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(c) The longitudinal direction (Dim. W) for a blend repair must be equal to or more than eight times the depth (Dim. V).
(d) The minimum radius R6 is equal to or more than ten times the depth (Dim. V).
(e) The radius R3 for the blend repair on either side of the damage is a minimum radius blend of 0.2 in. (5 mm) and a maximum radius blend of 0.31 in. (8 mm).
(f) The minimum distance (Dim. M) is equal to or more than six times the depth (Dim. V).
(g) The maximum distance (Dim. N) is two times the length (Dim. M).
(h) The total length of (Dim. M) and (Dim. N) for a blend repair is not more than 0.35 in. (9 mm).
(i) The distance (Dim. X) between two blend repairs, located either on the same or opposite sides, must be more than 0.177 in. (4.5 mm).
(j) The total length (Dim. W) of all blend repairs must not be more than 0.16 in. (4 mm).
Subtask 72-21-00-320-052
C. Do the blending operation as follows:
CAUTION : EXCESSIVE HEAT CREATED DURING BLENDING CAN WEAKEN BLADE. TO
_______ AVOID EXCESSIVE HEAT WHEN POWER GRINDING OR BLENDING TOOLS ARE USED, CHECK FOR HEAT BUILDING BY TOUCHING OCCASIONALLY WITH BARE HAND. IF BLADE BECOMES TOO HOT TO TOUCH, ALLOW MATERIAL TO COOL BEFORE CONTINUING REPAIR.
NOTE : If five or more fan blades have been subject to this blending
____ repair, perform trim balance operation. It is recommended that location of repaired blades be recorded to perform trim balance operation.
(1) Remove the surface damage from the blade airfoil per (Ref. SPM 704111) using a soft file or strips of durite G422 (Material No. CP2189) or durite G421 (Material No. CP2191) grade 150 or 180, used dry. The blended areas must make a smooth transition into the surrounding areas.
NOTE : To prevent axial scratches, always do the blending in a
____ longitudinal direction, parallel with the length of the blade.
(2) Complete the blending with strips of durite G422 (Material No. CP2189) grade 400 or 800, used dry. The surface finish (roughness) on blended areas must be as close as pratical to the original finish.
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(3) If a large or deep blend is required, a low speed power tool equipped with an appropriate titanium grinding tool may be used to shorten the time required to remove the metal per (Ref. SPM 704112) but you must complete with hand blending as told above.
NOTE : Reworked contour must conform to original contour.____
(Ref. Fig. 805/TASK 72-21-00-991-334)
Subtask 72-21-00-110-054
D. Clean the blade:
CAUTION : TITANIUM PARTS REQUIRE THE USE OF NON-HALOGENATED SOLVENTS._______
R R R R R (1) Clean blade using isopropyl alcohol (Material No. CP1041) or acetone (Material No. CP1039) or stoddard solvent (Material No. CP2011) or ardrox 552 (Material No. CP2559) or turco ind 79 (Material No. CP2560) or mag-chem teksol (Material No. CP2566) or degreasol 99 R (Material No. CP2584) or mag-chem skysol (Material No. CP2656) .
Subtask 72-21-00-230-052
E. Inspect blended area.
(1) Fluorescent inspect blended area for cracks (Ref. TASK 70-51-00-230-002). No crack is allowed.
NOTE : If you did the blending operation on the leading edge in area____ B, you can delay the fluorescent-penetrant inspection by 10 flight cycles or 25 flight hours. In this case, you must do a visual inspection with a magnifying glass power 10x to 20x under Light source - white, to make sure sure that the damage is fully removed.
(a) If necessary, repeat blending and inspection until no crack is detected. Refer paragraph A. to paragraph D.(1).
(2) If you have a template, TEMPLATE, CHECKING - FAN BLADE LEADING EDGE (856A2949G01), use it after the blending of the leading edge as follows:
(a) Put it on the leading edge of the blade on concave side so that the tabs touch the leading edge and the midspan shroud fillet radius with airfoil.
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