PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. MainGearand Doors(continued)
4. Adjustmentof Main LandingGear (continued)
(j)
Partiallyretractand extend gear several times to see that down lock is operating properly.
NOTE: Referto adjustmentof landing gearlightswitches(32-60-00).
(k)
Pull retraction arm outboard in its slot. Crank assembly inboard in its slot.
(I)
With actuator retracted underpressure,adjust actuator rodend until fork bolt slips in easily. Turnactuatorrod end in one turn and install fork bolt.
NOTE: When installing fork bolt in the actuator rod end, be sure that the forked end is properly alignedwith the down lock operating rod.
(m)Partiallyretractand extend the gear. As the side braces approachthe locked position,exert a side force inboardon the wheelso the hydraulic actuatorforcesthe linkageinto the locked position. If gear fails to lock, adjust actuator rod end inward in half turn increments untilgear locksdown against the side load.
(n) Adjust up lock hook using the following procedure:
(1.) Disconnect uplock hookoperatingrod or cable fromhook.
(2.) Retract gear,being careful to keep the rod clear of moving parts.
(3.) As up lock roller approaches the hook, operate hook by hand until roller is engaged.
CAUTION BE SURE ALL ROD ENDS HAVE SUFFICIENTGRIPPINGTHREADSO A WIRE CANNOTGO THROUGH THE CHECK HOLE IN THE ROD.
(4.) To ensure uplock crank remains in its proper position, maintainhydraulic pressure on the actuatorand pull both up lock rods out to full length. (5.) Adjust rod ends until the bolt can be freely inserted; turn them out one to three full turns. Installbolt and spacer and tighten locknuts on rod ends. (6.) Increase hydraulic pressure until cockpit handle moves to neutral. Gear must hand on up lock hook. Adjustgear up switch until red light in cockpit goes out.
NOTE: It is necessary to actuate opposite main gearswitch and nose gear switchalso to extinguishred light. Refer to 32-60-00for landing gear light switches.
(7.) Adjust outboarddoorrods to maximum length. Bolt themto door attachment fittings.
CAUTION: DAMAGEMAY RESULT TOTHE DOORS IF THE RODS ARE LEFT TOO SHORT.
(8.) Shorten rods by several turns of the rod ends. Retract gear again.
(9.) Repeat stepsg and h till door closed properly. (10.) Adjust inboarddoorsusing same procedure as outboard doors. (11.) Adjust safety switcheson left and right gear torque links so they actuate in the last 0.25 +
0.12 inch travel of the oleo. (12.) Operate gear through severalcycles to assure all parts are operating properly.
EFFECTIVITY:
PAGE
10 32=1n00
Jan 10/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. MainGearand Doors(continued)
5. Alignmentof MainLandingGear(referto 32-10-00 Figure503)
Thefollowingstepsmustbecompletedpriorto checkingand adjustingmainwheelalignment:
(a)
Ensurethe airplaneis parkedon a level surfaceandensurethatfull weightof airplaneison landinggear.
(b)
Rollairplanea minimumof two mainwheelrevolutionsusinga towbar. Moveairplanein a straightline, stabilizinglandinggearposition.
The remainingstepscoveralignmentprocedure:
(c)
Placea straightedgeno lessthan20 feet longacrossthe frontof bothmainlandinggearwheels. Buttthe straightedgeagainstthe tiresat the hub levelof landinggear. Ensurethe straightedgeisequallydistantfromtheforwardsideof the axle hubs. Devisea supportto hold straightedgein position.
(d)
Fabricatea spacerblock(usingdimensionsgivenin 32-10-00 Figure504) andplacespacer
blockagainstthe wheelrimat the hub linewith the wide endof the spacertowardsthefrontof thewheel.
NOTE: Thefabricatedspacerblockis laidout to givethe propertoe-inof 0.5 degrees.
Carpenters
Square
Fabricated
SpacerBlock
MainGearAlignment
Figure 503
EFFECTIVITY:
040-999 32-10-00JanJan10/90
PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Main Gear and Doors (continued)
1.10 I I
11.56
Material:
HardWood
1.10 x1 x 11.56
Main Gear Toe -In Adjustment Spacer Block Figure 504
5. Alignmentof Main Landing Gear (continued)
(e) Set a square against the straightedgeand spacer block. Ensure that the outstanding leg bears against the spacer block.
NOTE: A carpenter's square, because of its long legs, is recommended the main
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