 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] B. MCALLISTER      ]    PASS PROGRAM NOTE        ]     37981        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] ENG/282-8428       ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 19 AND SUBS               ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G1, G6, G3                      ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  NAV, UPLINK                                     ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.15, 4.144, 4.205, 4.127                      ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] STATE VECTOR UPDATE DURING ENTRY                                    ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] ATTEMPTING A WHOLE VECTOR STATE UPDATE DURING PERIODS WHEN THERE    ]
 ] ARE APPRECIABLE ACCELERATIONS BEING EXPERIENCED BY THE VEHICLE,     ]
 ] SUCH AS ATMOSPHERIC FLIGHT BELOW 400K FT OR DURING POWERED FLIGHT,  ]
 ] WILL RESULT IN DEGRADED NAVIGATION WHICH COULD CAUSE SUBSEQUENT     ]
 ] LOSS OF CONTROL.                                                    ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] DO NOT PERFORM WHOLE VECTOR STATE UPDATES DURING POWERED FLIGHT OR  ]
 ] DURING ATMOSPHERIC FLIGHT BELOW 400K FT. A DELTA STATE UPDATE IS    ]
 ] NOT SUBJECT TO THIS RESTRICTION, AND IS THEREFORE THE RECOMMENDED   ]
 ] ALTERNATIVE TO BE USED DURING ATMOSPHERIC FLIGHT.                   ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 7/28/88 ]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 7/28/88 ]                             ]
 ]    --------------------      ---------] RW MOOREHEAD        7/30/88 ]
 ]PF MGR: MOISES MONTEZ     DATE 7/29/88 ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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