HPC Blade Borescope Blending Tool Figure 803/TASK 72-31-00-991-311- 12 (SHEET 1)
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HPC Blade Borescope Blending Tool Figure 803/TASK 72-31-00-991-311- 22 (SHEET 2)
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R Blend Area Example Figure 804/TASK 72-31-00-991-312
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R Borescope Blend Tool Tip Selection/Blend Tip Installation Figure 805/TASK 72-31-00-991-313
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R Compressor Blades Inspection Areas Figure 806/TASK 72-31-00-991-314- 12 (SHEET 1)
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R Compressor Blades Inspection Areas Figure 806/TASK 72-31-00-991-314- 22 (SHEET 2)
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_____________________________________________________________________________ INSPECT/CHECK MAXIMUM BLENDABLE LIMITS _____________________________________________________________________________
(a) Up to 20 percent of the blades in each Maximum area is 0.20 x 0.20 stage can have tears, nicks, erosion in. (5.1 x 5.1 mm) after you and material that is not there. blend.
(b) No maximum number of dents. Maximum depth is 0.080 in.
(2.03 mm). Maximum deflection from initial contour is 0.080 in.
(2.03 mm).
Subtask 72-31-00-320-053
B. Perform Blade Blending
NOTE : Equivalent substitutes for the HPC, blade, borescope, blending
____ tool (Wolf tool 5.08036.00) and CCD video camera and monitor (Wolf Compatible) are not permitted unless approved by CFMI.
(1) Measure the damaged area as follows:
NOTE : Do not install or remove the 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.
(a) Put the drive shaft head (2) in the 90 degree position. Install the measuring grid tip (5) onto the drive shaft head (2) and tighten the lockscrew. This will prevent damage to the rotor blades or the blend tool.
(b) Put the measuring grid tip (5) in the zero degree position and put the tool (4) into the borescope port.
(c) Monitor the measuring grid tip (5), and position the drive shaft head (2) to the 90 degree position.
(d) Put the measuring grid tip (5) near the HPC blade damage area.
NOTE : Each square on the grid is 0.039 x 0.039 in. (1.00 x 1.00
____
mm).
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The overall grid size is 0.197 x 0.197 in. (5.00 x 5.00 mm).
(e) Write down the damage result such as defect size and location.
(f) Compare the recorded blade damage against the permitted blend limits.
NOTE : Make sure the blade damage is less than the permitted
____
blend limits.
(g) If the damage is less than permitted limits, find the length of the blend necessary to keep the minimum blend radius.
(h) Calculate the minimum blend radius at eight times the depth of the defect, or four times on both sides of the center of the blade defect.
R (i) Put the drive shaft head (2) in the zero degree position, and R remove the tool from the borescope port.
R (j) Put the drive shaft head (2) in the 90 degree position. Loosen R the lockscrew, and remove the measuring grid tip (5) from the R drive shaft head.
(2) Blade blending procedure
R NOTE : Do not blend into the lower 25 percent of the airfoil length
____ R (L).
NOTE : When blending rotor blades, blend in a radial direction in
____ relation to the engine centerline. Avoid removing metal from leading and trailing edges of airfoil sections in such a way that the edges become thin or sharp; blend so as to maintain approximately the original contour.
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