Stabilator Controls Rigging And Adjustment - Piper PA-44-180 SEMINOLE Maintenance Manual

RIGGING AND ADJUSTMENT OF STABILATOR CONTROLS
1. To check and set the correct degree of stabilator travel, the following procedure may be used:
A. Level the airplane. (Refer to Leveling, Chapter 8.)
B. Place the stabilator in neutral position. Neutral position is obtained when a level placed on stabi-
lator rigging tool (Figure 27-19) indicates that stabilator chord line is parallel with the top of the
front seat tracks.
C. Check the stabilator travel by placing a rigging tool on the upper surface of the stabilator as
shown in Figure 27-19. (This tool may be fabricated from dimensions given in Chapter 91.)
D. Set on a bubble protractor the number of degree up travel as given in Figure 27-19 and place it on
the rigging tool. Raise the trailing edge of the stabilator and determine that when the stabilator
contacts its stops the bubble of the protractor is centered.
The stabilator should contact both of its stops before the control
wheel contacts its stops.
E. Set on the protractor the number of degrees down travel as given in Figure 27-19 and again place
it on the rigging tool. Lower the trailing edge of the stabilator and determine that when it contacts
its stops, the bubble of the protractor is centered.
F. Should the stabilator travel be incorrect in either the up or down position, remove the fin tip by
removing the attachment screws and with the use of the rigging tool and bubble protractor turn
the stops located at the stabilator hinge in or out to obtain the correct degree of travel. (Refer to
Figure 27-20.)
G. Ascertain that the locknuts of the stop screws are secure and then reinstall the fin tip.
2. To check and set stabilator control cable tension, the following procedure may be used:
A. Ascertain that the stabilator travel is correct.
B. Remove the access panel to the aft section of the fuselage and fin tip and disconnect the assist
springs from bulkhead sta. 156.
C. Secure the control column in the near forward position. Allow one-quarter inch +/- .031 between
the column and the stop bumper.
D. Check each control cable for the correct tension as given in Figure 27-19.
E. Should tension be incorrect, loosen the turnbuckle of the lower cable in the aft section of the fuse-
lage and adjust the turnbuckle of the upper cable to obtain correct tension. Cable tension should
be obtained with control wheel at the one-quarter inch dimension from the stop and the stabilator
contacting its stop.
F. Check safety of all turnbuckles and bolts.
G. With the tension of the upper cable correct and the control wheel still forward, adjust the turn-
buckle of the lower cable to obtain correct tension.
H. Check the full travel of the control wheel with relation to the full travel of the stabilator to deter-
mine that the stabilator contacts its stops before the control wheel contacts its stops. With the
control wheel in the fore and aft positions, the travel distance from the joint where the stabilator
contacts its stops and the control wheel contacts its stops should be approximately equal.
Readjust turnbuckles if incorrect.
I. Connect the assist springs to bulkhead sta. 156. (Refer to- Figure 27-18.)
J. Install access panels and fin tip.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— NOTE —
1L12
PPS50033
27-30-02
Page 27-34
Revised: June 20, 1995