(b)
Apply the pad to the surface where you applied the finish.
(c)
Let the solvent or the fuel soak the area.
(d)
Use heavy pressure and rub the area 100 times.
NOTE: Count each movement in one direction as one time.
____
(e) Look and see if the finish (topcoat) is removed.
NOTE: If you can see metal, the finish is removed.
____
TASK 28-11-00-207-127
8. Fuel Tanks Contaminated with Red Dye____________________________________
A. General
(1)
Service criteria and reporting requirements for red dye concentrations can be found in the Boeing service letter 737-SL-28-053, Airplane Use of Fuels Contaminated with Dye.
(2)
Do the procedure that follows if:
(a) The concentration of red dye is more than 0.28 milligrams per liter as shown by the JT-100s analyzer or equivalent.
B. References
(1) AMM 12-11-00/301, Pressure Refueling
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(2)
AMM 28-10-00/201, Purging and Fuel Tank Entry
(3)
AMM 28-23-00/201, Defueling
(4)
AMM 49-11-00/201, APU Starting and Operation
(5)
AMM 71-00-00/201, Power Plant Operation - Normal
(6)
AMM 73-11-02/401, Fuel Filter Cartridge
C. Procedure
S 867-128
(1)
Do not start or operate the engines or APU.
S 657-129
(2)
Defuel the fuel tanks to the fuel tank sump levels
(AMM 28-23-00/201).
S 027-131
(3)
Remove the fuel filter cartridge (AMM 73-11-02/401).
S 027-132
(4)
Do a check of the engine fuel filters and bowl for signs of
contamination of the fuel (AMM 73-11-02/601).
(a)
Replace the filters if there is contamination.
(b)
If there is no contamination, install the same filter (AMM 73-11-02/401).
S 657-133
(5) Refuel the fuel tanks with new clean fuel (AMM 12-11-00/301).
NOTE: For most airplane fuel tanks, this will give a dilution
____ ratio of new fuel to trapped fuel fuel in the range of 1000:1 to 10,000:1.
S 217-134
(6)
Take a fuel sample from the tank sumps (AMM 12-11-00/301).
S 217-135
(7)
If you see signs of continued contamination, repeat the defueling and refueling steps above.
(a) If the contamination continues, remove all fuel from the tank, including trapped fuel (AMM 28-10-00/201).
S 867-136
(8) If the samples from the fuel tank sumps do not show signs of contamination, do these steps:
(a)
Start the APU (AMM 49-11-00/201)
(b)
Start the engines (AMM 71-00-00/201).
(c)
Let them operate approximately 5-8 minutes or until the dirty fuel is flushed from the fuel system.
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(d)
Make sure that the engine and its controls operate correctly in all standard power settings.
(e)
Stop the engines (AMM 71-00-00/201).
(f)
Stop the APU (AMM 49-11-00/201).
(g)
Speak to the engine and APU manufacturers about more
inspections or tests.
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