 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] M. BEIMS           ]    PASS PROGRAM NOTE        ]      37522       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] IBM/282-8662       ]      RELEASE NOTE( )        ] REV A: 09/30/91  ]
 ]____________________]_____________________________]__________________]
 ] 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 ( )] G2, G3, G9                      ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: IMU                                              ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 5.1, V5.1.8, V4.9A, 6.26                       ]
 ]_____________________________________________________________________]
 ]TITLE:ONCE THE IMU SOFTWARE IN-OPERATE IS SET, IT WILL NEVER BE RESET]
 ]_____________________________________________________________________]
 ] DESCRIPTION:    AFTER AN IMU HAS ACHIEVED THE IN-OPERATE STATE, ITS ]
 ] OPERATE BIT IS LATCHED 'ON'.  THIS INDICATES TO THE IMU SOP THAT    ]
 ] THE IMU HAS ACHIEVED THE IN-OPERATE STATE.  THIS BIT IS THEN ANDED  ]
 ] WITH THE SELECT STATUS TO DETERMINE WHICH IMU'S ARE AVAILABLE FOR   ]
 ] IMU SOP SUBMODES, (I.E., H CAL A, GCA). AFTERWARDS, WHEN AN IMU     ]
 ] IS PLACED IN THE STANDBY STATE THE SOFTWARE IN-OPERATE REMAINS ON.  ]
 ]                                                                     ]
 ] AS A RESULT, IT IS POSSIBLE TO SELECT AN IMU FOR USE IN A SUBMODE   ]
 ] BEFORE THE HARDWARE OPERATE SEQUENCE IS FINISHED, BY PLACING THE    ]
 ] IMU IN STANDBY AND THEN LATER COMMANDING THE IMU TO OPERATE MODE,   ]
 ] PERFORMING AN I/O RESET, AND SELECTING THE IMU FOR USE IN THE SUB-  ]
 ] MODE.  (IF THE BITE STAT FIELD DOES NOT EQUAL '3F' ON SPEC 104 OR   ]
 ] AN ASTERISK APPEARS BY THE STBY ITEM ON SPEC 21, THE IMU HAS NOT    ]
 ] COMPLETED ITS MODING TO OPERATE).                                   ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:  BEFORE "SELECTING" AN IMU FOR A SUBMODE:            ]
 ] PRE-LAUNCH:  ASSURE THAT THE DESIRED IMU DISPLAYS A STAT = '3F'     ]
 ]              ON SPEC 104.                                           ]
 ] FLIGHT: ASSURE THAT AN ASTERISK IS BESIDE THE OPER ITEM FOR THE     ]
 ]         DESIRED IMU ON SPEC 21.                                     ]
 ]                                                                     ]
 ]      IF AN IMU HAS BEEN SELECTED FOR USE IN A SUBMODE BEFORE THE    ]
 ]     HARDWARE HAS MODED TO OPERATE THE USER SHOULD REFER TO          ]
 ]     STANDARD RECOVERY PROCEDURES.                                   ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]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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