_ more than ten times the depth (Dim. P) of the damage.
3 The minimum radius R4 is equal to or more than fifteen times
_
the depth (Dim. P).
4 The radius R3 for the blend repair on either side of the
_ R initial damage is a minimum radius blend of 0.2 in. (5 mm) and R a maximum radius blend of 0.31 in. (8 mm).
5 If the distance (Dim. O1) between the blend repair and the
_ blade tip is not more than two times the depth (Dim. P) of the repair, do this step:
a Blend the bottom area of the repair tangentially from the
_
depth of the area to the blade tip and blend the tip to the R blending tip radius R2 with a minimum radius blend of 0.02 R in. (0.5 mm) and a maximum radius blend of 0.43 in. (11 mm) R at R2 minimum possible value.
(4) Leading edge and trailing edge repair in critical areas.
(a) The leading edge and trailing edge dimensions.
1 Taper the blend repair as follows:
_
R a_ The blend repair for the leading edge is not more than 0.04R in. (1 mm).
R b_ The blend repair for the trailing edge is not more thanR 0.059 in. (1.5 mm).
(b) The leading edge and trailing edge blend repairs are permitted with these limits.
1 Taper the blend repair as follows:
_ a The longitudinal direction of the repair must be equal to
_ or more than twenty times the depth (Dim. P) of the damage.
b The minimum radius R4 is equal to or more than thirty times
_
the depth (Dim P).
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(5) Blade tip repair (area C).
R (a) The blend repair does not extend more than 0.04 in. (1 mm).
(b) The chordal direction of the repair must be equal to or more than eight times the depth (Dim. P) of the damage.
(c) The minimum radius R4 is equal to or more than ten times the depth (Dim. P) of the damage.
(d) The radius R3 for the blend repair on either side of the initial R damage is a minimum radius blend of 0.2 in. (5 mm) and a maximum R radius blend of 0.31 in. (8 mm).
(e) The radius R1 blend repair between the leading edge and the tip R is not less than 0.02 in. (0.5 mm) and not more than 0.67 in. (17 R mm).
(f) The radius R2 blend repair between the trailing edge and the tip R is not less than 0.02 in. (0.5 mm) and not more than 0.43 in. (11 R mm).
(g) When the distance (Dim. O) between two blend repairs is less than or equal to five times the depth (Dim. P) of the repair, blend the two repairs together to a line which tangentially connects the bottom areas.
(h) If the distance (Dim. O1) between the blend tip repair and the blade leading edge is less than two times the depth (Dim. P) of the repair, do this step:
1 Blend the bottom of the repair tangentially across to the
_ blade leading edge and blend the tip to the blending tip radius R1 minimum possible value.
(i) If the distance (Dim. O1) between the blend tip repair and the blade trailing edge is less than two times the depth (Dim. P) of the repair, do this step:
1 Blend the bottom of the repair tangentially across to the
_ blade trailing edge and blend the tip to the blending tip radius R2 minimum possible value.
(j) The total chordal length of the blend repairs permitted on the R blade tip is equal to 0.8 in. (20 mm) per blade.
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(6) Fan blade airfoil blend repairs.
(a) The convex or concave blend repair. 1 Repairs are permitted on the surface with this limit:
_ a Do not repair inside the blade critical areas.
_
R 2_ If the distance (Dim. U) is not less than 0.079 in. (2 mm), doR this step: R a_ The convex or concave blend repair depth becomes not more
R than 0.024 in. (0.6 mm). 3 The concave or convex blend repair minimum radius R5 is not
_ less than five times the depth (Dim. K).
4 The concave or convex blend repair area length is the sum of
_ dimensions (Dim. S) and (Dim. T).
a The total length of (Dim. S) and (Dim. T) for a blend
_ R repair is not more than 0.425 in. (10.8 mm).
b The chordal length (Dim. S) for a blade is six times the
_ repair length (Dim. K).
c The maximun longitudinal length (Dim. T) is two times the
_
length (Dim. S).
d The distance (Dim. O2) between two blend repairs must be
_ more than the blend repair length (Dim. S) + (Dim. T) of the largest blend.
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