R (a) Put the drive shaft head (2) in the 90 degree position, and use R the applicable grind tip to blend the HPC stage damaged.
 NOTE : Use longer blend tool tips for the forward blades, and
____ shorter blend tool tips for the aft blades.
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 (b) Apply the light source to the blend tool.

 NOTE : Do not install or remove a tool tip from the drive shaft
____ head with the drive shaft head in the zero degree position. If you remove the tool tip with the drive shaft head in the zero degree position, the drive belt will disengage.
 NOTE : Make sure the blend tip is pointed away from the operator
____ in the 90 degree position. Start the drive motor and make sure the tip rotates in the clockwise direction. If the direction of rotation is counter clockwise, check the drive belt for possible twisted installation.
 (3) Put the blend tool tip in the zero degree position. Put the blend tool tip into the compressor, through the borescope access port.

 (4) Put the primary blade edge grinding tip (1) in the borescope port, view the tool tip and move the tool tip from the zero degree to the 90 degree position.

R (5) Put the primary blade edge grinding tip (1) near the HPC blade R defect.
 (6) Align the blend tool tip with the blade defect and check for correct movement across the total length of the area to be blended.
 NOTE : Do not start the drive motor (14) at this time.
____
 NOTE : Make sure the blend tool tip correctly touches across the
____
 total area to be blended.

R (7) Use the primary blade edge grinding tip (1) and mark the two sides of R the blade defect.
 NOTE : The minimum blend radius should be eight times the depth of
____ the defect, or four times on both sides of the center of the blade defect.
R (8) Start the drive motor (14) and apply pressure to the grid tip (1) at R the defect area.
 (a) After sufficient practice with the grind tip (1) on the blade leading edge surface, turn on the motor using the on/off switch
 (16) and use the motor speed control (6) to increase speed.
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 NOTE : If the grind tip (1) does not turn freely, apply less

____ pressure to the blade edge surface.
R (9) During blending, make sure that you put a contour on the edge of the R blade and remove the sharp edges.
 (10) Stop the drive motor (14).

 (11) Put the grind tip (1) in the zero degree position.

 (12) Remove the grind tip (1) from the borescope access port.

 (13) Put the grind tip (1) in the 90 degree position.

 (14) Loosen the lockscrew and remove the grind tip (1) from the drive shaft head (2).

 NOTE : Do not install or remove a tool tip from the drive shaft head
____ with the drive shaft head in the zero degree position. If you remove the tool tip with the drive shaft head in the zero degree position, the drive belt will disengage.
 (15) Install the polishing ball tip (4) onto the drive shaft head (2) and tighten the lockscrew. This will prevent damage to the rotor blades or the blend tool.
 NOTE : Do not install or remove a tool tip from the drive shaft head
____ with the drive shaft head in the zero degree position. If you remove the tool tip with the drive shaft head in the zero degree position, the drive belt will disengage.
R (16) Put the polishing ball tip (4) in the zero degree position and put it R into the borescope access port. Next, put the drive shaft head (2) in R the 90 degree position.
 (17) Polish the blended surface and stop the drive motor (14).

 (18) Put the polishing ball tip (4) in the zero degree position and remove from the borescope port.

 (19) Use the standard borescope probe 1 configuration (magnified 1 : 1 at R 7 in. (177 mm)) and inspect the blended blades to make sure you R removed all the defect.
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 Subtask 72-31-00-290-052

 C. Follow-Up Inspection after the Borescope Blending
 (1) A one-time inspection of the blended area(s) no sooner than 25 cycles R and not later than 100 cycles is required.
 5. Close-up
________
 Subtask 72-31-00-410-066
　
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