FAA Part 107 Remote Pilot (UAG)Loading and PerformanceMedium
During preflight, a remote pilot notices that a battery was installed farther aft than specified, moving the center of gravity near or beyond the aft limit. What is the primary concern with this loading condition?
- AThe aircraft's stall speed will increase significantly
- BThe aircraft will have reduced stability and may pitch up uncontrollably, risking a stall
- CThe aircraft will experience increased drag and slower cruise speed only
- DThe aircraft will be nose-heavy and difficult to rotate for takeoff
Show answer & explanationAnswer & explanation
Correct answer: B. The aircraft will have reduced stability and may pitch up uncontrollably, risking a stall
An aft CG reduces the aircraft's inherent pitch stability, making it prone to uncommanded pitch-up, which can lead to an unexpected stall and loss of control.
Why the other options are wrong
- A. Aft CG typically decreases stall speed slightly but reduces control margin, making stability the real hazard.
- C. An aft CG typically reduces drag slightly, not increases it.
- D. Nose-heaviness describes a forward CG issue, not aft.
Aft CG Effects
A center of gravity aft of the approved limit reduces longitudinal stability and increases the risk of an uncommanded pitch-up and stall.
- Reduces stick force gradient/stability
- Can cause uncontrollable pitch-up
- Lowers stall speed slightly but raises loss-of-control risk
Memory trick: Tail-heavy plane rears back like a startled horse.