Which statement accurately describes MTOW and MZFW?

• A. MTOW governs total weight including fuel; MZFW limits payload when carrying little or no fuel.
• B. MTOW governs only payload.
• C. MTOW is the maximum zero fuel weight.
• D. MZFW is the maximum takeoff weight.

Answer: (A)

Understanding MTOW versus MZFW is key. MTOW is the maximum takeoff weight—the top limit for the aircraft’s weight at engine start, and it includes everything on board: fuel, passengers, cargo, and crew. MZFW stands for maximum zero fuel weight—the maximum weight of the aircraft with no usable fuel, effectively the airframe plus payload (and crew) before fuel is added. This means MZFW constrains how heavy the payload can be when there isn’t much fuel on board; if you fuel the airplane heavier, you can still stay under MTOW, but you can’t exceed MTOW regardless of fuel. The statement aligns with these definitions: MTOW sets the total weight ceiling including fuel, and MZFW limits payload when the fuel load is small. The other options mix up the definitions—MTOW is not limited to payload only, MZFW is not the same as MTOW, and MZFW is not the maximum takeoff weight.