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Bank Control (Part Four) Turn-and-Slip Indicator (Needle and Ball)

in Airplane Basic Flight Maneuvers - Analog Instrumentation

Unlike the turn coordinator that provides three indications (roll, turn, and trim), the turn-and-slip indicator provides two: turn-rate and trim. Although the turn-and-slip indicator needle provides an indication of turn only, it provides an indirect indication of aircraft attitude when used with roll indicators, such as a heading indicator or magnetic compass. As with the turn coordinator (after stabilizing from a roll), when the turn-and-slip indicator’s needle is aligned with the alignment marks, the aircraft is in a standard turn of 3 degrees per second or 360° in 2 minutes.

The ball of the turn-and-bank indicator provides important trim in the same manner that the ball in the turn coordinator does. Figures 7-18 and 7-19 provide a comparison of the two instruments.


Figure 7-18. Skid Indication

Figure 7-18. Skid Indication

Figure 7-19. Slip indication.

Figure 7-19. Slip indication.

 

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