PAGE6
32-10-00
Jan 10/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. MainGearandDoors(continued)
3. InstallationofMainLandingGear(referto32-10-00Figure401)(continued)
(f)
Positiondownlock switchbracketbetweenforwardand aft upperdraglinksand boltin place.
(g)
The downlock hookis installedon the draglink assemblyas follows:
(1.) PlaceUendofdownlockspringoverthebackofthehookwiththeloopstowardtheback.
(2.) Spreadthespringandfit loopsoverbushingextendingthroughhook.
(3.) Insertendsofspringintoholeslocatedindownlockswitchbracketoneachsideof drag
linkassembly.Pushhookdownbetweentwoupperdraglinksuntilboltholesinthelinks alignwithbushingholeofthehook. (4.) Insertpivotboltandoneachsideofthebushing,installspacerwashersto maintaina minimumamountof sideplay.Secureboltandsafetyit.
(h)
Thedown lockcableis installedby boltingthe slidingend of cableto the down lockhookand the otherend of theupperdrag linkarmwhileattachingthe landinggear actuatingcylinder. Checklubricationof slidingendof downlock cable.
(i)
Lubricatelandinggearassembly.(referto 12-20-00Chart 2 and Figure 301.)
(j)
Checkmaingearadjustment,operation,and alignment.
4. Adjustmentof MainLandingGear
(a)
Withthe airplaneon jacksandgear extended,disconnectinboardand outboardgeardoor operatingrods,keepingdoorsin the open position.
(b)
Disconnectdown lockoperatingrodorcablefromdown lockhook.
(c)
Thethrough-centeradjustmentof the sidebracelinksis as follows:
(1.) Maintaingearin downlockedpositionwithstopsurfacesof thesidebracelinkstouching.
(2.) Checkthatthelinkageis0.219to 0.281of aninchthroughcenter.
(3.) Ifonesideofthestopsurfacesdoesnottouch,fileitto obtaindesiredthroughtravel.
CAUTION: DO NOTFILEPINOR LETLINKAGEEXCEED0.281INCHTHROUGH CENTER.
NOTE:A fabricatedtoolcanbeconstructed traveloftheside
tocheckthrough-center bracelinkassemblywhilethelinksareinstalled.(referto32-10-00Figure501.))
(d)Usethefabricatedtoolinthefollowingprocedure:
(1.) Thegearmustbedownandlockedwithnohydraulicpressureonsystem.
NOTE:Theairplanecaneitherbeonoroffjacks.
(2.) Removecotterpinswhichsafetythenutssecuringbothuppersidebracelinksto attachmentplates.
NOTE:Onrightgearonly,removepinatthenutthatsecuringthelowerlinktothegear housing.Donotremovethenuts.
(3.) Placetooltubethroughelongatedholeintoolplate. Placetubeoverandbetweenupper linkattachmentnuts.
EFFECTIVITY:
040-999
32-10-00Jan
Jan 10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Main Gear and Doors (continued)
MATERIAL: Steelor hard aluminum 1.0 x .083 x 13.251 Tube 1.0 x 1.0 Rod .125 x 18.062 x 3.125 Plate 18.085 holesfor installation of bushing, sightslotandelongatedhole. 1.0x .083x 1.25Tube1.0x .083 x 1.25 Tube-
.125
Main GearSide Brace LinkTravel Tool
Figure 501
EFFECTIVITY:
040-999
Jan10/9032-10-00
PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. MainGearand Doors (continued)
4. Adjustmentof Main Landing Gear (continued)
(d) Use the fabricated toolin the following procedure (continued):
(4.) Swing plate up against the head of the bolt connecting the upper and lower links. The plate sleeve slides over the nut on the head of the bolt connecting the lower link to gear housing.
(5.) Look through sight hole in the plate and check that center of bolt is 0.219 to 0.281 inch below centerline onplace. (6.) Remove tool and reinstall cotter pins.
(e)Operatedownlock hook by hand to determine if it engagesfreely.Openand close joint severaltimes to assure the hook is working properly. If the hook does not clear the pin, continueas follows:
(1.) Ensure side brace stops are both touching.
CAUTION: DO NOT FILE PIN OR LET THE LINKAGES EXCEED 0.281 INCHES THROUGH CENTER.
(2.) If one link's stop is too high, file it down until both sides mate.
(f) When the hook is operating properly, proceedas follows:
(1.) Engagehookoverpin.
(2.) Force side brace linkage upward until the hook strikes the pin and stops movement.
(3.) Check gap between side brace stop surfaces and ensure it doesn't exceed 0.020 inches.
If clearance betweenstops exceeds 0.020 inch, the pin shows little or no wear, and the
link through travel is within limits, replace the hook.
cut pin, file off any burrs left by the cut, and drive the pin out from either side. Install a new pin and flange.
(g) If the pin requires replacement,
CAUTION: DO NOT TRY TO DRILL THE PIN OUT, WHICH COULD DAMAGE THE LINK.
(h)With down lock hook engaged, pull retraction armlocatedat the top of the forward side brace, towards the down lock hook to the limit of its travel. Pull down lock operatingrod or cable out to its full length and adjust the rod or cable end until the hook bolt can be freely inserted throughhooklugs.
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