 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] S.K. ROOS          ]    PASS PROGRAM NOTE        ]     105527       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 02/20/90   ]
 ] IBM/282-7639       ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI8B AND SUBS                ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G3                              ]
 ]___________________________________]_________________________________]
 ] SOFTWARE SUB-AREA: GUID, DISP, ADI                                  ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.211, 4.209                                   ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]        DEORBIT GUIDANCE ANOMALIES FOR FUEL WASTING BURNS            ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]  FOR DEORBIT BURNS REQUIRING ONLY A SMALL AMOUNT OF OUT-OF-PLANE    ]
 ]  FUEL WASTING, THE DESIRED THRUST DIRECTION (LAMC) COMPUTED DURING  ]
 ]  THE LOAD SOLUTION MAY BE BASED ON AN UNCONVERGED GUIDANCE          ]
 ]  SOLUTION.  THE TRANS DAP USES THIS THRUST DIRECTION TO DETERMINE   ]
 ]  THE DESIRED PRE-BURN ATTITUDE.  LAMC ALSO DRIVES THE ADI ATTITUDE  ]
 ]  ERRORS.  THE VELOCITY-TO-BE-GAINED VECTOR, VGO, THAT IS SENT TO    ]
 ]  THE DEORB MNVR DIP, HOWEVER, IS BASED ON THE FINAL CONVERGED       ]
 ]  SOLUTION.  THE NET EFFECTS OF THIS REQUIREMENTS DEFICIENCY ARE     ]
 ]  THAT THE Y-BODY COMPONENT (YAW) OF VGO ON THE DEORB MNVR DIP WILL  ]
 ]  BE EXCESSIVE AND ERRATIC BETWEEN TIG-15 SEC AND TIG, AND THE ADI   ]
 ]  YAW ATTITUDE ERROR NEEDLE MAY PEG AT IGNITION.                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]  THE GROUND FLIGHT SUPPORT WILL, AS PART OF DEORBIT PLANNING,       ]
 ]  NOTIFY THE CREW OF THE EXPECTED VGO Y-BODY FLUCTUATIONS THAT WILL  ]
 ]  BE SEEN ON THE DEORB MNVR DIP BETWEEN TIG-15 SEC AND TIG.  THE     ]
 ]  GROUND WILL ALSO ADVISE THE CREW OF THE APPROXIMATE MAGNITUDE AND  ]
 ]  DURATION (APPROXIMATELY 20 SECS) OF THE EXPECTED ADI YAW NEEDLE    ]
 ]  DEFLECTION AT TIG AS WELL AS ANY REQUIRED ACTION ON THE PART OF    ]
 ]  THE CREW.  THE CREW MAY CONSIDER AN APPROPRIATE ADI SENSITIVITY    ]
 ]  SELECTION BASED UPON THE EXPECTED ADI YAW ERROR.                   ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM:   WYATT COOPER       DATE 03/29/90]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD:    SAM ANKNEY        DATE 03/29/90]                             ]
 ]    --------------------      ---------] S. N. HARDEE, JR.  04/03/90 ]
 ]PF MGR:  M. N. MONTEZ     DATE 03/30/90]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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