1+_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ]  A. OGLETREE       ]    PASS PROGRAM NOTE        ]      105644      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  12/01/89  ]
 ]  IBM/282-8440      ]      RELEASE NOTE( )        ] REV A: 05/20/92  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI8C AND SUBS                ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC ( )  VU ( )  SM/PL (X)]    S2, S4                       ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  RMS                                             ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  RMS                                           ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]         EQUIVALENT ATTITUDE DISPLAYED                               ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]      WHEN OPERATING THE RMS SOFTWARE, IF A DESIRED ATTITUDE         ]
 ]   SPECIFIES A YAW OF 90 OR 270 DEGREES, THE DISPLAYED PITCH AND     ]
 ]   ROLL MAY NOT MATCH THE SPECIFIED PITCH AND ROLL.                  ]
 ]                                                                     ]
 ]      THE DISPLAYED ATTITUDE IS EQUIVALENT TO THE DESIRED ATTITUDE.  ]
 ]   (SEE USER RESPONSE BELOW)                                         ]
 ]                                                                     ]
 ]      THIS OCCURS DUE TO A MATHEMATICAL SINGULARITY SUCH THAT THE    ]
 ]   PITCH AND ROLL VALUES ARE NOT INDEPENDENT.                        ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]     THE DISPLAYED ATTITUDE IS EQUIVALENT IF ONE OF THE FOLLOWING    ]
 ]   IS TRUE:                                                          ]
 ]                                                                     ]
 ]   YAW=90  :: (DESIRED) PITCH + ROLL = (DISPLAYED) PITCH + ROLL      ]
 ]                                                                     ]
 ]   YAW=270 :: (DESIRED) PITCH - ROLL = (DISPLAYED) PITCH - ROLL      ]
 ]                                                                     ]
 ]   NOTE THAT THESE SHOULD BE EQUAL WHEN THEY ARE MOD 360.            ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: PATTI A. THORNTON    DATE 06/30/92]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 07/09/92]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 07/17/92 ]
 ]PF MGR:  PALMER CHIU      DATE 07/13/92]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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