 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ]  C. FLETCHER       ]    PASS PROGRAM NOTE        ]     58374        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  05/14/84  ]
 ]  IBM/282-7333      ]      RELEASE NOTE( )        ] REV B: 06/19/90  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]   STS-14 AND SUBS             ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )]          G2, G8                 ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: GUID                                             ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  4.213                                         ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]          OPS TRANSITION WITH TARGET TRACK ACTIVE                    ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]      WHEN AN OPS MODE RECALL (WITH TARGET SET CHANGE AND G2 OVERLAY ]
 ] FROM MASS MEMORY) OR OPS 2 TO 8 TRANSITION IS EXECUTED WITH RENDEZ- ]
 ] VOUS NAV ENABLED, RENDEZVOUS NAV WILL BE DISABLED AFTERWARDS AND    ]
 ] WILL NOT BE COMPUTING THE TARGET STATE VECTOR.  IF THE UNIVERSAL    ]
 ] POINTING TARGET TRACK OPTION (ITEM 8+1 ON THE UNIV PTG DISPALY WHICH]
 ] IS A TRACK OF AN ORBIT TARGET) WAS ACTIVE AT THE TIME OF THE OPS    ]
 ] MODE RECALL OR OPS TRANSITION, UNIVERSAL POINTING WILL CONTINUE TO  ]
 ] TRACK AN INCORRECT TARGET STATE.  THIS MAY CAUSE UNDESIRABLE RCS    ]
 ] ACTIVITY.  AFTER AN OPS MODE RECALL UNIVERSAL POINTING WILL CONTINUE]
 ] TO TRACK THE LAST COMPUTED RELATIVE STATE.  AFTER AN OPS 2 TO 8     ]
 ] TRANSITION THE RELATIVE STATE IS LOST AND MULTIPLE GPC ERRORS       ]
 ] (PDE=GEKORB) (GP 4 CODE 1C) WILL RESULT FROM OPERATIONS (UNIT       ]
 ] FUNCTION) ON ZERO VECTORS.  IN BOTH CASES RADAR TRACKING, IF ACTIVE,]
 ] WILL BE LOST DUE TO BAD LINE-OF-SIGHT VECTORS BEING SENT TO SM.     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]    THIS SITUATION CAN BE PREVENTED BY CANCELLING                    ]
 ] THE TARGET TRACKING (ITEM 21 ON THE UNIV PTG DISPLAY) BEFORE        ]
 ] EXECUTING THE OPS MODE RECALL OR TRANSITION.  THE JET FIRINGS CAN   ]
 ] BE STOPPED BY MODING THE DAP TO MANUAL.  THE GPC ERRORS CAN BE      ]
 ] STOPPED BY A PRO TO MM201 FOLLOWED BY CANCELLING THE TARGET         ]
 ] TRACKING.                                                           ]
 ]                                                                     ]
 ] IF THIS SITUATION OCCURS, A TARGET STATE UPLINK IS REQUIRED TO      ]
 ] RESUME TRACKING ONCE BACK IN MM 201.                                ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: PATTI A. THORNTON    DATE 07/25/90]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   SAM ANKNEY        DATE 07/30/90]                             ]
 ]     -------------------      ---------] S. N. HARDEE, JR.  08/07/90 ]
 ]PF MGR:MOISES N. MONTEZ   DATE 08/06/90]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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