Tailplane and Tail unit

Tailplane noun - The horizontal airfoil of an aircraft's tail assembly that is fixed and to which the elevator is hinged.

Tail unit and tailplane are semantically related in tail assembly topic. In some cases you can use "Tail unit" instead a noun "Tailplane".

Tailplane and tail unit are semantically related in tail assembly topic. You can use "Tailplane" instead a noun phrase "Tail unit".