Discussion
At a density ratio of 0.30, an aircraft indicating 250 knots calibrated airspeed has a true airspeed of about
Answer: D
Correct answer: 456 knots
\[ V_T = \frac{V_C}{\sqrt{\sigma}} = \frac{250}{\sqrt{0.30}} = \frac{250}{0.5477} = 456\ \text{knots.} \] A density ratio of 0.30 corresponds to roughly 30 000 ft, where the true airspeed is nearly twice the indicated value - a difference large enough that navigating on the indicated figure would put the aircraft badly out of position.
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