Preliminary Requirements

Procedure

1. SUBTASK 72-50-53-350-231 Clean the Areas of the Turbine Exhaust Case to be Repaired

   1. Refer to Figure.

   2. Use rotary austenitic stainless steel wire brush or silicon carbide abrasive wheel to remove oxides and prepare the repair area for weld. Refer to SPM TASK 70-31-13-310-501.

   3. Clean thoroughly the area to be welded and the adjacent heat-affected area.

      1. Refer to SPM TASK 70-11-26-300-503.

2. SUBTASK 72-50-53-310-092 Weld the Repair Area

   1. Refer to Figure.

   2. Weld build-up the repair area.

   3. Use CoMat 03-378 WELDING WIRE and the GTAW-MA method. Refer to SPM TASK 70-31-13-310-501 (IAE 16-2).

3. SUBTASK 72-50-53-370-109 Stress Relieve the Turbine Exhaust Case

   1. Stress relieve the case by one of the following methods:

      1. Locally stress relieve the case.

         1. Refer to SPM TASK 70-37-13-370-501, Cycle 6A.

      2. Oven stress relieve the case.

         1. Remove the helicoils at the bearing compartment cover and helicoils at the bearing jumper tube boss.

            1. Repair, VRS3014 TASK 72-50-53-300-046 (REPAIR-046) or Repair, VRS5392 TASK 72-50-53-300-008 (REPAIR-008).

         2. Remove the 13 nut plates at the inner rear flange.

            1. Repair, VRS3019 TASK 72-50-53-300-054 (REPAIR-054) or Repair, VRS5413 TASK 72-50-53-300-029 (REPAIR-029).

         3. Remove the three nut plates at the carbon seal flange.

            1. Repair, VRS3256 TASK 72-50-53-300-069 (REPAIR-069).

         4. Remove any nickel plating by the applicable repairs.

         5. Oven stress-relieve the case.

            1. Refer to the SPM TASK 70-37-13-370-501, Cycle 6A.

4. SUBTASK 72-50-53-220-287 Do a Hardness Check

   1. Do a hardness check on the surfaces adjacent to the repair area.

      1. Hardness must be 30 to 38 HRC or equivalent.

      2. Hardness check must be away from the weld and heat affected zone.

      3. Hardness check must be within the stress-relief area if a local stress-relief was performed.

5. SUBTASK 72-50-53-320-181 Finish Machine the Repair Area

   1. Refer to Figure, Figure and Figure.

   2. Finish machine the welded hole.

6. SUBTASK 72-50-53-110-219 Clean the Part

   1. Clean the part.

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

7. SUBTASK 72-50-53-230-155 Do an FPI of the Repair Area

   1. If a local stress relief was performed, do a local fluorescent penetrant inspection of the repair area.

      1. Refer to SPM TASK 70-23-05-230-501, high sensitivity.

         1. No cracks or indications are allowed.

   2. If a full furnace stress relief was performed, do a full fluorescent penetrant inspection of the part.

      1. Refer to SPM TASK 70-23-08-230-501.

         1. No cracks or indications are allowed.

8. SUBTASK 72-50-53-350-232 Install all Details if Removed

   1. Install the helicoils at the bearing compartment cover and helicoils at the bearing jumper tube boss.

      1. Repair, VRS3014 TASK 72-50-53-300-046 (REPAIR-046) or Repair, VRS5392 TASK 72-50-53-300-008 (REPAIR-008).

   2. Install the 13 nut plates at the inner rear flange.

      1. Repair, VRS3019 TASK 72-50-53-300-054 (REPAIR-054) or Repair, VRS5413 TASK 72-50-53-300-029 (REPAIR-029).

   3. Install the three nut plates at the carbon seal flange.

      1. Repair, VRS3256 TASK 72-50-53-300-069 (REPAIR-069).

9. SUBTASK 72-50-53-220-288 Do a Dimensional Inspection

   1. Refer to Figure.

   2. Do a dimensional inspection of the part.

Figure: Turbine Exhaust Case - Repair Zone

Turbine Exhaust Case - Repair Zone



Legend

1

Turbine Exhaust Case - Repair Zone 1. All Dimensions Are Applicable When Surface CY And Surface DA Are Flat In 0.005 Inch (0.127 mm) And Diameter CW Keeps 38.6513 Inch (981.7431 mm) Diameter and Diameter CX Keeps 33.0172 Inch (838.6369 mm) Diameter In A Free Or Held Condition. Hold The Part Only On Surfaces CY, CZ, DA, DB And Diameters CW, CX. 2. In A Free Condition, Surface CY And Surface DA Are Flat In 0.005 Inch (0.127 mm) And Diameter CW Is 38.607 - 38.704 Inches (980.618 - 983.081 mm) And Diameter CX Is 32.983 - 33.059 Inches (837.769 - 839.698 mm). 3. All The Surfaces Must Be 125 Micro-Inches (3.2 micro-meters). 4. Break Edges To 0.003 - 0.015 Inch (0.077 - 0.381 mm).

Close

Figure: Turbine Exhaust Case - Weld Area

Turbine Exhaust Case - Weld Area



Figure: Turbine Exhaust Case - Finish Dimensions

Turbine Exhaust Case - Finish Dimensions