 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] J. ZOPHY           ]    PASS PROGRAM NOTE        ]     15194        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: JULY 1987  ]
 ] ENG/282-8409       ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI02 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: DAP, SPEC                                        ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.35, 6.27                                     ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] DISPLAYED DAP ATTITUDE ERRORS DISCONTINUITIES ON-ORBIT              ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] UNDER SPECIAL CIRCUMSTANCES, LARGE DAP ATTITUDE ERROR JUMPS MAY BE  ]
 ] OBSERVED ON THE UNIVERSAL POINTING DISPLAY IN MM 201 WHILE THE DAP  ]
 ] IS IN THE AUTO MODE.                                                ]
 ]                                                                     ]
 ] THIS PROBLEM CAN OCCUR ONLY FOR THE FOLLOWING SCENARIO:             ]
 ]  PRIMARY RCS JETS ARE SELECTED AND A SIGNIFICANT (>1.5 DEG/SEC)     ]
 ]  ROTATIONAL RATE IS INDUCED ON THE VEHICLE, AND THEN RCS VERNIER    ]
 ]  JETS ARE SELECTED (WHILE THE DAP IS STILL IN THE AUTO MODE).       ]
 ]                                                                     ]
 ] THESE DAP ATTITUDE ERROR JUMPS ARE DUE TO THE CHANGE IN MAGNITUDE   ]
 ] OF THE ROTATIONAL ACCELERATION ASSOCIATED WITH THIS MODING CHANGE   ]
 ] AND WILL BE OBSERVED ONBOARD WHENEVER THE DAP ERRORS ARE SELECTED   ]
 ] (ITEM 24 ON UNIVERSAL POINTING DISPLAY OR ADI ERROR NEEDLES).       ]
 ] THEY CAN ALSO BE SEEN IN THE DOWNLISTED DAP ERRORS.                 ]
 ]                                                                     ]
 ] IT SHOULD BE REALIZED THAT THERE IS NO DAP PERFORMANCE EFFECT       ]
 ] (FSW PERFORMS PER REQUIREMENTS) AND THAT THIS IS A "DISPLAYED       ]
 ] DATA" PECULIARITY ONLY.                                             ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] DO NOT BE CONFUSED BY TEMPORARY TRANSIENTS IN DISPLAYED DAP         ]
 ] ATTITUDE ERRORS ON THE UNIVERSAL POINTING DISPLAY IF ASSOCIATED     ]
 ] WITH THIS SCENARIO AND DISREGARD THESE VALUES UNTIL THE DESIRED     ]
 ] ATTITUDE OR ROTATIONAL RATE IS ACHIEVED BY THE (AUTO) DAP.          ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 7/28/88 ]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 7/28/88 ]                             ]
 ]    --------------------      ---------] RW MOOREHEAD        7/30/88 ]
 ]PF MGR: KL LINDSAY        DATE 7/29/88 ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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