 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS: B08101      ]
 ] D.L. ENTWISTLE     ]    BFS PROGRAM NOTE         ]                  ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] RI/DNY     2634    ]      RELEASE NOTE ( )       ] 08/05/81         ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]     11.24C AND SUBS           ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( ) BSS(X) GNC( ) SEQ( ) SM/SP( ) IPL( )]      1                  ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  ASCENT                                          ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: MG038101/3.8.1                                 ]
 ]_____________________________________________________________________]
 ] TITLE:  MET VALUE AT TRANSITION TO MAJOR MODE 102                   ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]  BFS MET STARTS COUNTING AT TRANSITION TO MAJOR MODE 102            ]
 ]  AS DETERMINED BY SRB CHAMBER PRESSURE GREATER THAN 50 PSI          ]
 ]  OR 3 SSME'S AT 90% CHAMBER PRESSURE PLUS 3.2 SECONDS.              ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]  THE BFS TRANSITIONS INTO MAJOR MODE 102 AS A FUNCTION OF           ]
 ]  BUILD-UP OF SRB CHAMBER PRESSURE.  A BIAS OF +160 MSEC             ]
 ]  IS ADDED TO THE BFS VALUE OF MET SUCH THAT THE MET VALUE           ]
 ]  IN BFS CORRESPONDS MORE CLOSELY TO THE PFS MET VALUE               ]
 ]  (ESTIMATED TIME OF CHAMBER PRESSURE BUILD-UP TO 50                 ]
 ]  PSIA).  THE BFS VALUE OF MET IS INITIALIZED TO A VALUE             ]
 ]  OF 160 MSEC IN MAJOR MODE 101.  THIS VALUE WILL APPEAR             ]
 ]  IN THE BFS DOWNLIST DURING MAJOR MODE 101.  WHEN THE SRB           ]
 ]  CHAMBER PRESSURE EXCEEDS 50 PSIA, THE BFS TRANSITIONS TO           ]
 ]  MAJOR MODE 102 AND THE MET INCREMENTS FROM THE VALUE OF            ]
 ]  160 MSEC.                                                          ]
 ]  IF TWO GPC STRINGS ARE LOST IMMEDIATELY AFTER SRB                  ]
 ]  IGNITION, THE BFS WILL TRANSITION TO MM102 BASED ON 90%            ]
 ]  SSME CHAMBER PRESSURE +3.2 SECONDS DELAY.  THIS WOULD              ]
 ]  CAUSE AN ERROR IN BFS MET OF 200 TO 600 MILLISECONDS,              ]
 ]  DEPENDING HOW FAST ALL THREE SSME'S REACHED 90% CHAMBER PRESSURE.  ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]RI:<S>D.L. ENTWISTLE      DATE 08/07/81]                             ]
 ] --------------------         ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 7/28/88 ]                             ]
 ] --------------------         ---------] RW MOOREHEAD        7/30/88 ]
 ]PF MGR: GENE MCSWAIN      DATE 7/29/88 ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
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