Preliminary Requirements

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURER'S MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS. THESE CONTAIN INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

Procedure

1. SUBTASK 70-33-90-300-001 Remove the IAE 53-5 Plasma Spray Chromium Carbide

   1. 

      CAUTION

      THIS PROCEDURE DOES NOT APPLY TO PARTS IN WHICH THE CLEANING SOLUTIONS CAN GET CAUGHT WITHOUT THE POSSIBILITY TO CORRECTLY FLUSH THE CHEMICAL OUT.

      

      CAUTION

      DO NOT USE ON PARTS FOR WHICH IMMERSION IS NOT PERMITTED IN THE ENGINE MANUAL CLEANING SECTION.

      Use the Step Method 1 procedure or the Step Method 2 procedure to strip the part.

2. SUBTASK 70-33-90-330-100 Method 1 Multi-Step Heavy Duty Cleaning And Descaling Procedure

   1. Go to Step.

3. SUBTASK 70-33-90-330-101 Oxide Removal Abrasive Blast (Method 1)

   1. Abrasive blast the area to be stripped to remove oxides. Refer to SPM TASK 70-12-09-120-501.

      1. 

         CAUTION

         IF YOU USE SPM TASK 70-12-06-120-501 WET ABRASIVE BLAST ON A HOLLOW AIRFOIL, AIR-COOLED AIRFOIL OR OTHER AIR-COOLED TURBINE PART (SUCH AS A DUCT SEGMENT), OPENINGS IN THE PART WILL BECOME CLOGGED WITH THE SLURRY, WHICH WILL CAUSE AIRFLOW THROUGH THE PART TO BE NOT SUFFICIENT DURING ENGINE OPERATION AND SUBSEQUENTLY CAUSE FAILURE OF THE PART.

         For parts other than hollow airfoils, air-cooled airfoils and other air-cooled turbine parts (such as duct segments), it is permitted to use SPM TASK 70-12-06-120-501 as an alternative to SPM TASK 70-12-09-120-501 to remove the oxides.

   2. Go to Step.

4. SUBTASK 70-33-90-330-102 Procedure To Remove The IAE 53-5 Plasma Coat (Method 1)

   1. Send the part through the SPM TASK 70-11-54-300-503 procedure. It can be necessary to keep the part in each solution for the maximum amount of time to sufficiently loosen the IAE 53-5 coating.

   2. Use one of the procedures in the subsequent list to remove the plasma coating:

      1. Dry abrasive grit blast the part. Refer to SPM TASK 70-12-09-120-501.

         1. 

            CAUTION

            IF YOU USE SPM TASK 70-12-06-120-501 WET ABRASIVE BLAST ON A HOLLOW AIRFOIL, AIR-COOLED AIRFOIL OR OTHER AIR-COOLED TURBINE PART (SUCH AS A DUCT SEGMENT), OPENINGS IN THE PART WILL BECOME CLOGGED WITH THE SLURRY, WHICH WILL CAUSE AIRFLOW THROUGH THE PART TO BE NOT SUFFICIENT DURING ENGINE OPERATION AND SUBSEQUENTLY CAUSE FAILURE OF THE PART.

            For parts other than hollow airfoils, air-cooled airfoils and other air-cooled turbine parts (such as duct segments), it is permitted to use SPM TASK 70-12-06-120-501 as an alternative to SPM TASK 70-12-09-120-501 to remove the IAE 53-5 coating.

      2. Use a high-pressure water spray unit to remove the plasma coating. Refer to TASK 70-10-00-100-501 General Cleaning Information For The Engine Components During Maintenance.

   3. Do an inspection for coating removal.

      1. If there is remaining coating, do the Step procedure again, but the total time in the acid scale conditioner solution must not be more than 7 hours.

5. SUBTASK 70-33-90-330-200 Method 2 Acid And Alkaline Permanganate Procedure

   1. Go to Step.

6. SUBTASK 70-33-90-330-201 Oxide Removal Abrasive Blast (Method 2)

   1. Abrasive blast the area to be stripped to remove oxides. Refer to TASK 70-12-09-120-501.

      1. 

         CAUTION

         IF YOU USE SPM TASK 70-12-06-120-501 WET ABRASIVE BLAST ON A HOLLOW AIRFOIL, AIR-COOLED AIRFOIL OR OTHER AIR-COOLED TURBINE PART (SUCH AS A DUCT SEGMENT), OPENINGS IN THE PART WILL BECOME CLOGGED WITH THE SLURRY, WHICH WILL CAUSE AIRFLOW THROUGH THE PART TO BE NOT SUFFICIENT DURING ENGINE OPERATION AND SUBSEQUENTLY CAUSE FAILURE OF THE PART.

         For parts other than hollow airfoils, air-cooled airfoils and other air-cooled turbine parts (such as duct segments), it is permitted to use SPM TASK 70-12-06-120-501 as an alternative to SPM TASK 70-12-09-120-501 to remove the oxides.

   2. Go to Step.

7. SUBTASK 70-33-90-330-202 Acid And Alkaline Permanganate Soak (Method 2)

   1. Put the part fully in Solution Code 118 nitric/inhibited phosphoric acid solution for 30 to 60 minutes at 160 deg F to 180 deg F (71 deg C to 82 deg C). Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-002.

      NOTE

      The acid solution does not change the IAE 53-5 plasma spray coating to a black smut.

   2. Flush fully in cold running water.

   3. Put the part fully into one of these alkaline permanganate solutions for 1-2 hours at 190 deg F to 200 deg F (88 deg C to 93 deg C):

      NOTE

      The alkaline permanganate solution changes the IAE 53-5 plasma spray coating to a black smut.

