 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS: B22630      ]
 ]   RENE SAUSER      ]    BFS PROGRAM NOTE         ] DR:  109697      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 04/24/97   ]
 ]   (562)922-2144    ]      RELEASE NOTE ( )       ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]   OI-26B & SUBS               ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( ) BSS( ) GNC( ) SEQ(X) SM/SP( ) IPL( )] OPS 1 - OMS ASSIST ONLY ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: ABORT, OMS, ASCENT, SEQ                          ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: MG038120/3.3.1.7, 3.3.1.9, 3.3.1.15            ]
 ]_____________________________________________________________________]
 ] TITLE: BFS MAY LAG PASS IN ATO OMS DUMP ON OMS ASSISTED MISSIONS    ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION: FOR OMS ASSIST ENABLED MISSIONS, IF AN ATO IS DECLARED ]
 ] VERY NEAR THE END OF THE OMS ASSISTED BURN, IT IS POSSIBLE FOR BFS  ]
 ] AND PASS ATO OMS DUMP TIMERS TO BECOME SKEWED. PASS WILL TRANSITION ]
 ] DIRECTLY INTO THE ATO OMS DUMP WHILE BFS WILL COMPLETE THE OMS      ]
 ] ASSISTED BURN, THEN WAIT 30 SECONDS BEFORE STARTING AN ATO OMS DUMP.]
 ] THIS WILL BE NOTICEABLE WHEN THE BFS OMS TTG STOPS DECREMENTING ON  ]
 ] THE BFS OVERRIDE DISPLAY WITHIN 6 SECONDS OR SO OF THE ATO DECLARA- ]
 ] TION.                                                               ]
 ] ONCE THE TIMERS BECOME SKEWED THERE ARE SEVERAL WINDOWS WHICH MAY   ]
 ] REQUIRE CREW ACTION SHOULD BFS BE ENGAGED IN ONE OF THOSE WINDOWS.  ]
 ] WINDOW 1: BFS ENGAGED WITHIN A COUPLE OF SECONDS OF ATO DECLARATION ]
 ]           SUCH THAT BFS, DUE TO A GUIDANCE-INDUCED LAG, HAS NOT YET ]
 ]           ACKNOWLEDGED THE ATO REQUEST. BFS WILL COMPLETE THE OMS   ]
 ]           ASSIST, TURNOFF THE OMS ENGINES, WAIT 30 SECONDS AND THEN ]
 ]           START THE ATO DUMP AUTOMATICALLY.                         ]
 ]                                                                     ]
 ](ADDITIONAL WINDOWS/USER RESPONSES DISCUSSED ON SUPPLEMENTAL PAGE)   ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] WINDOW 1 USER RESPONSE: NO CREW ACTION IS REQUIRED. BE AWARE THAT   ]
 ]           THE BFS WILL COMPLETE THE OMS ASSISTED BURN, TURNOFF THE  ]
 ]           OMS ENGINES, WAIT 30 SECONDS AND THEN AUTOMATICALLY START ]
 ]           THE ATO OMS DUMP FOR APPROXIMATELY THE CORRECT AMOUNT OF  ]
 ]           TIME (MAXIMUM 6 SECONDS MORE THAN PLANNED).               ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]BNA:<S> D. CORBIN         DATE 07/18/97]                             ]
 ]    --------------------      ---------]                             ]
 ]ASD:  ERIC C. BINGHAM     DATE 08/26/97]                             ]
 ]    --------------------      ---------] DARRELL E. STAMPER 10/31/97 ]
 ]PF MGR: JOHN P. RUPPERT   DATE 10/31/97]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
 @




 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] SMS: B22630      ]
 ] RENE SAUSER        ]    BFS PROGRAM NOTE         ] DR:  109697      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:04/24/97    ]
