 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] TREVOR TIDWELL     ]    PASS PROGRAM NOTE        ]     108076       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE (X)  USER NOTE ( ) ] DATE:            ]
 ] SSOAS/(281)335-2214]      RELEASE NOTE( )        ]   2/12/98        ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI25 THROUGH OI28            ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )]      G2, G3                     ]
 ]___________________________________]_________________________________]
 ] SOFTWARE SUB-AREA: IMU                                              ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.208                                          ]
 ]_____________________________________________________________________]
 ] TITLE: UNEXPECTED SLEW WHEN NO IMU SELECTED FOR IMU/IMU ALIGNMENT   ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] WHEN AN IMU TO IMU ALIGNMENT IS EXECUTED, BUT NO IMU HAS BEEN       ]
 ] SELECTED FOR ALIGNMENT VIA SPEC 21, AN INCORRECT REPOSITIONING OF   ]
 ] THE NON-REFERENCE IMUS WILL RESULT.  THE IMPROPER IMU SLEWING MAY   ]
 ] ALSO CAUSE IMU BITE MESSAGE ANNUNCIATIONS AND UNINTENDED RCS JET    ]
 ] FIRINGS.                                                            ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] IF THIS PROBLEM OCCURS, ONLY THE NON-REFERENCE IMUS SHOULD BE       ]
 ] SELECTED FOR A SECOND ALIGNMENT.  INITIATE THE SECOND ALIGNMENT.    ]
 ] THIS ATTEMPT WILL NOT ALIGN THE SELECTED IMUS TO THE REFERENCE IMU, ]
 ] BUT IT WILL RESET THE FLIGHT SOFTWARE.  EXECUTION OF A THIRD        ]
 ] IMU/IMU ALIGNMENT IS REQUIRED TO CORRECTLY ALIGN THE NON-REFERENCE  ]
 ] IMUS.                                                               ]
 ]                                                                     ]
 ] IF UNINTENDED RCS JET FIRINGS DO OCCUR, IT MAY BE NECESSARY FOR THE ]
 ] CREW TO MODE THE DAP TO FREE, DESELECT IMPROPERLY SLEWING IMUS AND  ]
 ] THEN MODE BACK TO THE ORIGINAL DAP SETTING.                         ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]SSOAS:  JOHN MAGLEY       DATE 04/07/98]                             ]
 ]      ------------------      ---------]                             ]
 ]ASD:   ERIC C. BINGHAM    DATE 04/08/98]                             ]
 ]      ------------------      ---------] DARRELL E. STAMPER 04/09/98 ]
 ]PF MGR:<S> D. A. HILTS    DATE 04/02/98]------------------- -------- ]
 ]      ------------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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