 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] ENRIQUE ORTIZ      ]    PASS PROGRAM NOTE        ]     28350        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: JULY 1987  ]
 ] LSIS/282-7497      ]      RELEASE NOTE( )        ] REV B: 12/08/94  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 19 AND SUBS               ]  CREW ( )  GROUND (X)  DUMP ONLY (X)]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC ( )  VU ( )  SM/PL ( )]  0, G2, G3, G8, G9              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: FTS, LDB, ICC, I/O, TRANSITIONS                  ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: SDPS, SLDB                                     ]
 ]_____________________________________________________________________]
 ] TITLE:  POSSIBLE FAIL-TO-SYNC DUE TO LDB ERRORS AND ICC OVERLOAD    ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ] CONTINUOUS LDB ERRORS AND SUBSEQUENT TOGGLING CAUSE 3 ICC MESSAGES  ]
 ] PER ICC CYCLE. IN A NORMAL SITUATION, DISSIMILAR ICC PROCESSING     ]
 ] MAY BE REQUIRED IN A RS DUE TO UNIQUE I/O ERRORS. TO AVOID DIVERGENT]
 ] PROCESSING SUFFICIENT TO CAUSE F-T-S, SIP PROCESSES NO MORE THAN    ]
 ] 3 ICC MESSAGES PER COLLECTION CYCLE, WHICH MEANS THAT SOME DATA     ]
 ] NEVER GETS ICC'D IN A CONTINUOUS LDB ERROR CONDITION. A RS F-T-S    ]
 ] WILL OCCUR IF THIS CONDITION IS PRESENT:                            ]
 ]                                                                     ]
 ] A.  AT OPS TRANSITION WITH SECONDARY GPC'S, OR ,                    ]
 ]                                                                     ]
 ] B.  WHEN A NEW GPC IS ADDED TO CS (NOTE: I/O TALK BACK WILL REMAIN  ]
 ]     BARBERPOLE.  IF AN ATTEMPT IS MADE TO FORM A RS WITH THIS GPC   ]
 ]     OR ADD THIS GPC TO AN EXISTING RS, A F-T-S WILL OCCUR AT THE OPS]
 ]     TRANSITION).                                                    ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ] LDB POLLING IS NOMINALLY DISABLED IN OPS G2, G3, & G8, BUT MAY BE   ]
 ] ENABLED DURING LAB OPERATIONS OR DURING SOME ORBITER SPECIAL TEST   ]
 ] CONFIGURATIONS.                                                     ]
 ]                                                                     ]
 ] IF THIS LDB ERROR CONDITION IS PRESENT, LDB POLLING SHOULD BE DIS-  ]
 ] ABLED VIA SPEC 100 OR SPEC 1 BEFORE THE OPS REQUEST IS ENTERED OR   ]
 ] A NEW GPC IS BROUGHT INTO THE COMMON SET.                           ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS    JEAN L. ZOPHY     DATE 01/10/95]                             ]
 ]     -------------------      ---------]                             ]
 ]ASD:   ERIC C. BINGHAM    DATE 01/10/95]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 01/13/95 ]
 ]PF MGR: KAYLENE F. KINDT  DATE 01/11/95]------------------- -------- ]
 ]       ------------------     ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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