Installation of the Engine-Pump Pressure Switch

TASK 29-13-17-400-041-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	1	OHMMETER MULTIRANGE
No specific	AR	WARNING NOTICE(S)
No specific	2	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 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 - -
(Material No.03ABA1)	Synthetic base Lubricating Oil-Turbine Engine - -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
447AL

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
25	PACKING	AIPC 29-13-49-03-310

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A	Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
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 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
Engine-Pump Pressure Switch
Engine-Pump Pressure Switch (POST SB RA32029-13)
Engine Pump Pressure Switch (POST SB RA32029-15) or (POST SB RA32029-16)

3. Job Set-up
Subtask 29-13-17-860-055-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 29-13-17-941-054-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 a CONTAINER 5 L (1.32 USGAL) is below the pressure switch (3) to collect the hydraulic fluid.

Subtask 29-13-17-865-054-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 29-13-17-420-054-A ** ON A/C NOT FOR ALL

A. Preparation before Installation

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

Engine-Pump Pressure Switch (POST SB RA32029-13) ** ON A/C NOT FOR ALL

Engine Pump Pressure Switch (POST SB RA32029-15) or (POST SB RA32029-16) ** ON A/C NOT FOR ALL

(1) Install the engine-pump pressure switch.

PRE SB RA32029-13

(a) Remove the COVER - BLANKING from the hydraulic tube (5) and the pressure switch (3).
(b) Clean the bonding surfaces of the clamp (2) and the pressure switch (3) with the Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(c) Make sure that the electrical bond is correct between the pressure switch (3), the clamp (2) and the ground stud of the channel bracket (4).
(d) Put the bonding clamp (9) on the pressure switch (3).
(e) Attach the bonding jumper (10) to the bonding clamp (9) with the bolt (12), the washers (7), (8) and (11), and the nut (6).
(f) TORQUE the nut (6) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(g) Do an electrical resistance check as follows:
1 Put one lead of the OHMMETER MULTIRANGE on the pressure switch (3).
2 Put the other lead of the OHMMETER MULTIRANGE on the bonding clamp (9).
3 Make sure that the resistance measured between the OHMMETER MULTIRANGE leads is 0.0025 ohm or less.
4 Put one lead of the OHMMETER MULTIRANGE on the pressure switch (3).
5 Put the other lead of the OHMMETER MULTIRANGE on the ground stud on the channel bracket (4).
6 Make sure that the resistance measured between the OHMMETER MULTIRANGE leads is 0.0025 ohm or less.
7 If the resistance is more than 0.0025 ohm, remove the bonding clamp (9) and clean the bonding surfaces again.
8 Do this procedure until the resistance indication is in the correct range.
(h) Install the pressure switch (3) on the channel bracket (4) with the clamp (2) and the bolts (1).
(i) TORQUE the bolts (1) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(j) Connect the hydraulic tube (5) to the pressure switch (3).
1 Hold the pressure switch (3) with a second WRENCH - STANDARD when you torque the coupling nut on the tube (5).
(k) TORQUE the coupling nut on the hydraulic tube (5) to between 405 and 380 lbf.in (4.58 and 4.29 m.daN )

.
(l) Remove the CAP - BLANKING from electrical connector 3074GD-A.
(m) Connect electrical connector 3074GD-A to the pressure switch (3) and tighten it with your hand plus one-eighth of a turn.

END OF PRE SB RA32029-13

(2) Install the engine-pump pressure switch.

Engine-Pump Pressure Switch (POST SB RA32029-13) ** ON A/C NOT FOR ALL

POST SB RA32029-13

(a) Remove the COVER - BLANKING from the hydraulic tube (5) and the pressure switch (4).
(b) Put the bonding clamp (11) on the pressure switch (4).
(c) Attach the bonding jumper (7) to the bonding clamp (11) with the bolt (13), the washers (9), (10) and (12), and the nut (8).
(d) TORQUE the nut (8) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(e) Install the pressure switch (4) on the channel bracket (6) with the master electrical keyway forward. Use the clamp (3), the bolts (1) and the washers (2).
(f) Make sure that the bonding jumper (7) is installed below the clamp.
(g) TORQUE the bolts (1) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(h) Do an electrical resistance check as follows:
1 Put one lead of the OHMMETER MULTIRANGE on the pressure switch (4).
2 Put the other lead of the OHMMETER MULTIRANGE on the bonding clamp (11).
3 Make sure that the resistance measured between the OHMMETER MULTIRANGE leads is 0.0025 ohm or less.
4 Put one lead of the OHMMETER MULTIRANGE on the pressure switch (4).
5 Put the other lead of the OHMMETER MULTIRANGE on the ground stud on the channel bracket (6).
6 Make sure that the resistance measured between the OHMMETER MULTIRANGE leads is 0.0025 ohm or less.
7 If the resistance is more than 0.0025 ohm, remove the bonding clamp (11) and clean the bonding surfaces again.
8 Do this procedure until the resistance indication is in the correct range.
(i) Lubricate the coupling of the hydraulic tube (5) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) .
(j) Connect the hydraulic tube (5) to the pressure switch (4).
(k) TORQUE the coupling nut on the hydraulic tube (5) to between 405 and 380 lbf.in (4.58 and 4.29 m.daN )

.
1 Hold the pressure switch (4) with a second WRENCH - STANDARD when you torque the coupling nut on the hydraulic tube (5).
(l) Remove the CAP - BLANKING from electrical connector 3074GD-A.
(m) Connect electrical connector 3074GD-A to the pressure switch (4) and tighten it with your hand plus one-eighth of a turn.

END OF POST SB RA32029-13

(3) Install the engine pump pressure switch.

POST SB RA32029-15 or POST SB RA32029-16

(a) Remove the COVER - BLANKING from the adapter (30), electrical connector 3074GD-A and the pressure switch (20).
(b) Apply Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) on the new AIPC 29-13-49-03-310 PACKING (25).
(c) Put the packing (25) on the pressure switch (20).
(d) Install the pressure switch (20) into the adapter (30).

NOTE: Use a second WRENCH - STANDARD to hold the adapter (30) when you torque the pressure switch (20).

(e) TORQUE the pressure switch (20) to between 405 and 380 lbf.in (4.58 and 4.29 m.daN )

.
(f) Attach the pressure switch (20) to the bracket with the clamp (15), the washer (10) and the bolt (5).
(g) TORQUE the bolt (5) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

(h) Do an electrical resistance check as follows:
1 Put one lead of the ohmmeter on the pressure switch (20).
2 Put the other lead of the ohmmeter on the adapter (30).
3 The resistance measured between the ohmmeter leads must be 0.0025 ohm or less.
(i) Install electrical connector 3074GD-A on the switch (20) and tighten with your hand plus one-eighth of a turn.

END OF POST SB RA32029-15 or POST SB RA32029-16

Subtask 29-13-17-865-055-A ** ON A/C NOT FOR ALL

B. 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 29-13-17-710-052-A ** ON A/C NOT FOR ALL

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

5. Close-up
Subtask 29-13-17-410-052-A ** ON A/C NOT FOR ALL

A. Close Access
(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.
(4) Close the left fan cowl door 447AL (Ref. AMM TASK 71-13-00-410-040).
(5) Close the door 195BB.

[Rev.10 from 2021] 2026.04.01 00:20:01 UTC