edges on the perimeter of the repair area.
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SEE B
SEE A
OUTER BASE
SEE C A
WIRE MESH
LEADING EDGE (10.160-15.240 mm) 0.4-0.6 INCH (3.175 mm) 0.125 INCH ON THE WIRE MESH DAMAGE THAT IS NOT OF THE PATCH PERIMETER
(0.635 mm) 0.025 INCH
TRAILING EDGE PERIMETER OF THE DAMAGE THE REPAIR PERIMETER OF AREA
TRAILING EDGE LEADING OR
INNER BASE C VANE
B
L-A6124(0991)
Fan Exit Case and Vane Repair (Patch Repair of Small Damage) Figure 801
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 358-028-N00
(4) If necessary, cut a patch of wire cloth to put on the repair area of
the leading or trailing edge.
NOTE: This patch must not be larger than the repair area, and the____
edge of the patch must not be more than 0.125 inch (3.175 mm)
from the perimeter of the repair area.
(a) Fold the patch to shape the radius of the leading or trailing
edge of the vane.
S 358-029-N00
(5) If the wire cloth is not smooth, make the wire cloth smooth with
pliers.
S 118-030-N00
(6) Clean the surface of the stainless steel wire cloth before you apply
the adhesive.
(a) Clean the wire cloth with unsized cheesecloth and isopropyl
alcohol.
(b) Fully dry the wire cloth, at ambient temperature, until there
is no more alcohol in it.
S 118-031-N00
(7) Clean the repair area.
(a) Clean the repair area with unsized cheesecloth and isopropyl
alcohol.
(b) Fully dry the repair area, at ambient temperature, until there
is no more isopropyl alcohol in it.
S 958-032-N00
(8) Apply mylar or teflon tape around the repair area.
S 398-033-N00
(9) Apply the epoxy mixture around both the repair area and the patch
with a tongue depressor or a spatula.
(a) Make sure the patch is fully wet on both sides.
S 358-034-N00
(10)
Put the patch on the repair area.
S 958-035-N00
(11)
Wind a sheet of silicone rubber, teflon, or FEP release tape tightly around the patch.
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S 958-203-N00
(12) Apply a pressure of 5-10 psi (34.5-68.9 kPa) to the repair area for at least 24 hours at room temperature.
NOTE: An alternate procedure is to apply the same pressure for
____ 90 minutes at a temperature of 240-260°F (116-127°C).
S 958-036-N00
(13)
Remove the tape.
(a)
Blend any areas where there is too much adhesive with 240-400 grit sandpaper.
F.
Put the Airplane Back to Its Usual Condition
S 418-037-N00
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(1)
Close the thrust reversers (AMM 78-31-00/201).
S 418-038-N00
(2)
Close the fan cowl panels (AMM 71-11-04/201).
S 418-039-N00
(3)
Close the core cowl panels (AMM 71-11-06/201).
