 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ]  E. GOMEZ          ]    PASS PROGRAM NOTE        ]     57288        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 5/16/84    ]
 ]  IBM/282-8743      ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] 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: ORBIT, DAP, RCS                                  ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.35                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]      RCS JET FIRINGS AFTER OMS CUTOFF IN OPS 2                      ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]      AT THE END OF AN OMS BURN IN OPS G2, THE ORBIT DAP SHOULD      ]
 ] SWITCH FROM TVC TO RCS MODE AND PERFORM AN ATTITUDE HOLD ABOUT      ]
 ] THE CURRENT ATTITUDE.  THESE EVENTS DO OCCUR, BUT THERE IS A .32    ]
 ] TO .88 SECOND DELAY BETWEEN THE TVC TO RCS TRANSITION AND THE       ]
 ] "SNAPPING" OF THE CURRENT ATTITUDE.  DURING THIS PERIOD, THE DAP    ]
 ] WILL ATTEMPT TO PERFORM AN ATTITUDE HOLD ABOUT THE GUIDANCE         ]
 ] COMMANDED BURN ATTITUDE USING THE RCS ATTITUDE DEADBANDS.  THE      ]
 ] RCS DEADBANDS ARE CREW SELECTABLE AND NOMINALLY 3 DEGREES.  THIS    ]
 ] IS CONSIDERABLY SMALLER THAN THE OMS TVC DEADBANDS WHICH ARE 10     ]
 ] DEGREES.  IF THE ATTITUDE ERRORS FROM THE GUIDANCE COMMANDED BURN   ]
 ] ATTITUDE EXCEED THE RCS DEADBANDS AT THE END OF THE OMS BURN,       ]
 ] UNEXPECTED RCS ACTIVITY WILL OCCUR.                                 ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]     BE AWARE THAT IF ATTITUDE ERRORS GREATER THAN THE RCS DEADBANDS ]
 ] EXIST AT OMS CUTOFF, SOME RCS ACTIVITY WILL OCCUR.                  ]
 ]     THE PROBABILITY OF THIS RCS ACTIVITY OCCURRING CAN BE REDUCED   ]
 ] OR ELIMINATED BY INCREASING THE RCS DEADBANDS.  IT CAN ALSO BE      ]
 ] AVOIDED BY SELECTING MANUAL BEFORE THE END OF THE OMS BURN.         ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 7/28/88 ]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 7/28/88 ]                             ]
 ]    --------------------      ---------] RW MOOREHEAD        7/30/88 ]
 ]PF MGR: KL LINDSAY        DATE 7/29/88 ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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