2-4 COMPRESSOR ROTOR BLADES (FIRST-STAGE) INSPECTION (AVIM) (Continued)
2-4-1 INSPECTION (Cont)
3. Erosion limits for narrow chord blades are as follows:
a. Detail A shows new blade for comparison.
b. Acceptable leading edge erosion is 0.100 inch
maximum parent metal loss (Detail B) with no erosion on
underside of airfoil section.
c. Unacceptable leading edge erosion is more than
0.100 inch parent metal loss plus erosion on underside of
airfoil section (Detail C).
4. Damage limits for wide chord blades are as
a. Multiple superficial leading edge nicks 0.030 inch
maximum depth on any number of blades.
Nicks in leading and trailing edges become
increasingly critical toward the root of the
blade. Damage is not permitted within 0.050
inch of the blade root fillet radius.
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