DOC AIRBUS | AMM A320FInspection of the Turbine Exhaust Case [IAE]
TASK 72-50-00-200-010-A
Inspection of the Turbine Exhaust Case
This task gives the procedure for the inspection of the turbine exhaust struts and surrounding area without component removal.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 72-50-00-941-050-A ** ON A/C NOT FOR ALL
Subtask 72-50-00-220-051-A ** ON A/C NOT FOR ALL
Subtask 72-50-00-410-052-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 12:56:00 UTC
Inspection of the Turbine Exhaust Case
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobThis task gives the procedure for the inspection of the turbine exhaust struts and surrounding area without component removal.
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 | LIGHT SOURCE - INSPECTION |
| No specific | AR | MIRROR - INSPECTION |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V01-002) | cleaning fluid |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| 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 71-00-00-700-013-A | Procedure to Dry Out the High Pressure Turbine (HPT) after Oil Contamination |
| 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 72-50-00-300-010-A | Replacement of the Nut(s) on the Turbine Exhaust Case, Repair - VRS3019 |
| TASK 72-50-00-300-802-A | Replace the Helical Coil Insert or Repair with Oversized Inserts on the Turbine Exhaust Case, Repair - VRS3014 |
| 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 |
Weep Hole LocationSubtask 72-50-00-941-050-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 72-50-00-010-052-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 72-50-00-040-050-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 72-50-00-010-054-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 72-50-00-220-051-A ** ON A/C NOT FOR ALL
A. Visually Inspect the Turbine Exhaust Case Weep Hole and the No. 4 Bearing Weep Line:
(1) Examine the weep hole and weep line for oil wetting:
(a) If there is no oil wetting, continue to step B.
(b) If there is oil wetting, do the steps that follow:
1 If oil consumption is more than 0.3 U.S. Qts/h, remove the engine from service and perform inspection of the HPT after possible oil ignition event.
2 If oil consumption is in limits, do the procedure to dry out the high pressure turbine after oil contamination (Ref. AMM TASK 71-00-00-700-013):
b If the dry out is not successful, remove the engine from service and perform inspection of the HPT after possible oil ignition event.
Subtask 72-50-00-110-050-A ** ON A/C NOT FOR ALL (1) Examine the weep hole and weep line for oil wetting:
(a) If there is no oil wetting, continue to step B.
(b) If there is oil wetting, do the steps that follow:
1 If oil consumption is more than 0.3 U.S. Qts/h, remove the engine from service and perform inspection of the HPT after possible oil ignition event.
2 If oil consumption is in limits, do the procedure to dry out the high pressure turbine after oil contamination (Ref. AMM TASK 71-00-00-700-013):
NOTE: If the No. 4 bearing weep line has oil wetting, the oil leak has to be cleaned and the cause of the leak must be repaired before performing the procedure to dry out the high pressure turbine after oil contamination.
a If the dry out is successful, continue to step B. b If the dry out is not successful, remove the engine from service and perform inspection of the HPT after possible oil ignition event.
B. Clean the parts:
(1) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) , made moist with cleaning fluid (Material No.V01-002) , to clean the following parts:
(a) The internal surfaces of the turbine exhaust case.
(b) The external surfaces of the turbine exhaust case.
(c) The tubes of the turbine exhaust case.
(2) Make sure that the parts are free from soot, coke and wet oil.
(3) Dry the parts with a clean Textile-Lint free Cotton - (Material No.14SBA1) .
Subtask 72-50-00-210-050-A ** ON A/C NOT FOR ALL (1) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) , made moist with cleaning fluid (Material No.V01-002) , to clean the following parts:
(a) The internal surfaces of the turbine exhaust case.
(b) The external surfaces of the turbine exhaust case.
(c) The tubes of the turbine exhaust case.
(2) Make sure that the parts are free from soot, coke and wet oil.
(3) Dry the parts with a clean Textile-Lint free Cotton - (Material No.14SBA1) .
C. Visual Inspection of the Turbine Exhaust Case:
(1) Examine the struts on the internal surface of the turbine exhaust case, from the rear of the engine. Use the LIGHT SOURCE - INSPECTION and the MIRROR - INSPECTION.
(a) Damage on the leading and the trailing edges.
1 One distortion on each strut, with a maximum deflection of 1.00 in. (25.4 mm) radial length, accept it.
2 More than one distortion on a strut, or a deflection of more than 1.00 in. (25.4 mm) radial length, reject it.
(b) If a strut is cracked, reject it.
(2) Examine the external and internal surface of the turbine exhaust case.
(a) If it is cracked, reject it.
(b) If the stiffening rails are damaged, above and below the centerline, reject it.
