 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] N.N. PARKER        ]    PASS PROGRAM NOTE        ]     105141 *     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE (X)  USER NOTE ( ) ] DATE: 09/17/91   ]
 ] IBM/282-8429       ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-8F THRU OI-22              ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G2, G3, G9                      ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  IMU                                             ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: V4.11C, 6.26, V5.1.8                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]   TIMER NOT RESET WHEN A REQUEST IS MADE TO MODE AN IMU TO OPERATE  ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:   *DR037522 (USER NOTE)                                ]
 ]                                                                     ]
 ] THE TIMER REFLECTING ELAPSED TIME SINCE THE MOST RECENT IMU OPERATE ]
 ] REQUEST IS NOT RESET WHEN A NEW OPERATE REQUEST IS PROCESSED.  THIS ]
 ] MAY RESULT IN THE IMU IN-OPERATE BIT BEING SET PREMATURELY (I.E.,   ]
 ] BEFORE THE IMU HAS COMPLETED ITS "RUNUP SEQUENCE") ALLOWING BAD IMU ]
 ] DATA TO BE USED WHICH MAY CAUSE TRANSIENT IMU BITE INDICATIONS.     ]
 ]                                                                     ]
 ] DUE TO THE LATCHING OF THE IMU IN-OPERATE BIT AS DOCUMENTED BY THE  ]
 ] USER NOTE FOR DR037522, THIS PROBLEM IS ONLY VISIBLE WHEN AN IMU HAS]
 ] NOT ACHIEVED THE IN-OPERATE STATE SINCE THE LAST GNC MFB OVERLAY AND]
 ] THEN MULTIPLE REQUESTS ARE MADE TO MODE THAT IMU TO OPERATE BEFORE  ]
 ] IT ACTUALLY ACHIEVES THE IN-OPERATE STATE.                          ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] AVOID THE ABOVE SCENARIO.  IF THIS PROBLEM OCCURS, THE RECOVERY     ]
 ] PROCEDURES DOCUMENTED IN THE USER NOTE FOR DR037522 SHOULD BE       ]
 ] FOLLOWED.                                                           ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: PATTI A. THORNTON    DATE 11/05/91]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 11/05/91]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER  11/06/91]
 ]PF MGR: JOSEPH THIBODEAU  DATE 11/06/91]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]PF6.26: MICHAEL J. JONES  DATE 11/06/91]                             ]
 ]_______________________________________]_____________________________]
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