(a)
P6 Main Power Supply Panel
1) 6K18 APU ALTN CONT
(b)
P83 Panel, E8 Aft Equipment Center
1) APU PRIMARY CONT
S 018-001
(3)
Open the APU access doors:
(a)
Open the latches on the APU access doors.
(b)
Open the APU access doors.
(c)
Engage the support rods for the APU access doors.
E.
Procedure
S 848-002
(1)
Prepare the anodize solution:
(a)
Fill the container half full with the high purity water.
(b)
Add 4 ounces (113.4 grams) of the iridite power for each gallon
(3.8 liter) of the water.
(c) Add 0.007 ounces (2 ml) of the wetting agent for each gallon
(3.8 liter) of the water.
(d)
Mix the water, the iridite powder, and the wetting agent.
(e)
Fully fill the container with the high purity water.
NOTE: This solution must be discarded after 14 days.
____
S 848-003
(2)
Apply the anodize solution.
(a)
Remove all the loose intumescent paint with a plastic spatula.
WARNING: DO NOT GET THE PERCHLORETHYLENE IN YOUR MOUTH OR EYES, OR
_______ ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM THE PERCHLORETHYLENE. PUT ON A PROTECTIVE SPLASH GOGGLE AND GLOVES WHEN YOU USE THE PERCHLORETHYLENE. KEEP THE PERCHLORETHYLENE AWAY FROM SPARKS, FLAME, AND HEAT. THE PERCHLOREHTYLENE IS A POISONOUS AND FLAMMABLE SOLVENT WHICH CAN CAUSE INJURY OR DAMAGE.
(b) Clean the area with a lintfree cloth, crocus abrasive cloth, or emery cloth made wet with the solvent.
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747-400 MAINTENANCE MANUAL
(c)
Apply the anodize solution with a swab or a brush for 3-4 minutes.
NOTE:____The surface must stay wet during the full time. If the anodize solution does not make the surface wet, remove with a clean cloth and clean the area again.
(d)
Let the solution dry or rub the solution off with a clean cloth made wet with water.
(e)
Visually examine the area to make sure it all has the solution on it.
(f)
Rub the solution on the repair area with a lintfree cloth to make it the same color.
TASK 49-21-07-308-015
3. Load Gearbox Front Housing Intumescent Paint Repair___________________________________________________
A. Consumable Materials
(1)
B00148 Solvent - Methyl Ethyl Ketone TT-M-261
(2)
G02150 Agent - Wetting
(3)
B00738 Methylene Chloride
(4)
C00371 Paint - Intumescent, Avco 1600 BTX
(5)
G01043 Cloth - Lint Free
(6)
G01044 Cloth - Abrasive, Crocus P-C-458
(7)
G02077 Powder, Iridite (No. 14-2)
(8)
G02188 Cloth - Abrasive, 240 Grit
(9)
G02227 Water - High Purity
B.
Standard Tools and Equipment
(1)
Spatula - Plastic
(2)
Container - 1 U.S. gallon (4 Liter) capacity
C.
Access
(1)
Location Zone 318 APU Compartment - Load Gearbox Front Housing
(2)
Access Panel
317AL APU Access Door
318AR APU Access Door
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MAINTENANCE MANUAL
D. Prepare for the Intumescent Paint Repair
S 868-025
(1)
Make sure the APU control switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.
S 868-026
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
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