 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS: B21569      ]
 ] R. VANDERWOOD      ]    BFS PROGRAM NOTE         ] DR:  106202      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] RID    922-5341    ]      RELEASE NOTE ( )       ]    5-1-91        ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-8C AND SUBS                ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( ) BSS( ) GNC( ) SEQ( ) SM/SP(X) IPL( )]   0, 3                  ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  SM                                              ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  MG038119/3.2.1.2.5                            ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]         TDRS SELECTION FOR S-BAND ANTENNA                           ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] TDRS SELECTION FOR THE BFS S-BAND ANTENNA MANAGEMENT FUNCTION IS    ]
 ] BASED ON THE LAST SELECTED TDRS.  IF THAT TDRS IS IN VIEW IT WILL   ]
 ] BE USED.  IN PARTICULAR, IF BOTH EAST AND WEST TDRS'S ARE IN VIEW   ]
 ] ON A TRANSITION TO MAJOR MODE 301 FROM ON-ORBIT OPS 0, THE LAST     ]
 ] SELECTED TDRS WILL BE USED.  THE ANTENNA MANAGEMENT MODULE DOES     ]
 ] NOT RUN IN OPS 0; SO, THIS LAST SELECTION COULD COME FROM OPS 1     ]
 ] OR A PREVIOUS OPS 3 FLIGHT PHASE.  IF AN IPL IS PERFORMED           ]
 ] ON ORBIT, THE LAST-SELECTED-TDRS FLAG IS INITIALIZED TO             ]
 ] WEST.                                                               ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] THE USER SHOULD BE AWARE THAT AFTER AN ON-ORBIT OPS 0 TO MAJOR MODE ]
 ] 301 TRANSITION THE BFS S-BAND ANTENNA MANAGEMENT FUNCTION WILL      ]
 ] CONTINUE TO USE THE LAST SELECTED TDRS IF IT IS IN VIEW.            ]
 ] THE LAST SELECTED TDRS IS NOT NECESSARILY WEST.                     ]
 ]                                                                     ]
 ] AN IPL WILL INITIALIZE THE LAST-SELECTED-TDRS FLAG TO WEST.         ]
 ] PUTTING BFS IN HALT OR STANDBY DOES NOT AFFECT THIS INITIALIZATION. ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]RI: <S> C. PURTELL        DATE 05/02/91]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 05/14/91]                             ]
 ]     -------------------      ---------]DARRELL E. STAMPER  05/15/91 ]
 ]PF MGR: JAMES BAGWELL     DATE 05/14/91]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
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