 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] R. MCALLISTER      ]    PASS PROGRAM NOTE        ]    37538         ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] ENG/282-8428       ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI02 AND SUBS                 ]  CREW (X)  GROUND ( )  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G1                              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: ADI                                              ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.168                                          ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]          PRE-LAUNCH ADI REFERENCE                                   ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] AT TIME OF LAUNCH, THE VEHICLE IS IN AN ATTITUDE SUCH THAT THE LVLH ]
 ] ADI REFERENCE IS INVALID (I.E., NEAR 90 DEGREE PITCH).  IF THE CREW ]
 ] SELECTS THE LVLH REFERENCE, THEN THE ADI WILL INDICATE 90 DEGREE    ]
 ] PITCH, ZERO YAW, AND AN INVALID ROLL ANGLE.  THE ADI ROLL GIMBAL    ]
 ] RETAINS THE VALUE EITHER I-LOADED (IF LVLH IS SELECTED WHEN ENTERING]
 ] OPS 1) OR THE LAST VALUE COMPUTED IN THE REFERENCE OR INERTIAL      ]
 ] POSITION.                                                           ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] INITIALIZE ADI SELECT SWITCHES TO THE REFERENCE OR INERTIAL         ]
 ] POSITIONS AND AVOID USING THE LVLH POSITION UNTIL 15 SECONDS AFTER  ]
 ] LAUNCH.                                                             ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 07/28/88]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 08/02/88]                             ]
 ]    --------------------      ---------] JACK G BOYKIN      08/17/88 ]
 ]PF MGR: ARTHUR HIEMER     DATE 07/29/88]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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