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R R  Fan Blade Blending Repair limits Figure 804/TASK 72-21-00-991-333- 13 (SHEET 1)
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R R  Fan Blade Blending Repair limits Figure 804/TASK 72-21-00-991-333- 23 (SHEET 2)
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R R  Fan Blade Blending Repair limits Figure 804/TASK 72-21-00-991-333- 33 (SHEET 3)
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R Typical Examples of Unacceptable Leading Edges Contours R Figure 805/TASK 72-21-00-991-334
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 Subtask 72-21-00-220-054

 B. Examine the fan blades.
 (1) Leading edge and trailing edge in the critical root area.
 (a) Find the critical root area. R 1_The root area longitudinal dimension is 2.32 in. (60 mm).
 (2) Mid span shroud area.
 (a) Find the critical area for the mid span shroud.
R 1_ The critical areas are at 1.57 in. (40 mm) from the leadingR edge and at 1.18 in. (30 mm) on each side of the mid span R shroud.
R 2_ The critical areas are at 0.63 in. (16 mm) from the bottom ofR the mid span shroud and at 0.39 in. (10 mm) from the mid span R shroud trailing edge.
 (3) Leading edge and trailing edge repair in non critical areas.
 (a) The leading edge dimensions. 1 Taper the blend repair for area A and area B as follows:
_
R a_ In area A the blend repair is not more than 0.08 in. (2R mm). R b_ In area B the blend repair is not more than 0.339 in. (8.6
R mm). c When the distance (Dim. O) between two blend repairs is
_ less than or equal to five times the depth of the smallest of these blends, tangentially blend out the bottom of the two blends.
 d The total length of blend repairs permitted on the leading
_ R edge is equal to 2.76 in. (70 mm) per blade.
 (b) The leading edge (area A and B) blend repairs are permitted with these limits.
 1 Make sure that after you do the blending repair, the edge
_ thickness is not less than the initial thickness.
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 2 The longitudinal direction of the repair for area A must be

_ equal to or more than ten times the depth (Dim. P) of the damage.
 3 The longitudinal direction of the repair for area B must be
_ equal to or more than eight times the depth (Dim. P) of the damage.
 4 The minimum radius R4 is equal to or more than fifteen times
_ of depth (Dim. P) for area A.
 5 The minimum radius R4 is equal to or more than ten times of
_
 depth (Dim. P) for area B.

 6 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).
 7 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 the 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 R1 with a minimum radius blend of 0.02 R in. (0.5 mm) and a maximum radius blend of 0.67 in. (17 mm) R at R1 minimum possible value.
 (c) The trailing edge dimensions.
 1 Taper the blend repair as follows:
_
R a_The blend repair is not more than 0.059 in. (1.5 mm).
 b When the distance (Dim. O) between two blend repairs is
_ less than or equal to five times the depth of the smaller repair area, blend the two repairs together to a depth of a line which tangentially connects the bottom areas.
 c The total length of blend repairs permitted on the trailing
_ R edge is equal to 1.77 in. (45 mm) per blade.
 (d) Trailing edge blend repairs are permitted with these limits.
 1 Make sure that after you do the blending repair, the edge
_ thickness is not less than the initial thickness.
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