A. Replenishing
1

26
25 24 28

1.
TIP TANKFUELFILL

2.
DRAINFORTIPTANK(ONFAIRING)

3.
ENGINEOILFILTER(OUTBOARD)

4.
OIL DRAIN(LINEFROMENGINE)

5.
HYDRAULICFILTER

6.
FUELFILTER

7.
NACELLE FUEL FILL -RIGHT

8.
SUBMERGEDFUELPUMP-RIGHT& LEFT

9.
INBOARDAFTCELLDRAIN-RIGHT& LEFT

10.
SHOCKSTRUTVALVEANDFILL-RIGHT& LEFT

11.
OUTBOARDCELLDRAIN-RIGHT& LEFT

12.
RIGHT& LEFTMAINTIRES

13.
DUALDRIVEOIL LINEFILTER-LEFTENGINE(OUTBOARD

14.
WASHRINGCONNECTIONANDCAP-LEFTENGINE

15.
FUELFILTER

16.
NACELLEFUELFILL-LEFTENGINE

17.
HYDRAULIC FILTER

18.
OIL DRAIN -LEFT ENGINE (INBOARD)

19.
ENGINE OIL FILTER (INBOARD)

14 18 13
19
20.
MAINFUELTANKDRAIN-RIGHT& LEFT

21.
OXYGENPRESSUREGAUGE

22.
PRESSURIZATIONCONTROLLERFILTER BLEEDAIR

23.
OXYGENFILL

24.
NOSEGEARTIRE

25.
APUCOUPLING

26.
BATTERY

27.
OXYGENBOTTLE(BEHINDROYALITEPANEL)

28.
NOSEGEARSHOCKSTRUTFILLVALVE

29.  

HYDRAULICBRAKERESERVOIRAND POWERPACKFILL

30.
ECUAIRWATERSEPARATOR

31.
HYDRAULICPOWERPACK

32.
VACUUMSYSTEMFILTER

33.
WASHRINGCONNECTIONANDCAP RIGHTENGINE(INBOARD)

34.
DUALDRIVEOILLINEFILTER RIGHTENGINE(INBOARD)

35.
ENGINEGEARBOXOILSTRAINER

Service Points
Figure 301

EFFECTIVITY: 040-999
PAGE
12-10-00
Jan10/901

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL

B. FuelHandling Practices
The handling of turbine fuel as used in this airplane requires some special attention and safety precautionswhich cannot be overly stated. There are several problems which are not normally associatedwithaviationgasoline.One is water or microscopic particlesof free water suspended in the fuel, another is microbiological or micro-organisms
contaminants whichlive and multiply in the water interfaces with turbine fuel. Due to these problems,turbinefuel requires good fuel handling practicesto assurethat the airplane is serviced with clean fuel. The following steps should be used to minimizethe possible introductionof contaminants into the fuel system and maintain a clean condition within the fuel cells:
1.  
Knowthe source (supplier) of the fuel to be used, ascertainthat it is properlystored and filtered as it is passed from the storagearea to the airplane.

2.  
Performregular fuel filter inspections to determine if any sludge is present. (Microbiological contaminationis visible as a slime or sludge which may vary in color, i.e. red, brown, gray or black.) Micro-organisms to mat and cause interference with fuel flow. Reference

have a tendency to FAA Manual A.C. 65-9, Chapter 4 gives complete explanationonfuels and related problems.

3.  
It is very important to maintain a clean fuel system by periodically flushing the fuel cells to remove any contaminants within.

C. Filling Fuel Cells
WARNING: DO NOT OPEN OPTIONAL NACELLE FUEL CELL FILLER OR WING FILLER CAPS WITH MORE THAN 2 INCHES OF FUEL IN TIP TANKS. WARNING: ALWAYS CONNECT STATIC GROUND CABLEFROM REFUELER TO AIRPLANE. KEEP ALL GROUNDING CONNECTIONS CLEAN AND CORROSION FREE.
The fuel cells in each wing are filled through wing filler cap. Optional nacelle fuel cells contain individualfiller neckson top of each nacelle insteadof wing fillers.
After refueling airplane, allow 3 to 4 hours settling period whenever possible,then drain small amounts of fuel from each drain. the benefits of a settling period will be lost, unless the accumulated contaminantswithin the fuel cells are drained before the airplane is moved or the fuel is disturbed by the operation of the internal fuel pumps. To reduce accumulationof condensation
within the fuel cells, it is suggested that the cells be maintained in a full condition as often as possible.
At intervals of 100 hours or 90 days, whichever comes first, clean the filter elements in each fuel filter unit located on the inboard side of each engine mount. Remove and clean the filters in accordance with instruction outlined in 28-00-00. Inspection intervals of the various fuel system components may be found in the Piper Progressive Inspection Manual, P/N 761 819 (100 Hour) and P/N 761 820 (50 Hour).
D. Jet Fuel Additives
Condensation of water in the fuel tanks increases the possibility of microbiological growth contaminationof the fuel. This contamination can damage skins, coatings and sealants in the tanks. Fuel additives conforming to MIL-I-27686 and/or a biocidal agent manufactured under such trade name's as Biobor JF are compounds which contain anti-fungicidal agents. Use of either of these additives in the fuel tanks will reduce the possibility of contamination of fuel and fuel filters/lines.
　
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