 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] J. ZOPHY           ]    PASS PROGRAM NOTE        ]    42085         ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT 1987  ]
 ] ENG/282-8409       ]      RELEASE NOTE( )        ] REV A: 10/31/89  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI02 AND SUBS                 ]  CREW (X)  GROUND ( )  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G2, G8                          ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: ADI, RCS, FCS                                    ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.35, 4.169                                    ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] ERRONEOUS ATTITUDE RATE INDICATION ON ADI WITH RJD'S OFF            ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] PER REQUIREMENTS, CURRENT GN&C PASS SOFTWARE DOES NOT DESELECT THE  ]
 ] RCS JETS ASSOCIATED WITH POWERED-OFF REACTION JET DRIVERS           ]
 ] (RJD) FROM THE JET AVAILABILITY TABLE; CONSEQUENTLY,                ]
 ] THOSE JETS MAY BE COMMANDED TO FIRE BY THE ON-ORBIT DAP. IN THAT    ]
 ] EVENT, THE ON-ORBIT DAP WILL COMPUTE AN EXPECTED ATTITUDE RATE IN   ]
 ] ITS STATE ESTIMATOR LOGIC AND WILL PASS THAT VALUE TO THE ADI FOR   ]
 ] DISPLAY. THIS DISPLAY IS ERRONEOUS BECAUSE, DUE TO THE "RJD         ]
 ] POWERED-OFF CONDITION". THE JETS ARE NOT FIRED AND THE EXPECTED     ]
 ] ATTITUDE RATE IS NOT ACTUALLY IMPOSED IN THE VEHICLE (THE RATE      ]
 ] DISPLAYED IS A PREDICTED RATE, NOT A MEASURED RATE). THIS           ]
 ] ERRONEOUS INDICATION WILL PERSIST FOR LESS THAN 1 SEC (3 RM CYCLES) ]
 ] UNTIL THE COMMANDED JET(S) IS FAILED AND DESELECTED BY RM.          ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] BE AWARE THAT THE ADI ATTITUDE RATE MAY BE IN ERROR UNTIL JETS ARE  ]
 ] DESELECTED BY RM IF AN RJD IS POWERED OFF.                          ]
 ]                                                                     ]
 ] THE ERRONEOUS ADI ATTITUDE RATE DISPLAY MAY BE AVOIDED BY MANUALLY  ]
 ] DESELECTING THE JETS ASSOCIATED WITH THE POWERED-OFF RJD.           ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 11/30/89]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 12/01/89]                             ]
 ]    --------------------      ---------]M.C. GREMILLION     12/07/89 ]
 ]PF MGR:K.L. LINDSAY       DATE 12/06/89]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]4.169  A.T. HIEMER            12/07/89 ]                             ]
 ]_______________________________________]_____________________________]
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