W DOC AIRBUS | AMM A320F

Installation of the Hydraulic Low-Pressure Switch Tube

TASK 29-11-49-400-005-A
Installation of the 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
1
ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific
AR
CONTAINER 5 L (1.32 USGAL)
No specific
3
COVER - PROTECTION
No specific
AR
WARNING NOTICE(S)
No specific
1
WRENCH - STANDARD
No specific
Torque wrench: range to between 20.35 and 17.85 lbf.ft (2.76 and 2.42 m.daN ) T
No specific
Torque wrench: range to between 34.51 and 30.09 lbf.in (0.39 and 0.34 m.daN ) T
No specific
Torque wrench: range to between 245 and 215 lbf.in (2.77 and 2.43 m.daN ) T
No specific
Torque wrench: range to between 315 and 300 lbf.in (3.56 and 3.39 m.daN ) T
No specific
Torque wrench: range to between 405 and 380 lbf.in (4.58 and 4.29 m.daN ) T
No specific
Torque wrench: range to between 0.39 and 0.34 m.daN (34.51 and 30.09 lbf.in ) T
No specific
Torque wrench: range to between 2.76 and 2.42 m.daN (20.35 and 17.85 lbf.ft ) T
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
195BB
FOR [1000EM1] (ENGINE-1)
437AL
 C. 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 29-10-00-864-001-A
Depressurize the Green Hydraulic System
TASK 29-11-00-710-001-A
Operational Test of the Green Hydraulic System
TASK 29-14-00-614-001-A
Depressurization of the Hydraulic Reservoirs
F Hydraulic Low-Pressure Switch Tube
F Hydraulic Low-Pressure Switch Hose/Tube Assembly
F Hydraulic Low-Pressure Switch Hose Assembly
FOR [1000EM1] (ENGINE-1)
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
3. Job Set-up
Subtask 29-11-49-860-074-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) Make sure that the Green 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 Green hydraulic system:
  • on the ground service panel 197CB.
   (4) Make sure that the WARNING NOTICE(S) is (are) in position on the access door 195BB to tell persons not to pressurize the Green hydraulic reservoir.
Subtask 29-11-49-941-072-A ** ON A/C NOT FOR ALL
B. Safety Precautions
   (1) On the center pedestal, on the 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 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 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) 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 low-pressure switch tube.
Subtask 29-11-49-010-072-A ** ON A/C NOT FOR ALL
C. Get Access
   (1) Make sure that the left fan cowl door is open:
     (a) FOR [1000EM1] (ENGINE-1)
make sure that the door 437AL is open (Ref. AMM TASK 71-13-00-010-040).
   (2) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position at the engine.
4. Procedure
Subtask 29-11-49-420-065-A ** ON A/C NOT FOR ALL
A. Installation of the Hydraulic Low-Pressure Switch Tube
F Hydraulic Low-Pressure Switch Tube ** ON A/C NOT FOR ALL

PRE SB RA32029-13

   (1) Remove the COVER - PROTECTION from the hydraulic low-pressure switch tube (15), the fitting on the pressure hose/tube and the hydraulic low-pressure switch.
   (2) Loosely connect the low-pressure switch tube (15) to the pressure hose/tube.
   (3) Loosely connect the low-pressure switch tube (15) to the hydraulic low-pressure switch.
   (4) Install the clamps (20), the washer (10) and the bolt (5) that attaches the low-pressure tube (15) to the top case drain hose/tube and to the channel. Do not tighten the bolt at this time.
   (5) Install the clamp (20), the washer (10) and the bolt (5) that attaches the low-pressure switch tube (15) to the bracket on the channel. Do not tighten the bolt at this time.
   (6) Make sure that the low-pressure switch tube (15) is in the correct position on the engine.
NOTE: Use a second WRENCH - STANDARD to hold the fittings when you torque the coupling nuts. This prevents damage to the tube assemblies.
   (7) TORQUE the coupling nut on the low-pressure switch (15) to between 405 and 380 lbf.in (4.58 and 4.29 m.daN ) T.
   (8) TORQUE the coupling nut on the pressure hose/tube to between 2.76 and 2.42 m.daN (20.35 and 17.85 lbf.ft ) T.
   (9) Torque the bolts (5) as follows:
CAUTION: YOU MUST TORQUE THE BOLTS IN THE SEQUENCE GIVEN. IF YOU DO NOT TORQUE THE BOLTS IN SEQUENCE, YOU CAN CAUSE DAMAGE TO THE LOW-PRESSURE SWITCH TUBE.
     (a) TORQUE the bolt (5) that attaches the low-pressure switch tube (15) to the top case drain hose/tube and to the channel to between 0.39 and 0.34 m.daN (34.51 and 30.09 lbf.in ) T.
     (b) TORQUE the bolt (5) that attaches the low-pressure switch tube (15) to the bracket on the channel to between 0.39 and 0.34 m.daN (34.51 and 30.09 lbf.in ) T.
   (10) Remove the container.

