 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ]  C. FLETCHER       ]    PASS PROGRAM NOTE        ]     55319        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 3/7/84     ]
 ] IBM/282-7333       ]      RELEASE NOTE( )        ] REV A: 06/21/89  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI7 AND SUBS                 ]  CREW (X)  GROUND ( )  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G2                              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: GUID, ORBIT                                      ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.7                                            ]
 ]_____________________________________________________________________]
 ] TITLE:      INCREASE IN VELOCITY-TO-GO FOR LAMBERT GUIDED MANEUVERS ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] FOR A SMALL LAMBERT MIDCOURSE MANEUVER OF LESS THAN 5 FPS THE       ]
 ] VELOCITY-TO-GO ON THE MANEUVER EXECUTE DISPLAY INCORRECTLY INCREASES]
 ] FROM .4 TO .9 FPS WHEN THE VELOCITY TO GO CORRECTOR TASK IS CYCLED  ]
 ] AT 10 TO 15 SECONDS PRIOR TO IGNITION TIME (TIG). THE EFFECT BECOMES]
 ] LESS AS TIG APPROACHES AND IS CORRECT AT A TIME LESS THAN 4 SECONDS ]
 ] AFTER TIG. THIS IS DUE TO THE INITIATION OF LAMBERT GUIDANCE PRIOR  ]
 ] TO TIG AND IS NEGLIGIBLE FOR MANEUVERS OF LARGER DELTA V'S.         ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] TO AVOID POSSIBLY INEFFICIENT MANEUVERING, DO NOT START THE TRIM OF ]
 ] VELOCITY-TO-GO FOR AXIS-BY-AXIS MANEUVERS UNTIL TIG.                ]
 ]                                                                     ]
 ] OTHERWISE, IGNORE THE OSCILLATION IN VELOCITY-TO-GO FROM GUIDANCE   ]
 ] INITIATE UNTIL TIG.                                                 ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 07/14/89]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 07/28/89]                             ]
 ]    --------------------      ---------] M.C. GREMILLION    08/20/89 ]
 ]PF MGR:MOISES N. MONTEZ   DATE 07/31/89]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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