(BLOOMBERG) -- The $13 billion Gerald R. Ford aircraft carrier, the U.S. Navy’s costliest warship, was delivered last year without elevators needed to lift bombs from below deck magazines for loading on fighter jets.

Previously undisclosed problems with the 11 elevators for the ship built by Huntington Ingalls Industries Inc. add to long-standing reliability and technical problems with two other core systems -- the electromagnetic system to launch planes and the arresting gear to catch them when they land.

The Advanced Weapons Elevators, which are moved by magnets rather than cables, were supposed to be installed by the vessel’s original delivery date in May 2017. Instead, final installation was delayed by problems including four instances of unsafe “uncommanded movements” since 2015, according to the Navy.

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