What does the term "EW" refer to in aviation?

The term "EW" in aviation refers to "Empty Weight." Empty weight is a critical measurement that indicates the weight of an aircraft without any payload, fuel, or other items that could be added before a flight. This weight typically includes the aircraft’s structure, powerplant, and all necessary equipment, including fluids for proper operation (like oil and hydraulic fluid), but excludes consumables such as fuel and passengers.

Understanding empty weight is essential for flight planning and operational safety, as it is a foundational component in calculating the maximum weight an aircraft can safely carry during flight operations. This encompasses cargo, passengers, and fuel. Knowing the empty weight helps pilots and operators ensure compliance with weight and balance limitations set by manufacturers and regulatory authorities, which are critical for safe flight performance.