 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS:B27703       ]
 ]    L. A. IVERS     ]    BFS PROGRAM NOTE         ] DR: 108512       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] RID/ 310-922-4858  ]      RELEASE NOTE ( )       ]      8/11/92     ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]    OI21 AND SUBS              ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( ) BSS( ) GNC(X) SEQ( ) SM/SP( ) IPL( )]     1 AND 6             ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: GUID                                             ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: MG038104 / 3.2.3.1.10.5.3                      ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]        DOWNLISTED TGO DATA STATIC PRIOR TO MECO                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]        THE DOWNLISTED VERSION OF TIME-TO-GO, TGO_DL, STOPS BEING    ]
 ] UPDATED WHEN SECOND STAGE GUIDANCE MODES TO THE FINE COUNTDOWN      ]
 ] PHASE. THIS IS APPROXIMATELY 26 SECONDS BEFORE MECO FOR RTLS AND    ]
 ] 10 SECONDS FOR ALL OTHER SECOND STAGE MODES.                        ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ]  USER SHOULD BE AWARE THAT THE CURRENTLY DOWNLISTED VALUE OF TGO_DL ]
 ]  (V98W1816) IS INVALID DURING THE ABOVE NOTED TIME INTERVALS.       ]
 ]  THE USER HAS THE OPTION OF EMPLOYING THE VARIABLE DOWNLIST SELECT  ]
 ]  CAPABILITY TO DOWNLIST THE FLOATING POINT VERSION OF TGO WHICH WILL]
 ]  BE VALID THROUGH MECO IN ALL FLIGHT MODES. THE VARIABLE DOWNLIST   ]
 ]  MSIDS FOR POSSIBLE USE ARE V98U1280, 81, AND 82. THE COMMAND TO    ]
 ]  PERFORM THE DOWNLIST FUNCTION FOR TGO MAY BE CONSTRUCTED PRE-LIFT- ]
 ]  OFF CAUSING TGO TO BE DOWNLISTED AT A 1.04 HZ. RATE THROUGH MECO.  ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]RI: <S> J. AGRES          DATE 09/21/92]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:  ROBERT N. HINSON   DATE 10/05/92]                             ]
 ]     -------------------      ---------] S. N. HARDEE, JR.  10/05/92 ]
 ]PF MGR:  GENE MCSWAIN     DATE 10/05/92]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
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