      1. Solution Code 140 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-005.

      2. Solution Code 100 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-006.

      3. Solution Code 161 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-009.

      4. Solution Code 168 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-010.

      5. Solution Code 162 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-011.

   4. Flush fully in cold running water.

   5. If the alkaline permanganate solution did not cause a black smut on the part, do the subsequent procedure:

      1. If the part is in the second cycle or a subsequent cycle through Step Method 2 Acid And Alkaline Permanganate Procedure during the same shop visit, then go to Step.

      2. Do a check to make sure that the acid solution and the alkaline permanganate solution are at the correct temperature and concentration and that the solution agitation operates correctly.

         1. If one or more of these conditions is not correct, do the subsequent procedure:

            1. If the solution agitation is not correct, adjust the agitation.

            2. If the solution temperature is not correct, adjust the temperature.

            3. If the solution concentration is not correct, do the applicable solution maintenance. Refer to SPM TASK 70-33-90-200-502 Test And Control Of The Solutions To Strip IAE 53-5 Plasma Spray Chromium Carbide (Method M).

         2. If all of these conditions are correct, do the subsequent procedure:

            1. Discard the alkaline permanganate solution.

            2. Clean the alkaline permanganate solution tank.

            3. Make up a new alkaline permanganate solution.

      3. Put the part fully in SPS 131 stripping solution for 30 - 60 minutes at 160 deg F - 180 deg F (71 deg C - 82 deg C).

      4. Flush fully in cold running water.

      5. Put the part fully in one of these alkaline permanganate solution for 1 - 2 hours at 190 deg F - 200 deg F (88 deg C - 93 deg C):

         1. Solution Code 140 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-005.

         2. Solution Code 100 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-006.

         3. Solution Code 161 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-009.

         4. Solution Code 168 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-010.

         5. Solution Code 162 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-011.

      6. Flush fully in cold running water.

      7. If the plasma coating did not change to a black smut, contact IAE for assistance.

   6. Pressure spray rinse to remove loose smut.

   7. Go to Step.

8. SUBTASK 70-33-90-330-203 Smut Removal (Method 2)

   1. Put the part in one of these alkaline permanganate solutions for 10 to 15 minutes at 190 deg F to 200 deg F (88 deg C to 93 deg C):

      1. Solution Code 140 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-005.

      2. Solution Code 100 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-006.

      3. Solution Code 161 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-009.

      4. Solution Code 168 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-010.

      5. Solution Code 162 alkaline permanganate solution. Refer to SPM TASK 70-33-90-100-501, SUBTASK 70-33-90-100-011.

   2. Flush fully in cold running water.

   3. Do an inspection for coating removal. A black smut will show in those areas that have coating remaining.

      1. If no black smut shows on the part, go to Step.

      2. Do one of the procedures in the subsequent list to remove all black smut:

         1. Abrasive blast to remove all black smut. Refer to SPM TASK 70-12-09-120-501.

            1. 

               CAUTION

               IF YOU USE SPM TASK 70-12-06-120-501 WET ABRASIVE BLAST ON A HOLLOW AIRFOIL, AIR-COOLED AIRFOIL OR OTHER AIR-COOLED TURBINE PART (SUCH AS A DUCT SEGMENT), OPENINGS IN THE PART WILL BECOME CLOGGED WITH THE SLURRY, WHICH WILL CAUSE AIRFLOW THROUGH THE PART TO BE NOT SUFFICIENT DURING ENGINE OPERATION AND SUBSEQUENTLY CAUSE FAILURE OF THE PART.

               For parts other than hollow airfoils, air-cooled airfoils and other air-cooled turbine parts (such as duct segments), it is permitted to use SPM TASK 70-12-06-120-501 as an alternative to SPM TASK 70-12-09-120-501 to remove the black smut.

         2. Use a high-pressure water spray unit to remove all black smut. Refer to SPM TASK 70-10-00-100-501.

            NOTE

            Compared to the abrasive blast smut removal procedure, the high-pressure water spray can keep to a minimum the erosion of part base metal from areas where there is no remaining IAE 53-5 coating to give protection to the part base metal from the removal procedure.

         3. Do Step and then Step again until the alkaline permanganate solution does not cause black smut on the part. Do not let the part stay in the nitric/inhibited phosphoric acid solution for more than 7 hours total and do not let the alkaline permanganate solution for more than 14 hours.

   4. Go to Step.

9. SUBTASK 70-33-90-330-204 Permanganate Stain Removal (Method 2)

   1. Abrasive blast to remove permanganate. Refer to SPM TASK 70-12-09-120-501.

      1. 

         CAUTION

         IF YOU USE SPM TASK 70-12-06-120-501 WET ABRASIVE BLAST ON A HOLLOW AIRFOIL, AIR-COOLED AIRFOIL OR OTHER AIR-COOLED TURBINE PART (SUCH AS A DUCT SEGMENT), OPENINGS IN THE PART WILL BECOME CLOGGED WITH THE SLURRY, WHICH WILL CAUSE AIRFLOW THROUGH THE PART TO BE NOT SUFFICIENT DURING ENGINE OPERATION AND SUBSEQUENTLY CAUSE FAILURE OF THE PART.

         For parts other than hollow airfoils, air-cooled airfoils and other air-cooled turbine parts (such as duct segments), it is permitted to use SPM TASK 70-12-06-120-501 as an alternative to SPM TASK 70-12-09-120-501 to remove the permanganate stains.