W DOC AIRBUS | AMM A320F

Removal of the Engine-Pump Pressure Switch

TASK 29-11-17-000-803-A
Removal 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.
ZONE: 435
FIN: 1074GK
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 1M (3 FT)-ADJUSTABLE
No specific
AR
CAP - BLANKING
No specific
1
CONTAINER 20L (5 USGAL)
No specific
AR
PLUG - BLANKING
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WARNING NOTICE(S)
No specific
1
WRENCH - STANDARD
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
435
FAN AND ACCESSORY GEARBOX
195BB, 197CB
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
 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
TASK 71-13-00-010-803-A
Opening of the Fan Cowl Doors
F Engine-Pump Pressure Switch
3. Job Set-up
Subtask 29-11-17-860-067-A
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).
Subtask 29-11-17-941-063-A
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 the APU BLEED pushbutton switch.
   (2) Open access door 197CB.
     (a) On the ground service panel, put WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system.
   (3) On the HYD section of panel 40VU:
     (a) Put WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system.
   (4) Open access door 195BB.
     (a) Put WARNING NOTICE(S) in position to tell persons not to pressurize the reservoir of the Green hydraulic system.
   (5) On the center pedestal, on ENG panel 115VU:
  • Make sure that the ENG/MODE selector switch is in the NORM position.
  • Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
  • Put WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
   (6) On the ENG section of maintenance panel 50VU:
  • Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
  • Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 29-11-17-865-068-A
C. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUHYDRAULIC/G HYD/PUMP ENG1/CTL1701GKH12
121VUHYDRAULIC/G HYD/PUMP ENG1/MONG1702GKR33
Subtask 29-11-17-010-063-A
D. Get Access
   (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
   (2) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position at the engine.
4. Procedure
Subtask 29-11-17-020-063-A
A. Removal of the Engine-Pump Pressure Switch
CAUTION: USE TWO WRENCHES TO REMOVE OR INSTALL THE TUBE COUPLING NUTS:
  • ONE WRENCH TO HOLD THE UNION, AND
  • ONE TO LOOSEN OR TIGHTEN THE COUPLING NUT.
THIS PREVENTS DAMAGE TO THE PARTS.
   (1) Put a CONTAINER 20L (5 USGAL) below the pressure switch (3) to collect the remaining hydraulic fluid.
   (2) Disconnect the electrical connector (4) from the pressure switch (3).
   (3) Put CAP - BLANKING on the electrical connector (4).
   (4) Hold the pressure switch (3) with a WRENCH - STANDARD and disconnect the union of the hose (1).
   (5) Drain the hydraulic fluid from the hose (1) into the container.
   (6) Put the PLUG-BLANKING in each disconnected line end.
   (7) Remove the bolts (6) and clamp (5) that attach the pressure switch (3) to the bracket (2).
   (8) Remove the pressure switch (3).
   (9) Put CAP - BLANKING on the pressure switch (3).
[Rev.10 from 2021] 2026.04.01 00:14:42 UTC
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