 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS:  D023A      ]
 ] G.W. PHILLIPS      ]    BFS PROGRAM NOTE         ] DR:              ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] RI/D282-430/X3686  ]      RELEASE NOTE ( )       ] REV. 03/25/87    ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] ALL                           ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( )BSS( )GNC( )SEQ( )SMSP( )IPL( )DCP(X)] ALL                     ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  DCP (DCP 8.07)                                  ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: MG017300                                       ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]        DEU CRITICAL BITE AT MAJOR FUNCTION SWITCH CHANGES           ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]        WHEN THE MAJ FUNC SWITCH IS CHANGED, THERE IS A PROBABILITY  ]
 ] THAT THE MAJ FUNC SWITCH DATA WILL EXHIBIT A PARITY ERROR. IF THIS  ]
 ] HAPPENS, THE DCP WILL SET A CRITICAL BITE INDICATION. A POLL FAIL   ]
 ] MESSAGE WILL APPEAR ON A PFS CONTROLLED DEU. POLLING WILL CONTINUE  ]
 ] ON A BFS CONTROLLED DEU. THE PARITY ERROR IS A TEMPORARY CONDITION  ]
 ] AND RESETS WITHIN 2 MSEC OF THE ERRONEOUS INPUT.                    ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ]         UPON DIAGNOSIS OF A MAJOR FUNCTION SWITCH INDUCED MEMORY    ]
 ]   PARITY ERROR:                                                     ]
 ]                                                                     ]
 ]   A. BFS CONTROLLED DEU - RECYCLE DEU POWER.                        ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]      SEE SUPPLEMENTAL SHEET.                                        ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]RI: <S> R.E. CARTER       DATE 05/11/87]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 08/10/88]                             ]
 ]    --------------------      ---------] JACK BOYKIN        08/17/88 ]
 ]PF MGR: MICHAEL BRIEDEN   DATE 08/09/88]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
 @




 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] SMS:  D023A      ]
 ] G.W. PHILLIPS      ]    BFS PROGRAM NOTE         ] DR:              ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] RID/3686           ]      RELEASE NOTE ( )       ] REV. 03/26/87    ]
 ]____________________]_____________________________]__________________]
 ] TITLE: DEU CRITICAL BITE AT MAJOR FUNCTION SWITCH CHANGES           ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ]    B. PFS CONTROLLED DEU                                            ]
 ]                                                                     ]
 ]     1. RECYCLE POWER ON AFFECTED DEU.                               ]
 ]     2. ON ANOTHER DEU, RESELECT THE FAILED DEU WITH THE GPC/CRT KEY.]
 ]                                                                     ]
 ]         OR                                                          ]
 ]                                                                     ]
 ]                                                                     ]
 ]     1. KEY: ITEM A EXEC ON THE FAILED DEU (RE-INITIALIZES DEU).     ]
 ]     2. ON ANOTHER DEU, RESELECT THE FAILED DEU WITH THE GPC/CRT KEY.]
 ]                                                                     ]
 ]   IF THE FAILURE CONTINUES TO EXIST, THEN THERE MAY BE SOME OTHER   ]
 ]   PERMANENT PROBLEM AND NOT THE KNOWN MAJOR FUNCTION SWITCH PROBLEM.]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 @
