 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ]  CRAWFORD FLETCHER ]    PASS PROGRAM NOTE        ]     104850       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  04/16/91  ]
 ]  IBM/282-7333      ]      RELEASE NOTE( )        ] REV A: 04/22/91  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI20 AND SUBS                ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )]     G3                          ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:   NAV, DISP                                      ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  4.124, 6.21                                   ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] BAD TACAN ID ON SPEC 50 WHEN TACAN UPLINK PERFORMED IN MM303        ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]  UPON ENTERING OPS 3, THE DEFAULT AREA AND RUNWAY ON SPEC 50 ARE    ]
 ]  1 AND PRI, RESPECTIVELY.  THE SELECTED TACAN IS THE FIRST ONE IN   ]
 ]  THE TACAN TABLE FOR THE DEFAULT AREA.  THE INITIALIZATION AT MM301 ]
 ]  USES THE TACAN_ID TO GENERATE A CHANNEL/MODE IDENTIFIER.  THIS     ]
 ]  IDENTIFIER IS USED BY THE TACAN SOP TO ACQUIRE THE TACAN STATION TO]
 ]  OBTAIN DATA FOR NAVIGATION AND DISPLAY PURPOSES.  THE TACAN_ID     ]
 ]  ASSOCIATED WITH THE CHANNEL/MODE IDENTIFIER IS DISPLAYED ON THE HSD]
 ]  OPPOSITE ITEM 5.  SHOULD AN UPLINK OF TACAN DATA INTO THE SELECTED ]
 ]  TACAN STATION OCCUR PRIOR TO MM304, AND NO TOGGLE (OR DOUBLE       ]
 ]  TOGGLE) OF ITEM 5 OCCURS ON THE HSD, THE INITIALIZATION AT MM304   ]
 ]  WILL PRODUCE A SITUATION WHEREBY THE TACAN SOP WILL BE ATTEMPTING  ]
 ]  TO LOCKON TO THE TACAN STATION THAT WAS IN THE TACAN TABLE PRIOR   ]
 ]  TO THE UPLINK AND THE NAVIGATION SOFTWARE WILL GENERATE A POSITION ]
 ]  VECTOR USING THE DATA THAT WAS UPLINKED TO THE FIRST SLOT OF THE   ]
 ]  TACAN TABLE.  THE TACAN_ID FOR THIS TACAN WILL BE DISPLAYED IN THE ]
 ]  LOWER RIGHT PORTION OF THE HSD WITH THE ABSOLUTE AND DELTA TACAN   ]
 ]  DATA.                                                              ]
 ]  THIS WILL PRODUCE THE FOLLOWING ANOMALIES UNLESS THE UPLINKED DATA ]
 ]  IS IDENTICAL TO THE DATA IN THE FIRST SLOT OF THE TACAN TABLE:     ]
 ]   1) THE SELECTED TACAN ID, DISPLAYED NEXT TO ITEM 5 ON THE HSD,    ]
 ]      WILL REFLECT THE PREVIOUS (NON_UPLINKED) VALUE.                ]
 ]   2) TACAN RANGE AND BEARING DELTAS, DISPLAYED UNDER ITEMS 33-35    ]
 ]      AND IN THE RESIDUAL COLUMN ON THE HSD, COULD BE UNUSUALLY      ]
 ]      LARGE, AND WILL REMAIN SO UNTIL THE CONDITIONS IN ERROR ARE    ]
 ]      RECTIFIED.                                                     ]
 ]                                                                     ]
 ]               - CONTINUED ON SUPPLEMENTAL PAGE -                    ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM:  CHARLES HALLIMAN    DATE 07/02/91]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:  ROBERT N. HINSON   DATE 07/03/91]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 07/10/91 ]
 ]PF MGR: M. N. MONTEZ      DATE 07/08/91]------------------- -------- ]
 ]        GEORGE BULL, JR.       07/08/91] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] DR:              ]
 ]  CRAWFORD FLETCHER ]    PASS PROGRAM NOTE        ]     104850       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  04/16/91  ]
 ]  IBM/282-7333      ]      RELEASE NOTE ( )       ] REV A: 04/22/91  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ]  BAD TACAN ID ON SPEC 50 WHEN TACAN UPLINK PERFORMED IN MM303       ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]  THERE ARE THREE POSSIBLE RESPONSES TO ACHIEVE CORRECT RESULTS.     ]
 ]   1)  IF DATA IS UPLINKED INTO THE TACAN SLOT BEING USED AND IS     ]
 ]     IDENTICAL TO THE DATA BEING USED, NO GROUND OR CREW RESPONSE    ]
 ]     IS REQUIRED.                                                    ]
 ]                                                                     ]
 ]   2)  IF DATA IS UPLINKED INTO THE TACAN SLOT BEING USED AND IS NOT ]
 ]     IDENTICAL, THE USER MAY A) EXECUTE ITEM 5 TO SELECT THE SEC     ]
 ]     TACAN OR B) EXECUTE ITEM 5 TWICE TO SELECT THE SEC TACAN AND    ]
 ]     RESELECT THE PRI TACAN.                                         ]
 ]                                                                     ]
 ]   3)  IF DATA IS UPLINKED INTO THE SEC TACAN SLOT AND IT IS NOT     ]
 ]     CURRENTLY SELECTED, NO GROUND OR CREW RESPONSE IS REQUIRED.     ]
 ]                                                                     ]
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 ]                                                                     ]
 ]_____________________________________________________________________]
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