Answer :
According to the Federal Aviation Regulations, a crewmember's maximum allowable flight time is 100 hours within 672 consecutive hours (28 days) and 1000 hours within any 365 consecutive calendar day period - options a) and d) respectively.
The question appears to be enquiring about flight time limitations as laid down by aviation regulations. In fact, these limits exist to ensure safety in air travel. The Federal Aviation Regulations (FARs) in the USA, for instance, have set specific limitations on pilot flight time and rest periods.
According to FAR Part 91 Subpart K, the maximum allowable flight time for any crewmember is as follows: within 672 consecutive hours (which amounts to 28 days), a maximum of 100 hours can be flown. This means option a) is the correct one. Further, for any 365 consecutive calendar day period, the maximum allowable flight time is 1000 hours, which corresponds to option d).
It's important to understand that these rules are designed to prevent crew fatigue, especially among pilots. They are founded on scientific research into sleep patterns, circadian rhythms, and human performance, all with the aim of maintaining a high level of safety in the aviation industry.
Learn more about Flight Time Limitations here:
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