Products Research (MIL-C-27725) Compound Cure Time
Versus Temperature and Relative Humidity (RH)
Figure 705
L48249
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D.
E.
F.
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747-400 MAINTENANCE MANUAL
(4)
Scraper - Phenolic, Hard Resin (commercially available)Consumable Materials
(1)
B00102 Abrasive, Aluminum oxide coated cloth - ANSI B74.18
(2)
B00148 Solvent, Methyl Ethyl Ketone (MEK) - ASTM D740
(3)
B00184 Solvent, Presealing, Cleaning Solvent - BMS 11-7
(4)
B01001 Solvent, General Cleaning of All Organic Coatings (AMM 20-30-81/201 or SOPM 20-30-81) - Series 81
(5)
B01002 Solvent, General Cleaning of Solvent Resistant Organic Coatings (AMM 20-30-82/201 or SOPM 20-30-82) - Series 82
(6)
B01008 Solvent, Final Cleaning of Metal Prior to Non-structural Bonding (AMM 20-30-88/201 or SOPM 20-30-88) - Series 88
(7)
C00064 Coating, Aluminum Chemical Conversion - BAC5719, Type II, Class A (MIL-C-5541, Class A)
(8)
C00307 Coating, Corrosion Resistant Finish for Integral Fuel Tanks - BMS 10-20, Type II
(9)
C00321 Coating, Corrosion Preventive Coating for Aircraft Integral Fuel Tanks - MIL-C-27725
(10)
G00270 Tape, Masking (general purpose) - 3M #250 (A-A-883)
(11)
G02088 Abrasive, Silicon carbide, waterproof paper - ANSI B74.18Access
(1)
Location Zones 500 Left Wing 600 Right Wing
Prepare to Apply the Corrosion Resistant Finish (Topcoat)
S 657-183
(1) Do this task: Fuel Tank Defueling, (AMM 28-26-00/201).
S 657-184
WARNING:_______OBEY THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. IF YOU DO NOT OBEY THE FUEL TANK PURGING AND ENTRY PRECAUTIONS INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(2) Do this task: Purging and Fuel Tank Entry (AMM 28-11-00/201).
S 487-207
WARNING: MAKE SURE THERE IS AN ELECTRICAL GROUND FOR ALL VENTILATION
_______ EQUIPMENT IN OR NEAR AN OPEN FUEL TANK. SPARKS IN OR NEAR AN OPEN FUEL TANK COULD CAUSE A FIRE OR EXPLOSION.
(3)
Connect the ventilation equipment to an electrical ground (AMM 20-41-01/201).
S 487-185
(4)
Set up the air Blower and the flexible hose to have a good flow of air in the fuel tank.
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747-400 MAINTENANCE MANUAL
S 167-186
CAUTION:_______ MAKE SURE THE CAPACITY OF THE EXHAUST FAN IS MORE THAN THE
CAPACITY OF THE AIR BLOWER. THE CAPACITY OF THE EXHAUST FAN
MUST BE MORE THAN THE CAPACITY OF THE AIR BLOWER TO MAKE SURE
THERE IS A GOOD FLOW OF AIR.
(5)
Use the exhaust fan and hoses to move exhaust air from the fuel tank to an open space away from the work area or hangar.
S 217-187
(6)
Examine the internal fuel tank and tubing surfaces for fungus (mildew) and corrosion.
NOTE: A slimy, black layer on the inner surfaces of the fuel tank,
____ soon after defueling, shows fungus contamination. As it dries, the layer becomes solid and turns light brown in color.
(a) If there is fungus or corrosion, clean the fuel tank.
S 147-189
(7)
Remove all loose finish with a wood or plastic Scraper and sand the surface with aluminum oxide abrasive, ANSI B74.18, paper or disks.
(a)
Do a check for loose finish on the surfaces adjacent to those with loose finish and other areas you are not sure about. 1) Apply a strip of pressure sensitive tape, 3M #250
(A-A-883), to the applicable surface. 2) Push on the pressure sensitive tape with constant and hard pressure. 3) Pull the pressure sensitive tape off the surface with a quick movement, vertical to the surface.
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