Definition
The aerodynamic force produced by the horizontal stabilizer and elevator that acts on the tail of an aircraft. In most conventional airplanes this load is directed downward, balancing the nose-down pitching moment caused by the wing's lift acting behind the center of gravity.
Plain English
The push or pull the air creates on the tail of the airplane. On most airplanes, the tail is actually being pushed downward in flight to keep the nose from dropping.
Context Anchor
Seen in aircraft stability, trim, weight-and-balance, and control discussions, especially when explaining how the horizontal tail helps balance the airplane in flight.
Derivation
Load originally means a burden carried. In aviation and engineering, a load is a force that a part of the aircraft must carry or produce. Here it means the force on the tail, not baggage placed in the tail.
Why Pilots Care
Tail load directly affects allowable center-of-gravity limits, trim settings, and overall handling qualities; excessive values can reduce elevator authority or indicate an out-of-limit loading condition.
Analogy
Think of a seesaw with the wing as the pivot. The nose tends to tip down because of how lift and weight are arranged, so the tail pushes down on its end of the seesaw to keep the airplane level.
Grounding Statement
Picture the tail gently pressing downward to counterbalance the wing's lift and hold the fuselage level.
Intuition Check
Do not read “tail load” as cargo loaded into the back of the airplane. Here, “load” means an aerodynamic force acting on the tail surfaces.
Example Sentence 1
Moving the center of gravity aft reduces the tail load required for level flight, which decreases drag.
Example Sentence 2
During the weight-and-balance check the pilot confirmed the tail load remained within limits for the planned takeoff.