Jan 10/90 32 2000
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. Nose Gear and Doors (continued)
5. Alignment of Nose Gear (refer to 32-20-00 Figure 502)
(a)
Place airplane on a smooth level floor which will show the striking of a chalk line.
(b)
Place airplane on jacks. (Refer to 7-10-00.)
(c)
Level airplane laterally and longitudinally. (Refer to 8-20-00 Figure 1.)
(d)
From the center of the tail skid, extend a plumb bob and mark the contact point on the floor.
(e)
Extendand attach a plumb bob from a point approximately 24 inches forward along the bottom-center row of rivets measured from tile wheel well opening. Mark the point of contact on the floor.
(f)
Usingthe two plumb bob marks as a guide, snap a chalk line extending several feet beyond eachmark.
(g)
Placethe rubber pedalsin neutral position (refer to 32-20-00 Figure 503).
NOTE: The rudder control system must be properly rigged before aligning nose gear steering.
(h)
Adjust steering rod end bearings to align nose wheel with chalk line. To align nose wheel straight forward, stand in front of the nose gear, align the center rib of the tire with the chalk line, or lay a straightedge along the side of the tire parallel and straightedge with the chalk line. One end of the rod must be disconnected and jam nuts loosened to make this adjustment. Do not attempt to make adjustment with one bearing; divide the adjustment between the bearings at each end of the rod. Check that rod ends have sufficient thread engagement, reinstall the rod and secure jam nuts.
Plumb Bob
Chalk Line
Alignmentof Nose Gear
Figure 502
EFFECTIVITY:
040-999 32-20-00 PAGE 11Jan 10/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. NoseGearand Doors (continued)
Rudder Pedal Assembly
Fuselage Station
57.00
Rudder Pedals Neutral Position Figure 503
5. Alignmentof NoseGear(referto 32-20-00 Figure502) (continued)
(i) To check nosegear steering for 24 degree maximumrightand16 degree left travel, marka line on each sideof the nosewheel for proper anglefromcenterlineand wheel pivot point.Turn wheelto maximum travel in both directionsto check forallowabletravel.Shouldtravelbe exceededin one directionandnotenoughin the other direction,checkfor possibledamageto thegearfork, torque links,or steering torquetube.
NOTE: Toensurefull travel of the nose wheel, ensureno gaps exist at pointswherethe steeringarmtravelbushings contact withthe steeringbellcrank.
6. Adjustmentof Landing Gear Propeller ReverseSwitch
Thepropellerreverseswitchis located on the nosegear torque link.
(a)Adjustswitch to activate when the oleo strut is within 0.25 + 0.12inches of its fully extended position.
(b)
Extendandcompressstrut to pressureswitchactuatesproperly.Connectanohmmeterto the electricalleads of the switch. Measurethestrut extension at the point wherethe switch closes. The distance must be within range givenin step (a).
(c)
Checktobe sure propellersmoveinto their reversepositionduringtaxi test.
CAUTION: DO NOTATTEMPTTO MOVE THE POWER LEVERSINTOREVERSEWITH THE ENGINESSTATIC,ASDAMAGEWILLRESULTTO THE LINKAGE.
EFFECTIVITY: 040-999
PAGE
12 32-20-00
Jan10/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. NoseGearandDoors(continued)
7. Inspectionof Nose Gear
(a)
Inspectbolts,bearings,bushings,andallballjointsforexcessivewear,corrosion,anddamage.
(b)
Inspectthegear housing, draglinks,idlerlink,uplockcable,rods,andattachmentplatesfor cracks,bends,ormisalignment.
(c)
Inspectthe down lockspringas follows:
(1.) Checkforexcesswearorcorrosion,especiallyaroundthelockportionofthe spring. The springmust return tocompletecompression.Aspringmustberejectedif wear or corrosionexceedsone-quarterthediameterofthe spring. Cleanawayallcorrosionand repaintthesprings.
(2.) Checktherightandleftgeardoor actuator springsfor loadtensionsbelowtheminimum allowabletolerances.Theminimumtensionfortheactuatorspringsis10poundsat3 inch extension.Ifone spring is rejected, replacebothsprings.
(3.) Checkthedownlockspringat the idlerlink for loadtension.Theminimumtensionis 20.5 poundsat7.312inchesextensionand47poundsat 11.312inchesextension. (4.) Checkthe uplock springat the uplockhookfor loadtension.Theminimumtensionis 4 pounds.Thischeckisperformedbyfasteninga fish type scale tothehookandspring.Pullsteadilyagainstthehookandspringto get a reading.
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