Preliminary Requirements

Procedure

1. SUBTASK 72-45-24-350-078 Unplug the Trailing Edge Slots and the Cooling Holes

   
   CAUTION
   REAMERS ARE RECOMMENDED AS AN ALTERNATIVE TO SPRING WIRE OR DRILL BITS FOR THE INITIAL PROBING. WIRE CAN BREAK OFF LARGER PIECES OF UNWANTED MATERIAL AND FORCE THEM INTO THE INTERNAL CAVITY. DRILLS BREAK EASIER AND CAN GET CAUGHT IN THE HOLE.

   1. Unplug the trailing edge slots and the cooling holes with a reamer. Use spring wire with a pin vise if you cannot reach an area with a reamer.

      1. Refer to Figure and Figure.

         Apply CoMat 10-058 PENETRATING OIL to the holes.

         Let the oil soak into unwanted material in the holes.

         Use a rotary motion while you probe.

         Intermittently move the reamer farther into the hole and then remove it while you hold the vane so the holes point down to let unwanted material fall out.

   2. 
      CAUTION
      THE AIRFOIL HOLES ARE DIFFERENT SIZES. MAKE SURE YOU USE THE CORRECT REAMER SIZE FOR EACH HOLE. DO NOT DAMAGE THE COATING WHEN YOU PROBE THE HOLES.

      Continue to probe so the holes in the airfoil and platform are to the diameters given in Figure, Figure and Figure.

      1. Finish the probing with wire. Reamers are tapered and will cause the holes to have a taper.

         If you use a wire, the taper will be kept to a minimum.

2. SUBTASK 72-45-24-130-054 Clean the Vane Assembly

   1. Do an ultrasonic cleaning to remove unwanted material from internal areas.

      1. Refer to the SPM TASK 70-13-02-300-501.

         Use CoMat 01-339 ALKALI CLEANER (GENERAL PURPOSE) at a temperature of 150 deg F (66 deg C) maximum.

         Position the vane at different angles to remove unwanted material from the inner areas of the vane.

         NOTE

         Ultrasonics will increase the temperature of the solution.

3. SUBTASK 72-45-24-720-051 Do an Airflow Check of the Vane Cluster Assembly

   1. Do an airflow check of the airfoil holes in the vane cluster assembly. It is not necessary to do an airflow check of the platform cooling holes.

      1. Refer to the SPM TASK 70-72-01-720-501.

         If the airflow is not sufficient, hand probe the holes again.

         Increase the hole size in small increments. Hand probe only a few holes at a time so you do not cause too much airflow.

         If there is too much airflow, examine the vanes again to find out if the condition is caused by the vane or by air leaks in the test setup.

         If there is too much airflow, reject the vanes.

4. SUBTASK 72-45-24-130-055 Clean the Vane Assembly

   1. Do an ultrasonic cleaning to remove unwanted material from internal areas.

      1. Refer to the SPM TASK 70-13-02-300-501.

         Use CoMat 01-339 ALKALI CLEANER (GENERAL PURPOSE) at a temperature of 150 deg F (66 deg C) maximum.

         NOTE

         Ultrasonics will increase the temperature of the solution.

Figure: Repair Details and Dimensions

Repair Details and Dimensions



Figure: Repair Details and Dimensions

Repair Details and Dimensions



Figure: Repair Details and Dimensions

Repair Details and Dimensions