Piper Arrow IV, Maintenance Manual

Page: 271 / 752

INSTALLATION OF STABILATOR TRIM ASSEMBLY. (Aft) (Refer to Figure 27-18.)
1. Wrap the trim barrel by first laying the center (as measured equally from each end to the center of the
cable) of the trim cable in the slot of the barrel. Bring the upper cable through the diagonal slot in the flange at
the upper end of the barrel and wrap down in a counterclockwise direction. Bring the lower cable through the
diagonal slot in the lower end of the barrel and wrap up in a clockwise direction. Wrap the cable as evenly as
possible to obtain 14 wraps on the barrel as viewed from the side opposite the slot and with the cables
extending out from the slotted side.
2. Block both cables by clamping them between two pieces of wood laid next to the wraps to prevent
them from unwrapping.
3. Ascertain that the barrel bushings are installed in the rib plate and clip.
4. Lubricate the bushings and install the trim barrel in the bushings between the two support ribs. Attach
the bottom diagonal rib to horizontal rib and secure with bolt, washers and nuts.
5. Install the thrust washer, washer and snap ring on the lower end of the barrel.
6. Install the trim screw in the barrel and secure each end with a cotter pin through the screw.
7. Route the cables into the fuselage and attach the ends to the forward trim cables.
8. Remove the blocks that are holding the forward cables tight and aft cables at the barrel.
9. Set cable tension and check rigging and adjustment per Rigging and Adjustment of Stabilator Trim.
Check safety of all turnbuckles.
10. Install the fin/rudder fairing and secure with screws.
11. Install the access panel to the aft section of the fuselage.
RIGGING AND ADJUSTMENT OF STABILATOR TRIM. (Refer to Figure 27-18.)
1. Level the airplane. (Refer to Leveling, Chapter 8.)
2. Check for proper stabilator trim cable tension as given in Figure 27-15. If cables were disconnected,
rotate control wheel several times to allow the cables to seat and recheck tension.
3. Secure the stabilator in neutral position. To find neutral, place a rigging tool on the upper surface of
the stabilator as shown in Figure 27-16. Zero a bubble protractor, set it on the rigging tool and tilt the stabilator
until the bubble is centered.
4. With the stabilator centered, and locked with a suitable tool, place the stabilator trim control in the
neutral position and adjust the stabilator tab push rod to streamline the tab with the stabilator. This is neutral
position of the tab.
5. Turn the trim control to its full up and full down position alternately. Travel of the tab from its neutral
position is shown in Figure 27-15.
6. To obtain correct travels, if incorrect, adjust by disconnecting the links at the actuating arm rod end
and turning the end in or out as required. Reconnect links to rod end.
7. Secure the jam nut on the actuating arm rod end.
8. Turn the trim wheel to full travel and check for turnbuckle clearance and location of tab indicator.
9. With the stabilator and trim in all extremes of travel, and with control wheel pulled or pushed to
secondary stops, check to insure that there is no interference between turnbuckles and pulleys.
10. With the stabilator held securely against either stop, determine the free play of the stabilator tab. Total
free play, measured at the tab trailing edge, shall not exceed 0.06 inches.
27-35-05
Page 27-36
Revised: February 23, 1979
1L7
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL