<h2>AAS 97-161</h2>
<h2>SPACE SHUTTLE CONTINGENCY SUPPORT PLANNING BY THE GODDARD  SPACE FLIGHT CENTER FLIGHT DYNAMICS DIVISION                                          </h2>
<h4> J. O. Cappellari, Jr., L. March, W. F. Forcey, D. P. Morgenstern, P. P. Powers, and M. P. Schwegmann, Computer Sciences Corporation; A. Showell, Allied Signal Technical </h4>
<h2> Abstract </h2>
 The Goddard Space Flight Center (GSFC) Flight Dynamics Division is responsible for  generating and transmitting Ground Network and Space Network (SN) acquisition data  for all Space Shuttle mission phases, including all contingency cases.  These  acquisition data are necessary for tracking and maintaining communications with the  Shuttle Orbiter.  This paper describes the various Shuttle contingencies, discusses  the generation of acquisition date; and traces the development of enhancements to  improve the quality of contingency acquisition data.  The application of the  techniques and procedures developed for Shuttle support to other SN users is also  discussed.