W DOC AIRBUS | AMM A320F

Installation of the Differential Pressure Indicator

TASK 29-14-41-400-803-A
Installation of the Differential Pressure Indicator

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
Torque wrench: range to between 23.0 and 21.3 lbf.in (0.26 and 0.24 m.daN ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.14CCB6)
Testing Medium-Leak Detection - Oxygen System
(Material No.14QFB1)
Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
191DB, 195BB
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 29-00-00-864-001-A
Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A
Depressurization of the Hydraulic Reservoirs
TASK 29-14-00-614-002-A
Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01
Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 29-14-00-720-001-A
Functional Test of the Pressurizing System of the Hydraulic Reservoirs
F Differential Pressure Indicator
3. Job Set-up
Subtask 29-14-41-860-069-A
A. Aircraft Maintenance Configuration
   (1) Make sure that the WARNING NOTICE(S) are in position to tell person not to pressurize Green, Blue and Yellow hydraulic systems:
  • In the cockpit on the hydraulic section 40VU of the overhead panel
  • On the ground service panel of the Green, Blue and Yellow hydraulic systems.
   (2) Make sure that the WARNING NOTICE(S) are in position to tell person not to pressurize the BLEED system:
  • In the cockpit on the AIR COND overhead panel 30VU
  • On the access door 191DB.
   (3) Make sure that the hydraulic systems are depressurized and put in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
   (4) Make sure that the reservoirs of the Green, Blue and Yellow hydraulic systems are depressurized.
(Ref. AMM TASK 29-14-00-614-001).
   (5) Make sure that the access panel 195BB is open.
Subtask 29-14-41-865-068-A
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUHYD/HYD PWR/B WARN/& CTL2702GJC12
** ON A/C NOT FOR ALL
49VUHYDRAULIC/G HYD/PUMP ENG1/CTL1701GKH12
** ON A/C NOT FOR ALL
121VUHYDRAULIC/G HYD/PUMP ENG1/CTL1701GKR35
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN30
121VUHYDRAULIC/G HYD/PUMP ENG1/MONG1702GKR34
** ON A/C ALL
121VUAPU/APU/CTL2KDL42
121VUAPU/ECB/SPLY1KDL41
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN31
121VUHYDRAULIC/G HYD/PUMP ENG1/MONG1702GKR33
** ON A/C ALL
123VUB HYD/ELEC PUMP2701GJAB09
123VUY HYD/ELEC/PUMP3802GXAB06
123VUY HYD/ELEC/ELEC PUMP/NORM3801GXAB03
4. Procedure
Subtask 29-14-41-420-057-A
A. Installation of the Differential Pressure indicator
F Differential Pressure Indicator
   (1) Clean the component interfaces and the adjacent area.
   (2) Do an inspection of the component interfaces and the adjacent area.
   (3) Install new packings (4) and (5) on the differential pressure indicator (2).
   (4) Put the differential pressure indicator (2) in the reservoir pressurization unit (1).
   (5) Loosely install the screws (3).
   (6) TORQUE the screws (3) to between 23.0 and 21.3 lbf.in (0.26 and 0.24 m.daN ) T.
WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
   (7) Safety the screws (3) with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
Subtask 29-14-41-865-069-A
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUHYD/HYD PWR/B WARN/& CTL2702GJC12
** ON A/C NOT FOR ALL
49VUHYDRAULIC/G HYD/PUMP ENG1/CTL1701GKH12
** ON A/C NOT FOR ALL
121VUHYDRAULIC/G HYD/PUMP ENG1/CTL1701GKR35
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN30
121VUHYDRAULIC/G HYD/PUMP ENG1/MONG1702GKR34
** ON A/C ALL
121VUAPU/APU/CTL2KDL42
121VUAPU/ECB/SPLY1KDL41
** ON A/C NOT FOR ALL
121VUHYDRAULIC/HYD POWER/Y3803GXN31
121VUHYDRAULIC/G HYD/PUMP ENG1/MONG1702GKR33
** ON A/C ALL
123VUB HYD/ELEC PUMP2701GJAB09
123VUY HYD/ELEC/PUMP3802GXAB06
123VUY HYD/ELEC/ELEC PUMP/NORM3801GXAB03
Subtask 29-14-41-710-056-A
C. Leak test
   (1) Do an functional test of the reservoir pressurization unit (Ref. AMM TASK 29-14-00-720-001).
   (2) Apply the Testing Medium-Leak Detection - Oxygen System (Material No.14CCB6) to the connection area of the differential pressure indicator (2) and the reservoir pressurization unit. Make sure that there is no leakage.
5. Close-up
Subtask 29-14-41-860-070-A
A. Put the aircraft back to its initial configuration.
   (1) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
   (2) Make sure that hydraulic reservoirs are pressurized (Ref. AMM TASK 29-14-00-614-002).
   (3) Make sure that the work area is clean and clear of tools and other items.
Subtask 29-14-41-410-056-A
B. Close Access
   (1) Close access panel 195BB.
Subtask 29-14-41-942-054-A
C. Put the aircraft back to its initial configuration.
   (1) Remove the WARNING NOTICE(S) from the cockpit, ground service panel and access panel 191DB.
[Rev.10 from 2021] 2026.04.01 07:54:34 UTC
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