The captain goes down with the ship concept has been explicitly extended in law to the pilot in command of an aircraft, in the form of laws stating that he "[has] final authority and responsibility for the operation and safety of the flight." Jurisprudence has explicitly interpreted this by analogy with the captain of a sea vessel. This is particularly relevant when an aircraft is forced to ditch in the ocean and becomes a floating vessel that will almost certainly sink. For example, following the crash of US Airways Flight 1549 into the Hudson River, pilot Chesley Sullenberger was the last person to exit the partially-submerged aircraft,
Honeywell Aerospace but the lack of ground support requires more in-plane instrumentation to avoid hazards. Auxiliary power units (APUs) are backup systems that deliver power to the engines, flight control and other avionics on an aircraft in the event the main power systems fail. The Honeywell 131-9 APU was used in an emergency landing when U.S. Airways Flight 1549 splash landed in New York City’s Hudson River on January 15, 2009, called the Miracle on the Hudson. Both CFM56 turbofans were damaged and electrical generators went off line. The pilot told the National Transportation Safety Board (NTSB) that his first command after