 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] R. MCALLISTER      ]    PASS PROGRAM NOTE        ]       44724      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] LSIS/282-7299      ]      RELEASE NOTE( )        ] REV A: 07/11/95  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 18 AND SUBS               ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G9                              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  IMU                                             ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.38, V5.1.8, V4.9A                            ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] IMU DOWNMODE FROM OPERATE TO STANDBY FOR DOUBLE BITE TEST 4 FAILURE ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] IF "BITE TEST 4" FAILS TWICE UPON TRANSITION TO G9, THE OPS CONTROL ]
 ] SEGMENT WILL SET THE IMU OPERATE COMMAND DISCRETES TO "ZERO"-SET    ]
 ] AND "ZERO"-RESET IN ORDER TO MAINTAIN THE OPERATE OR STANDBY        ]
 ] STATUS OF THE IMU ASSOCIATED WITH THE FAILED MDM, BUT THESE         ]
 ] DISCRETES ARE SUBSEQUENTLY COMPLEMENTED BY THE GN&C SOFTWARE, THUS  ]
 ] PRODUCING A "ZERO"-SET "ONE"-RESET PAIR THAT WILL CAUSE THE IMU TO  ]
 ] GO INTO STANDBY MODE.                                               ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ]  BE AWARE OF THIS AUTOMATIC IMU DOWNMODING FROM OPERATE TO STANDBY  ]
 ]  AFTER A DOUBLE "BITE TEST 4" FAILURE IN TRANSITION TO G9 AND       ]
 ]  PERFORM NECESSARY ACTIONS TO RECOVER IMU (DEPENDING ON FAILURE     ]
 ]  ENCOUNTERED).                                                      ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS:   JEAN L. ZOPHY     DATE 08/15/95]                             ]
 ]     -------------------      ---------]                             ]
 ]ASD:   ERIC C. BINGHAM    DATE 08/15/95]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 08/24/95 ]
 ]PF MGR:  OANH N. PHAM     DATE 08/21/95]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
 @
