The empennage was mounted on twin booms linked by a tailplane. Aircraft empennage designs may be classified broadly according to the fin and tailplane configurations. The aircraft has twin booms with twin rudders and a high-mounted tailplane. The horizontal tailplane itself is unswept. The wings are of two laminations, and the tailplane and tailfin of a single lamination. The elevators are usually hinged to the tailplane or horizontal stabilizer. These tail booms terminate in vertical stabilizers, with a horizontal tailplane joining them. The horizontal tailplane, which consists of fixed stabilizers and trailing elevators, has no trim tabs. The starboard part of the tailplane had been lost. It had twin vertical stabilizers mounted at the tips of the tailplane. The MD-87 features modifications to its tail, with a fin extension above the tailplane. These changes included the adoption of an all-moving tailplane, and cambered leading edge extensions. The wings and tailplane were also damaged. Sometimes there may be two or more fins, spaced out along the tailplane. It has a retractable tricycle landing gear and a low tailplane.