 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] R W. MCALLISTER    ]    PASS PROGRAM NOTE        ]    47741 *       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] ENG/282-8428       ]      RELEASE NOTE( )        ] REV A: JULY 1989 ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 19 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, 4.38                                    ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] FALSE IMU BITE TEST FAILURES                                        ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:  * DR47752                                             ]
 ] A. COMMFAULTS OCCURRING DURING OPS 1 AND OPS 3 MAY CAUSE THE        ]
 ]    SUPPRESSION OF TRUE RESOLVER LIMIT TEST FAILURES (IMU BITE       ]
 ]    PROCESSING). THIS MAY HAPPEN BECAUSE DATA USED IN BITE           ]
 ]    PROCESSING IS SOMETIMES "OLD" WITH RESPECT TO THE COMMFAULT      ]
 ]    STATUS WORD. IN BITE PROCESSING THE CURRENT COMMFAULT STATUS     ]
 ]    IS USED TO DETERMINE WHETHER TO PROCESS THIS OLD (BUT VALID)     ]
 ]    DATA. THEREFORE, VALID BUT OUT-OF TOLERANCE DATA WILL NOT BE     ]
 ]    PROCESSED.                                                       ]
 ]                                                                     ]
 ] B. ALL RESOLVER DATA FOR COMMFAULTED IMU'S ARE EXTRAPOLATED. THE    ]
 ]    INNER RESOLVER NULL TEST (IMU BITE PROCESSING) COMPARES THE      ]
 ]    INNER RESOLVER ANGLE (EXTRAPOLATED DURING COMMFAULT) TO A FIXED  ]
 ]    LIMIT. THEREFORE, WHEN A COMMFAULT EXISTS FOR A LONG PERIOD OF   ]
 ]    TIME, FALSE INNER RESOLVER NULL FAILURES MAY BE DECLARED (IMU    ]
 ]    BITE/T MESSAGE ANNUNCIATED).                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ] BE AWARE THAT,                                                      ]
 ]                                                                     ]
 ] A. TRUE IMU FAILURES MAY NOT BE ANNUNCIATED WHEN TEMPORARY          ]
 ]    COMMFAULTS OCCURS.                                               ]
 ]                                                                     ]
 ] B. DURING PERIODS OF LONG TERM COMMFAULTS (IMU I/O BYPASSED),       ]
 ]    FALSE "IMU BITE/T" MESSAGES MAY BE ANNUNCIATED.                  ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 09/06/89]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 09/11/89]                             ]
 ]    --------------------      ---------] M.C. GREMILLION    10/02/89 ]
 ]PF MGR:J.R. THIBODEAU,III DATE 09/29/89]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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