72-33-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
G. Patch Repair for Large Damage on the Vane of the Fan Exit Case (Fig. 806)
S 218-102-N00
(1)
Find the damage that you must repair with a large patch
(AMM 72-33-02/601).
S 358-103-N00
(2)
Remove the damaged pieces as follows:
(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.
(d)
File or sand the edges of the damaged area.
S 358-104-N00
(3)
Measure the size of the damaged area.
(a)
If the damage is more than the repair limits, you must remove or replace the vane.
S 118-105-N00
(4)
Clean the area around the damaged fan exit vane with a soft brush and a solution of wetting agent and water.
(a)
Flush with water and permit to air dry.
S 358-106-N00
(5)
Sand the repair area lightly with 240-400 grit sandpaper.
S 018-155-N00
(6)
Cut a patch of wire cloth to put on the repair area.
NOTE: This patch must no 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) Turn the patch to align it with the wire cloth in the leading edge.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE B
SEE A
0.5 INCH (12.700 mm) MINIMUM. NO REPAIRS ARE PERMITTED IN THIS AREA
A
SEE C
0.375 INCH
(9.525 mm) MAXIMUM
0.0-0.125 INCH
EDGE
LEADING (0.0-3.2 mm)
0.4-0.6 INCH
PERIMETER OF
(10.2-15.2 mm)
THE PATCH
WIRE MESH PERIMETER OF THE DAMAGE. A MAXIMUM OF ONE DAMAGED AREA IS
0.75 INCH
PERMITTED ON
(19.050 mm)
EACH VANE MAXIMUM
0.5 INCH (12.700 mm) PERIMETER OFLEADINGMINIMUM. NO REPAIRS THE REPAIREDGEARE PERMITTED IN THIS AREA AREA
VANE FAN EXIT VANE (EXAMPLE) C
B
Fan Exit Case and Vane Repair (Patch Repair of Large Damage)
Figure 806
D20369
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72-33-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b) Fold the patch to make it the same shape as the leading edge radius.
S 358-108-N00
(7)
If the wire cloth is not smooth, make the wire cloth smooth with pliers.
S 118-109-N00
(8)
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 air temperature, until there is no more alcohol in it.
S 118-110-N00
(9)
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 348-111-N00
(10)
Bond the patch to the vane as follows:
(a)
Apply mylar or teflon tape around the repair area.
(b)
Use the adhesive in the FEGV repair kit, or the optional Adhesive Paste Epoxy (PO8-025), or prepare the adhesive mixture as follows: 1) Add 30% +/- 3% (by weight) Milled Glass and 5% +/- 1% (by
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