(f)
At pulleys on bottom of pressure bulkhead and on aft canted bulkhead, remove cable guide pins and block cables on aft screw drum.
(g)
Removecable blocks at F.S. 332.0 and bolts retaining screw drum to canted bulkhead. Carefully remove drum.
(h)
Carefullypull cables out tail and disconnectleader lines, noting which lines are attached to which cables, respective to trim drum in its mounted position.
14. Installationof Aft Rudder Trim System (Figure 401)
(a)
Ensure appropriate cable is centered, evenly wrapped on drum (explained on paragraph entitledWrapping of Trim Drums), and blocked to prevent unraveling.
(b)
Position screw drum assembly on canted bulkhead. Mount with two bolts and required washers.
(c)
Attach cable terminal ends to leader lines and from inside cockpit at F.S. 313.0. Carefully and slowlypull cables through fuselage. Remove leader lines from cables when cables are in fuselage.
(d)
Ensurecablesare properly centeredon pulleys.
(e)
Attache cable to proper turnbuckles. Tighten and rig system to specifications in Figure 501.
EFFECTIVITY:
27-20-00
Jan 10/90
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. Rudderand Tab (continued)
15. Removalof Trim Tab
(a)
Removefairing/accesscoverswherecablescomethroughrudder.
(b)
Loosencabletumbucklesandremovecablesecuringfixtureson trim tabsectors.
(c)
Removehingeboltsandtab.
16. Installationof Trim Tab
(a)
Verifythatcablesarereriggedbeforeinstallingfairing/access
covers.Installhingeboltsand tab
(b)
Installcablesecuringfixtureson trim tabsectorsandtightencabletumbuckles.
(c)
Installfairing/accesscoverswherecables come throughrudder.
17. Riggingof RudderTrim (Figure501)
(a)
Beforeadjustingruddertrim, proceedas follows:
(1.) Ensurecablesarecenteredand evenlywrappedon trim drums. (2.) Remove rightsidefloor panelsbetweenF.S.310.0and321.0. Ensurecableturnbuckles are near F.S.312.3. (3.) Checkcabletension(Figure501).
(b)
Removetail cone(stinger)andaccessplateon ruddernearWaterLine45.0.
(c)
Disconnectrodend fromtrim tube arm so trim screwis free to rotate.
(d)
In cockpit, centercontrolat neutraland ensuretrim drumunderfloor is in neutralposition.Forwarddrumcablecapacityis 18 1/2 turns, and whensetwith systemin neutral,2 1/4 turnsof eachsideof cable mustbe wrappedon drum.
(e)
With systemin neutral, ensureaftscrewdrumin tail alsohas 9 1/4turnsof cablewrappedon eachsideof drum.
(f)
On aft trim drum, measuredistancefrommachinedsurfaceof drum assemblyto stop washer on screw. (Endof screwwith rod endattached.) Distancemustmeasure0.625inches. Screw rodassemblyin or outfor propermeasurement.
(g)
With trim screwand systemin neutral, alignrodendwith trimtube arm,and insertboltto set and holdtab position. Trailingedgesof tab and rudder mustalign. If control surfacesdo not align, pullboltout of arm and rodend andturn screw shaftin or out until tab aligns. Forfine
adjustments,useturnbuckles.
(h)
Installand secureattachmentboltin rod end; trim tubearm.
(i)
In cockpit,turncontrolto each stop and measureanglesof deflection fromcenterlineof rudder. Measurementsmustcompareto thosein Figure 501. Use riggingtool (Figure 503)to check tab angles.
(j)
After adjustingsystem,turn controlto its stops and ensureno lessthan 1 1/4 turns of cableis left on eitherdrum.
(k)
Usingtool(L73035)anddial typetorquewrench,checktrim system frictionat pedestalbyremovingtrim wheeland attachingtooland torque wrenchto splined shaft. Frictionmustnot exceed9 inch-pounds whentestedin eitherdirectionat any point betweenlimits.
EFFECTIVITY: 040-999
PAGE10 27-20-00 Jan10/90
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Rudderand Tab (continued)
18. Removalof RudderPedalAssembly(Figure402)
(a) Removepilotandcopilotseatsforeasieraccesstopedals.
NOTE:If bearing supporthousingand bearings on endof tubes are only required serviceable items,proceedto step (f).
(b)
Disconnectbrakecylindersfromrudderpedal clevis armsand support bracketsso brake cylinderassemblies(brakecylinderand extension) remainassembled.If removing eitherof copilotpedals,disconnectbrakecylinderfor left pedalat rudder pedalclevisarmand extension.Removeextensionwithrightrudder pedal orforwardtubeassembly.
(c)
Usethefollowingprocedureto remove leftpedals(afttubeassembly)onpilotandcopilotside:
(1.) Removeboltsattachingpillowblockcapsto housingsandremovetwo bolts onright side of block mountingbracket.After removing caps,reinstallbolts in left block. (2.) Removetwobolts,attachingtubesupportassemblyon pilot sidetobracket, mounted on
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