(c) If the external surfaces and the turbine exhaust case gaspath surfaces including the inner/outer case walls and struts have corrosion, accept it. You can remove the corrosion with a wire brush or steel wool.
(3) Examine the oil pressure tube on the external surface of the turbine exhaust case.
(a) Examine the tube where it goes in to the insulation tube cover, if it is chafed, reject it.
(b) Examine the tube for security of attachment.
1 If the tube is loose, examine the attachment nuts, bolts and clips and the lockwire for damage, wear and loss of torque.
2 Reject items that are worn or damaged.
(4) Examine the oil scavenge tube on the external surface of the turbine exhaust case.
(a) Make sure that the oil scavenge tube is in the center of the insulation tube.
(b) If it is not in the center, loosen the securing bracket, put the tube in to the center of the insulation tube and tighten the securing bracket.
(c) Examine the tube for security of attachment :
1 If the tube is loose, examine the attachment nuts, bolts and clips and the lockwire for damage, wear and loss of torque.
2 Reject items that are worn or damaged.
(5) Examine the pressure control manifold on the external surface of the turbine exhaust case.
(a) If the manifold is damaged, reject it.
(b) Examine the manifold for security of attachment:
1 If the manifold is loose, examine these items for damage, wear and loss of torque:
(6) Examine the EGT thermocouple probe
(a) Examine the exposed surfaces of the thermocouple probe for cracks. If it is cracked, reject it.
(b) Examine the terminals for security of attachment and thread damage.
(7) Examine the nuts at the rear inner flange of the turbine exhaust case.
(a) Examine the nuts for looseness or damage.
1 If the nuts are damaged, loose, or missing, replace the nuts (Ref. AMM TASK 72-50-00-300-010).
(8) Examine the turbine case helicoils
(a) Examine the helicoils.
1 If the helicoils are loose, not there, or with internal thread damage, replace the helicoils (Ref. AMM TASK 72-50-00-300-802).
5. Close-up(1) Examine the struts on the internal surface of the turbine exhaust case, from the rear of the engine. Use the LIGHT SOURCE - INSPECTION and the MIRROR - INSPECTION.
(a) Damage on the leading and the trailing edges.
1 One distortion on each strut, with a maximum deflection of 1.00 in. (25.4 mm) radial length, accept it.
2 More than one distortion on a strut, or a deflection of more than 1.00 in. (25.4 mm) radial length, reject it.
(b) If a strut is cracked, reject it.
(2) Examine the external and internal surface of the turbine exhaust case.
(a) If it is cracked, reject it.
(b) If the stiffening rails are damaged, above and below the centerline, reject it.
(c) If the external surfaces and the turbine exhaust case gaspath surfaces including the inner/outer case walls and struts have corrosion, accept it. You can remove the corrosion with a wire brush or steel wool.
(3) Examine the oil pressure tube on the external surface of the turbine exhaust case.
(a) Examine the tube where it goes in to the insulation tube cover, if it is chafed, reject it.
(b) Examine the tube for security of attachment.
1 If the tube is loose, examine the attachment nuts, bolts and clips and the lockwire for damage, wear and loss of torque.
2 Reject items that are worn or damaged.
(4) Examine the oil scavenge tube on the external surface of the turbine exhaust case.
(a) Make sure that the oil scavenge tube is in the center of the insulation tube.
(b) If it is not in the center, loosen the securing bracket, put the tube in to the center of the insulation tube and tighten the securing bracket.
(c) Examine the tube for security of attachment :
1 If the tube is loose, examine the attachment nuts, bolts and clips and the lockwire for damage, wear and loss of torque.
2 Reject items that are worn or damaged.
(5) Examine the pressure control manifold on the external surface of the turbine exhaust case.
(a) If the manifold is damaged, reject it.
(b) Examine the manifold for security of attachment:
1 If the manifold is loose, examine these items for damage, wear and loss of torque:
- The attachment nuts, bolts and clips
- The lockwire
- The union nut and the tube end fitting.
(6) Examine the EGT thermocouple probe
(a) Examine the exposed surfaces of the thermocouple probe for cracks. If it is cracked, reject it.
(b) Examine the terminals for security of attachment and thread damage.
(7) Examine the nuts at the rear inner flange of the turbine exhaust case.
(a) Examine the nuts for looseness or damage.
1 If the nuts are damaged, loose, or missing, replace the nuts (Ref. AMM TASK 72-50-00-300-010).
(8) Examine the turbine case helicoils
(a) Examine the helicoils.
1 If the helicoils are loose, not there, or with internal thread damage, replace the helicoils (Ref. AMM TASK 72-50-00-300-802).
Subtask 72-50-00-410-052-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 72-50-00-440-050-A ** ON A/C NOT FOR ALL Subtask 72-50-00-410-054-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.