 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] M. MILLER          ]    PASS PROGRAM NOTE        ]        25187     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: JULY 1987  ]
 ] LSIS/282-7167      ]      RELEASE NOTE( )        ] REV B: 07/03/95  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 19 AND SUBS               ]  CREW ( )  GROUND (X)  DUMP ONLY (X)]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC ( )  VU (X)  SM/PL ( )] G9                              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  ACTUATORS, ECP, SSME, OMS                       ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: V4.18, V4.24                                   ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]            F-T-S DUE TO PCMMU DATA                                  ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] COLLISION AVOIDANCE CHECKS, ON THE SSME'S DURING AI AND BODY FLAP   ]
 ] DRIVE TESTS, ARE PERFORMED WITH SSME POSITION DATA READ OUT OF THE  ]
 ] PCMMU. SINCE THIS DATA IS READ BY EACH GPC INDIVIDUALLY, IT IS      ]
 ] POSSIBLE TO OBTAIN DIFFERENT SSME DATA IN THE GPC'S. THEREFORE,     ]
 ] WHEN COLLISION AVOIDANCE LIMIT CHECKS ARE PERFORMED, A F-T-S COULD  ]
 ] OCCUR.                                                              ]
 ]                                                                     ]
 ] NOTE THAT FOR THE DR CONDITION TO EXIST, THE SSME POSITION FEED-    ]
 ] BACKS WOULD HAVE TO BE RIGHT AT THE BOUNDARY OF THE COLLISION       ]
 ] AVOIDANCE ENVELOPE.  THIS IS CONSIDERED TO BE A VERY LOW PROBABIL-  ]
 ] ITY CONDITION.   MOREOVER, THIS PROBLEM HAS NEVER OCCURRED ON ANY   ]
 ] VEHICLE OR IN ANY LAB.                                              ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] TAKE REASONABLE MEASURES TO INSURE THAT WHEN THERE IS A REQUEST TO  ]
 ] DRIVE THE OMS OR BODY FLAP, THE SSME'S ARE WITHIN THE LIMITS SPECI- ]
 ] FIED FOR COLLISION AVOIDANCE CHECKS IN AI AND BODY FLAP DRIVE.      ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS:  HUGH D. STOVALL    DATE 11/09/95]                             ]
 ]     -------------------      ---------]                             ]
 ]ASD:   ERIC C. BINGHAM    DATE 11/09/95]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 11/20/95 ]
 ]PF MGR: ERIC C. BINGHAM   DATE 11/09/95]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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