 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] HIRAM THOMPSON     ]    PASS PROGRAM NOTE        ]       103439     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  04/04/89  ]
 ] LSIS/282-7225      ]      RELEASE NOTE( )        ] REV B: 09/11/95  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-7D AND SUBS                ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )] G1                              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  COMMFAULTS                                      ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  I/O                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]         EIU I/O ERRORS AND EIU BYPASS                               ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] AN UNPREDICTABLE NUMBER OF I/O ERRORS (0-18) MAY OCCUR WHEN THE     ]
 ] MAIN ENGINE CONTROLLERS (SSMEC) ARE POWERED OFF (NOMINALLY 15       ]
 ] TO 20 MINUTES INTO THE MISSION FOLLOWING ET SEP IN MM 104).  THE    ]
 ] OCCURRENCE OF ERRORS IS DEPENDENT ON THE TIMING OF THE SSMEC        ]
 ] POWER OFF WITH RESPECT TO THE TIMING OF I/O BETWEEN THE SSMEC       ]
 ] AND THE EIU.                                                        ]
 ]                                                                     ]
 ] THE ERRORS APPEAR AS "E-BIT" ERRORS AND MAY BE LOGGED ON THE HFE    ]
 ] EIU READS (ELEMS 1-6) OR THE MFE EIU READS (ELEMS 51-53), OR BOTH.  ]
 ]                                                                     ]
 ] USER NOTE 14403 DOCUMENTS THAT NO FSP MESSAGE IS ASSOCIATED WITH    ]
 ] THESE ERRORS.                                                       ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] THE USER SHOULD BE AWARE THAT POWERING OFF THE MAIN ENGINE          ]
 ] CONTROLLERS ON PANEL R2 CAN RESULT IN MULTIBUS I/O ERRORS.          ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS:  HUGH D. STOVALL    DATE 11/21/95]                             ]
 ]     -------------------      ---------]                             ]
 ]ASD:   ERIC C. BINGHAM    DATE 11/21/95]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 12/01/95 ]
 ]PF MGR: KAYLENE F. KINDT  DATE 11/30/95]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
 @
