(14)
Do the activation procedure for the trailing edge flaps (AMM 27-51-0/201).
WARNING: MAKE SURE NO PERSONS ARE IN THE SLAT AREA WHEN YOU DO THE ACTIVATION OF THE LEADING EDGE SLAT PROCEDURE. IF PERSONS ARE IN THE SLAT AREA, INJURY CAN OCCUR.
(15)
Do the activation of the leading edge slat procedure (AMM 27-81-0/201).
(16)
Close these circuit breakers on the overhead circuit breaker panel, P11, and remove DO-NOT-CLOSE tags:
(a)
11M15, FUEL PUMPS L CTR
(b)
11M16, FUEL PUMPS 4 FWD L AFT
(c)
11M24, FUEL PUMPS 4 CTR
(d)
11M25, FUEL PUMPS L FWD R AFT
(17)
Remove DO-NOT-OPERATE tags from boost pump switch lights on right side panel, P6.
(18)
Close any other circuit breakers that were opened for maintenance in the fuel tank.
(19)
Connect these airplane batteries and remove tags:
(a)
main (AMM 24-31-11/401)
(b)
APU (AMM 24-21-21/401)
(20)
Remove rope barrier and all precautionary signs.
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4. Biocide Treatment of Fuel Tanks
A. General
(1) Corrosion in fuel tanks can result from the presence of micro-organisms which live and multiply at the interface of fuel and water. The most effective way to prevent this problem is to reduce, if not eliminate, the amount of water retained in the tanks. Fuel tanks can also be treated periodically with a biocide to minimize problems arising from microbial growth. If a tank inspection should disclose microbial growth, the tank must be cleaned.
B. Equipment and Materials
(1)
Biocide Fuel Additive - Biobor JF, Hammonds Fuel Additives, Inc., Houston, TX, (281) 820-5674.
(2)
Biocide Fuel Additive - Kathon FP 1.5 Biocide, Rohm and Haas Company, Philadelphia, PA, (215) 592-3000.
C. Fuel Tank Treatment
(1)
Fuel tanks to approximately 10% capacity (Ref 12-11-0).
(2)
Service tanks to full with biocide treated fuel. Add biocide (Biobor JF) to fuel in a concentration not to exceed 270 parts per million by weight. Add biocide (Kathon FP 1.5) to fuel in a concentration not to exceed 100 parts per million (ppm) by weight. Preferred method of adding the biocide is by metered injection into flowing stream of fuel.
WARNING: BIOBOR JF TOXIC. AVOID BREATHING OF VAPOR OR CONTACT WITH SKIN.
CAUTION: CONCENTRATED BIOCIDE SHOULD NOT BE ADDED TO FUEL TANKS BECAUSE HIGH LOCALIZED CONCENTRATIONS CAN FORM SALT DEPOSITS. IF METERED INJECTION EQUIPMENT IS NOT AVAILABLE, REFER TO CORROSION PREVENTION MANUAL, PART I, SECTION 20-62-00 FOR OTHER APPROVED METHODS OF ADDING BIOCIDE TO FUEL TANKS.
(3) For effective control using Biobor JF, allow treated fuel to remain in tank for minimum of 72 hours.
NOTE: Biocide treated fuel may be used for engine operation after the 72-hour period. There is no need to defuel the airplane to remove the biocide.
For effective control using Kathon FP 1.5, allow treated fuel to remain in tank for a minimum of 24 hours.
NOTE: More than 24 hours may be necessary to completely kill all of the microbial growth.
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AIRCRAFT USE OF FUELS CONTAMINATED WITH DYE
1. General
A. Current engine manufacturers recommend limits for emergency usage of dye-contaminated aviation turbine fuel and actions to be taken if fuels contaminated with dye have been inadvertently delivered or loaded on aircraft.
B. As of October 1993, the United States Environment Protection Agency (EPA) required that fuel not meeting the low sulfur requirements for diesel fuel (fuels having greater than 0.05% sulfur) must be dyed red. While jet fuels are exempt from this requirement, it does apply to diesel fuel intended for off-road uses and heating oils with higher sulfur contents. The use of dye in distillate fuels can lead to the possibility that jet fuel may be contaminated with dye.
C. Incidents of extremely small concentrations of red dye in jet fuel at airports are continuing to occur. The likelihood of a major airport shutdown because of red dye contamination in jet fuel is a serious concern for the aviation industry.
D. Due to the likelihood that an airport shutdown could occur due to red dye contamination, an industry committee, including engine, APU and airframe manufacturers with airlines and FAA representation, has been researching the effects of red dye. The industry committee has confirmed and agreed that limited use of contaminated fuel would be acceptable and the FAA has granted conditional approval for emergency use.
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