END OF PRE SB RA32029-13

Subtask 29-11-49-420-088-A ** ON A/C NOT FOR ALL
B. Installation of the Hydraulic Low-Pressure Switch Tube
F Hydraulic Low-Pressure Switch Hose/Tube Assembly ** ON A/C NOT FOR ALL

POST SB RA32029-13

   (1) Remove the COVER - PROTECTION from the hydraulic low-pressure switch hose/tube assembly (17), the fitting on the pressure hose/tube and the hydraulic low-pressure switch.
   (2) Loosely connect the low-pressure switch hose/tube assembly (17) to the pressure hose/tube.
   (3) Loosely connect the low-pressure switch hose/tube assembly (17) to the hydraulic low-pressure switch. Do not tighten the bolt at this time.
   (4) Install the clamp (20) on the low-pressure switch hose/tube assembly (17). Attach the low-pressure switch hose/tube assembly (17) to the channel with the bolt (7) and the washer (10). Do not tighten the bolts at this time.
   (5) Install the clamps (20) on the low-pressure switch hose/tube assembly (17). Attach the low-pressure switch hose/tube assembly (17) to the channel with the bolts (7), the washers (10), and the nuts (25). Do not tighten the bolts at this time.
   (6) Make sure that the low-pressure switch hose/tube assembly (17) is in the correct position on the engine.
NOTE: Use a second WRENCH - STANDARD to hold the fittings when you torque the coupling nuts. This prevents damage to the tube assemblies.
   (7) TORQUE the coupling nut on the low-pressure switch to between 405 and 380 lbf.in (4.58 and 4.29 m.daN ) T.
   (8) TORQUE the coupling nut on the pressure hose/tube to between 20.35 and 17.85 lbf.ft (2.76 and 2.42 m.daN ) T.
   (9) Torque the bolts (7) as follows:
CAUTION: YOU MUST TORQUE THE BOLTS IN THE SEQUENCE GIVEN. IF YOU DO NOT TORQUE THE BOLTS IN SEQUENCE, YOU CAN CAUSE DAMAGE TO THE LOW-PRESSURE SWITCH HOSE/TUBE ASSEMBLY.
     (a) TORQUE the bolt (7) on the side of the channel to between 34.51 and 30.09 lbf.in (0.39 and 0.34 m.daN ) T.
     (b) TORQUE the bolts (7) on the top of the channel to between 34.51 and 30.09 lbf.in (0.39 and 0.34 m.daN ) T.
   (10) Remove the container.

END OF POST SB RA32029-13

Subtask 29-11-49-420-118-A ** ON A/C NOT FOR ALL
C. Installation of the Hydraulic Low-Pressure Switch Tube
F Hydraulic Low-Pressure Switch Hose Assembly ** ON A/C NOT FOR ALL

POST SB RA32029-15

POST SB RA32029-16

   (1) Remove the COVER - PROTECTION from the hydraulic low-pressure switch hose assembly (19), the fitting on the pressure hose/tube and the hydraulic low-pressure switch.
   (2) Loosely connect the low-pressure switch hose assembly (19) to the pressure hose/tube.
   (3) Loosely connect the low-pressure switch hose assembly (19) to the hydraulic low-pressure switch. Do not tighten the bolt at this time.
   (4) Make sure that the low-pressure switch hose assembly (19) is in the correct position on the engine.
   (5) TORQUE the end fitting of the low pressure switch hose assembly (19) on the pressure hose/tube union to between 245 and 215 lbf.in (2.77 and 2.43 m.daN ) T.
NOTE: Use a second WRENCH - STANDARD to hold the union when you torque the end fitting. This prevents damage to the pressure hose/tube.
   (6) TORQUE the end fitting of the low pressure switch hose assembly (19) on the low-pressure switch adapter fitting union to between 315 and 300 lbf.in (3.56 and 3.39 m.daN ) T.
NOTE: Use a second WRENCH - STANDARD to hold the union when you torque the end fitting. This prevents damage to the adapter fitting.
   (7) Remove the container.

END OF POST SB RA32029-15

END OF POST SB RA32029-16

Subtask 29-11-49-710-062-A ** ON A/C NOT FOR ALL
D. Operational Test
   (1) Do an operational test of the Green hydraulic system (Ref. AMM TASK 29-11-00-710-001).
   (2) During the dry motoring of the engine 1, make sure that there are no leaks from the hydraulic low-pressure switch tube.
   (3) Make sure that the level of the hydraulic fluid in the Green 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 29-11-49-860-080-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
   (1) Remove the access platform(s).
   (2) Make sure that the work area is clean and clear of tools and other items.
Subtask 29-11-49-410-063-A ** ON A/C NOT FOR ALL
B. Close Access
   (1) Close the left fan cowl door:
     (a) FOR [1000EM1] (ENGINE-1)
close the door 437AL (Ref. AMM TASK 71-13-00-410-040).
   (2) Close the door 195BB.
Subtask 29-11-49-942-064-A ** ON A/C NOT FOR ALL
C. Safety Precautions
   (1) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.04.01 00:17:12 UTC
"Aviabrain" 2025