Installation of the Engine-Pump Pressure Switch

TASK 29-13-17-400-010-A
Installation of the Engine-Pump Pressure Switch

WARNING: DO NOT GET HYDRAULIC FLUID ON YOUR SKIN, IN YOUR EYES OR IN YOUR MOUTH. HYDRAULIC FLUID IS POISONOUS AND CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY. FLUSH HYDRAULIC FLUID FROM YOUR EYES, MOUTH OR SKIN WITH WATER. GET MEDICAL AID IF YOU GET HYDRAULIC FLUID IN YOUR EYES OR MOUTH.

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

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
This task gives the procedure to install the engine-pump pressure
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	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 44 and 36 lbf.in (0.50 and 0.41 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.V01-002)	cleaning fluid
(Material No.V02-147)	lockwire
(Material No.02ABA1)	Phosphate Ester Hydraulic Fluid-General Power - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	PACKING	AIPC 29-13-17-80-020

D. Referenced Information

REFERENCE	DESIGNATION
TASK 29-10-00-200-001-A	Check Fluid Level on Reservoir Indicators
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 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 70-23-13-911-010-A	Procedures for the Installation of Preformed Packings
TASK 70-23-15-912-010-A	Connection of Electrical Connectors
TASK 70-30-00-918-010-A	Consumable Materials Index
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Engine-Pump Pressure Switch

3. Job Set-up
Subtask 29-13-17-860-051-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 reservoir of the Yellow hydraulic system 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 is open.

Subtask 29-13-17-941-051-A ** ON A/C NOT FOR ALL

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

make sure that 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 5 minutes before you do this procedure.
(3) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to pressurize the Yellow hydraulic system:

in the cockpit, on the HYD section of the overhead panel 40VU.

(4) On the 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 the FADEC 1(2).
(6) Make sure that a CONTAINER 5 L (1.32 USGAL) is below the hydraulic tube connection.

Subtask 29-13-17-865-057-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 29-13-17-110-050-A ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Remove the covers, caps, plugs from the adapter (1), the switch (3) and the electrical connector (4).
(2) Clean the replacement parts and their interfaces:
(a) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with cleaning fluid (Material No.V01-002) , to clean the adapter (1), the switch (3) and the electrical connector (4).
(b) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) to remove the dirty cleaning fluid from the parts while they are wet.
(3) Examine the replacement parts and their interfaces. Make sure that they have no damage.

Subtask 29-13-17-420-050-B ** ON A/C NOT FOR ALL

B. Installation of the Engine Pump Pressure Switch
(1) Clean the replacement parts and their interfaces:
(a) Use a clean lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) made moist with cleaning fluid (Material No.V01-002) to clean the adapter (1), pressure switch (3) and electrical connector (4).
(2) Use a clean lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) to remove the dirty cleaning fluid from the parts while they are wet.
(3) Examine the replacement parts and their interfaces. Make sure that they have no damage.
(4) Install the pressure switch (3):
(a) Lubricate a new AIPC 29-13-17-80-020 PACKING (2) and the threads of the pressure switch (3) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(b) Put the packing (2) on to the pressure switch (3) (Ref. AMM TASK 70-23-13-911-010) (Ref. AMM TASK 70-30-00-918-010).
(c) Install the pressure switch (3) with the packing (2) into the adapter (1).
(d) Put the P-clip (7) around the pressure switch (3) in the correct position for installation.
(e) Attach the P-clip (7) to the clipnut (10) on the bracket (9) with the bolt (8).
(f) Tighten the bolt (8) with your hand.
(g) Hold the adapter (1) with the applicable WRENCH - STANDARD and TORQUE the pressure switch (3) to between 405 and 380 lbf.in (4.58 and 4.29 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

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.

(h) Safety the pressure switch (3) to the nearest anchor tab (5) with lockwire (Material No.V02-147) (6).
(i) TORQUE the bolt (8) to between 44 and 36 lbf.in (0.50 and 0.41 m.daN )

.
(j) Connect the electrical connector (4) to the pressure switch (3) (Ref. AMM TASK 70-23-15-912-010).
(5) Remove the container and discard the drained hydraulic fluid.

Subtask 29-13-17-865-058-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 29-13-17-710-050-A ** ON A/C NOT FOR ALL

D. Operational Test
(1) Do a check of the hydraulic fluid level in the reservoir (Ref. AMM TASK 29-10-00-200-001).
(2) Do an operational test of the Yellow hydraulic system (Ref. AMM TASK 29-13-00-710-002).
(3) During the dry motoring of the engine 2, make sure that there is no leak from the pressure switch.

5. Close-up
Subtask 29-13-17-942-050-A ** ON A/C NOT FOR ALL

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

Subtask 29-13-17-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Close the fan cowl doors 447AL, 448AR (Ref. AMM TASK 71-13-00-410-010).
(2) Close the door 195BB.

[Rev.10 from 2021] 2026.04.01 00:20:03 UTC