 ] (562)922-2144      ]      RELEASE NOTE ( )       ]                  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ]    BFS MAY LAG PASS IN ATO OMS DUMPS ON OMS ASSISTED MISSIONS       ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] WINDOW 2: IF BFS IS ENGAGED IN THE WINDOW BETWEEN BFS COMPLETION OF ]
 ]           THE OMS ASSISTED BURN AND PASS COMPLETION OF THE ATO OMS  ]
 ]           DUMP, BFS WILL, UPON ENGAGEMENT, PERFORM A TURNOFF AND    ]
 ]           PURGE OF THE OMS ENGINES AND ADD 30 SECONDS TO THE REMAIN-]
 ]           DER OF THE 30 SECOND DELAY TIMER AT THE EXPIRATION OF     ]
 ]           WHICH BFS WILL RESTART THE OMS FOR THE ATO DUMP REGARDLESS]
 ]           OF HOW MUCH ATO OMS PASS HAS ALREADY DUMPED. THIS WINDOW  ]
 ]           WILL BE NOTICEABLE VIA OMS TTG DECREMENTING ON THE PASS   ]
 ]           OVERRIDE DISPLAY BUT NOT ON THE BFS AND THE FACT THAT BFS ]
 ]           TURNS OFF THE OMS ENGINES AT ENGAGEMENT.                  ]
 ]                                                                     ]
 ] WINDOW 3: IF BFS IS ENGAGED IN A WINDOW BETWEEN PASS COMPLETION OF  ]
 ]           THE ATO OMS DUMP AND BFS INITIATION OF THE ATO OMS DUMP   ]
 ]           (ONLY POSSIBLE FOR ATO OMS DUMPS LESS THAN 30 SECONDS     ]
 ]           BEYOND THE PLANNED OMS ASSIST BURN DURATION), BFS WILL ADD]
 ]           30 ADDITIONAL SECONDS TO ITS 30 SECOND TIMER IT STARTED AT]
 ]           OMS ASSIST COMPLETION. UPON TIMER EXPIRATION, BFS WILL    ]
 ]           START A COMPLETE ATO OMS DUMP AS IF THE PASS ATO OMS DUMP ]
 ]           HAD NOT OCCURRED. THIS WINDOW WILL SHOW OMS TTG SET TO    ]
 ]           ZERO ON BOTH PASS AND BFS OVERRIDE DISPLAYS INITIALLY.    ]
 ]           BFS OMS TTG WILL JUMP TO THE ATO OMS DUMP VALUE AT BFS    ]
 ]           PERCEIVED ATO OMS DUMP START.                             ]
 ]                                                                     ]
 ]                                             (CONTINUED ON PAGE 3)   ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] WINDOW 2 USER RESPONSE: THE DUMP TIME WILL NEED TO BE ADJUSTED VIA  ]
 ]           ITEM 9 ON THE BFS OVERRIDE DISPLAY TO ACCOUNT FOR ANY ATO ]
 ]           OMS PREVIOUSLY DUMPED BY PASS. BE AWARE THE ATO OMS DUMP  ]
 ]           MAY BE DELAYED UP TO 60 SECONDS POST BFS ENGAGEMENT.      ]
 ]                                                                     ]
 ] WINDOW 3 USER RESPONSE: BE AWARE THAT SINCE PASS HAS ALREADY DUMPED ]
 ]           ALL REQUIRED ATO OMS, NO ADDITIONAL DUMPING IS REQUIRED   ]
 ]           BY BFS. THE BFS WILL ATTEMPT TO PERFORM A SECOND ATO OMS  ]
 ]           DUMP WHICH SHOULD BE INHIBITED VIA THE OVERRIDE DISPLAY.  ]
 ]           THE CREW WILL HAVE AT LEAST 30 SECONDS POST BFS ENGAGE TO ]
 ]           INHIBIT THE SECOND ATO OMS DUMP FROM STARTING.            ]
 ]_____________________________________________________________________]
 @




 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] SMS: B22630      ]
