(e)
Lubricate and install O-ring (MS 28775-010) on bottom of plunger and O-ring (MS 28775-008) on top of plunger.
(f)
Install plunger and lubricated spring into manifold.
(g)
Lubricatethreads of retainer, install into manifold, torque to 25 inch-pounds,and safety wire retainerto manifold.
24. Disassembly Mechanism(Figure 406) of Power Pack Handle Release
(a)
Removelockwireretaining roll pin in input shaft and arm.
(b)
Usinga punch, drive roll pin out of arm and shaft. Removearm.
(c)
Usinga punch, drive pin out of return cam. Remove return cam.
(d)
Pull input shaft assembly frompower pack.
25. Assemblyof Power Pack Handle Release Mechanism.(Figure 406)
(a)
Ifswitch cam, gear, and detent cam were removedfrom input shaft, parts must be assembled and indexed (Figure 406, View A).
(b)
Lubricateinput shaft, slide detent cam and gear into place, and secure gearwith roll pin.
(c)
Slideswitch cam onto input shaft; secure withroll pin. Install assemblyinto power pack body.
(d)
Installreturncam and secure with roll pin. Ensure landing gear shaft moves freely in power pack body. Check for slight end play betweeninput shaft and power pack body. If shaft binds, removereturncamlap face of returncam boss; reinstall returncam.
(e)
Installpower pack control arm on shaft end with arm pointing down. Align holes between shaft and arm assemblyand install roll pin. Install0.041 inch safety wire throughroll pin and around halfof arm. Pull twisted end of safety wire aroundother half of arm assembly (Figures 407).
EFFECTIVITY:
Jan 10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Main (continued)
3. Gear
5. Cam Detent -11. Lockwire
-9. Arm
1. Cam Switch
-8. Pin
View A
7. Return Cam — 6. Shaft Input
Detent
ShaftInputAssembly
Power Pack Handle Release Mechanism
Figure 406
MS20995C41 Safety Wire-
SafetyingControlArms
Figure 407
EFFECTIVITY:
040-999
Jan 10/9029-10-00
PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. Main (continued)
26. Adjustment of Power Pack Handle Release Mechanism (Figure 501)
The following procedure outlines adjustments for setting handle release cartridges, stopping them in correct position before installing power pack into airplane.
(a)
Rotate input shaft into gear UP detent position. Adjust left stop screw to allow slight overtravel past detent position.
(b)
Rotate input shaft into gear DOWN detent position. Adjust right stop screw to allow slight overtravel past detent position.
(c)
Rotate input shaft to neutral position, bringing input shaft return cam to horizontal position.
(d)
Hold input shaft return cam in horizontal (neutral) position by inserting 0.125 inch diameter drill or punch through hole in arm and into rigging hole in body. (Rigging hole A, Figure 501.) Adjust handle return cartridges so return plunger balls barely touch surface of input shaft return cam.
CAUTION: REMOVE DRILL OR PUNCH FROM RIGGING HOLE A.
(e)
Ensure detent holds in both detent positions and returns with a positive snap when manually released from either position.
9. Stop Screw
2.
Cam in Horizontal Position (Neutral)
8. Return Plunger Ball Hole"A'
7. Handle Return Cartridge
Handle Release Adjustment
Figure 501
EFFECTIVITY:
040-999
PAGE 19
29-10-0 Jan 10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Main (continued)
27.Operationof Gear Selector Handle Mechanism.(Figure 408)
Operatinggearselector handle must accomplishpositiveengagementwithdetent. With selector handle in UP or DOWN position and in detent, a force of 3 1/2 to 6 pounds, applied perpendicular to handle centerlineat knob centerline, is required to move handle from detent back to neutral position. To check operation of gear selector handle mechanism, place airplane on jacks (refer to 7-10-00)and operate gear selector handle through entire up and down travel.
15. Safety Wire
8. Pin, Washerand
Cotter Pin Terminal .10. Mounting Block
7.
r-1 1. Solenoid
6.Stop Pin
5. Sleeve
4. Control Knob 14 . Bracket Assembly 18.Grommet
3. Plate Assembly
2. Light Assembly 17.FirewallPlate
1. Panel Assembly
15.SafetyWire
16.Bushing
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