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(a.) Applythe sealant0.125to 0.187inchthickto repairareawith spatulaor a paddle shapedtool. Firmlypresssealantin placeandform intodesiredshape.Lap new sealantoverold existingsealant0.125to 0.25inch.
(b.) Allowsealantto cureuntil stiff. Thissealantcuresto an acceptablehardnessin approximately16 hoursat 75°Fand 50% relativehumidity.Cureis hastenedwhenapplyingheat upto 130°F.
NOTE: Nacellefueltankscanbe filledwith fuelone hourafterapplicationof sealant. Thecure doesnotdependon exposureto airor elevatedtemperatures,and will sealevenwhencombinedwithfuel,withoutaffectingsealingefficiency.
(c.) After allsealanthasdried, proceedasfollows: 1 Plugall tankopeningswith temporarycapsand gaskets. 2 Installa modifiedfillercap,(shownin 91-00-00),whichacceptsan air hose
fitting. 3 Apply2 psi (55 inchesof water)closedcircuitair pressureintotank. 4 Allowpressureto stabilize(normallythe airpressurewill drop slightly). When
pressurestabilizes,returntank pressureto 2 psi (55inchesof water)andhold thispressurefor 5 minutes. Therewill be nodecreaseof pressureduringthis time,as indicatedbythe manometer.
5 Nothinglessthan a perfectsealis acceptable. 6 Checkall externalseamsandrivetsfor leaks. Usea non-corrosiveleak detectingsolution.
(b) FuselageSealing
Specialsealingcompoundsareusedto sealsectionsof the aircraftagainstleakageof pressurizedair. Thissealingis doneduringconstruction.Anyair leakagethroughoutthe pressurizedfuselagecannormallybe detectedwhilecarryingoutthe fuselagepressurecheck
in 21-30-00.
EFFECTIVITY:
040-999

Jan
51-20-00
Jan 10/90
51-20-00
PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

A. Processes(continued)
1,3,A . 1,2,3
.1,2,3
1,2,3 View A
ForwardPressure
Bulkhead
Bulkhead SealingMethods:

TubeAssembly  Tube Assembly 1. Faying Seal (Note A)
3
3. Brushcoat with "A" Type Sealant
: SPECIAL INSTRUCTIONS
A. UseRTV 88 with RTV 9811 catal yst.
B. Use faying seal method for w indow doublerall around windowopeniing. Do not use class"A"sealant.
C.Sealareabeforeinstallinginnerskin.
D.All  skin laps in pressure area must havefayingseals.
E. Use brushcoat as well as faying seal methodon areas where skins slide into final position.

F,Fayingsealwillbe appliedto tube F. Brushcoat bulkhead TV skin flanges, particularly at pressure bulkheads.
View A flange and mating surface on
bulkheadprior to assembly. Makesure all "Seal Plates" stringers, bolts,and rivets are sealedproperly. G.Apply glass cloth (Type 101) coated with sealant.
Fuselage Sealing (Forward) Figure201

EFFECTIVITY: 040-999
51-20-00

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

A. Processes (continued)
1,2,
1,3 -1,E,F
B.Use faying seal method for windowdoublerallaround window opening. Do not use class "A" sealant.
C.Sealareabeforeinstallinginner skin.
D.
Allskinlapsin pressure areamust havefayingseals.

E.
Use brushcoat as well as faying sealmethodon areaswhereskins slideinto final position.

F.Brushcoat bulkhead TV skin flanges,particularlyat pressure bulkheads.Make sure all "Seal Plates"stringers,bolts, and rivets are sealed properly.
G.Apply glass cloth (Type 101) coatedwith sealant.

FuselageSealing(Aft) Figure 202
EFFECTIVITY:
040-999

Jan 10/9051-20-00
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

A. Processes(continued)
1. SealingProcedures(continued)
(b) FuselageSealing (continued)
(1.) SurfacePreparation(Figures201and 202)
WARNING: WHENUSINGTHESECLEANINGSOLVENTSIN A CLOSEDAREA, FORCEDVENTILATIONMUSTBE USEDTO PROTECTPERSONNEL FROMTOXICFUMES.
All partsto be sealedmustbe thoroughlycleaned.Methylethylketone(MEK)or aliphatic naphthaare recommendedcleaningagents.
NOTE:  Aliphaticnaphthais preferablesinceit doesnot damagepaintedsurfacesor acrylicplastic(plexiglas)windows.
(a.) All parts,sub-assemblies,and assembliesto be sealedmustbe alodinedandprimed withzinc chromate,exceptpressurizedair ductwork,airboxes,etc,whichare alodinedonly.
(b.)  Removeallfilings,chips,loosedirt,and otherforeignobjectson surfacesto be sealedbyforced air,or vacuumcleaningandbrush.
(c.) Cleanall surfacesor voidsto be sealed,to removeall fingerprints,oil, orgrease. To clean,wipe affectedareaswith naphtha;usea clean,cottoncloth. Toprevent redispositionof contaminantsonsurface,the cleanedsurfacesshouldbewipeddry immediatelyand not allowedto air dry.
(d.) It is essentialthat onlycleanclothsbeusedforcleaning. Whena clothbecomes soiled,it mustbecleanedor discarded.Toavoidcontaminationof cleaningsolvent,it mustbe pouredonthe cloth. Repeatcleaningproceduresaboveuntilno contaminatesarelefton surfacesto be sealed.
　
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