 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ]  CHARLIE RANDALL   ]    PASS PROGRAM NOTE        ]        107240    ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ]  LSIS/282-7458     ]      RELEASE NOTE( )        ]        03/13/96  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI-23 AND SUBS               ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC ( )  VU (X)  SM/PL ( )]   G9                            ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: ECP, SPEC, TCS                                   ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: V5.1.11, V5.1.16                               ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]   UNEXPECTED SUSPENSION OF SPEC 105 - INITIATED TCS SEQUENCE        ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] SPEC 105 (TCS CONTROL) AND SPEC 113 (ACTUATOR CONTROL) ARE UNIQUE   ]
 ] VU S/W TOOLS WHICH CAN INITIATE ECPS FOR ACTUATOR CONTROL (ALL ECPS ]
 ] MAY BE EXECUTED VIA TCS SEQUENCE ON SPEC 105; A SUBSET OF ECPS MAY  ]
 ] BE EXECUTED VIA ITEM ENTRY ON SPEC 113). BOTH SPECS ACCESS THE SAME ]
 ] ECP SOFTWARE. HOWEVER, NEITHER THE REQUIREMENTS NOR THE DESIGN      ]
 ] CONSIDER THE CONSEQUENCES OF EXECUTING AN ECP ON ONE OR BOTH SPECS  ]
 ] WHEN BOTH SPECS ARE UP AT THE SAME TIME. THIS CAN LEAD TO ANY       ]
 ] NUMBER OF POTENTIAL CONFLICTS, ONE OF WHICH WAS SEEN WITH DR107240. ]
 ]                                                                     ]
 ] THE CONFLICT UNCOVERED BY DR107240 IS AS FOLLOWS:                   ]
 ]    A SPEC 105-INITIATED TCS SEQUENCE MAY UNEXPECTEDLY SUSPEND IF    ]
 ]    (1) AN AI, RFG, FRT, MAT OR BFD ECP IS EXECUTED BY A TCS         ]
 ]    OPERATOR IN A SPEC 105-INITIATED TCS SEQUENCE, AND               ]
 ]    (2) AN AI, RFG OR BFD ECP IS SUBSEQUENTLY EXECUTED FROM SPEC 113 ]
 ]    AND ENCOUNTERS AN ERROR. IF THE SEQUENCE IS ACTIVE OR RESUMED,   ]
 ]    IT WILL SUSPEND AFTER THE NEXT OPERATOR.                         ]
 ]                                                                     ]
 ]                  - CONTINUED ON SUPPLEMENT PAGE -                   ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] THE USER SHOULD NOT PERFORM ECP OPERATIONS ON EITHER SPEC 105 OR    ]
 ] SPEC 113 WHEN BOTH SPECS ARE UP AT THE SAME TIME.                   ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS:   JEAN L. ZOPHY     DATE 05/07/96]                             ]
 ]     -------------------      ---------]                             ]
 ]ASD:   ERIC C. BINGHAM    DATE 05/07/96]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 05/09/96 ]
 ]PF MGR: ERIC C. BINGHAM   DATE 05/07/96]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
 @



 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] DR:              ]
 ]  CHARLIE RANDALL   ]    PASS PROGRAM NOTE        ]        107240    ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ]  LSIS/282-7458     ]      RELEASE NOTE( )        ]        03/13/96  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ]  UNEXPECTED SUSPENSION OF SPEC 105 - INITIATED TCS SEQUENCE         ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]    THIS HAPPENS BECAUSE CERTAIN FLAGS ARE SET IF A SPEC 105-        ]
 ]    INITIATED TCS SEQUENCE IS RUNNING.  WHEN THE ECP ERROR ROUTINE   ]
 ]    (WHICH IS EXECUTING BECAUSE OF THE ERROR ENCOUNTERED ON SPEC     ]
 ]    113) SEES THAT THOSE SPEC 105 FLAGS ARE SET, IT SETS A SPEC      ]
 ]    105 HALT FLAG. THE SPEC 105 HALT FLAG IS NOT PROCESSED UNTIL     ]
 ]    AFTER THE NEXT TCS OPERATOR IS EXECUTED.                         ]
 ]                                                                     ]
 ]    ADDITIONALLY, IN THE ABOVE SCENARIO, WHEN THE ECP ERROR OCCURS   ]
 ]    ON SPEC 113, THE ECP ERROR FIELD ON SPEC 105 WILL DISPLAY        ]
 ]    THE SPEC 113 ECP ERROR CODE.  THIS HAPPENS BECAUSE BOTH SPECS    ]
 ]    SHARE THE SAME ECP CODE VARIABLE, AND THE SAME ERROR ROUTINE     ]
 ]    WHICH ENABLES THE ERROR CODE FOR DISPLAY.                        ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 @
