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 ] AUTHOR:            ]                             ] DR:              ]
 ] ROD DOBSON         ]    PASS PROGRAM NOTE        ]      63979       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  01/19/87  ]
 ] IBM/282-7330       ]      RELEASE NOTE( )        ] REV B: 04/22/92  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI8A AND SUBS                 ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )]  G1, G2, G3                     ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  OMS, ANNUNCIATION                               ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.92                                           ]
 ]_____________________________________________________________________]
 ] TITLE:  FALSE FAILURE ANNUNCIATION OF OMS ACTUATORS                 ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ]     A FALSE OMS TVC RM ANNUNCIATION MAY OCCUR ANYTIME A LARGE       ]
 ]  COMMAND/POSITION DELTA EXISTS AND THE ACTUATOR DRIVE RATE HAS      ]
 ]  DEGRADED TO NEAR THE 2.9 DEG/SEC MINIMUM (FLIGHT RULE 8-32).       ]
 ]  THIS IS BECAUSE THE ACTUATOR POSITION MAY NOT BE WITHIN 2 DEGREES  ]
 ]  OF ITS COMMANDED POSITION BEFORE THE RM FAILURE LIMIT COUNTER (24) ]
 ]  IS EXCEEDED.  THIS RESULTS IN A MISLEADING DOWN ARROW ON THE MNVR  ]
 ]  EXEC DISPLAY.  THE PROBABILITY OF THIS ANNUNCIATION OCCURRING      ]
 ]  DECREASES AS THE OMS ACTUATOR DRIVE RATE INCREASES.                ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]  UPON ANNUNCIATION OF AN OMS ACTUATOR FAILURE, CREW PROCEDURE       ]
 ] IS TO SELECT THE SECONDARY GIMBAL SYSTEM AND CONTINUE WITH THE      ]
 ] BURN.  THIS PROCEDURE IS DOCUMENTED ON THE OMS BURN MONITOR         ]
 ] CUE CARD.                                                           ]
 ]  THE GROUND SHOULD VERIFY WHETHER THE PRIMARY ACTUATOR ACTUALLY     ]
 ] FAILED OR THE ANNUNCIATION WAS FALSE DUE TO THE ABOVE DESCRIBED     ]
 ] CONDITION.                                                          ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: PATTI A. THORNTON    DATE 06/09/92]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 06/10/92]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 06/19/92 ]
 ]PF MGR:  R. W. LOFFI      DATE 06/17/92]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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