 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] T. TALBERT         ]    PASS PROGRAM NOTE        ]    37593         ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] ENG/282-8453       ]      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 ( )] G2, G3                          ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  IMU, SPEC                                       ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.7, 4.209                                     ]
 ]_____________________________________________________________________]
 ] TITLE:  WEIGHT DECREMENTS ON MNVR EXEC DISP IN MM302 OR 202 WHEN NO ]
 ]           THRUST IS APPLIED                                         ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] THE VEHICLE WEIGHT DECREMENTS ON THE MNVR EXEC DISP DURING A GUIDED ]
 ] BURN PER REQUIREMENTS.  VERSION 18 FLIGHT SOFTWARE HAS DISCOVERED   ]
 ] THAT THE WEIGHT DECREMENTS AFTER BURNOUT IN MM302 OR 202 AT 0.5     ]
 ] LB/SEC WHEN NO THRUST IS BEING APPLIED.  THIS IS CAUSED BY IMU      ]
 ] QUANTIZATION RESULTING IN A NON-ZERO SENSED DELTA V BEING INPUT TO  ]
 ] GUIDANCE WHICH CALCULATES THE VEHICLE MASS AS A FUNCTION OF SENSED  ]
 ] DELTA V.  THE ERRONEOUS WEIGHT DECREMENTING WILL STOP UPON TRANSI-  ]
 ] TION TO MM303 (OR 201) OR A KEYBOARD ENTRY THAT CAUSES THE LOAD TO  ]
 ] FLASH THUS DESCHEDULING THE GUIDANCE INPUT TASK.                    ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] BE AWARE OF THE CAUSE FOR THIS SITUATION.                           ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 07/28/88]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 08/02/88]                             ]
 ]    --------------------      ---------] JACK G BOYKIN      08/17/88 ]
 ]PF MGR: DALLAS IVES       DATE 07/29/88]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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