D.  The addition of Biobor JF must be accomplished with extreme care to prevent
localized concentration resulting in borax salt deposits.

Volume  1

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CORROSION PREVENTION MANUAL
STANDARD PREVENTIVE MAINTENANCE METHODS
MICROBIAL GROWTH IN INTEGRAL FUEL TANKS

E.  These deposits will not go back into solution and can eventually be picked
up in engine filters. The preferred method of adding Biobor JF is by metered
injection directly into the flowing stream of fuel.

Method 1.  Mix the required amount of Biobor JF in a fuel tanker, making
sure of good mixture. Make sure no water is present in the
airplane tank and fuel the airplane.

Method 2.  Fill the airplane tank to at least one-half full of fuel. Mix the
required amount of Biobor JF in from 10 to 20 gallons of fuel.
Add this to the tank through the overwing fueling port and
immediately finish fueling the tank through the same filler port.
Circulate the fuel in the tank to assure that the Biobor JF is
well mixed with the fuel.

CAUTION:  BEFORE ADDING UNDILUTED BIOBOR JF TO THE FUEL TANK, MAKE SURE NO WATER
IS TRAPPED IN THE TANK UNDER OR NEAR THE OVERWING FILL PORT.

Method 3.  Fill the airplane tank to a least 60% full and add the required
amount of Biobor JF directly to the tank. Immediately finish
filling the tank through the overwing port and then mix by
starting the boost pumps and circulating the fuel to assure that
the Biobor JF is mixed thoroughly. Before adding Biobor JF to the
tank make sure no water is trapped in the tank.

NOTE:  When the 757 main tanks are 45% full there is no fuel
under the overwing filler ports.

When the 767 main tanks are 80% full there is no fuel
under the overwing filler ports.

When using Method 2 or 3 fill one main tank and thoroughly
mix; then fill the center auxiliary tank and then
opposite main tank through the crossfeed and fueling
manifold systems. Refill the main tank as before.

F.  Before performing the treatment of airplane fuel tanks with biocide, drain
any residual water from the tank as described in Chapter 12 of the Mainte-nance Manual.

G.  For effective control the suppliers of Biobor JF recommend that it remain in
the tank for 72 hours before further untreated fuel is added. Under normal
airplane operations this is frequently impracticable, but it is advisable to
plan to add the biocide at a service check which will allow the treated fuel
to remain in the tank for at least 72 hours.

Volume 1

20-62-00

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OCT 01/02

CORROSION PREVENTION MANUAL
STANDARD PREVENTIVE MAINTENANCE METHODS
MICROBIAL GROWTH IN INTEGRAL FUEL TANKS

6. Frequency of Preventive Maintenance
　
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