Final answer:
A post-takeoff Flight Duty Period (FDP) extension expires after landing at the final destination, ensuring that crew members do not exceed the maximum allowable duty period and mitigating the risk of fatigue. The correct answer is option b.
Step-by-step explanation:
When discussing the Flight Duty Period (FDP) in aviation, it's important to understand that the regulations can vary by country and are governed by the relevant civil aviation authority. However, generally speaking, in the context of the Federal Aviation Administration (FAA) and other similar regulatory bodies, a post-takeoff FDP extension typically expires after landing at the final destination. This is done to ensure that crew members do not exceed the maximum allowable duty period, which could potentially lead to fatigue and compromise the safety of the flight.
The post-takeoff extension is used under unforeseen circumstances that require a flight to operate longer than originally planned. This extension gives the flight crew additional time to complete a flight that could otherwise exceed the standard FDP limits. However, safety measures such as mandatory rest periods following the extended duty are in place to mitigate fatigue risks.
Of the options given: a) After 2 hours, b) After landing at the final destination, c) After 30 minutes, and d) It does not expire; the correct answer is b) After landing at the final destination. This is when the extended FDP is considered to be completed, and subsequent rest requirements would begin.