2.1 | MASS AND BALANCE 

The mass and balance are extremely important for an aircraft. If an aircraft is not balanced, it may become uncontrollable. For an aircraft there are several different concepts of mass:

• Unladen weight: the weight of all parts of the aircraft without load and fuel.  
• Take-off weight: the weight of the aircraft including load and fuel.  
  
• Landing weight: the take-off weight minus the fuel consumed.