DOC AIRBUS | AMM A320FVisually Examine the LP Turbine Stage 7 [IAE]
TASK 72-00-00-210-010-A
Visually Examine the LP Turbine Stage 7
1. Reason for the Job
This task gives the procedure for the visual inspection of the stage 7 Low Pressure (LP) turbine. A description of the types of damage that may be seen is given in 70-52-11, Definition of Damage.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 72-00-00-941-075-A ** ON A/C NOT FOR ALL
Subtask 72-00-00-210-076-A ** ON A/C NOT FOR ALL
Subtask 72-00-00-942-055-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:44:03 UTC
Visually Examine the LP Turbine Stage 7
1. Reason for the Job
This task gives the procedure for the visual inspection of the stage 7 Low Pressure (LP) turbine. A description of the types of damage that may be seen is given in 70-52-11, Definition of Damage.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 72-00-00-200-012-A | Borescope Inspection of the Low Pressure (LP) Turbine |
Stage 7 Turbine Blades - Lamp Inspection Acceptance LimitsSubtask 72-00-00-941-075-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 72-00-00-941-076-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. Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position to give access to the engine for inspection.
4. ProcedureSubtask 72-00-00-210-076-A ** ON A/C NOT FOR ALL
A. Examine the stage 7 turbine blades
and the stage 7 turbine vanes
(1) Examine for deposits
(a) Deposits related with usual engine running - Accept.
(b) Deposits not related with usual engine running, make a borescope inspection, (Ref. AMM TASK 72-00-00-200-012). If equivalent deposits are found at stage 3 blades, examine more other modules. If equivalent deposits are not found at stage 3, continue with examination of the LP turbine module.
(2) Examine the airfoil (area A5), the leading and the trailing edge (area A2 and A4) of the stage 7 turbine blades
and the stage 7 turbine vanes
for erosion
(a) If there is any erosion - Reject.
Subtask 72-00-00-210-077-A ** ON A/C NOT FOR ALL and the stage 7 turbine vanes
(1) Examine for deposits
(a) Deposits related with usual engine running - Accept.
(b) Deposits not related with usual engine running, make a borescope inspection, (Ref. AMM TASK 72-00-00-200-012). If equivalent deposits are found at stage 3 blades, examine more other modules. If equivalent deposits are not found at stage 3, continue with examination of the LP turbine module.
(2) Examine the airfoil (area A5), the leading and the trailing edge (area A2 and A4) of the stage 7 turbine blades
and the stage 7 turbine vanes
for erosion
(a) If there is any erosion - Reject.
B. Examine the stage 7 turbine blades
and the stage 7 turbine vanes
for FOD/BMOD damage (cracks, dents, nicks and other damages)
(1) Cracks on the tip and roof fillet (Area A1 and A3)
(a) If there are any cracks - Reject.
(2) Cracks on the leading and trailing edge (Area A2 and A4)
(a) If there are any cracks - Reject.
(3) Dents on the tip and roof fillet (Area A1 and A3)
(a) Smooth round bottomed dents of maximum 0.005 in. (0.13 mm) in depth - Accept.
(b) More than the limit above - Reject.
(4) Dents on the airfoil (Area A5)
(a) Smooth round bottomed dents of maximum 0.010 in. (0.25 mm) in depth - Accept.
(b) More than the limit above - Reject.
(5) Dents on the leading and trailing edge (Area A2 and A4)
(a) Smooth round bottomed dents of maximum 0.005 in. (0.13 mm) in depth - Accept.
(b) More than the limit above - Reject.
(6) Nicks on the airfoil (Area A5)
(a) Unblended nicks of maximum 0.010 in. (0.25 mm) in depth - Accept.
(b) More than the limit above - Reject.
(7) Nicks on the leading and trailing edge (Area A2 and A4)
(a) Unblended nicks of maximum 0.005 in. (0.13 mm) in depth - Accept.
(b) More than the limit above - Reject.
(8) Other damages on the tip and roof fillet (Area A1 and A3)
(a) Any other damage on the tip and roof fillet - Reject.
5. Close-upand the stage 7 turbine vanes
for FOD/BMOD damage (cracks, dents, nicks and other damages)
(1) Cracks on the tip and roof fillet (Area A1 and A3)
(a) If there are any cracks - Reject.
(2) Cracks on the leading and trailing edge (Area A2 and A4)
(a) If there are any cracks - Reject.
(3) Dents on the tip and roof fillet (Area A1 and A3)
(a) Smooth round bottomed dents of maximum 0.005 in. (0.13 mm) in depth - Accept.
(b) More than the limit above - Reject.
(4) Dents on the airfoil (Area A5)
(a) Smooth round bottomed dents of maximum 0.010 in. (0.25 mm) in depth - Accept.
(b) More than the limit above - Reject.
(5) Dents on the leading and trailing edge (Area A2 and A4)
(a) Smooth round bottomed dents of maximum 0.005 in. (0.13 mm) in depth - Accept.
(b) More than the limit above - Reject.
(6) Nicks on the airfoil (Area A5)
(a) Unblended nicks of maximum 0.010 in. (0.25 mm) in depth - Accept.
(b) More than the limit above - Reject.
(7) Nicks on the leading and trailing edge (Area A2 and A4)
(a) Unblended nicks of maximum 0.005 in. (0.13 mm) in depth - Accept.
(b) More than the limit above - Reject.
(8) Other damages on the tip and roof fillet (Area A1 and A3)
(a) Any other damage on the tip and roof fillet - Reject.
Subtask 72-00-00-942-055-A ** ON A/C NOT FOR ALL
A. Close-up
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).