1. The first step in rigging the aircraft is to determine the stall characteristics. This needs to be done by a skilled pilot who is very familiar with stalls and spins, since, IF the stall characteristics are not proper a spin entry is possible. The aircraft should be loaded near, but not exceeding the most aft CG limit and should be stalled in a power OFF clean (Gear and flaps UP) configuration. The purpose is to determine if there is unacceptable wing drop at the stall. Basically it should be possible to maintain within 15 degrees of level flight with normal, but full, use of the controls until the nose drops through the horizon in a stall. The stall should be approached very slowly at a deceleration of less than 1 Knot per second.

2. If a consistent and unavoidable wing drop is experienced, the first step is to attempt to correct it by lowering the flap on the side that drops to give that side a bit more lift (or raise the opposite side). Flaps should not be more that 1 ½ degrees difference from side to side. If wing drop cannot be corrected by this method it will be necessary to change the contour of the outboard leading edge of the wing(s) which is a highly technical process (Call Paul Furnee @ Aircraft Innovation for details). If stall characteristics are acceptable then proceed as below.

3. In level cruise flight, check for roll trim. Manually, (with your feet of course!) hold the ball in the center and bend the aileron trim tabs until the aircraft flies straight and level. Note that the tabs should be bent in the desired direction of roll trim. That is: if you need more right roll trim, bend the right tab DOWN and the left tab UP. Make sure the ball is centered with whatever rudder pressure it takes when trimming the ailerons.

4. Now trim out any rudder pressure by bending the fixed rudder tab with the moveable tab centered if so equipped. Note that the tab will need to be bent in the OPPOSITE direction from the trim direction desired. That is: bend the tab LEFT for right rudder trim.

5. Recheck the aircraft for stall characteristics and for straight and level flight. It may be necessary to repeat steps one through four. Note that the aircraft flight conditions should be at cruise at an airspeed and power setting normally used since trim conditions will vary slightly with power and airspeed used.

6. After you are satisfied with the flight trim, the position of the control wheel may be centered by adjusting the bell cranks at the aileron. Simply turn one inward and the other one outward until the control wheel is straight. The LA-4 ailerons should be lined up with the trailing edge of the wing. On the 250 models the ailerons should be 5/8" above the trailing edge of the wing. When changing the aileron bellcranks make certain sufficient thread length exists to be safe.