DOC AIRBUS | AMM A320FInspection of the Low Pressure Turbine Active Clearance Control System (LPTACC) [IAE]
TASK 75-24-49-200-010-B
Inspection of the Low Pressure Turbine Active Clearance Control System (LPTACC)
1. Reason for the Job
This task gives the procedure for the inspection of the LP Active Clearance Control (ACC) System.
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 75-24-49-941-056-A ** ON A/C NOT FOR ALL
Subtask 75-24-49-210-053-A ** ON A/C NOT FOR ALL
Subtask 75-24-49-410-055-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:11:32 UTC
Inspection of the Low Pressure Turbine Active Clearance Control System (LPTACC)
1. Reason for the Job
This task gives the procedure for the inspection of the LP Active Clearance Control (ACC) System.
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 | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 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 71-13-00-410-010-A | Closing 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 78-30-00-440-012-A | Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance |
| TASK 78-32-00-010-010-A | Opening of the Thrust Reverser Halves |
| TASK 78-32-00-410-010-A | Closing of the Thrust Reverser Halves |
Subtask 75-24-49-941-056-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 75-24-49-010-056-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 to give access to the engine for inspection.
Subtask 75-24-49-040-055-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 to give access to the engine for inspection.
C. Deactivate the Thrust Reverser
Subtask 75-24-49-010-062-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 75-24-49-210-053-A ** ON A/C NOT FOR ALL
A. Examine the Clamps, the Periseal Housings, the Tube Connector and the Periseal Housing Retaining Clamps
LPTACC, Clamps, Periseal Housing, Periseal Housing Retaining Clamps and Connector Tubes ** ON A/C NOT FOR ALL
PRE SB 75-0051
(1) Visually examine the clamps and the periseal housings.
(a) If they are cracked, reject them.
(b) If they are badly dammaged so as to function unsatisfactorily, reject them.
(2) Visually examine the tube connector.
(a) If it is cracked, reject it.
(b) If it is dented or nicked so as to cause a break in the tube, reject it.
(3) Examine the retaining clamps.
(a) If they are bent but function satisfactorily, accept them.
(b) If they are broken or loose, reject them.
Subtask 75-24-49-210-059-A ** ON A/C NOT FOR ALL LPTACC, Clamps, Periseal Housing, Periseal Housing Retaining Clamps and Connector Tubes ** ON A/C NOT FOR ALL PRE SB 75-0051
(1) Visually examine the clamps and the periseal housings.
(a) If they are cracked, reject them.
(b) If they are badly dammaged so as to function unsatisfactorily, reject them.
(2) Visually examine the tube connector.
(a) If it is cracked, reject it.
(b) If it is dented or nicked so as to cause a break in the tube, reject it.
(3) Examine the retaining clamps.
(a) If they are bent but function satisfactorily, accept them.
(b) If they are broken or loose, reject them.
B. Examine the Clamps, the Periseal Housings, the Tube Connector and the Periseal Connector Retaining Clamps
SBE 75-0051: LP Turbine ACC Connector (T-piece) as precision casting
(1) Visually examine the clamps and the periseal housings.
(a) If they are cracked, reject them.
(b) If they are badly dammaged so as to function unsatisfactory, reject them.
(2) Visually examine the tube connector.
(a) If it is cracked, reject it.
(b) If it is dented or nicked so as to cause a break in the tube, reject it.
(3) Examine the retaining clamps.
(a) If they are bent but function satisfactorily, accept them.
(b) If they are broken or loose, reject them.
Subtask 75-24-49-220-051-A ** ON A/C NOT FOR ALL SBE 75-0051: LP Turbine ACC Connector (T-piece) as precision casting
(1) Visually examine the clamps and the periseal housings.
(a) If they are cracked, reject them.
(b) If they are badly dammaged so as to function unsatisfactory, reject them.
(2) Visually examine the tube connector.
(a) If it is cracked, reject it.
(b) If it is dented or nicked so as to cause a break in the tube, reject it.
(3) Examine the retaining clamps.
(a) If they are bent but function satisfactorily, accept them.
(b) If they are broken or loose, reject them.
C. Examine the LPT cooling air duct support and half loop clamps
(1) Visually examine the support
(a) Cracks up to 0.196 in. (5.0 mm) length, accept it.
(b) A maximum of five cracks on each support, accept it.
(c) Cracks more than 0.196 in. (5.0 mm) length, reject it.
(d) More than five cracks on a support, reject it.
(e) If a support is loose, reject it.
(2) Visually examine the half loop clamp
(a) If it is cracked, reject it.
Subtask 75-24-49-210-054-A ** ON A/C NOT FOR ALL (1) Visually examine the support
(a) Cracks up to 0.196 in. (5.0 mm) length, accept it.
(b) A maximum of five cracks on each support, accept it.
(c) Cracks more than 0.196 in. (5.0 mm) length, reject it.
(d) More than five cracks on a support, reject it.
(e) If a support is loose, reject it.
(2) Visually examine the half loop clamp
(a) If it is cracked, reject it.
D. Examine the LPT Cooling Air Duct Assembly
(1) Examine the cooling air duct assemblies for cracks, dents, nicks and loose mountings
(a) If the tubes or the housing are cracked, reject it.
(b) If there are dents or nicks that cause a break in the tubes or the housing, reject it
(c) If it has loose mountings caused by defective rivets, reject it.
(d) If a bracket is cracked, reject it
LPTACC, Clamps, Periseal Housing, Periseal Housing Retaining Clamps and Connector Tubes ** ON A/C NOT FOR ALL
5. Close-up(1) Examine the cooling air duct assemblies for cracks, dents, nicks and loose mountings
(a) If the tubes or the housing are cracked, reject it.
(b) If there are dents or nicks that cause a break in the tubes or the housing, reject it
(c) If it has loose mountings caused by defective rivets, reject it.
(d) If a bracket is cracked, reject it
LPTACC, Clamps, Periseal Housing, Periseal Housing Retaining Clamps and Connector Tubes ** ON A/C NOT FOR ALL Subtask 75-24-49-410-055-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 75-24-49-440-053-A ** ON A/C NOT FOR ALL Subtask 75-24-49-410-059-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR