Removal of the Engine-Pump Pressure Switch

TASK 29-11-17-000-802-A
Removal of the Engine-Pump Pressure Switch

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

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.

ZONE: 470
FIN: 1074GK ** 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	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	1	CONTAINER 20L (5 USGAL)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - CROWFOOT
98D27803000000	1	LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
470	ENGINE 1 AFT PYLON
195BB, 197CB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 27-00-00-480-002-A	Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
TASK 27-50-00-866-009-A	Retraction of the Flaps on the Ground
TASK 27-50-00-866-009-A-01	Retraction of the Flaps/Slats on the Ground
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 54-54-00-000-802-A	Removal of the Rear Pylon Fairing (RPF)
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
Engine-Pump Pressure Switch

3. Job Set-up
Subtask 29-11-17-860-065-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the Green hydraulic system is depressurized
(Ref. AMM TASK 29-10-00-864-001)
(2) Depressurize the reservoir of the Green hydraulic system
(Ref. AMM TASK 29-14-00-614-001)
(3) Make sure that the flaps are in the fully retracted position (Ref. AMM TASK 27-50-00-866-009).

Subtask 29-11-17-941-060-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On AIR COND panel 30VU:

Make sure that the APU BLEED pushbutton switch is released (ON legend off).
Put a WARNING NOTICE(S) in position to tell persons not to operate this pushbutton switch.

(2) Open access door 197CB.
(3) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system:

On the HYD section of panel 40VU
On the ground-service panel of the Green hydraulic system.

(4) Open access door 195BB:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the reservoir of the Green hydraulic system.
(5) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
(6) On FLAPS panel 114VU:

Install the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION on the flap/slat control lever (Ref. AMM TASK 27-00-00-480-002).
Put a WARNING NOTICE(S) on the flap/slat control lever to tell persons not to operate the flap/slat controls.

Subtask 29-11-17-865-065-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33

Subtask 29-11-17-020-060-A ** ON A/C NOT FOR ALL

D. Remove the rear pylon fairing (Ref. AMM TASK 54-54-00-000-802).

Subtask 29-11-17-010-061-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the rear pylon.

4. Procedure
Subtask 29-11-17-020-059-A ** ON A/C NOT FOR ALL

A. Removal of the Engine-Pump Pressure Switch
(1) Put a CONTAINER 20L (5 USGAL) below the pressure switch to collect the remaining fluid.
(2) Disconnect the electrical connector (1) from the pressure switch (2).
(3) Put CAP - BLANKING on the electrical connector (1).
(4) At the pressure-switch port of the manifold (4), install a WRENCH - CROWFOOT on the flats to hold the manifold (4)
(5) Remove the pressure switch (2).
(6) Remove and discard the packing (3).
(7) Put CAP - BLANKING on the pressure switch (2) and to the pressure-switch port of the manifold (4).

[Rev.10 from 2021] 2026.04.01 07:56:39 UTC