Subtask 72-23-00-010-110
B. Get Access
(1) Put an access platform in position.
(2) Intall protective mats in the lower half of the inlet cowl.
(3) Remove the spinner front cone (Ref. TASK 72-21-00-000-005).
(4) Remove the spinner rear cone (Ref. TASK 72-21-00-000-006).
(5) Remove a sufficient number of fan blades to get access to the repair area (Ref. TASK 72-21-00-000-007).
4. Procedure
_________ (Ref. Fig. 803/TASK 72-23-00-991-317) Subtask 72-23-00-320-059
A. Repair of the Abradable Shroud with Circular Patches
(1) Remove the unwanted pieces of abradable liner.
(a) Punch out the abradable material to the base metal, at the location of the defect, maximum diameter 1.968 in. (50 mm).
(b) Use a scalpel and abrasive cloth 3 M 301D grit size 80 or 120 (Material No. CP2239) to remove all pieces of the abradable material.
(c) Blow the part clean with shop air.
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Subtask 72-23-00-110-054
B. Degrease Area
WARNING : CLEANING SOLVENTS ARE FLAMMABLE, VOLATILE, TOXIC. THEY SHOULD
_______ BE USED WITH ADEQUATE VENTILATION. AVOID PROLONGED BREATHING OF VAPORS AND REPEATED OR PROLONGED CONTACT WITH THE SKIN, OR CLOTHING.
R (1) Use the acetone (Material No. CP1039) or isopropyl alcohol (Material R No. CP1041) or stoddard solvent (Material No. CP2011) or ardrox 552 R (Material No. CP2559) or turco ind 79 (Material No. CP2560) or mag-R chem teksol (Material No. CP2566) or degreasol 99 R (Material No. R CP2584) or mag-chem skysol (Material No. CP2656) to remove the grease R from the area to be repaired.
Subtask 72-23-00-340-053
C. Apply the Abradable Liner Patch
R (1) Remove grease from the part with a clean, white cloth soaked in
R acetone (Material No. CP1039) or isopropyl alcohol (Material No.
R CP1041) or stoddard solvent (Material No. CP2011) or ardrox 552
R (Material No. CP2559) or turco ind 79 (Material No. CP2560) or mag-
R chem teksol (Material No. CP2566) or degreasol 99 R (Material No.
R CP2584) or mag-chem skysol (Material No. CP2656).
(2) Prepare the bonding compound as follows:
WARNING : PUT ON PROTECTIVE GLOVES WHEN YOU USE THE BASE AND
_______ HARDENER. IF YOU DO NOT OBEY THIS PRECAUTION, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
NOTE : You must use the compound within 2 hours after it is mixed
____
(a) Mix 100 parts of base RTV 147 A (Material No. CP2297) with 10 parts of catalyst (hardener) RTV 147B (black color) (Material No. CP2298) or use RTV 630 (Material No. CP2339), at ambient temperature.
(b) Stir the mixture manually or mechanically until it is fully mixed.
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(3) Apply the primer as follows:
(a) Remove grease from the area to be repaired.
(b) Apply the Primer 1200 (Material No. CP2244) on the degreased area of fan case with a clean, white cloth or a paint brush.
(c) Allow to dry at ambient temperature for 45 minutes.
NOTE : Too much primer will reduce adherence. Also do not touch
____ the primer after it is applied.
(4) Prepare the abradable liner patch as follows:
(a) From a (spare) new fan inlet case abradable cartridge (Ref. PIPC 72230065375), punch out a circular patch at the equivalent size of the defect.
NOTE : In this repair, the maximum diameter dimension of the
____ patch is set at 1.968 inch (50 mm).
(b) Lightly sand the underside and the edges of the patch with abrasive cloth 3 M 301D grit size 80 or 120 (Material No. CP2239).
(c) Punch one hole with a diameter 0.118 inch (3 mm) at the center of the patch. Keep the 0.118 in. (3 mm) diameter piece of abradable. It will be used as a cap after the final application of the repair patch.
NOTE : The hole of the center of the patch will do as a vent hole
____ during the application of the patch on the fan inlet case.
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