In place of passenger seats, carpets and stow bins, the first 767-400ER(extended range), designated VQ001, is furnished with 26,000 pounds of flight test equipment. The most noticeable fixtures are the 42 keg-shaped water barrels, used to simulate the weight of passengers and baggage. For certain tests, water is pumped between barrels to rapidly change the airplane's center of gravity. Instruments, installed on racks, can record more than 21,000 inputs during flight, including engine performance, temperatures and flight control surface angles, which are transmitted in real time to a telemetry, or transmission, room at Boeing Field in Seattle. The data allows engineering specialists to monitor and analyze the airplane's systems and performance. The goal of flight testing is to thoroughly test the airplane and ensure that it is reliable and service-ready when it is delivered to the launch customer.