SPACECRAFT NAVIGATION & CONTROL A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site alternate mission A secondary flight plan that may be selected when the primary flight plan has been abandoned for any reason other than abort. Related category    • SPACECRAFT NAVIGATION AND CONTROL Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History BACK TO TOP