1+_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] VALERIE MATTHEWS   ]    PASS PROGRAM NOTE        ]       107106     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] LSIS/282-8552      ]      RELEASE NOTE( )        ]       04/11/94   ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-21 AND SUBS                ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )]  G9, G1                         ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: FCOS, DOWNLIST                                   ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: STIM                                           ]
 ]_____________________________________________________________________]
 ] TITLE:  INCORRECT MET REF TIME DISPLAYED                            ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] WHILE STILL IN SIMPLEX G9 CONFIGURATION, MTU MET IS UPDATED (VIA    ]
 ] SPEC 2) TO REFLECT CURRENT MTU GMT. BASED ON THE DELTA UPDATE TIME, ]
 ] THESE PRELAUNCH COMMANDS CAN CAUSE THE MTU MET VALUE TO BE SLIGHTLY ]
 ] GREATER THAN THE MTU GMT VALUE SUCH THAT WHEN MTU MET IS SUBTRACTED ]
 ] FROM MTU GMT THE RESULTING MET REFERENCE TIME IS NEGATIVE. (MET     ]
 ] REFERENCE-V91W1998CX IS DEFINED AS DATA TYPE BSU - PACKED BIT STRING]
 ] UNSIGNED)                                                           ]
 ]                                                                     ]
 ] AT LIFTOFF, THE T-0 GMT IS PLACED IN THE MET REFERENCE TIME AND IS  ]
 ] USED FOR ALL SUBSEQUENT MET CALCULATIONS.  MET IS CALCULATED BY     ]
 ] SUBTRACTING MET REFERENCE TIME FROM THE CURRENT GMT.                ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] BE AWARE OF THIS CONDITION.  PRELAUNCH USER COMMANDS THAT UPDATE    ]
 ] MTU MET TO BE SLIGHTLY LESS THAN MTU GMT WILL RESULT IN A PRELAUNCH ]
 ] MET REFERENCE TIME SLIGHTLY GREATER THAN ZERO (WHICH WHEN DOWNLISTED]
 ] IS DISPLAYED ON THE GROUND CORRECTLY).  IF THE MET REFERENCE TIME IS]
 ] NEGATIVE, THE DOWNLISTED MET REFERENCE TIME WILL NOT BE DISPLAYED ON]
 ] THE GROUND PROPERLY (THE MET REFERENCE TIME VALUE IS NOT DESIGNATED ]
 ] AS A NEGATIVE VALUE, AND THE GROUND SOFTWARE NOT EXPECTING A        ]
 ] NEGATIVE VALUE WILL INTERPRET A NEGATIVE VALUE OF TIME AS A LARGE   ]
 ] NUMBER AND TRUNCATE IT).                                            ]
 ]                                                                     ]
 ]                -  CONTINUED ON SUPPLEMENT PAGE -                    ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS:  JEAN L. ZOPHY      DATE 06/14/94]                             ]
 ]     -------------------      ---------]                             ]
 ]FDSD:  W. R. PRUETT       DATE 06/14/94]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 06/16/94 ]
 ]PF MGR: KAYLENE F. KINDT  DATE 06/14/94]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
 @





 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] DR:              ]
 ] VALERIE MATTHEWS   ]    PASS PROGRAM NOTE        ]       107106     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] LSIS/282-8552      ]      RELEASE NOTE( )        ]       04/11/94   ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ]         INCORRECT MET REF TIME DISPLAYED                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] THERE ARE THREE USES OF MET REFERENCE TIME PRE-LAUNCH:              ]
 ]                                                                     ]
 ]    1)  DOWNLISTED TO THE GROUND MCC DISPLAYS                        ]
 ]    2)  USED IN THE FSW CALCULATION OF MET FOR DEU TIME FILLS        ]
 ]    3)  USED IN THE FSW CALCULATION OF MET FOR FAULT MESSAGE TIME    ]
 ]        TAGS                                                         ]
 ]                                                                     ]
 ] FOR THESE THREE USES, CURRENT MET IS EQUAL TO PRE-LAUNCH CURRENT    ]
 ] GMT DUE TO THE SUBTRACTION OF MET REFERENCE TIME FROM PRE-LAUNCH    ]
 ] CURRENT GMT (RESULTING IN A CORRECT MET FOR EACH USE).              ]
 ]                                                                     ]
 ] NOTE:  THE ABOVE IS TRUE EVEN IN THE CASE WHERE MET REFERENCE TIME  ]
 ] IS SLIGHTLY NEGATIVE CAUSING IT TO BE IMPROPERLY DISPLAYED ON THE   ]
 ] GROUND MCC DISPLAYS.                                                ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 @
