Discussion
An aircraft descends at 700 feet per minute. In the 3 seconds a warning allows for response it descends
Answer: A
Correct answer: 35 feet
Convert the rate to feet per second and multiply by the response time:
\[ \frac{700}{60} = 11.7\ \mathrm{ft/s} \qquad 11.7 \times 3 = 35\ \mathrm{feet} \]
The point of the calculation is what a three second response allowance actually costs in height near the ground. On an approach, thirty-five feet is a substantial fraction of the remaining margin, which is why terrain warnings are timed to give the crew enough distance to arrest the descent, not merely enough to notice it.
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