. Installation of the Engine-Pump Pressure Switch

Engine-Pump Pressure Switch ** ON A/C NOT FOR ALL

PRE SB RA32071-20

(1) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) on the new packing (3).
(2) Install the new AIPC 29-13-17-01-060 PACKING (3) on the pressure switch (2).
(3) Remove the COVER - BLANKING from the hydraulic tube.
(4) Install the pressure switch (2) on the hydraulic tube reducer.
(5) Hold the reducer with a WRENCH - STANDARD and TORQUE the pressure switch (2) to between 405 and 380 lbf.in (4.58 and 4.29 m.daN )

.
(6) Install the clamp assembly (6), screws (1), washers (5) and nuts (4).
(7) TORQUE the nuts (4) to between 36 and 32 lbf.in (0.41 and 0.36 m.daN )

.
(8) Remove the CAP - BLANKING from the electrical connector 3074GD-A.
(9) Connect electrical connector 3074GD-A to the pressure switch (2) and tighten it with your hand plus one-eighth of a turn.

END OF PRE SB RA32071-20

Subtask 29-13-17-420-051-A ** ON A/C NOT FOR ALL

B. Installation of the Engine-Pump Pressure Switch

Engine-Pump Pressure Switch ** ON A/C NOT FOR ALL

POST SB RA32071-20

(1) Apply Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) on the new packing (8).
(2) Install the new AIPC 29-13-17-01-060 PACKING (8) on the switch (4).
(3) Remove the COVER - BLANKING from the hydraulic tube.
(4) Install the pressure switch (4) on the hydraulic tube reducer.
(5) Hold the reducer with a WRENCH - STANDARD and TORQUE the pressure switch (4) to between 405 and 380 lbf.in (4.58 and 4.29 m.daN )

.
(6) Install the pressure switch (4) on the bracket with the clamp (3), screws (5), washers (2) and nuts (1).
(7) TORQUE the nuts (1) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(8) Attach the bonding jumper (9) to the bonding clamp on the pressure switch with the screw (6), washers (7) and (10), and nut (11).
(9) TORQUE the nut (11) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(10) Attach the other end of the bonding jumper (9) to the ground stud 9951DC on the ground plate with the fasteners retained during removal.
(11) TORQUE the nuts to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(12) Remove the CAP - BLANKING from the electrical connector 3074GD-A.
(13) Connect electrical connector 3074GD-A to the pressure switch (4) and tighten it with your hand plus one-eighth of a turn.

Subtask 29-13-17-865-052-A ** ON A/C NOT FOR ALL

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37

Subtask 29-13-17-710-051-A ** ON A/C NOT FOR ALL

D. Operational Test
(1) Pressurize the Yellow hydraulic reservoir (Ref. AMM TASK 29-14-00-614-002).
(2) Do an operational test of the Yellow hydraulic system (Ref. AMM TASK 29-13-00-710-002).
(3) During the dry motoring, make sure that there are no leaks from the LP pressure switch of the Yellow pump.
(4) Make sure that the level of hydraulic fluid in the Yellow reservoir is correct. Fill the reservoir if necessary (Ref. AMM TASK 12-12-29-611-001).

5. Close-up
Subtask 29-13-17-942-051-A ** ON A/C NOT FOR ALL

A. Remove the Safety Precautions
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).
(3) Make sure that the work area is clean and clear of tools and other items.

Subtask 29-13-17-410-051-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Close the left fan-cowl door 447AL (Ref. AMM TASK 71-13-00-410-040).
(2) Close the door 195BB.

[Rev.10 from 2021] 2026.04.01 00:19:59 UTC