Which factor best indicates positive or negative G forces acting on an aircraft?

Which factor best indicates positive or negative G forces acting on an aircraft?

• A. Change in altitude
• B. Change in how heavy or light you feel in your seat
• C. Engine RPM
• D. Airspeed

Answer: (B)

The key idea is that G-forces are the acceleration forces you feel as changes in your weight. The best indicator of positive or negative G’s acting on an aircraft is how heavy or light you feel in your seat. When you pull up into a climb, the aircraft’s upward acceleration adds to gravity, so you feel heavier (positive G). When you push over into a dive or if the lift drops below weight, you feel lighter or even momentarily weightless (negative G). This sensation directly reflects the load factor—the total acceleration the airplane and occupants experience relative to gravity. Altitude change, engine RPM, and airspeed are related to flight conditions and performance, but they don’t by themselves measure the instantaneous load on you and the airplane. You can have various airspeeds or altitudes while experiencing different G-forces, so those factors aren’t reliable indicators of the current G-force environment.

The key idea is that G-forces are the acceleration forces you feel as changes in your weight. The best indicator of positive or negative G’s acting on an aircraft is how heavy or light you feel in your seat. When you pull up into a climb, the aircraft’s upward acceleration adds to gravity, so you feel heavier (positive G). When you push over into a dive or if the lift drops below weight, you feel lighter or even momentarily weightless (negative G). This sensation directly reflects the load factor—the total acceleration the airplane and occupants experience relative to gravity.

Altitude change, engine RPM, and airspeed are related to flight conditions and performance, but they don’t by themselves measure the instantaneous load on you and the airplane. You can have various airspeeds or altitudes while experiencing different G-forces, so those factors aren’t reliable indicators of the current G-force environment.