DOC AIRBUS | AMM A320FRemoval of the Diffuser Case Tubes Seal Rings from an Assembled Engine [IAE]
TASK 72-42-10-000-001-A
Removal of the Diffuser Case Tubes Seal Rings from an Assembled Engine
1. Reason for the Job
This removal task gives the procedure to remove the seal rings from some of the tubes that come out of the diffuser case.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 72-42-10-941-050-A ** ON A/C NOT FOR ALL
Subtask 72-42-10-020-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:46:21 UTC
Removal of the Diffuser Case Tubes Seal Rings from an Assembled Engine
1. Reason for the Job
This removal task gives the procedure to remove the seal rings from some of the tubes that come out of the diffuser case.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | CAP - BLANKING |
| No specific | AR | CONTAINER - CLEAN, APPLICABLE |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 78-30-00-040-012-A | Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance |
| TASK 78-32-00-010-010-A | Opening of the Thrust Reverser Halves |
Subtask 72-42-10-941-050-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) 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) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 72-42-10-010-050-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) 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) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 72-42-10-040-050-A ** ON A/C NOT FOR ALL (1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
C. Deactivate the thrust reverser
Subtask 72-42-10-010-051-A ** ON A/C NOT FOR ALL WARNING:
MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(1) Deactivate the thrust reverser hydraulic-control-unit (HCU) (Ref. AMM TASK 78-30-00-040-012). D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 72-42-10-020-050-A ** ON A/C NOT FOR ALL
A. Removal of the Diffuser Case Tubes Seal Rings
(1) Put a CONTAINER - CLEAN, APPLICABLE below the No. 4 bearing oil pressure tube to catch the drained oil.
(2) Disconnect the No. 4 bearing oil pressure tube at approximately the seven o'clock position on the diffuser case to gain access to the seal rings on the outer end of the tube.
(a) Removal of the lockwire
(b) Disconnect the coupling nut (6) on the No. 4 bearing oil pressure tube.
(c) Remove the thrust wire (5) and the coupling nut (6) from the outer end of the No. 4 bearing oil pressure tube.
(d) Discard the thrust wire (5).
(e) Remove the bolts (7), the retaining plate (4) the sealing sleeve (3) and the gasket (2) from over the outer end of the pressure tube.
(f) Discard the gasket (2).
(g) Remove the two seal rings (1), from the grooves on the outer end of the tube.
PRE SBE 72-0116
(3) Disconnect the turbine cooling air duct airframe sensing tube at approximately the one o'clock position on the diffuser case to gain access to the seal rings on the outer end of the tube.
Remove the Turbine Cooling Air Duct Airframe Sensing Tube Seal Rings (PRE SBE 72-0166) ** ON A/C NOT FOR ALL
(b) Remove the nut assembly (1) from the tube union (9).
(c) Remove the tube union (9) from the coupling nut (2).
(d) Remove the thrust wire (3) and the coupling nut (2) from the outer end of the turbine air duct sensing tube.
(e) Discard the thrust wire (3).
(f) Remove the bolts (8), the retaining plate (4) the sealing sleeve (5) and the gasket (7) from the boss on the OD of the case.
(g) Discard the gasket (7).
(h) Remove the seal rings.
END OF SBE 72-0166
(4) Disconnect the No. 4 bearing airframe tube at approximately the six o'clock position on the diffuser case to gain access to the seal rings on the outer end of the tube.
(a) Removal of the lockwire
(b) Disconnect the A/O No. 4 oil weep tube (6) from the coupling nut (8).
(c) Remove the thrust wire (7) and the coupling nut (8), from the outer end of the No. 4 bearing airframe tube.
(d) Discard the thrust wire (7).
(e) Remove the bolts (5), the retaining plate (4) the sealing sleeve (3) and the gasket (2) from the boss on the OD of the case.
(f) Discard the gasket (2).
(g) Remove the two seal rings (17), from the grooves from the outer end of the tube.
(5) Remove the container and discard the drained oil.
(6) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(1) Put a CONTAINER - CLEAN, APPLICABLE below the No. 4 bearing oil pressure tube to catch the drained oil.
(2) Disconnect the No. 4 bearing oil pressure tube at approximately the seven o'clock position on the diffuser case to gain access to the seal rings on the outer end of the tube.
(a) Removal of the lockwire
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.
1 Remove the lockwire which safeties the oil feed tube (8) to the thrust wire (5) and tube nut (6) on the No. 4 bearing pressure tube at the diffuser case. (b) Disconnect the coupling nut (6) on the No. 4 bearing oil pressure tube.
(c) Remove the thrust wire (5) and the coupling nut (6) from the outer end of the No. 4 bearing oil pressure tube.
(d) Discard the thrust wire (5).
(e) Remove the bolts (7), the retaining plate (4) the sealing sleeve (3) and the gasket (2) from over the outer end of the pressure tube.
(f) Discard the gasket (2).
(g) Remove the two seal rings (1), from the grooves on the outer end of the tube.
PRE SBE 72-0116
(3) Disconnect the turbine cooling air duct airframe sensing tube at approximately the one o'clock position on the diffuser case to gain access to the seal rings on the outer end of the tube.
Remove the Turbine Cooling Air Duct Airframe Sensing Tube Seal Rings (PRE SBE 72-0166) ** ON A/C NOT FOR ALL NOTE: The tube is not required to SBE 72-0166.
(a) Removal of the lockwire 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.
1 Remove the lockwire which safeties the nut assembly (1), tube union (9) coupling nut (2) and thrust wire (3) on the turbine cooling air duct sensing tube. (b) Remove the nut assembly (1) from the tube union (9).
(c) Remove the tube union (9) from the coupling nut (2).
(d) Remove the thrust wire (3) and the coupling nut (2) from the outer end of the turbine air duct sensing tube.
(e) Discard the thrust wire (3).
(f) Remove the bolts (8), the retaining plate (4) the sealing sleeve (5) and the gasket (7) from the boss on the OD of the case.
(g) Discard the gasket (7).
(h) Remove the seal rings.
CAUTION:
TAKE PRECAUTIONS TO PREVENT THAT THE SEAL RINGS DO NOT FALL INTO THE ENGINE.
1 Remove the two seal rings (6), from the grooves on the outer end of the tube. END OF SBE 72-0166
(4) Disconnect the No. 4 bearing airframe tube at approximately the six o'clock position on the diffuser case to gain access to the seal rings on the outer end of the tube.
(a) Removal of the lockwire
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.
1 Remove the lockwire from the A/O No. 4 oil weep tube (6) thrust wire (7) and No. 4 bearing airframe tube coupling nut (8). (b) Disconnect the A/O No. 4 oil weep tube (6) from the coupling nut (8).
(c) Remove the thrust wire (7) and the coupling nut (8), from the outer end of the No. 4 bearing airframe tube.
(d) Discard the thrust wire (7).
(e) Remove the bolts (5), the retaining plate (4) the sealing sleeve (3) and the gasket (2) from the boss on the OD of the case.
(f) Discard the gasket (2).
(g) Remove the two seal rings (17), from the grooves from the outer end of the tube.
(5) Remove the container and discard the drained oil.
(6) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.