Removal of the Engine 1 Hydraulic Low-Pressure Switch Tube

TASK 29-11-49-000-044-A
Removal of the Engine 1 Hydraulic Low-Pressure Switch Tube

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.

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	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
Hydraulic Low Pressure Switch Tube
FOR [1000EM1] (ENGINE-1)
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors

3. Job Set-up
Subtask 29-11-49-860-071-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Depressurize the Green hydraulic system (Ref. AMM TASK 29-10-00-864-001).
(2) Depressurize the Green hydraulic reservoir (Ref. AMM TASK 29-14-00-614-001).
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system:

on the ground service panel 197CB.

(4) Put WARNING NOTICE(S) on the access door 195BB to tell persons not to pressurize the Green hydraulic reservoir.

Subtask 29-11-49-941-061-A ** ON A/C NOT FOR ALL

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

Put WARNING NOTICE(S) 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) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green 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) Put WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1(2).
(6) Put a CONTAINER 5 L (1.32 USGAL) below the suction-hose adapter connection to the hydraulic pump.

Subtask 29-11-49-010-061-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the left fan-cowl door:
(a) FOR [1000EM1] (ENGINE-1)
Open the door 437AL (Ref. AMM TASK 71-13-00-010-040).
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the engine.

4. Procedure
Subtask 29-11-49-020-058-A ** ON A/C NOT FOR ALL

A. Removal of the Hydraulic Low-Pressure Switch Tube
(1) Put a container below the hydraulic low-pressure switch tube (5) to catch the remaining fluid.
(2) Disconnect the low-pressure switch tube (5) from the pressure tube/hose and let the fluid drain into the container.

NOTE: Use a second wrench to hold the tee fitting on the pressure tube/hose when you loosen the coupling nut on the tube.

(3) Disconnect the low-pressure switch tube (5) from hydraulic low-pressure switch.

NOTE: Use a second wrench to hold the pressure switch when you loosen the coupling nut on the tube.

(4) Remove the low-pressure switch tube (5) from the engine.
(5) Put COVER - PROTECTION on the low pressure switch tube (5), the fitting on the pressure hose/tube, and the hydraulic low-pressure switch.
(6) Remove the container from the engine compartment.

[Rev.10 from 2021] 2026.04.01 00:16:50 UTC