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Marilu Lukaszewski
Precisely flying an airplane with an appreciable freeplay band is difficult, and with a decrease in precision comes an increase in pilot workload. For example, in formation flight pilots constantly make small adjustments to stay in position. If the control system freeplay exists, pilots must continually experiment with stick position within the band to make the desired adjustments, a tiring increase in their workload.
Freeplay does not involve control forces. When you move the stick within the freeplay band, the stick force changes. As you displace the stick, the force increases until it reaches the breakout force. The breakout force (the minimum force needed to make the airplane respond) is reached at the end of the freeplay band, where the control surface deflects and the airplane responds.
You can use the tape measure technique described for freeplay measurements, but again, this might not be necessary. For reasonably small centering bands, the important thing is the centering band size relative to the freeplay band.
Spontaneous language samples elicited during freeplay and interview contexts were compared for 10 children who were specifically language impaired (SLI). Clinician-child videotaped interactions were analyzed for both structural and conversational behaviors. The results indicated that the interview was a reliable and valid assessment context, eliciting the same profile of behaviors as the freeplay context without altering diagnostic classifications. Most behaviors occurred significantly more often during the interview than during the freeplay context, indicating further that interviews are an efficient language sampling alternative for assessment purposes with elementary school-aged children with language disorders.
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