What is the significance of the empty weight center of gravity range?

• A. If the empty weight CG lies within the EWCG range, the aircraft cannot be legally loaded to move outside the loaded CG range. Not all aircraft have an EWCG range.
• B. It determines the fuel capacity.
• C. It determines the minimum speed for takeoff.
• D. It is the same as the mean aerodynamic chord.

Answer: (A)

The idea being tested is how the empty-weight center of gravity relates to the limits used for loading the aircraft. The empty-weight CG is the balance point when the airplane is in its empty condition, and the EWCG range is the span of CG positions that are acceptable for that empty condition. When the actual empty-weight CG sits inside this EWCG range, it means the airplane’s empty balance is already within the band that supports certified loading limits. Because of that, permissible loading (fuel and payload) cannot be configured to push the CG beyond the aircraft’s approved loaded-CG envelope; attempting to move the CG outside the loaded range would violate the certification. Not all aircraft have an EWCG range, which is why this concept applies only to certain models.

This option isn’t about fuel capacity, takeoff speed, or mean aerodynamic chord, which are governed by different aspects of the airplane’s design and operation.