 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] H. STOVALL         ]    PASS PROGRAM NOTE        ]    37559         ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: AUG. 1987  ]
 ] ENG/282-7369       ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 19 AND SUBS               ]  CREW (X)  GROUND ( )  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G3                              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: ADI                                              ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.209, 4.103                                   ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] ADI YAW ERROR NEEDLE SENSITIVITY FOR FUEL WASTING                   ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] THE ADI YAW ERROR NEEDLE IS SENSITIVE DURING FUEL WASTING MANEUVERS ]
 ] (OPS 3). THIS SENSITIVITY IS USUALLY MOST NOTICEABLE NEAR CUTOFF    ]
 ] SHORTLY BEFORE THE PEG THRUST POINTING COMMANDS ARE FROZEN (TGO =   ]
 ] 6 SECONDS). TYPICALLY THE YAW NEEDLE WILL DIVERGE SUDDENLY OR       ]
 ] APPEAR TO JUMP NEAR A TGO OF 6 SECONDS. THIS BEHAVIOR RESULTS       ]
 ] BECAUSE THE GUIDANCE (PEG) VARIES VELOCITY-TO-BE-GAINED OUT OF      ]
 ] PLANE (VGOY) TO ACHIEVE A MASS TARGET. PEG PREDICTION ERRORS (SUCH  ]
 ] AS MASS ERRORS) LEAD TO A RATE OF CHANGE OF VGOY (TO ACHIEVE        ]
 ] CONSTRAINT) WHICH IS NOT PROPORTIONAL TO THE RATE OF CHANGE OF      ]
 ] THE IN-PLANE VGO. THIS CAUSE AN OUT-OF-PLANE ROTATION OF THE        ]
 ] THRUST POINTING COMMAND AND CONSEQUENTLY THE ERROR NEEDLE           ]
 ] MOVEMENT.                                                           ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] IGNORE YAW ERROR NEEDLE DIVERGENCIES OR JUMPS NEAR CUTOFF FOR FUEL  ]
 ] WASTING MANEUVERS.                                                  ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 07/28/88]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE         ]                             ]
 ]    --------------------      ---------] JACK G BOYKIN      08/17/88 ]
 ]PF MGR: DALLAS IVES       DATE 07/29/88]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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