What is the maximum permissible free play of the elevator trim tab given a chord length of 3 ft?

The maximum permissible free play of the elevator trim tab is determined by established regulatory standards and manufacturer specifications. For an elevator trim tab with a chord length of 3 feet, the allowable free play is typically a function of the control system design and stability requirements. In this case, a free play of 0.060 inches is consistent with the performance expectations for a trim tab of this size.

This value is crucial for ensuring that the trim tab operates effectively without excessive slack that could lead to control issues. Proper control surface response is vital for safe flight operations, and maintaining the trim tab within this specified tolerance helps to avoid potential aerodynamic disturbances.

In the context of the other options, greater free play (such as 0.100 inches) may impair the elevator's responsiveness, negatively affecting control accuracy and aircraft stability. Conversely, values like 0.040 inches or 0.020 inches might be too stringent, possibly leading to overly sensitive controls or premature wear. Therefore, the choice of 0.060 inches as the maximum allowable free play is well within acceptable limits for maintaining effective aircraft control dynamics.