 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] M. BEIMS           ]    PASS PROGRAM NOTE        ]     42574        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] IBM/282-8662       ]      RELEASE NOTE( )        ] REV A: 12/09/91  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI22 AND SUBS                 ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G1, G9                          ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  IMU, TRANSITIONS                                ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.38                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] POTENTIAL FALSE IMU BITE/T MSG AT G9 TO G1 TRANSITION               ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]                                                                     ]
 ] THERE IS CODE IN THE G1 TRANSITION PROCESSING TO MODE THE IMU'S TO  ]
 ] "LOW GAIN" AT THE ENTRY TO OPS 1 IF THE MODE WAS "HIGH GAIN" WHEN   ]
 ] G9 WAS EXITED - (NOTE THAT THIS WOULD ONLY BE TRUE IN A NON-FLIGHT  ]
 ] SCENARIO WHERE AN ALIGNMENT HAD NOT BEEN PERFORMED IN G9 PRIOR TO   ]
 ] THE FIRST TRANSITION INTO OPS 1).                                   ]
 ]                                                                     ]
 ] IN THIS CASE DUE TO THE PHASING BETWEEN THE HIGH-FREQUENCY AND MID- ]
 ] FREQUENCY EXECUTIVES, THE (MFE) IMU PROCESSING EXECUTES EXPECTING   ]
 ] THE IMU'S ALREADY TO BE IN THE "LOW GAIN" MODE ON THE FIRST PASS,   ]
 ] SLIGHTLY BEFORE THE (HFE) OUTPUTS TO COMMAND THE HDW TO "LOW GAIN"  ]
 ] HAVE ACTUALLY OCCURRED.  IF THIS IS THE CASE, AND IF ONE OF THE IMU ]
 ] AXIS IS ALIGNED SUFFICIENTLY NEAR THE GRAVITY VECTOR DIRECTION, THE ]
 ] IMU VELOCITY OVERLIMIT BITE FAILURE THRESHOLD WILL BE EXCEEDED AND  ]
 ] A FALSE IMU BITE/T ANNUNCIATION WILL BE ISSUED.                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] IGNORE IMU BITE/T ANNUNCIATION AT G9 TO G1 TRANSITION IF AN IMU     ]
 ] ALIGNMENT WAS NOT PERFORMED PRIOR TO THE FIRST TRANSITION INTO G1.  ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: PATTI A. THORNTON    DATE 02/04/92]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:  ROBERT N. HINSON   DATE 02/19/92]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 02/27/92 ]
 ]PF MGR: JOSEPH THIBODEAU  DATE 02/26/92]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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