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T-34C CONTACT
CHAPTER THREE
aileron trim tab in the direction you are applying stick pressure. For example, if you must hold
in right stick (the aircraft wants to roll left), roll the aileron trim wheel to the right. Generally
speaking, once the aileron trim is "fine-tuned," you may not have to retrim the ailerons for the
remainder of the flight.
4.
Trim Requirements-Rudder/ Elevator
Acceleration............LEFT/DOWN
Power Addition........RIGHT/DOWN
Deceleration............RIGHT/UP
Power Reduction......LEFT/UP
The trim diagram (Figure 3-3) should help you understand which way to trim when airspeed and
power changes occur. However, the trim requirements must be committed to memory before
your first flight, because you will not have the time to stop and think through the trim diagram.
The center of the diagram represents equilibrium for whatever level flight condition you are
trying to maintain. When airspeed is increased (with power unchanged), we see from the trim
diagram that left rudder trim is needed and down elevator trim is needed. If power is unchanged
and airspeed is reduced, we see from the trim diagram that right rudder trim and up elevator trim
is needed. If airspeed is constant and power is increased, then right rudder trim and down
elevator trim is needed. If power is reduced with airspeed constant, then left rudder trim and up
elevator trim is necessary.
Down Elevator
Right
Left
Rudder
Rudder
Up Elevator
Figure 3-3 Trim Diagram
The four trim requirements outlined in this section are basic rules. However, many situations
during a flight combine two of the "rules" simultaneously. For example, when initiating a 120-
KIAS climb from normal cruise (150 KIAS, level), you will add power, raise the nose and
decelerate.  In this case, right rudder trim is required for both the power addition and
deceleration. However, the elevator trim will be nose UP, because deceleration requires a
greater amount of nose up trim than the addition of power will require nose down. The resultant
or net force is trimmed for equilibrium. More on this later......
USE AND EFFECT OF CONTROLS 3-7


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