Preliminary Requirements

Procedure

1. SUBTASK 72-41-20-350-001 Remove the Damaged Vane

   1. Position the rear case to get access to the damaged vane.

   2. NOTE

      Position in the assembly of the vane removed to gain access to the damaged vane must be recorded.

      Remove the damaged vane.

      1. Refer to TASK 72-41-20-040-001.

2. SUBTASK 72-41-20-350-002 Remove, Clean and Measure the Nearest Serviceable Vane

   1. Refer to Figure and Figure.

   2. Remove the nearest serviceable vane.

      1. Locate the damaged vane.

      2. Remove the nearest adjacent serviceable vane.

      3. Refer to TASK 72-41-20-040-001.

   3. Clean the nearest serviceable vane.

      1. Refer to the SPM TASK 70-11-34-300-503.

   4. Measure the nearest serviceable vane.

      1. Use workshop inspection equipment.

      2. Measure the vane at three positions given in figure.

      3. Record the measurements.

3. SUBTASK 72-41-20-220-216 Measure the Replacement New Vane

   1. Refer to Figure and Figure.

   2. Measure the replacement new vane.

      1. Use workshop inspection equipment.

      2. Measure the vane at three positions given in figure.

      3. Record the measurements.

4. SUBTASK 72-41-20-220-217 Mark-out the Replacement New Vane

   1. Refer to Figure and Figure.

   2. Mark the replacement new vane.

      1. Mark the area to be cropped from the tip on the replacement new vane.

      2. Use workshop inspection equipment.

      3. Measure the vane at three positions given in figure.

      4. Use the difference in dimensions recorded in Step para D. and Step

      5. Make sure the mark is within 0.002 in. (0.05 mm) of the required distance from the vane platform.

      6. Use CoMat 02-096 MARKER PEN.

5. SUBTASK 72-41-20-350-003 Crop the Replacement New Vane

   1. 

      CAUTION

      IF YOU USE MECHANICAL CUTTERS ON THE VANE, MAKE LIGHT CUT TO PREVENT OVERHEATING OF THE MATERIAL.

      Refer to Figure and Figure.

   2. Attach the replacement vane.

      1. Attach the replacement new vane into an applicable fixture with soft jaws.

         The fixture must safety the vane at the airfoil not only at the root.

   3. Remove tip material by cropping.

      1. Hand crop the tip of the vane.

      2. Make sure that the tip is dressed in the direction from the leading edge tip to the trailing edge tip.

         If necessary, use mechanical hand cutters, smooth hand metal file and/or CoMat 05-140 ABRASIVE STONE SILICON CARBIDE.

      3. Make sure that you get the dimensional limits set in Step

   4. Blend and polish the replacement new vane tip.

      1. Make sure that the tip is dressed in the direction from the leading edge tip to the trailing edge tip.

      2. Use CoMat 05-020 WATERPROOF SILICON CARBIDE, CoMat 05-082 WATERPROOF SILICON CARBIDE and CoMat 05-127 ABRASIVE PAD.

      3. Make sure that you get the dimensional limits set in Step

6. SUBTASK 72-41-20-110-059 Swab Etch the Cropped Area

   1. Do a local swab etch of the dressed area.

      1. Refer to the SPM TASK 70-11-39-300-503, SUBTASK 70-11-39-300-001.

7. SUBTASK 72-41-20-230-001 Crack Test the Cropped Area

   1. Locally crack test the cropped area.

      1. Refer to the SPM TASK 70-23-01-230-501.

      2. Use CoMat 06-063 FLUORESCENT PENETRANT (POST-EMULSIFIED MEDIUM SENSITIVITY).

         1. Cracks are not permitted.

         2. If you find cracks, do the Step thru Step again with a new replacement vane.

8. SUBTASK 72-41-20-110-060 Clean the Replacement New Vane

   1. Clean the replacement new vane.

      1. Refer to the SPM TASK 70-11-03-300-503.

9. SUBTASK 72-41-20-220-218 Dimensionally Examine the Replacement New Vane

   1. Refer to Figure and Figure.

   2. Dimensionally examine the replacement new vane.

      1. Use workshop inspection equipment.

      2. Measure the vane length at three positions given in figure.

      3. Make sure the vane length is within 0.002 in. (0.05 mm) of the adjacent serviceable vane length measured in Step para D.

         1. If the vane is outside the required limits do the Step thru Step again with a new replacement vane.

10. SUBTASK 72-41-20-350-004 Identify the Replacement New Vane

    1. Mark the repair symbol adjacent to the part number.

       1. Refer to the SPM TASK 70-09-00-400-501, SUBTASK 70-09-00-400-001.

       2. Use Vibrating marking pencil.

       3. Mark the symbol 20 inside a triangle adjacent to the part number.

11. SUBTASK 72-41-20-350-005 Install the Replacement New Vane

    1. NOTE

       Vanes must be installed again at their original positions in the assembly.

       Install the replacement new vane in original vane set.

       1. Refer to TASK 72-41-20-440-000.

Figure: Repair Details and Dimensions

Repair Details and Dimensions



Figure: Repair Details and Dimensions

Repair Details and Dimensions