 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS: B22606      ]
 ]  RENE SAUSER       ]    BFS PROGRAM NOTE         ] DR: 108579       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ]  (310)922-4164     ]      RELEASE NOTE ( )       ]  11 JULY 1993    ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]   OI-23 AND SUBS              ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( ) BSS( ) GNC( ) SEQ(X) SM/SP( ) IPL( )]       OPS 1, OPS 3      ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: ABORT, SEQ, OMS, DUMP, ASCENT, ENTRY             ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: MG038120/3.3.1.9, 3.3.1.13                     ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]  BFS INTERCONNECTED ATO OMS DUMPS REQUIRING CREW INTERVENTION       ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]  THERE EXISTS AN INTERCONNECTED ATO OMS DUMP SCENARIO WHICH WOULD   ]
 ]  REQUIRE CREW INTERVENTION IF BFS WERE ENGAGED DURING THE DUMP.     ]
 ]                                                                     ]
 ]  DUE TO PASS GUIDANCE SOFTWARE DESIGN, THE SLOW RATE AT WHICH PASS  ]
 ]  GUIDANCE RUNS AND THE ASYNCHRONOUS NATURE OF THE GUIDANCE SOFTWARE ]
 ]  BETWEEN PASS AND BFS, BFS MAY GET AHEAD OF PASS BY AS MUCH AS A    ]
 ]  GUIDANCE CYCLE (1.92 SEC) GOING INTO AN INTERCONNECTED ATO OMS     ]
 ]  DUMP. IF THIS OCCURS, PASS AND BFS WILL CONFIGURE THE OMS DUMP     ]
 ]  DIFFERENTLY IN AN INTERCONNECTED ATO OMS DUMP.                     ]
 ]                                                                     ]
 ]  BFS WILL FAIL THE INTERCONNECT AND GO TO AN OMS-ONLY CONFIGURATION,]
 ]  WHILE PASS WILL GO INTERCONNECTED. BFS WILL COMPUTE AND DISPLAY A  ]
 ]  MUCH LONGER OMS_TTG THAN PASS ON THE BFS OVERRIDE DISPLAY.         ]
 ]                                                                     ]
 ]  IF BFS IS ENGAGED DURING THE PASS INITIATED DUMP, BFS WILL LEAVE   ]
 ]  THE OMS ENGINES ON, RECONFIGURE THE DUMP TO OMS ONLY, DUMP TO IT'S ]
 ]  LONGER DUMP TIMER, AND IF NOT STOPPED BY CREW INTERVENTION, BFS    ]
 ]  COULD DUMP THE OMS TANKS DRY.                                      ]
 ]  (SEE SUPPLEMENTAL SHEET FOR BFS ENGAGE AFTER PASS DUMP COMPLETION) ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]  BE AWARE THAT DURING INTERCONNECTED ATO OMS DUMPS THAT THE         ]
 ]  POTENTIAL EXISTS FOR PASS AND BFS TO CONFIGURE THE DUMP DIFFERENT- ]
 ]  LY AND THAT MANUAL TERMINATION OF THE DUMP MAY BE REQUIRED IF BFS  ]
 ]  IS ENGAGED DURING THE OMS DUMP. (SEE SUPPLEMENTAL)                 ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]RI: <S> J. AGRES          DATE 07/23/93]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 08/23/93]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 08/26/93 ]
 ]PF MGR:  KENNY TODD       DATE 08/25/93]------------------- -------- ]
 ]         CHRIS BUDAHL          08/26/93] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
 @




 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] SMS: B22606      ]
 ]  RENE SAUSER       ]    BFS PROGRAM NOTE         ] DR: 108579       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ]  (310)922-4164     ]      RELEASE NOTE ( )       ]  11 JULY 1993    ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ]                                                                     ]
 ]  BFS INTERCONNECTED ATO OMS DUMPS REQUIRING CREW INTERVENTION       ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]  IF BFS IS ENGAGED AFTER PASS HAD COMPLETED THE INTERCONNECTED OMS  ]
 ]  DUMP BUT BEFORE THE BFS OMS_TTG HAD COUNTED DOWN TO ZERO, THE BFS  ]
 ]  WILL SET THE ORBITER DUMP INHIBIT FLAG TO PREVENT OMS ENGINE RE-   ]
 ]  STARTS. IF A SUBSEQUENT DOWNMODE TO A TAL WERE TO OCCUR AND ANOTHER]
 ]  DUMP WERE DESIRED, THE CREW WOULD HAVE TO START THE DUMP MANUALLY  ]
 ]  SINCE THE ORBITER DUMP INHIBIT FLAG WILL NOT BE RESET FOR THE      ]
 ]  DOWNMODE. IN ADDITION, OMS_TTG WILL NEED TO BE CORRECTED.          ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]  BE AWARE THAT FOR AN INTERCONNECTED ATO TO A TAL DOWNMODE WHERE    ]
 ]  BFS WAS ENGAGED AFTER PASS HAD COMPLETED THE ATO OMS DUMP BUT      ]
 ]  BEFORE BFS OMS_TTG REACHED ZERO, BFS WILL SET ORBITER_DUMP_INH AND ]
 ]  ANY SUBSEQUENT OMS DUMP THE CREW DESIRES TO PERFORM ON TAL ENTRY   ]
 ]  WILL HAVE TO BE INITIATED MANUALLY VIA THE BFS OVERRIDE DISPLAY.   ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 @
