indicated on the attitude indicator is resulting in level flight  as shown on the altimeter, VSI, and ASI. If the miniature  aircraft of the attitude indicator is properly adjusted on the  ground before takeoff, it shows approximately level flight at  normal cruise speed when the pilot completes the level off  from a climb. If further adjustment of the miniature aircraft  is necessary, the other pitch instruments must be used to  maintain level flight while the adjustment is made.  To practice pitch control for level flight using only the  attitude indicator, use the following exercise. Restrict the  displacement of the horizon bar to a one-half bar width, a  bar width up or down, then a one-and-one-half bar width.  One-half, one, and one-and-one-half bar width nose-high  attitudes are shown in  Figures 7-4, 7-5,  and  7-6 .  Pitch attitude changes for corrections to level flight by  reference to instruments are much smaller than those  commonly used for visual flight. With the airplane correctly  trimmed for level flight, the elevator displacement and the  control pressures necessary to effect these standard pitch  changes are usually very slight. The following are a few  helpful hints to help determine how much elevator control  pressure is required.  First, a tight grip on the controls makes it difficult to feel  control pressure changes. Relaxing and learning to control  the aircraft usually takes considerable conscious effort during  the early stages of instrument training.  Second, make smooth and small pitch changes with positive  pressure. With practice, a pilot can make these small pitch  corrections up or down, “freezing” (holding constant) the  one-half, full, and one-and-one-half bar widths on the  attitude indicator.  Third, with the airplane properly trimmed for level flight,  momentarily release all pressure on the elevator control  when becoming aware of tenseness. This is a reminder that  the airplane is stable; except under turbulent conditions, it  maintains level flight if left alone. Even when no control  change is called for, it is difficult to resist the impulse to  move the controls. This may be one of the most difficult  initial training problems in instrument flight.  At constant power, any deviation from level flight (except  in turbulent air) is the result of a pitch change. Therefore,  the altimeter gives an indirect indication of the pitch attitude  in level flight, assuming constant power. Since the altitude  An instructor pilot can demonstrate these normal pitch  corrections and compare the indications on the attitude  indicator with the airplane’s position to the natural horizon.  Figure 7-4.  Pitch correction for level flight, one-half bar width. Figure 7-5.  Pitch correction for level flight, one bar width. Figure 7-6.  Pitch correction for level flight, one-and-one-half  bar width. Figure 5-6. Pitch correction for level flight, three-bar width  7-3 Altimeter