F.
Repair the fan Exit Guide Vane
NOTE: In this procedure, the words "damage" and "repair area" are not
____ the same thing. The repair area is larger than the area of the damage. The repair area includes the area that you clean, sand, and put the patch.
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(1)
Remove the damaged pieces:
(a)
Lighty hit the surface of the vane, around the damage, to find the quantity of delamination.
NOTE: An area of delamination makes a sound with a lower
____ frequency than the other areas.
(b)
With a grease pencil, or other correct marker, make a mark around the perimeter of the damaged area.
(c)
Mechanically remove the damaged and loose material, which includes loose or torn wire mesh.
(d)
File or sand the edges of the damaged area.
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(2)
Measure the size of the damaged area.
(a)
If the area is more than the limits in Fig. 808, you must replace the vane.
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(3)
Clean the repair area and patch:
(a)
Clean the repair area with a soft brush and a solution of Wetting Agent (P05-152) and water. 1) Rinse the repair area with water and air dry.
(b)
Sand the repair area lightly with 240 - 400 gritt sandpaper.
(c)
Remove a full length wire mesh leading edge detail from the protective package.
(d)
Pre-fit the partial or full length patch over the leading edge and trim the patch to the correct length with shears or scissors.
(e)
Make a piece of cheesecloth (P05-038) moist with alcohol (P11-014).
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(f)
Clean the patch with the cheesecloth.
(g)
Dry the patch fully at air temperature.
NOTE: There must be no alcohol on the patch when you apply the
____
adhesive.
(h) Clean the repair area.
NOTE: Use the same method and materials that you used with the
____
patch.
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(4)
Bond the patch to the vane:
(a)
Put the mylar or teflon tape along the edge of the repair area, approximately 0.600 inches (15.240 mm) from the leading edge and parallel to the leading edge on both sides of the vane airfoil.
(b)
Use the adhesive in the FEGV Repair Kit PN 814765 or use optional Adhesive Paste Epoxy (P08-025) or as an option mix Adhesive Paste Epoxy (P08-016) with 27 - 33 percent (by weight) Glass (P05-147) and 4 - 6 percent (by weight) Agent (P08-011) or (P08-020). 1) Mix the mixture fully.
(c)
Do the steps that follow to mix the adhesive supplied with the FEGV Repair Kit (PN 814765): 1) Install the ramrod into the open end of the valved rod and
apply pressure to release the catalyst into the cartridge. 2) Mix the material by hand for approximately three minutes until a uniform adhesive color is observed.
NOTE: Turn the valved rod in a clockwise direction to mix
____ while you move the mixing head up and down in the cartridge. If a mixing machine is used, mix for approximately one minute.
3) Remove the ramrod and unscrew the valved rod.
4) Screw in the nozzle and dispense epoxy adhesive by use of a pneumatic dispensing gun, or push on the cap at the back of the cartridge.
(d)
Apply the mixture to the two sides of the patch. 1) Use a generous portion of the mixture. 2) Spread the mixture with a tounge depressor or spatula. 3) Also apply the adhesive to the damaged areas on the vane
leading edge.
(e)
Put the patch on the repair area.
NOTE: The epoxy mixture must not leak from the patch.
____
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