NOAA Twin Otter N57RF 2015-03-10 2015 Mar 10 Photo: Ens. B.J. Bonner / NOAA Click for download, licensing and other information i NOAA DHC-6 Twin Otter N57RF in the hangar. Topics Operation Aircraft Operations General Hangar, Tarmac Fleet type Aircraft Aircraft DeHavilland Twin Otter (DHC-6), N57RF Share