11.
After adjusting trim tab travels, check cable wraps on trim drums at each end of travel. Minimum
allowableis 1 1/4 wraps. Install fairleads so they do not cause a change in direction of more than 3°
.
12. Installpulleys so they do not cause a change in cable direction of more than 1 laterally (primary controls)or 20 laterally (trimsystem).
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PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
B. Standard Procedures (continued)
CHART 1 CABLE RIGGING TENSION VS. TEMPERATURE
200
170 150
Z
50
20 RIGGINGLOADCORRECTION,POUNDS SUBTRACT ADD
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PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
C. Wrappingof Trim Drums
NOTE:Thefollowinginstructionsprovidegeneralizedinstructions.Forspecificrequirements
asto numberandpositionofcablewrapsondrum,refertoappropriatetrimriggingprocedure.
Alltrimdrums,wrappedbasicallythesame,mustberemovedfromtheairplaneasfollows:
1.
Forreference,markendof drum towardbaseof housing bracketwhenlaterinstallingand wrappingcableondrum.
2.
Withdrumhousingbracketheldfirmly,removeoneofthecableguardboltsfromhousingbracket.
3.
Removedrumscrewordrumshaftfromtrimscrewassembly.Removescrewbyremovingstoplocatedonendofscrewoppositebaseof housing bracket.Turnscrewfromdrum.Removeshaft bydrivingrollpinfromcenterofdrum.Pressshaftfromdrum.
4.
Removedrumfromhousing.
5.
Unwraptrimcableandremovecableandlockpinfromdrum.Ifoneendof cable is marked to facilitatehookupofcableends,note location in relation todrumwheninstallingnewcableon drum.
6.
Checkconditionof bushing in housing bracketforexcesswear.
7.
Toinstallandwraptrimcable,locatecenterofcable,measuringfromendto end.
8.
Insertcenterof cable intocableslotindrum;installlockpin.
9.
Holddrumwithpreviouslymarkedorbaseendof drum down.
10.Lookingdownon drum, wrapcableleadingfrombase end up inacounterclockwise
direction. Wrapcablefromupperenddownin aclockwisedirection.
11.Insertdruminhousingbracket,positiondrum,androutecablesfromassemblyasshowninFigure1.
12.
Installscrewandscrewstopor drum shaft. Securewithrollpin.
13.
Blocktrimcablesincenterpositionusingmethodshownin Figure2.
14.
Centerdrumbetweenstopson screwbyrotatingscrew.
ScrewStop
DrumScrew
Bushing
Drum Drum Housing Bracket
Roll Pin Cable Lock Pin
Bushing Cable
LockPin Bolt Attachment
Housing Guard Nuts
BracketBase
ScrewStop
TrimScrewAssembly Figure 1
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PIPER AIRCRAFT PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
C. Wrappingof Trim Drums (continued)
Methodsof Blocking Trim Cables
Figure 2
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PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
D. Special Tools
ElevatorRiggingTool
Aileron Rigging Tool
Tool P/N 71505-2 P/N 71505-3
Rudderand Rudder Trim Rigging Tool
Flap Rigging Tool
Tool
P/N L-72233
Rudder Pedal Rigging Tool
SpecialTools
Figure 501
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Jan 10/90 PIPER AIRCRAFT
PA-42-720(Advanced Tralner) MAINTENANCEMANUAL
D. Special Tools (continued)
0.500AND0.562 Sockets needed to cover two size jam nuts on dots Cut through the disc and socket to permit it to slide overthepot shaft
Weld -0.187OR 0.250 steel disc Holes Holes drilled in disc for small punchtypeobject to assist in tightening thejam nut on pot TOP VIEW 0.250
FabricatedCalco Flap Potentiometer InstallationandAdjustment Tool
SpecialToolsfor Calco Flaps
Figure 502
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PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCE MANUAL
D. SpecialTools(continued)
3 lb movable weight with marked centerline
as required o balance tool itself
Surface Chord Line
-Beambalancing
bolt (used for
balancingthe tool itself once the trailing edge support has been set)
MarkGraduationsin inches Hinge centerline placed directly over hinge line of control surface
Horizontally Adjustable for setting tool to width of control Bubble Level
surface
Set Screw
Verticallyandhorizontally
adjustable trailing edge support Vertically adjustable for setting beam parallel chord line of control surface
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