3. Job Set-up
__________
Subtask 72-23-00-941-078
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a warning notice to tell persons not to energize the FADEC 1(2).
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Subtask 72-23-00-010-089
B. Get Access
(1) Put an access platform in position.
(2) Install 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 repair area (Ref. TASK 72-21-00-000-007).
4. Procedure
_________
Subtask 72-23-00-320-053
A. Prepare the Repair Area
(1) Remove the damaged area from the abradable shroud, until only an area without damage is there.
NOTE : All oil contaminated areas must be removed.
____
(2) Make the surface of the repair area rough with an abrasive cloth (Material No. CP2239)
(3) Blow the dust out of the shroud or vacuum cleaner.
Subtask 72-23-00-110-052
B. Degrease the 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) Clean the area to be repaired with acetone (Material No. CP1039) or R stoddard solvent (Material No. CP2011) or ardrox 552 (Material No. R CP2559) or turco ind 79 (Material No. CP2560) or mag-chem teksol R (Material No. CP2566) or degreasol 99 R (Material No. CP2584) or mag-R chem skysol (Material No. CP2656) or isopropyl alcohol (Material No.
CP1041).
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C. Prepare the Base and Hardener for the Repair 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.
(1) Mix, by weight, 100 parts of the base RTV 147 A (Material No. CP2297) and 10 parts of the catalyst (hardener) RTV 147 B (black color) (Material No. CP2298).
(2) Stir the mixture by hand or mechanically until it becomes a homogenous compound.
NOTE : The compound has a pot life of 2 hours after mixing, at
____
ambient temperature.
(3) Apply the compound with a spatula. Lighthy hit the compound to remove the air bubbles (if any).
Subtask 72-23-00-350-052
D. Cure the Compound with a heat gun or a infra-red lamp as follows:
(1) 1 hour at 210 deg.F (98.9 deg.C).
(2) 1/2 hour at 200 deg.F (93.3 deg.C). Subtask 72-23-00-320-054
E. Complete the Repair as follows:
(1) Make sure the cured compound is constant in color. Make sure it does not contain air bubbles.
(2) Use an abrasive cloth (Material No. CP2239) to make the repaired surface smooth with all adjacent areas of the abradable shroud.
(3) Clean the repair area and the inlet cowl with a vacuum cleaner.
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________ Subtask 72-23-00-410-083
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Install the fan blades (Ref. TASK 72-21-00-400-007). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM ENGINE 发动机 2(8)
