 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS: B22592      ]
 ]   RENE SAUSER      ]    BFS PROGRAM NOTE         ] DR:  108524      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 6/19/92    ]
 ] BNA/(562)922-2144  ]      RELEASE NOTE ( )       ] REV A: 02/03/97  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]      OI-26 & SUBS             ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( ) BSS( ) GNC( ) SEQ(X) SM/SP( ) IPL( )]       1, 3, 6           ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  ABORT, OMS, ASCENT, SEQ                         ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: MG038120/3.3.1.7, 3.3.1.9, 3.3.1.15            ]
 ]_____________________________________________________________________]
 ] TITLE:  AUTOMATIC OMS DUMPS INHIBITED UPON ENGAGEMENT               ]
 ]_____________________________________________________________________]
 ] DESCRIPTION: THE FOLLOWING APPLIES TO ALL AUTOMATIC OMS DUMPS WHICH ]
 ]              INCLUDE ALL ABORT OMS DUMPS AND THE OMS ASSISTED BURN: ]
 ]                                                                     ]
 ]  DURING THE FOLLOWING TWO SCENARIOS BFS, UPON ENGAGEMENT, WILL SET  ]
 ]  ORBITER_DUMP_INH AND NOT PERFORM ANY AUTOMATIC OMS DUMPS. AN       ]
 ]  INHIBITED OMS DUMP WILL BE VISIBLE VIA UNCHANGED PRESSURE SENSOR   ]
 ]  INDICATORS AND OMS TTG WILL STOP DECREMENTING ON THE BFS OVERRIDE  ]
 ]  DISPLAY. IN ADDITION, BFS WILL START A 30 SECOND DELAY TIMER AT    ]
 ]  ENGAGEMENT TO PROTECT AGAINST OMS RESTARTS.                        ]
 ]                                                                     ]
 ]SCENARIO #1:                                                         ]
 ]  FOR ANY AUTOMATIC OMS DUMP IF PASS FAILS PRIOR TO COMMANDING OMS   ]
 ]  ENGINES ON, THEN BFS GOES STANDALONE AND WHILE STANDALONE BFS SETS ]
 ]  ITS OWN OMS IGNITION EVENT (S_OMS_IGN), A WINDOW EXISTS BETWEEN BFS]
 ]  S_OMS_IGN = ON AND BFS S_OMS_IGN = OFF (AT BFS PERCEIVED OMS DUMP  ]
 ]  COMPLETION) WHERE BFS, IF ENGAGED, WOULD SET ORBITER_DUMP_INH.     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ]SCENARIO #1 USER RESPONSE:                                           ]
 ]  BE AWARE THAT ONCE ANY AUTOMATIC OMS DUMP IS INHIBITED, ALL OMS    ]
 ]  DUMPS MUST BE INITIATED MANUALLY. BE AWARE THAT SINCE A 30 SECOND  ]
 ]  DELAY TO MANUAL DUMP START IS IMPOSED AT BFS ENGAGEMENT, A SLOW    ]
 ]  BFS ENGAGE AND/OR A SLOW MANUAL INITIATION OF THE DESIRED DUMP CAN ]
 ]  ADVERSELY AFFECT VEHICLE PERFORMANCE (ESPECIALLY FOR OMS ASSISTS   ]
 ]  WITH LITTLE OR NO PERFORMANCE MARGIN).                             ]
 ]                                                                     ]
 ]  SEE THE SUPPLEMENTAL PAGE USER RESPONSE FOR EXPLANATION OF MANUAL  ]
 ]  OMS DUMP INITIATION.                                               ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]BNA:<S> D. CORBIN         DATE 04/29/97]                             ]
 ]    --------------------      ---------]                             ]
 ]ASD:  ERIC C. BINGHAM     DATE 06/05/97]                             ]
 ]    --------------------      ---------] MELVIN R. ROTHER   06/27/97 ]
 ]PF MGR:  JOHN RUPPERT     DATE 06/19/97]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
 @




 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] SMS: B22592      ]
 ]   RENE SAUSER      ]    BFS PROGRAM NOTE         ] DR:  108524      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 6/19/92    ]
 ] BNA/(562)922-2144  ]      RELEASE NOTE ( )       ] REV A: 02/03/97  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:  AUTOMATIC OMS DUMPS INHIBITED UPON ENGAGEMENT               ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]SCENARIO #2:                                                         ]
 ]  AN ATO IS DECLARED VERY NEAR THE END (WITHIN 5.6 SECS FOR 3-ENGINE ]
 ]  ON ATO AND 2.4 SECS FOR ENGINE-OUT ATO) OF THE OMS ASSISTED BURN.  ]
 ]  PASS WILL TRANSITION DIRECTLY INTO THE ATO OMS DUMP, BUT BFS, DUE  ]
 ]  TO A GUIDANCE-INDUCED LAG WILL COMPLETE THE OMS ASSIST, PERFORM A  ]
 ]  TURNOFF AND PURGE THEN SET A 30 SECOND OMS RESTART PROTECTION TIMER]
 ]  BEFORE RECOGNIZING THE ATO. AT EXPIRATION OF THE 30 SECOND TIMER   ]
 ]  BFS WILL SET ITS OMS IGNITION EVENT (S_OMS_IGN) ON TO PERFORM THE  ]
 ]  ATO OMS DUMP. A 30 SECOND WINDOW EXISTS BETWEEN BFS SETTING        ]
 ]  S_OMS_IGN ON AND BFS COMPLETION OF THE DELAYED ATO OMS DUMP WHERE  ]
 ]  BFS, IF ENGAGED, WOULD SET ORBITER_DUMP_INH AND RESTART THE 30 OMS ]
 ]  RESTART PROTECTION DELAY TIMER.                                    ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ]SCENARIO #2 USER RESPONSE:                                           ]
 ]  BE AWARE THAT PASS HAS ALREADY SUCCESSFULLY COMPLETED THE ATO OMS  ]
 ]  DUMP. NO CREW ACTION IS REQUIRED UNLESS ADDITIONAL OMS DUMPING IS  ]
 ]  DESIRED SUCH AS IN A DOWNMODE TO A TAL.                            ]
 ]                                                                     ]
 ]MANUAL DUMP INITIATION FOR EITHER SCENARIO:                          ]
 ]  MANUALLY ENABLE AND START THE DUMP VIA ITEM 6 AND 7 ON THE BFS     ]
 ]  OVERRIDE DISPLAY. THE DUMP TIME WILL DEFAULT TO MANAUL_OMS_DT AND  ]
 ]  THE DUMP WILL START AS SOON AS THE 30 SECOND OMS RESTART PROTECTION]
 ]  TIMER (STARTED AT ENGAGEMENT) EXPIRES. THE OMS DUMP TIME MAY THEN  ]
 ]  BE ADJUSTED BY ENTERING THE DESIRED DUMP QUANTITY (ITEM 9) ON THE  ]
 ]  BFS OVERRIDE DISPLAY APPROPRIATE FOR THE TYPE OF OMS DUMP DESIRED. ]
 ]  IF AN INTERCONNECTED DUMP IS REQUIRED, PERFORM THE INTERCONNECT VIA]
 ]  THE BFS OVERRIDE DISPLAY.                                          ]
 ]_____________________________________________________________________]
 @
