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PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. Controlling (continued)
14. ControlBox
The controlboxis anelectronicdevicewhichreceivesandcompareselectricalsignalsgenerated by magneticpickups. Whena speeddifferenceexistsbetweengovernors,a varyingvoltage producedby the controlboxchangesthe magneticbiason eachgovernorspeedsettinguntil enginerpm'smatch.
NOTE:Thecontrolbox,whichis not repairable,is encapsulatedin a cushioningmaterialto protectagainstvibration.
(a) Removalof ControlBox
(1.) Gain accessto inboardsideof leftinstrumentpanelsupportweb.
(2.) Unscrewconnectorfrom controlbox.
(3.) Removetwo screwsand liftout.
(b) Installationof ControlBox
(1.) Set controlboxintopositionon bottomclip.
(2.) Attachtwoscrews.
(3.) Screw in connector.
15. MagneticPickup
CAUTION: DONOTHAMMEROR JARMAGNETICPICKUPS.DOINGSOWILLDECREASE THESTRENGTHOFTHEMAGNET.
The magneticpickupis installedon a bracketwhichis attachedto the brushblockassembly.
(a)
Removalof MagneticPickup
(1.) Removesafetywire.
(2.) Disconnectwiringto magneticpickup.
(3.) Loosenjam nut
(4.) Removemagneticpickupfrombracket.
(b)
Installationof MagneticPickup
(1.) Screwjamnutonto magneticpickup.
(2.) Screwmagneticpickupintonuton bracket. Obtaina gap of 0.050inchbetweenmagnetic
pickupandtarget.
(3.) Tightenjamnutto 160to 190in. lb.
(4.) Connectwiringto magneticpickup.
(5.) Securewithsafetywire.
(6.) Testfor propervoltageoutput(referto Chart3).
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PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. Controlling (continued)
15. MagneticPickup (continued)
CHART 3 MAGNETICPICKUPVOLTAGEOUTPUTTEST
NOTE:AC voltage is produced by one target onflyweighthead.Do not interpretpeakto peak voltage withany rms readingvoltmeter.
TEST BETWEEN OSCILLOSCOPEONLY
RECEPTACLENUMBER RPMSETTING VOLTS AC PEAKTO PEAK
D and E CRUISE 3 Vac -Peakto Peak
CandG
D and E MINIMUMCRUISE NOT LESS THAN 2 Vac
C and G Peak to Peak
D and E MAXIMUMCRUISE NOTMORETHAN10 Vac
C and G Peakto Peak
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PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
CHAPTER 71
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CHAPTER SECTION PAGE DATE
LIST OF EFFECTIVE PAGESApr 15/91
SUBJECT
Power Plant DescriptionandOperation Fault Isolation EngineRemoval Engine Installation Engine Buildup
Cowling Removal of Cowling Installation of Cowling
Cleaning, Inspection, and Repair of Cowling Mounts Replacementof Shock Mounts Fireseals
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
CHAPTER 71 -POWER PLANT
TABLEOFCONTENTS
CHAPTER PAGE
71-00-00 1 1 1 7
8
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CONTENTS Jan
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
Powerplant
A. Description and Operation
Themaintenanceconcept of this chapter is supplemental to the Pratt & Whitney PT6A-61 Engine Maintenance Manual and consists of removal, installation, and adjustments of external components and engine accessories.Repairs beyond this level should be accomplished by an approved Pratt & Whitney of Canada Limited overhaul facility.
In the interest of maintaining efficient engine performance,an engine condition trend monitoring systemhas been set up by Pratt & Whitney. This is not a mandatory procedure, but is highly recommendedby Pratt & Whitney and Piper Aircraft Corporation. Theuse of this procedure will establisha means by which the engine condition can be observed withoutactual tear down of components,until conditions warrant it.
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