1+_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] M. A. BEIMS        ]    PASS PROGRAM NOTE        ]       43940  *   ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  SEPT. 1987]
 ] IBM/282-8662       ]      RELEASE NOTE( )        ] REV B: APRIL 1992]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-06 AND SUBS                ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G1, G6, G2, G3, G8, G9          ]
 ]___________________________________]_________________________________]
 ] SOFTWARE SUB-AREA:  IMU                                             ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  V4.9A, 4.72, 4.38                             ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] FALSE REDUNDANT GYRO OR VELOCITY OVER LIMIT BITE FAILURE            ]
 ] ANNUNCIATION                                                        ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:  * DR50235, DR56091, DR107131                          ]
 ]                                                                     ]
 ] WHEN IMU IS COMMFAULTED, THE FSW LINEARLY EXTRAPOLATES REDUNDANT    ]
 ] GYRO INPUT DATA AND THE ACCELEROMETER PULSES FROM THE LAST TWO GOOD ]
 ] READS.  THIS CAN CAUSE FALSE REDUNDANT GYRO OR VELOCITY OVER LIMIT  ]
 ] BITE FAILURE MESSAGES FOR ONE CYCLE OF PROCESSING SHORTLY AFTER     ]
 ] CLEARING A COMMFAULT.  SIMILARLY, A ONE-PASS BITE DECLARATION IS    ]
 ] POSSIBLE IMMEDIATELY AFTER MODING AN IMU FROM STANDBY TO OPERATE,   ]
 ] SINCE BITE PROCESSING IS COMPARING CURRENT IMU OUTPUT TO OLD OR     ]
 ] INITIALIZED VALUES.                                                 ]
 ] A CONTINUING FALSE VELOCITY OVER LIMIT BITE FAILURE IS POSSIBLE FOR ]
 ] A COMMFAULTED IMU UPON TRANSITION FROM MAJOR MODE 102 TO 103, MM 103]
 ] (POST-MECO) TO OPS 6 OR FROM MAJOR MODE 303 TO 304.                 ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] NONE REQUIRED.  FAILURE FLAGS ARE TRANSIENT AND WILL CLEAR ON NEXT  ]
 ] EXECUTION AFTER COMMFAULT IS CLEARED.                               ]
 ] MESSAGE MAY BE CLEARED FROM DISPLAY BY A MESSAGE RESET.             ]
 ]                                                                     ]
 ] THE RM SELECTION/DESELECTION STATUS OF AN IMU HAS NO EFFECT ON THESE]
 ] ANNUNCIATIONS.  THE ANNUNCIATIONS MAY BE PREVENTED BY USING THE     ]
 ] IMU BITE MASK GMEM (CR 89595A).                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM:   JEAN L. ZOPHY      DATE 07/14/92]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:  ROBERT N. HINSON   DATE 07/20/92]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 08/17/92 ]
 ]PF MGR: MOISES N. MONTEZ  DATE 07/23/92]------------------- -------- ]
 ]         OANH N. PHAM          07/28/92] CHAIRMAN, SASCB      DATE   ]
 ]                                       ]                             ]
 ]_______________________________________]_____________________________]
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