Piper Cheyenne IIIA Airplane Maintenance Manual page 810

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Elevator (continued)
7. Elevator Balancing Procedure (Figure 3)
(a) Remove complete elevator assembly (both halves) from airplane. Ensure individual elevator is
in final flight configuration, including trim tab and any related components.
(b) Place hinge bolts through inboard and outboard hinges. Place elevator on balancing jig.
(c) Avoiding rivets, place balancing tool on elevator with hinge centerline directly over control
surface hinge line.
(d) Adjust moveable trailing edge support to fit control surface width. Tighten set screw on trailing
edge support.
(e) Adjust trailing edge support vertically until beam is parallel with elevator chord line.
(f) Remove tool from elevator. Balance tool by adding or removing nuts or washers from beam
balancing bolt. When balancing tool, moveable weight must be at bar's hinge centerline.
(g) After balancing tool, reattach to elevator. Keep beam position 90
°
from elevator hinge line.
(h) Determine balance of elevator by sliding moveable weight along balance beam. Verify that
weight is positioned between limits (0 +0/ -2 in.-lbs leading edge heavy).
NOTE: Read scale when bubble in level is centered. Since moveable weight weighs three
pounds, every inch it moves from center of beam equals three inch-pounds of force. If
elevator is trailing edge heavy, determine and correct cause of imbalance.
(i) If elevator is leading edge heavy, remove material from balance weight until acceptable
balance conditions exists.
() With balance check completed, install elevator assembly on aircraft as explained in this
chapter.
Tape Trim Tab Level With Elevator
Balance Jig Center Line
Line
Refer to Control Surface Balancing Tool
Elevator Balancing
Figure 3
EFFECTIVITY:
55-20-00
Jan
10/90
Hinge