 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] J. BRADBURY        ]    PASS PROGRAM NOTE        ]      105441      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  06/14/89  ]
 ] IBM/282-7368       ]      RELEASE NOTE( )        ] REV B: 03/04/91  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI20 AND SUBS                 ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G6                              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:   GUID, ABORT                                    ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  4.4                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]        DELAYED GUIDANCE CONVERGENCE FOLLOWING RTLS SELECTION        ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] IF AN SSME FAILS EARLY IN FIRST STAGE AND RTLS ABORT IS SELECTED    ]
 ] EARLY IN THE RTLS ABORT WINDOW, POWERED RTLS GUIDANCE MAY ENCOUNTER ]
 ] A SINGULARITY DURING ITS INITIALIZATION PHASE (IMMEDIATELY AFTER    ]
 ] RTLS SELECTION) THAT COULD DELAY CONVERGENCE OF GUIDANCE BY UP TO   ]
 ] 30 SECONDS.  THE GUIDANCE STATUS PARAMETER ON THE RTLS TRAJ DISPLAY ]
 ] WILL CHANGE FROM "GUID INIT" TO "GUID INHB" OR "GUID XXX" (WHERE    ]
 ] XXX IS A NON-NEGATIVE INTEGER), WHEN GUIDANCE INITIALIZATION IS     ]
 ] COMPLETE.  THIS CAN HAPPEN IN THE PASS AND BFS AS MUCH AS 30        ]
 ] SECONDS APART IF THIS PROBLEM OCCURS.                               ]
 ]                                                                     ]
 ] ALSO, DOWNLIST OF THE PEG CONVERGENCE DISCRETE (MSID V90X1971X)     ]
 ] FROM PASS AND BFS WILL SHOW CONVERGENCE OCCURRING IN THE PASS AND   ]
 ] BFS AS MUCH AS 30 SECONDS APART IF THIS PROBLEM OCCURS.             ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] BE AWARE THAT PASS AND BFS GUIDANCE MAY CONVERGE AS MUCH AS 30      ]
 ] SECONDS APART.                                                      ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM:  PATTI A. THORNTON   DATE 04/26/91]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 05/03/91]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 05/08/91 ]
 ]PF MGR: KAREN D. FRANK    DATE 05/06/91]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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