ΔCG represents a change in what component of an aircraft?

• A. Change in temperature
• B. Change in gauge calibration
• C. Change in center of gravity
• D. Change in engine cooling rate

Answer: (C)

ΔCG is a change in the center of gravity—the point along the aircraft’s longitudinal axis where it would balance. The center of gravity is determined by the distribution of mass inside the airplane, including people, baggage, cargo, and fuel. When that mass distribution shifts, the CG moves, and ΔCG measures that shift. This matters because the CG position directly affects stability and control: a forward CG typically increases stability but makes pitch control heavier and raises stall speed, while an aft CG reduces stability but improves elevator effectiveness and can create handling risks if pushed too far. ΔCG is not describing temperature changes, gauge calibration, or engine cooling rate, which are separate concepts. So ΔCG represents a change in the center of gravity.