 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] J. ZOPHY           ]    PASS PROGRAM NOTE        ]      37561       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] ENG/282-8409       ]      RELEASE NOTE( )        ] REV A: 06/06/89  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 18 AND SUBS               ]  CREW (X)  GROUND ( )  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G1, G2, G3                      ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  OMS, GUID                                       ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.35, 4.201, 4.64, 6.35                        ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] OMS GIMBAL DRIVE CHECK DURING OMS MANEUVERS                         ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] A GIMBAL DRIVE CHECK (AN ITEM 34 EXEC ON THE MNVR EXEC DISPLAY) CAN ]
 ] BE EXECUTED DURING AN OMS BURN. A GIMBAL DRIVE CHECK PERFORMED      ]
 ] DURING THE MANEUVER MAY NOT CAUSE AN UNRECOVERABLE SITUATION,       ]
 ] HOWEVER, AT A MINIMUM, A CROSS AXIS VELOCITY ERROR WILL BE          ]
 ] INTRODUCED WHICH MUST BE REMOVED BY THE AUTO SYSTEM. SUCH A         ]
 ] PERTURBATION WOULD BE MORE SIGNIFICANT TOWARD THE END OF THE        ]
 ] MANEUVER (BECAUSE OF A SMALL REMAINING VGO).                        ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] DO NOT INITIATE GIMBAL DRIVE CHECK DURING OMS BURNS. IF A GIMBAL    ]
 ] DRIVE CHECK IS INADVERTENTLY PERFORMED, THE AUTO GUIDANCE SYSTEM    ]
 ] WILL ATTEMPT TO REMOVE THE INDUCED VELOCITY ERROR (PROPELLANT       ]
 ] PERMITTING).                                                        ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 06/29/89]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 07/14/89]                             ]
 ]    --------------------      ---------] W.C. GREMILLION    08/20/89 ]
 ]PF MGR: GEORGE W. BULL JR DATE 07/28/89]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]       K.L. LINDSAY           08/04/89 ]                             ]
 ]       E.T. KUBIAK            08/04/89 ]                             ]
 ]       J.A. VERNON            08/04/89 ]                             ]
 ]_______________________________________]_____________________________]
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 DR37562
