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surfaces,andpreventcontactwith sharp edges, comers, and dirty floors. (8.) Inspect cavities and ensure cleanlinessprior to cell installation. (9.) Do not stack cells.
WARNING: NO SMOKING OR OPEN FLAME IS ALLOWED WHEN REPAIRING CELLS.
(b) Observe the following rule when storing cells:
(1.) Clean used cells with soap and warm water prior to storage; dry and place in container. (2.) Fold cells smoothly and lightly as possible with minimum number of folds. Place protectivewaddingbetweenfolds. (3.) Wrap cell in moisture-proof
paper and place in suitable container. Do not crowd cell in container.Use wadding to prevent movement. (4.) Stack boxed cells to allow accesstooldest cells first. Do not allow stacks to crush bottom boxes. Leave cells in boxes until used. (5.) Storagearea must be approximately to sunlight, dirt, and
70°F and free of exposure damage.
4. Fuel Cell Compartment
(a)Clear cell compartment of all foreign materialsuch as trimmings,loose washers, bolts, or nuts.
(b)
Roundoff any sharp edges in fuel cell compartment.

(c)
Inspectfuel cell compartmentprior to fuel cell installation.

(d)Tapeover all sharp edges and rough rivets.
5. Removalof Wing Tip Tanks (refer to 28-10-00 Figure 401)
(a)
Draintank.

(b)
Removefairingbetween wing tip and tip tank.

(c)
Remove sender unit.

(d)
Disconnectelectricalwires to navigation lights and strobes.

(e)
Disconnectall plumbing from tip tank. Cover ends to prevent fuel contamination.

(f)
Supporttank, remove six bolts holding tank to the wing and remove tank.

EFFECTIVITY:

040-999
PAGE3
28 10-00 Jan10/90

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL

A. Storage(continued)
Bolt Assembly (6 Req.) 
Torque Bolt 50 to 70 in. lbs. 
TipTank Assembly  TipTank 
Fitting  lbs. 
-Plastic 
Tubing 
Bonding Strap 
VIEW A  VIEW B 

TipTankInstallation
Figure 401 (Sheet 1 of 2)

EFFECTIVITY:
040-999

Jan10/9028-10-00
PIPER AIRCRAFT PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL

A. Storage (continued)
Adapter
Tip Tank Skin
Sealant (PR1422 -A 2) for Dome Nut Sealing and Lightning Protection

SECTIONALVIEW A -A
Cover Plate

Gasket
Tip Tank Skin
Sealant(PR1422-A 2) for Dome Nut Sealingand Lightning Protection
SECTIONAL VIEW B -B

NOTE: If necessary,the tip tank dome nuts may be sealed by coating the entire surface of the nuts with with PR 1422 -A 2 sealant. The dome nuts must be coated with sealant on the fuel side as shown above. This will assure optimum lightning protectionfor the tank as well as a fuel seal for the nuts.
Tip Tank Installation 
Figure 401 (Sheet 2 of 2) 
EFFECTIVITY: 
040-999  28-10-00  PAGE 5 

PIPERAIRCRAFT

PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

A.  Storage(continued)
6.  InstallationofWingTipTanks(refer to 28-10-00Figure401)
(a)Connecttank to wing by installing six bolts.
(b)Connectall plumbing to tank.
(c)
Installsenderunit and connectelectricalleadstonavigationlightsandstrobes.

(d)
Installfairingbetweenwing tip and tip tank.

7.  RemovalofWingFuelCells(referto 28-10-00 Figures402,403,and404)
(a)Drainbothsystemswhenremovingcellsonbothsides.If only onesideis affected, or when replacingorservicingmaininboardfuelcell, close crossfeedvalveand drain appropriatetank or system.
(b)
Removenecessaryaccessplateson wing to gain accesstofuel cell andsenders.When removinginboardmainfuel cell, removeforwardbottomwing root andfuel cell drainpanelsandplates.

(c)
Inboardandoutboardmainfuelcellsinterconnect,

whereapplicable,withnacelletank,wing,andvent system throughfittingsmountedin wing skinlocatedundernacelle. When removingtanks,removetop center panelonnacelleto make accessto fittings. Removeboltsattachingfittingsto wing andallhardwarefromaffectedtank.

(d)
Disconnectwiresfromappropriatesenders,removescrewssecuringeachsendertofitting, and carefullywithdrawsender with itsgasketfromcell. Notepositionof each gasketrelativeto senderunitwhen removing, tofacilitatereinstallation.

(e)
Reachthrough appropriate accesshole.Loosenand disconnect clampsfrom nipples and interconnecting oftubesis necessary, fromwingby

tubes.If replacement remove
disconnectingeachtubeground strap fromsparandfromother tank.

(f)  On underside of wing, removescrewsmountingquick drain plates towing. Carefullydrawtwo fuel cell drainsoutofwing. (Enough to allow screwdriverto release clamps.)
　
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