How does Maximum Takeoff Weight differ from Maximum Ramp Weight?

Maximum Takeoff Weight (MTOW) and Maximum Ramp Weight (MRW) are both critical parameters in aircraft operations, but they serve different purposes in relation to the aircraft's total weight during different phases of the operation.

Maximum Takeoff Weight represents the maximum weight at which the aircraft is certified to take off. This weight includes the aircraft itself, passengers, cargo, and usable fuel. Hence, it ensures that the aircraft can safely operate within its performance limits, such as climb performance and handling.

Maximum Ramp Weight, on the other hand, includes all the factors that are considered in preparation for takeoff, such as the weight of the aircraft, passengers, cargo, and the fuel needed for start, taxiing, and any necessary engine run-up checks before departing. It accounts for everything that exists on the aircraft before it begins its takeoff roll.

The distinction lies in the fact that MRW includes additional weight considerations that are not part of the MTOW, specifically the fuel needed for taxi and run-up operations. This makes MRW a little higher than MTOW because it considers an increased weight for taxi and pre-flight checks but not the entire weight load desired for takeoff.

Recognizing this difference is key for pilots to ensure compliance with