BALANCE LINE
6.21 IN.AFT OF HINGE LINE

JIG KNIFE
EDGE

LEVEL BALANCE JIG
CENTER TEST WT. 2.47 LINE LB TO 3.00 LB

Aileron Balancing 
Figure501 
EFFECTIVITY: 
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PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCE MANUAL

CHAPTER 61

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PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

CHAPTER61 -PROPELLERS

TABLEOF CONTENTS

SUBJECT CHAPTER PAGE

61-00-00 Propeller
1

DescriptionandOperation 1
61-10-00

Removalof Propeller 1 Installationof Propeller 2DynamicBalancingof Propellers 4Cleaning,Inspection,and Repairof Propeller 4
61-20-00

Controlling 1Removalof PropellerConstantSpeedGovernor 1Installationof PropellerConstantSpeedGovernor
1 ConstantSpeedGovernorAdjustments 1Removalof Overspeed Governor
2Installationof OverspeedGovernor 2OverspeedGovernorOperationalChecks 3AutofeatherSystem 3AutofeatherSystemOperation 3AutofeatherGroundOperationalCheck 4

AutofeatherElectricalSystemGroundChecks
4 PropellerSynchrophaser System 5
SynchrophaserWiringTest 7
SynchrophaserFunctionalTest 8
ControlBox
9

Removalof ControlBox 9
Installationof ControlBox 9
MagneticPickup 9
Removalof MagneticPickup 9
Installationof MagneticPickup 9
EFFECTIVITY:
040-999
CONTENTSJan

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL

Propeller
A. Descriptionand Operation
The propeller installations are constant speed, full feathering, reversing type, controlled by engine oil pressurethrough single action propeller governors. Centrifugal counterweights assisted by a feathering spring move the blades toward the low rpm (high pitch) position and into the feather position. This movement is opposed by oil pressure controlled by the propeller governor. Oil pressure moves the propeller to the high rpm (low pitch) hydraulic stop and reverse position. The propellers have no high pitch stop, this allows them to feather after engine shutdown.
EFFECTIVITY:

040-999
61-00-00 Jan 10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL

A. Removal of Propeller (Figure 401)
TORQUESEQUENCE

Ring
Lever

'A 'B'
BlockAssembly
AssemblyPropDeicer

EngineMountingFlange

SECTIONA-A 0-Ring Slip RingAssembly(Deicer) FlexLocknut SpinnerBulkhead
Piston Nut
Ring,RodEnd BetaNuts-
LowStop Rods -
Spring,ReverseReturn
Propeller
Figure 401

EFFECTIVITY: 040-999
61-10-00Jan 10/90

PIPER AIRCRAFT PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Removalof Propeller (Figure 401) (continued)
1.  
Use index marks to identify relationshipof spinner and spinner bulkhead, beforeremoving attachmentscrews.(Refer to Dynamic Balancing of Propellers.)

2.  
Removeenginecowling.

3.  
Removedeicer brush block assembly. Avoid damaging brushes.

4.  
Disconnectand remove propeller reversing leverand carbon block from feedback ring. CAUTION: DO NOT DAMAGE LOW STOP RODS AND FEEDBACK RING.

FeedbackRing Pulley Installation
Figure 402

5.  
Install feedback ring puller (P/N 51519). Pull feedback ring fully forward. Use standard 5/8 inch socketagainst propeller hub. (Figure402)

6.  
Removesafetywire from propeller mounting bolts and remove bolts.

7.  
Placedrip pan under propeller for oil spillage.

8.  
Remove propeller from engine flange. Remove O-ring and cap flange to prevent contamination.

B.  Installationof Propeller (Figure 401)
CAUTION: AVOID DAMAGING LOW STOP RODS AND FEEDBACK RING.
1.  
　
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