Jan 10/90 12-10-00
PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
E. MIL-1-27686Jet Fuel Anti-icing Inhibitors
The MIL-1-27686Jet Fuel Anti-IcingInhibitor,primarilyis an anti-icing agent, howeverit also has excellentmicrobiologicalsludge deterrent characteristics.It is very soluble in water,and only slightlysolublein fuel, which mandatesthatthe blending with fuel be accomplished in a precise manner. Such a devicepermitsinjectionof the agent into a flowingstreamof fuel to ensure even disbursement. Whenblending the additive,the concentrationshould not be less than 0.10 percentor more than 0.15 percentby volume. Exceptforthe information containedhereinand in the Pilot's OperatingHandbook,the manufacturer'smixingor blending instructionsshouldbe carefully followed.
CAUTION: ASSURETHATTHEADDITIVEIS DIRECTED INTO THE FLOWINGFUELSTREAM. THE ADDITIVE FLOWSHOULDSTARTAFTERAND STOP BEFORETHE FUEL FLOW. DO NOT PERMIT THECONCENTRATEDADDITIVE TO COMEIN CONTACT WITH THE AIRCRAFTPAINTEDSURFACESOR THE INTERIORSURFACESOF THE FUELTANKS.
CAUTION: SOMEFUELSHAVEANTI-ICINGADDITIVESPREBLENDEDINTHE FUEL AT THE REFINERY,SO NO FURTHERBLENDINGSHOULDBE PERFORMED.
CAUTION: THIS ADDITIVE SHOULDNOTBE USED AS A REPLACEMENTFOR PREFLIGHT DRAININGOF THE FUELSYSTEM DRAINS.
F. BioborJF (Biocide)
Biobor JF is not an anti-icing agentand is intended to be usedspecificallyas a fuel biocide. The compoundis an extremely efficientbiocidalagent and is soluble in the fuel as well as water. BioborJF disperses throughout the entire fuel systemto even the most remote areas soon after introductioninto the fuel system. Thiscompoundis used as a periodic treatment in concentrations of 135 ppm when the airplane hasbeen operated in an environment conductiveto contamination or when evidence of such contamination is found. Biobor JF may also be used in maximum concentrationsof 270 ppm as a single dose shock treatment to clean out and sterilize a very contaminatedsystem. Biobor JF is not volatileand may remainin the tank until the fuel is used.
The preferred methodof introducing BioborJF into the fuel is by injection througha metering device.
If no metering deviceis available, blendingmay be accomplished by batchblendingor by over-the-
wing blending while filling the tanks. Whenone half the required quantity of fuel has been added,
graduallyintroducethe compound directly into the stream of fuel while the remaining onehalf of fuel is
added. Complete mixingis necessary dependingon the severity of the contamination. It must be
used at a high enoughconcentrationto kill, not control the infestation. When used only periodically,it
mustbe used often enough to contact the entire surface of the fuel tank interiorsand remain in contact
up to 72 hours to effect the kill. An airplane which has been treated and flown, should be retreated at
consecutivefills so that a 72 hour contacttime is accomplished.
CAUTION: IT IS IMPERATIVETHATALL MANUFACTURER'SINSTRUCTIONSBEFOLLOWED WHEN USINGTHESE PRODUCTS
EFFECTIVITY:
040-999
12-10-00 Jan
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
G. Draining Moisture From Fuel System
To facilitate draining fuel system filter bowls, lines, and fuel cells of moisture and foreign matter,drains are incorporated in bottom of each filter bowl, wing tip tank, main outboard and inboard fuel cell, aft inboard fuel cells, and crossfeedlines. The nacelle fuel cells drain into main fuel cells and do not have individualexternaldrains.
WARNING: TO PREVENT RAMP SURFACE CONTAMINATION AND POSSIBLE FIRE DAMAGE,ANY FUEL SPILLED ON RAMP AREA, ETC, MUST BE REMOVED IMMEDIATELY.
1. Todrain either filter bowl, open access door on left rear side of each engine cowl and momentarily push down on the drain valve arm. Allow enough fuel to flow to clear filter bowl.
NOTE: Ensure nacelle tank is full to drain filter bowl.
2. To drain off water in fuel cells, push up on each cell drain arm and allow fuel to flow momentarily. Five drains; one for each tip tank, one for each main outboard cell, one for each main inboard cell, and one in inboard aft tank and crossfeedlinedrain on bottom of each wing.
NOTE: To ensure removal of moisture from each fuel drain, allow fuel to settle for three to four hours if possible.
H. DrainingFuel System -Complete
The bulk of fuel is drained from system by placing hose down through wing filler for standard systems or nacelle filler neck for optional systems. The fuel is drained from fuel filter bowls by activating individualfilter drains. Each wing is drained separately, providingcrossfeedvalves are in off position.
1. ProcedureFor Removing BiologicalFuel Contamination
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