"George H.W. Bush" returned to Northrop Grumman Newport News shipyard on 18 June 2009 for post-delivery maintenance work, also known as the ship's post shakedown availability (PSA). A PSA is a typical availability in the early life of a carrier that allows the Navy and builder to resolve any items that came up during trials and delivery and make any last-minute changes and upgrades. Work includes the installation of a Rigid Hull Inflatable Boat (RHIB) handling system and a new fresh water purification system. Other changes include compartment reconfigurations, combat system and radar equipment upgrades, and minor repairs. The work was scheduled to last through early 2010.