夏延飞机维护手册 Cheyenne IIIA PA-42-720 AMM 2(115)

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beingbalancedmustbe removed from aircraftandplacedin a test fixture (jig) shownin 55-20-00 Figure 3 and 55-40-00Figure2. Balancing must be accomplishedin a draft free area and in a manner which allowsunrestrictedmovementof controlsurface.
(c) BalancingDefinitions
Thefollowingis a list of balancing definitions usedin this maintenancemanual:
(1.) BalanceWeight: Weight attachedpermanentlyto a control balance to produce a static hingemomentwithinrequiredrange. (Such as 30 inch-pounds+ 10 inch-pounds trailing edge heavy.)
(2.) Trailing Edge Heavy: Positivestatichingemoment; trailing edgeof surfacemoves downwardwhenreleasedfroma neutral position. (3.) LeadingEdgeHeavy: Negative statichingemoment;leadingedge of the surface moves downwardwhen releasedfromneutral position. (4.) TrimWeight: Small weightor weights addedto surface balance weight to bring surface withintolerances.(Requireddependingon variations in surface conditions.) (5.) Test Weight: Weightattached temporarily to a control surface to determine if surface is withinstatic balance limits.
EFFECTIVITY:

040-999
55-00-00PAGE1
Jan 10/90
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL

A. HorizontalStabilizer
1. HorizontalStabilizerRemoval (Figure1)
(a)
Removebulletassemblyfromtopof vertical fin.

(b)
Removeleftandrightelevator,hingetube,andtrimtab assemblies. (See27-00-00)

(c)
Disconnectall affective lines,groundstraps,andfittingsrequiredfor removal.

(d)
Drilloutrivets securing lowerdragangleto stabilizer andfin.

(e)Withsupportonbottomof both sidesof stabilizer, removesix bolts attachingfrontsparof verticalfin and sixmoreattachingrearspartoverticalfinrear spar.
(f) Carefullyliftstabilizerup and out of tail.
2. HorizontalStabilizerInstallation(Figure1)
(a)
Positionstabilizerat top of vertical finwith front sparbehindfin front spar and rear sparbehind fin's rear spar.

(b)
Lineupfixture holes andinstallretainingbolts.With holes aligned,torquebolts.

(c)
Reinstallhinge tube and elevatorsasshownin this chapter.

(d)
Reinstallandconnectall lines, groundstraps,andfittings.

(e)
Rerivetlowerdragangleto stabilizerandfin. (Refer to latestPiper S/B 765.)

(f)
Reconnecttrimtabmechanism.

(g)
Checksystem friction iswithinlimits.

(h)
Checkforfull travel of elevatorandtrim tab.

(i)
Reinstallbulletassembly.

NOTE: Tailfin, fuselage drag angle, andtailfin front sparcan begin to loosen afterseveral hundredhoursof operation. Instructionsfor replacement andadditionofrivets is foundin the latest Piper Service Bulletin,No. 765.
EFFECTIVITY:
040-999 55-10-00 Jan10/90
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. HorizontalStabilizer (continued)
EmpennageInstallation Figure1 (Sheet1of 2) 
EFFECTIVITY: 
040-999 
Jan 10/90 55-10-00 

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUA

A. HorizontalStabilizer(continued)
View A View B Fin Front and Rear Spar Fitting InboardElevator Hinge Point
View C View D
CenterElevator Hinge Point Outboard Elevator Hinge Point
Empennage Installation
Figure 1 (Sheet 2 of 2)

EFFECTIVITY:
040-999
55-10-00
PAGE 3
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL

A. Elevator
1. Elevator Removal (Figure 1)
(a)
Remove bullet assembly from top of vertical stabilizer.

(b)
Disconnect trim tab control rods from both tabs.

(c)
Remove four bolts attaching each hinge tube collar to its elevator.

(d)
Disconnect ground wires between stabilizers and elevators. Carefully remove hinge pins to remove elevators.

(e)
To remove elevator hinge tube assembly, proceed as follows:

NOTE: Though not mandatory, it is suggested that whenever a hinge tube or collar needs replacing, a matched set consisting of the hinge tube and right and left collars should be used to satisfy a required close tolerance fit.
(1.) Disconnect aft elevator push-pull tube from elevator control horn.
(2.) To remove hinge tube assembly, remove two screws on inner flange and two bolts on each hinge at top and bottom of horizontal stabilizer rear spar; remove assembly.
2. ElevatorInstallation(Figure 1)
(a)
Mount hinge tube assembly onto aft horizontal stabilizer spar with control horn arm and down stop up. (Shown in Figure 1.)

(b)
With two inner flanges of hinges on inside of brackets, install four screw-bolts.

(c)
Install four bolts through four main hinge mounts. Torque bolts.

(d)
Line up each elevator with its hinges. Install three hinge bolts.
　
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