Preliminary Requirements

Procedure

1. SUBTASK 72-45-24-350-085 Remove the Cover from the Vane Assembly

   1. Remove the cover from the vane.

      1. Refer to Figure. Remove the minimum material necessary from the vane surface so you do not open the plug welded vane cavity hole.

   2. NOTE

      If you open the vane cavity hole, you can prepare and weld the hole with CoMat 03-287 WELDING FILLER WIRE and the manual gas tungsten arc method.

2. SUBTASK 72-45-24-110-057 Clean the Vane Assembly

   1. Clean the vane.

      1. Do the procedure given in the SPM TASK 70-11-03-300-503. You can also clean the vane in a furnace that is at 1250 to 1350 deg F (677 to 732 deg C) for a minimum of five minutes with a minimum of 10 minutes above 1000 deg F (537.8 deg C). The time above 1000 deg F (537.8 deg C) must not be more than 60 minutes. If you clean the vane in a furnace, you must also do an abrasive clean.

3. SUBTASK 72-45-24-310-054-001 Install the Replacement Cover by Brazing

   NOTE

   You can braze the cover and the honeycomb at the same time. Refer to Repair, VRS3223 TASK 72-45-24-300-006 (REPAIR-006).

   1. Position the cover on center on the vane.

      1. Refer to Figure or Figure.

   2. Braze the cover to the vane.

      1. Do the procedure given in the SPM TASK 70-31-16-310-501. Braze the cover at 1950 to 2000 deg F (1066 to 1093 deg C).

         Use CoMat 03-151 HIGH TEMP. BRAZING FILLERPOWDERCoMat 03-152 BRAZING FILLER POWDERCoMat 03-154 BRAZING FILLER POWDER. Nickel plate can be omitted if brazed in a vacuum. If you do not braze in a vacuum, nickel plate the area to be brazed by the procedure given in the SPM TASK 70-33-06-300-503. You can tack weld the cover with CoMat 03-287 WELDING FILLER WIRE before you braze it. A minimum of 30 percent joining is required, with the line of braze requirement waived.

   3. NOTE

      Local braze with the manual plasma arc or gas tungsten arc torch method and the initial braze alloy type wire is acceptable. Two braze cycles are permitted.

4. SUBTASK 72-45-24-310-054-002 Install the Replacement Cover by Welding

   1. Position the cover on center on the vane.

      1. Refer to Figure or Figure.

   2. Weld the cover to the vane.

      1. Do the procedure given in the SPM TASK 70-31-13-310-501. Weld the cover with the manual gas tungsten arc or laser beam method. You can use CoMat 03-287 WELDING FILLER WIRE. You can tack weld the cover to align it.

5. SUBTASK 72-45-24-220-123 Examine the Repaired Area

   NOTE

   This procedure is an alternative to Step.

   1. Visually inspect the repaired area.

      1. Refer to Figure.

         Use a magnifying glass. Discontinuites that are in 0.015in. (0.381 mm) or less, random or in clusters, are permitted if they are not in linear alignment. Six discontinuites that are porosity, voids or shrinkage and are 0.030in. (0.762 mm) or less are permitted in each joint if they are separated by a minimum of 0.125in. (3.175 mm). Cracks that are 0.125in. (3.175 mm) or less in length and are separated by a minimum of 0.125in. (3.175 mm) in all directions are permitted in the weld or braze material of each joint. Two or more cracks that are separated in a 0.125in. (3.175 mm) crack length distance is treated as a single crack and are permitted in the weld or braze material of each joint.

6. SUBTASK 72-45-24-230-059 Examine the Repaired Area

   NOTE

   This procedure is an alternative to Step.

   1. Fluorescent penetrant inspect the repaired area.

      1. Do the procedure given in the SPM TASK 70-23-01-230-501 or SPM TASK 70-23-02-230-501.

         Refer to Figure.

         Discontinuities that are 0.015in. (0.381 mm) or less, random or in clusters, are permitted if they are not in linear alignment. Six discontinuities that are porosity, voids or shrinkage and are 0.030in. (0.762 mm) or less are permitted in each joint if they are separated by a minimum of 0.125in. (3.175 mm). Cracks that are 0.125in. (3.175 mm) or less in length and are separated by a minimum of 0.125in. (3.175 mm) in all directions are permitted in the weld or braze material of each joint. Two or more cracks that are separated in a 0.125in. (3.175 mm) crack length distance is treated as a single crack and are permitted in the weld or braze material of each joint.

7. SUBTASK 72-45-24-280-060 Examine the Vane by the Airflow Check

   1. Do an airflow check.

      1. Do the airflow check on passage BL with passage BM blocked. Refer to Figure. Do the airflow check in the direction shown in Figure.

Figure: Stage 2 HPT vane cover replacement

Stage 2 HPT vane cover replacement



Figure: Stage 2 HPT vane cover replacement

Stage 2 HPT vane cover replacement



Figure: Weld or braze the replacement stage 2 HPT vane cover (PN 2A0049)

Weld or braze the replacement stage 2 HPT vane cover (PN 2A0049)



Figure: Weld or braze the replacement stage 2 HPT vane cover (PN 2A2706)

Weld or braze the replacement stage 2 HPT vane cover (PN 2A2706)



Figure: Stage 2 HPT vane airflow check limits

Stage 2 HPT vane airflow check limits



Figure: Weld and braze joints crack limits

Weld and braze joints crack limits