Definition
A pitching moment that rotates the aircraft's nose downward about its lateral axis, typically produced when the center of gravity is located forward of the center of lift. The further forward the CG, the stronger the nose-down pitching moment, which the tail must counteract with downward aerodynamic force to maintain level flight.
Plain English
A natural pull that wants to push the aircraft's nose down toward the ground. It happens mainly when weight is loaded too far forward, so the front of the airplane is heavier than it should be and the tail has to work harder to keep the nose up.
Context Anchor
Seen in weight-and-balance discussions when explaining how a forward loading condition affects nose-up and nose-down control.
Why Pilots Care
A pronounced nose-down tendency increases control forces, raises stall speed, and reduces the margin for recovery from a dive or gust.
Analogy
Think of a seesaw with more weight on the front side. Unless the other side pushes down enough to balance it, the front side drops.
Grounding Statement
If the aircraft is loaded too far forward, the nose may want to drop even though the pilot is trying to hold it level or raise it.
Intuition Check
Nose-down tendency does not mean the airplane is already diving. It means the airplane has a natural tendency to lower its nose unless it is properly balanced or controlled.
Example Sentence 1
With both passengers seated up front and baggage in the forward compartment, the pilot noticed a strong nose-down tendency that required constant back pressure on the yoke.
Example Sentence 2
The weight-and-balance sheet warned that exceeding the forward CG limit would produce an unacceptable nose-down tendency in flight.