 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS:  B02800A    ]
 ] R. LOHMANN         ]    BFS PROGRAM NOTE         ]                  ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 07/11/84   ]
 ] RI/DNY X-4164      ]      RELEASE NOTE ( )       ] REV B: 07/31/90  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]    STS-14 AND SUBS            ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( ) BSS( ) GNC( ) SEQ(X) SM/SP(X) IPL( )]  1                      ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: BEC, OPS, PAYLOAD, TRANSITION                    ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: MG038120/3.3.1.15                              ]
 ]_____________________________________________________________________]
 ] TITLE:  BFS PRE-LAUNCH MODE TO MM102                                ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]  UNDER CURRENT REQUIREMENTS, BFS WILL MODE TO MAJOR MODE 102        ]
 ]  PRE-ENGAGED OR ENGAGED 3.2 SECONDS AFTER DETECTING ALL THREE       ]
 ]  MAIN ENGINES GREATER THAN 90% CHAMBER PRESSURE EVEN IF THE         ]
 ]  SRB'S ARE NOT IGNITED. IF BFS IS ENGAGED IN MM101 AND THEN TRAN-   ]
 ]  SITIONED TO MM102 AND THE SSME'S ARE NOT SHUTDOWN BEFORE 100       ]
 ]  SECONDS HAVE ELAPSED IN MM102, THE SRB SEP COMMANDS WILL BE        ]
 ]  ISSUED.                                                            ]
 ]  TESTS HAVE PROVEN THAT IF THE SSME'S ARE SHUTDOWN BY PASS AND THEN ]
 ]  BFS IS ENGAGED IN MM102 THE SRB SEP COMMANDS WILL NOT BE ISSUED    ]
 ]  AFTER 100 SECONDS HAVE ELAPSED. HOWEVER, THE USER RESPONSE SHOULD  ]
 ]  BE FOLLOWED.                                                       ]
 ]---------------------------------------------------------------------]
 ]  USER RESPONSE:                                                     ]
 ]                                                                     ]
 ]     TO SAFE THE BFS FOLLOWING A PAD ABORT/SHUTDOWN:                 ]
 ]                                                                     ]
 ]     1.  IF BFS IS ENGAGED IN MM 101 OR MM 102 AND THE SRB'S ARE     ]
 ]         NOT IGNITED, NOTE THAT THE SSME'S SHOULD BE SHUTDOWN AND    ]
 ]         THEN BFS SHOULD BE MODED TO HALT (CRITICAL FUNCTION).       ]
 ]                                                                     ]
 ]     2.  TO PREVENT AN UNINTENTIONAL BFS ENGAGE, TAKE BOTH FLIGHT    ]
 ]         CONTROLLER POWER SWITCHES (PANEL F6 AND F8) TO OFF.         ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]RI: <S> C. PURTELL        DATE 07/31/90]                             ]
 ] --------------------         ---------]                             ]
 ]FDSD: SAM ANKNEY          DATE 08/14/90]                             ]
 ] --------------------         ---------] DARRELL E. STAMPER 08/16/90 ]
 ]PF MGR: KENNY TODD        DATE 08/16/90]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
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