NOTE: Vanes with damage greater than 0.300 inch (7.620 mm) must be
____
replaced (AMM 72-33-02/801).
(3)
Fan exit guide vanes repaired by this procedure which show tape deterioration can be repaired again. All old tape must be removed before the application of the new tape repair.
B.
Consumable Materials
(1)
G50016 Cheesecloth, Unsized
(2)
GO2391 Abrasive Paper, Silicon Carbide (400 Grit)
(3)
G50015 Tape, Masking
(4)
G02478 Gloves, Plastic Polyethylene
(5)
B00311 Abrasive Paper, Silicon Carbide (240 Grit)
(6)
G50012 Tape, Protective Polyurethane
(7)
G50011 Promoter, Adhesion 86A
(8)
B01056 Isopropyl Alcohol, Reagent Grade
C.
Procedure (Fig. 811)
S 028-204-N00
(1)
If necessary, remove stage I (fan) blades (AMM 72-31-02/401).
S 218-205-N00
(2)
Find the leading edge of the fan exit vane that can be repaired.
S 038-206-N00
(3)
Remove the leading edge damage as follows:
(a)
Sand repair area lightly with 240 grit or 400 grit Abrasive Paper to remove any sharp edges.
(b)
Sand repair area lightly with Abrasive Paper 240 grit or 400 grit to remove any loose material.
(c)
Apply Masking Tape to a 1.00 inch (25.400 mm) wide area from both sides of the leading edge.
S 108-207-N00
(4)
Prepare the leading edge for Polyurethane Tape application as follows:
(a)
Sand within masked area with Abrasive Paper 240 grit or 400 grit.
(b)
Remove the Masking Tape.
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72-33-02
ALL ú ú N01 Page 817 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(c)
Clean the repair area with Unsized Cheesecloth and isopropyl
alcohol.
(d)
Allow to air dry for 15 minutes.
NOTE: The cleaning process is important to the tape
____ adhering to the vane during service operation.
NOTE: It is important to keep the surfaces that are bonded
____ free from contamination. Use Plastic Polyethylene Gloves to help prevent surface contamination.
S 948-208-N00
(5)
Apply Adhesion Promoter to the leading edge repair area as follows:
(a)
Use Unsized Cheesecloth wetted with a minimum amount of
Adhesive Promoter and apply to the repair area.
(b)
Allow to air dry for 10 minutes or until surface is not glossy.
NOTE: Protective Polyurethane Tape applications over
____ Adhesive Promoter will be more difficult to remove.
S 458-209-N00
(6) Apply Protective Polyurethane Tape as follows:
NOTE: You must apply the Protective Polyurethane Tape within 1 hour
____
of the application of the adhesive promoter.
(a)
Mark the installation edge of the Protective Polyurethane Tape as follows: 1) Apply Masking Tape to a 0.75 inch (19.050 mm) wide area
from both sides of the leading edge.
(b)
Cut the Protective Polyurethane Tape to a width of 1.5 inch
(38.100 mm).
(c) Cut the Protective Polyurethane Tape to a length of 0.50 inch
(12.700 mm) to 0.75 inch (19.050 mm) less than the radial height of the vane leading edge.
(d) Remove the paper backing from the Protective Polyurethane Tape.
NOTE: Be careful not to allow tape adhesive side to attach
____
to itself.
(e)
Align one edge of the Protective Polyurethane Tape and put
against the edge of the Masking Tape.
(f)
Carefully apply the Protective Polyurethane Tape forward to the leading edge. 1) Make the tape smooth. 2) Pull the tape around the leading edge. 3) Continue to apply tape to the other side of the vane.
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