 ] RENE SAUSER        ]    BFS PROGRAM NOTE         ] DR:  109697      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:04/24/97    ]
 ] (562)922-2144      ]      RELEASE NOTE ( )       ]                  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ]    BFS MAY LAG PASS IN ATO OMS DUMPS ON OMS ASSISTED MISSIONS       ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ] WINDOW 4: IF BFS IS ENGAGED IN THE WINDOW BETWEEN BFS INITIATION OF ]
 ]           THE ATO OMS DUMP AND PASS COMPLETION OF THE ATO OMS DUMP, ]
 ]           BFS WILL, UPON ENGAGEMENT, PERFORM A CONTINUATION OF THE  ]
 ]           ATO OMS DUMP PASS STARTED FOR 30 SECONDS LONGER THAN RE-  ]
 ]           QUIRED. (THIS WINDOW EXISTS IN PLACE OF WINDOW 3 FOR ATO  ]
 ]           OMS DUMPS WITH A DURATION GREATER THAN 30 SECONDS BEYOND  ]
 ]           THE PLANNED OMS ASSIST DUMP DURATION). THIS WINDOW WILL BE]
 ]           NOTICEABLE VIA MONITORING THE OMS TTG SHOWING ZERO ON THE ]
 ]           BFS OVERRIDE DISPLAY WHILE STILL DECREMENTING ON THE PASS ]
 ]           OVERRIDE DISPLAY.                                         ]
 ]                                                                     ]
 ] WINDOW 5: THIS WINDOW EXTENDS FROM THE POINT WHERE PASS HAS COMPLET-]
 ]           ED THE ATO OMS DUMP BUT BFS STILL HAS 30 SECONDS OR LESS  ]
 ]           OF DUMP TIME REMAINING. IF ENGAGED IN THIS WINDOW, BFS    ]
 ]           WILL PERFORM A TURNOFF AND PURGE, SET ORBITER_DUMP_INH AND]
 ]           NOT PERFORM ANY ADDITIONAL AUTOMATIC OMS DUMPING. THE     ]
 ]           START OF THIS WINDOW IS NOTICEABLE VIA OBSERVANCE OF OMS  ]
 ]           TTG BECOMING ZERO ON THE PASS OVERRIDE DISPLAY BUT SHOWING]
 ]           GREATER THAN ZERO ON THE BFS OVERRIDE DISPLAY.            ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ] WINDOW 4 USER RESPONSE: BE AWARE THAT THE BFS WILL DUMP APPROXIMATE-]
 ]           LY 30 SECONDS MORE OMS THAN DESIRED IF ENGAGED IN THIS    ]
 ]           WINDOW. THE OMS QUANTITY TO BE DUMPED MAY BE ADJUSTED AS  ]
 ]           NEEDED VIA AN ITEM 9 ON THE BFS OVERRIDE DISPLAY OR THE   ]
 ]           DUMP MAY BE TERMINATED VIA AN ITEM 8.                     ]
 ]                                                                     ]
 ] WINDOW 5 USER RESPONSE: BE AWARE THAT SINCE PASS HAS ALREADY DUMPED ]
 ]           ALL REQUIRED ATO OMS, NO ADDITIONAL DUMPING IS REQUIRED   ]
 ]           BY BFS. THE BFS WILL PERFORM A TURNOFF AND PURGE AT       ]
 ]           ENGAGEMENT AND SET ORBITER_DUMP_INH. ANY ADDITIONAL DUMPS ]
 ]           WILL NEED TO BE INITIATED MANUALLY.                       ]
 ]                                                                     ]
 ] NOTE: DUMP TIMES ARE ADJUSTED BY ADJUSTING DUMP QUANTITY VIA ITEM 9 ]
 ] ON THE BFS OVERRIDE DISPLAY. INHIBITED DUMPS MAY BE MANUALLY ENABLED]
 ] VIA ITEMS 6 AND 7 ON THE BFS OVERRIDE DISPLAY (OMS_TTG WILL DEFAULT ]
 ] TO A VALUE BASED ON THE I-LOAD MANUAL_OMS_DT). DUMPS MAY BE TERMIN- ]
 ] ATED VIA AN ITEM 8 ON THE BFS OVERRIDE DISPLAY.                     ]
 ]_____________________________________________________________________]
 @
