Klingon Bird-of-Prey landing struts
Intrepid-class landing struts
Landing struts were the support systems on starships that are used in planetary landings. Normally inside the ship, the landing struts are exposed by moving panels when needed.
Klingon Birds-of-Prey were equipped with landing struts, and the Bird-of-Prey rechristened as the HMS Bounty by the senior staff of the late USS Enterprise used its two struts to land on Vulcan in the mid 2280s. (Star Trek III: The Search for Spock; Star Trek IV: The Voyage Home)
Starfleet's Template:ShipClass was equipped with landing struts, and the USS Voyager used these several times while stranded in the Delta Quadrant in the 2370s. (VOY: "The 37's", "Basics, Part I", "Dragon's Teeth", "Nightingale")