 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ]  J. W. MAGLEY      ]    PASS PROGRAM NOTE        ]    57382         ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 12/04/84   ]
 ]  IBM/282-8939      ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] STS-51C AND SUBS              ]  CREW (X)  GROUND ( )  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )]       G8                        ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: IMU, ADI, RM                                     ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.97, 4.72                                     ]
 ]_____________________________________________________________________]
 ] TITLE:   ADI ATTITUDE FLAG VALID FOR INVALID ADI DATA IN OPS 8      ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]    IN OPS 2, THE ADI ATTITUDE FLAG (ADI_ATT) IS SET TO INVALID IF   ]
 ]NO IMU'S ARE AVAILABLE.  THIS CAUSES DISPLAY OF THE "OFF" FLAG FOR   ]
 ]EACH ADI.  IN OPS 8, HOWEVER, LOSS OF IMU DATA (DUE TO COMM-FAULTS)  ]
 ]WILL NOT CAUSE ADI_ATT TO BE SET INVALID AND THE "OFF" FLAG WILL NOT ]
 ]BE DISPLAYED.  IF IMU DATA IS LOST DUE TO A COMM-FAULT, THE ATTITUDE ]
 ]DATA SENT TO THE ADIS WHILE NO IMU DATA IS AVAILABLE WILL BE EXTRA-  ]
 ]POLATED BASED ON THE LAST TWO GOOD IMU DATA CYCLES PRIOR TO THE LOSS ]
 ]OF IMU DATA.                                                         ]
 ]                                                                     ]
 ]    IF, IN OPS 8, NO IMUS ARE AVAILABLE FOR OTHER REASONS (I.E., IMU ]
 ]FAILED DUE TO BITE FAILURE OR IMU DESELECTED BY CREW), THE DATA      ]
 ](POSSIBLY BAD) FROM THE LAST SELECTED IMU (THE ONE FAILED DUE TO BITE]
 ]OR DESELECTED BY CREW DESELECT) WILL CONTINUE TO BE PROCESSED AND ITS]
 ]DATA WILL BE DISPLAYED BY ADIS.  THE ADI "OFF" FLAG WILL NOT BE DIS- ]
 ]PLAYED EVEN THOUGH IMU RM NO LONGER IS MONITORING THE IMU DATA.      ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]    BE AWARE THAT A LOSS OF IMU DATA IN OPS 8 WILL NOT BE INDICATED  ]
 ]BY DISPLAY OF THE "OFF" INDICATORS FOR EACH ADI.                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 7/28/88 ]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 7/28/88 ]                             ]
 ]    --------------------      ---------] RW MOOREHEAD        7/30/88 ]
 ]PF MGR: MOISES MONTEZ     DATE 7/29/88 ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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