obstacle
as defined in Commission Implementing Regulation (EU) 2017/373 of 1 March 2017 laying down…
all fixed (whether temporary or permanent) and mobile objects, or parts thereof, that: (a) are located on an area intended for the surface movement of aircraft; or (b) extend above a defined surface intended to protect aircraft in flight; or (c) stand outside those defined surfaces and have been assessed as being a hazard to air navigation