If a half standard-rate turn is maintained, how long would it take to turn 135°?

To determine how long it would take to turn 135° at a half standard-rate turn, it's essential to understand the concept of standard-rate turns in aviation. A standard-rate turn is defined as a turn that results in a change of heading of 3° per second. Therefore, a half standard-rate turn would equate to a change of heading of 1.5° per second.

To find out how long it would take for a half standard-rate turn to achieve a 135° turn, you would divide the total degrees to be turned (135°) by the rate of the turn (1.5° per second):

135° ÷ 1.5°/second = 90 seconds.

Since 90 seconds is equivalent to 1.5 minutes, the completion time of the maneuver aligns with the correct answer.

This helps illustrate why a standard or half standard-rate understanding is crucial in aviation turn calculations, contributing to safe navigation practices.