NASA 4D-print ‘space chain mail’ to protect astronauts from flying

nasa 4dWith renewed emphasis on 4D trajectories and time management in the JPDO NextGen concepts, it is useful to review the history and current status of 4D flht management. InNPD 7120.4D, NASA Engineering and ProgramProject Management Policy dated February 16, 2017. Robert Lhtfoot Acting Administrator > ATTACHMENT A: (TEXT)