What condition may lead to erroneous scale readings when weighing an aircraft?

In the context of weighing an aircraft, the condition that can lead to erroneous scale readings is when the aircraft is parked on uneven ground. When the ground is not level, the weight distribution can shift, resulting in inaccurate readings. For precise weight and balance calculations, it is imperative that the aircraft is on a completely level surface so that each scale correctly reflects the true weight of the aircraft.

While setting parking brakes or wind gusts might not directly affect the weight measurement, they can influence the stability of the aircraft during the weighing process, but not as significantly as the surface the aircraft is on. Calibration of scales is also crucial, but if the ground is uneven, it poses a fundamental issue that can skew the readings regardless of the calibration status.