夏延飞机维护手册 Cheyenne IIIA PA-42-720 AMM 1(42)

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Fuel system contamination presents a bigger potential problem in turbine fuel systems than in fuel systems using aviation gasoline because of turbine fuels greater affinity for water. Microorganisms thrive when water droplets and fuel are mixed since by-products created by this form of contamination attackfuel cell bladders and metal components; fuel system must be kept clean and periodically inspected to ensure it is free of water and other foreign matter. If biological contamination exists, evidencedby presence of red, brown, gray, or black slime in fuel tanks, lines, pumps and filters, thoroughlyclean all system componentswith lowest octane aviation gasolineavailable.
Proceedas follows:
WARNING: PROPER GROUNDING PROCEDURES AND SAFETY PRECAUTIONS MUST BE FOLLOWED.
1.  
Level aircraft.

2.  
Defuelaffectedwings,nacelles, and tip tanks.

fuel.

NOTE: Only use container designedfor use with contaminated
3.  
Removeall sump drains on effected sides and ensure all fuel is removed.

4.  
Removebottomwing root fairing.

5.  
Removefuel cell and tank access coverson wing upper surface.

6.  
Remove boost pump.

7.  
Removecowling of affectedengines.

8.  
Removefirewall mounted fuel filter and engine driven fuel pump inlet and outlet filters. Clean or replaceas required.

EFFECTIVITY:
040-999

Jan 10/90 12-10-00
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

1. ProcedureForRemovingBiologicalFuelContamination(continued)
9. Removeallfingerscreensandfloatorcheckvalves.
10.Cleanallfuelfilterbowlsandhousingswithaviationgasolineandinspectcomponentsforetching.Ifetchingexists,replaceaffectedcomponent.
CAUTION:  BRUSHMUSTHAVELANYARDATTACHEDTO PREVENTBRUSHFROM FALLINGWITHINCELL.
11. Removeaccesscoversfromfuelcellswhichrequirecleaning. UseStoddardsolventandsoft bristlebrushto scrub affectedcells. Removeanyparticlesof contamination in fuelcell with tack rag. Whenfuel cell cleaningiscompleted,ensureno equipmentis left infuel cellsand reinstallall
accesscovers.
NOTE:Nacelletankaccesscoverrequiressealing.
12.
Use lowestoctaneaviationgasolineavailable.Thoroughlyflushallfuel cells,tanks,connectingfuel lines,and boostpump.

13.
Inspectallfuelcells,tanks,pumps,and linesfordeterioration.Themicroorganismby-productsattachfuelbladders,harmfueltankcoatings,andetchunderlyingmetals.

14.
Reinstallboostpumpand safety.

15.
Reinstallall sumpdrains.

16.
Reinstallfirewall mountedfuelfilterbowlswithoutfilter elements.

17.
Reinstallbothfilter elementsand bowlson enginedrivenfuel pumpsandsafety.

18.
Flushsystemas follows:

(a)
Disconnectfuel line betweenfuel pressuresnubberandfuelpump.

(b)
Add eightgallonsof aviationgasolineto affected sides.

(c)
Pullall circuitbreakersexceptthosecontrollingfuelboostpump.

(d)
Placemaster switchin on position and actuateboostpump.

(e)
Afterpumpingtwo gallonsof aviationgasolineusingpump,observefuelcomingfromfuel line. Actuatecrossfeedvalve;ensurecrossfeedlineis clean.

NOTE:If right wingis only contaminated ensure valveandlineis
portion, crossfeed adequatelyflushedbydisconnecting lineatcrossfeedvalveon left wing
crossfeed side. Drainfuelintocontaminated
fuelcontainer.

19.Checkalllinesandfittingsforleaks.
20. Continueto pumpaviationgasolinethroughsystemuntil cleanfuelflows intocontaminated
container.
21.
Reinstallfilterelementsinfirewallmountedfuelfiltersandsafety.

22.
Reconnectfuellinesbetweenfuelflowtransmittersandenginedrivenfuelpumps.

23.Checksystemfor leaks.
24.
Reinstallbottomwingrootfairings,fuelcell,andtankaccesscovers.

25.
Reinstallenginecowlings.

26.
Fillaffectedfuelcellswith30gallonsoflowestoctaneaviationgasolineavailable.(Add

onequartof

120aviationgrademineraloil to every100gallonsoffuel) Runengines.Observeallcautionswhenoperatingengines.
NOTE:Makelogbookentryeachtimeengineisrunon aviation gasoline.Referto Pratt& WhitneyServiceBulletinNo.13044,EngineFuelsandAdditives.
27. Inspectfirewallmountedfuelfiltersafteroperatingengines.Lookfor evidence of microbiological
contamination.Ifcontamination
exists,repeatcleaningprocedure.

28. Cleanfuelfilters;reinstallandsafety.
EFFECTIVITY:
040-999
PAGE5
12-Jan  10/90

PIPERAIRCRAFT
PA-42-720(Advanced Tralner)
MAINTENANCEMANUAL
J.  BrakeSystem
The brakesystemcontainsa hydraulicfluid reservoirthroughwhichthe brake systemis periodically
serviced. Fluidis drawn fromthe reservoir by the brake mastercylindersto maintain the volumeof
　
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