 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] SMS:  B08297     ]
 ] T.A. MC CLAIN      ]    BFS PROGRAM NOTE         ]                  ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] D/282-440  X3747   ]      RELEASE NOTE ( )       ] 01/24/83         ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] 12.60D AND SUBS               ]  CREW (X)  GROUND ( )  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]           MAJOR SOFTWARE AREA:            ] OPS MODES AFFECTED:     ]
 ]BSL( ) BSS(X) GNC(X) SEQ( ) SM/SP( ) IPL( )] 3                       ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  DISP, SPEC                                      ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: STS83-0020D/4.2.11                             ]
 ]_____________________________________________________________________]
 ] TITLE:   HSD PREDICTORS AT 90 DEGREES + ROLL                        ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]  AFTER THE HSD (HORIZ SIT DISPLAY) PREDICTORS COME UP IN MM304,     ]
 ]  (ALT. <200,000 FT.), AND A ROLL ANGLE (PHI) OF 90 DEGREES IS       ]
 ]  REACHED, THE PREDICTORS WRAP AROUND THE NOSE OF THE SHUTTLE SYMBOL.]
 ]  AS THE ROLL ANGLE GOES BEYOND 90 DEGREES, THE PREDICTORS           ]
 ]  INDICATE A TURN IN THE OPPOSITE DIRECTION OF VEHICLE               ]
 ]  ROLL.  THIS IS DUE TO THE USE OF THE TANGENT OF PHI IN             ]
 ]  THE PREDICTOR POSITION CALCULATIONS.                               ]
 ]  THIS IS NOT SIGNIFICANT AS THE HSD IS NOT THE PRIMARY              ]
 ]  DISPLAY OF CONCERN, AND PREDICTOR POSITIONS ARE NOT                ]
 ]  MEANINGFUL AT THE ALTITUDE AND RANGE AT WHICH SUCH A ROLL          ]
 ]  WOULD BE EXECUTED.                                                 ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]  IGNORE THE POSITION OF THE 20,40,60 SECOND PREDICTORS ON           ]
 ]  THE HSD WHEN THE ROLL ANGLE IS GREATER THAN OR EQUAL TO            ]
 ]  90 DEGREES IN MM304.                                               ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE: C. PURTELL                ]APPROVAL:                    ]
 ]RI:<S>W.P. SELFRIDGE      DATE 09/06/88]                             ]
 ] --------------------         ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 9/14/88 ]                             ]
 ] --------------------         ---------] JACK G BOYKIN       9/20/88 ]
 ]PF MGR: GEORGE BULL, JR.  DATE 9/14/88 ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_____________________________________________________________________]
