What is meant by 'critical takeoff weight'?

'Critical takeoff weight' refers to the maximum weight at which an aircraft can safely take off under specific conditions. This weight is crucial for ensuring that the aircraft can achieve the necessary speed and lift to become airborne without exceeding performance limits set by the aircraft design and operational parameters.

Takeoff performance is influenced by various factors, including the aircraft's weight, balance, runway length, altitude, and environmental conditions such as temperature and wind. Exceeding this weight may compromise the aircraft's ability to reach the required takeoff speed or achieve adequate climb performance, risking safe operation.

In contrast, the other options do not define critical takeoff weight accurately. The weight of the aircraft during landing relates to different operational parameters that may vary from takeoff conditions. Inflight maneuvers involve considerations of weight limits, but these are not referred to as critical takeoff weight. Lastly, while the total weight of fuel is part of the overall aircraft weight, critical takeoff weight encompasses all aspects of the aircraft's loading and performance capabilities, not just fuel. Thus, understanding critical takeoff weight is essential for safe flight operations.