1+_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] R. L. DOBSON       ]    PASS PROGRAM NOTE        ]       38765*     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] IBM/713-282-7330   ]      RELEASE NOTE( )        ] REV G: 06/23/93  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-22 AND SUBS                ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )] G1, G9                          ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: SEQ, ASCENT, DAP, ACTUATORS                      ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.187, 4.188, 4.176, 4.114                     ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] RS LAUNCH SEQUENCER AND TERMINAL COUNT PROCESSING                   ]
 ]_____________________________________________________________________]
 ] DESCRIPTION: * DR39740 AND DR37537                                  ]
 ]                                                                     ]
 ] A. RESTRICTIONS ON SLEW CHECK INITIATION (REFERENCE DR38765).       ]
 ]                                                                     ]
 ] DESCRIPTION - THE FOLLOWING RESTRICTIONS ON INITIATION OF THE SLEW  ]
 ] CHECKS MUST BE OBSERVED BY THE LPS SINCE THERE IS NO PROTECTIVE     ]
 ] CODE IN THE FLIGHT SOFTWARE.                                        ]
 ]                                                                     ]
 ] 1. THE SRB SLEW CHECK MUST BE COMPLETE NO LATER THAN THE CYCLE ON   ]
 ]    WHICH THE SRB IGNITION COMMAND IS ISSUED. FAILURE TO COMPLY CAN  ]
 ]    RESULT IN IGNITION WITH THE ACTUATORS IN NON-ZERO POSITIONS, IN  ]
 ]    SLEW CHECK GIMBALING OF THE SRB NOZZLES FOR UP TO .32 SECONDS    ]
 ]    BEYOND SRB IGNITION, AND IN LARGE STEPS IN THE ELEVON COMMANDS   ]
 ]    DURING FIRST STAGE FLIGHT (9 DEGREES AND 10 DEGREES FOR INBOARD  ]
 ]    AND OUTBOARD ELEVONS) WHICH CAN CAUSE HYDRAULIC SYSTEM DAMAGE.   ]
 ]                                                                     ]
 ] 2. THE MPS SLEW CHECK MUST BE COMPLETE NO LATER THAN THE CYCLE ON   ]
 ]    WHICH THE FIRST SSME START COMMAND IS ISSUED. FAILURE TO COMPLY  ]
 ]    CAN RESULT IN SSME IGNITION WITH ACTUATORS IN NON-ZERO           ]
 ]    POSITIONS, IN SLEW CHECK GIMBALING OF THE SSME NOZZLES FOR UP    ]
 ]    TO .32 SECONDS BEYOND SRB IGNITION, AND IN LARGE STEPS IN THE    ]
 ]    ELEVON COMMANDS DURING FIRST STAGE FLIGHT (9 DEGREES AND 10      ]
 ]    DEGREES FOR INBOARD AND OUTBOARD ELEVONS) WHICH CAN CAUSE        ]
 ]    HYDRAULIC SYSTEM DAMAGE.                                         ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM:   JEAN L. ZOPHY      DATE 08/03/93]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 08/03/93]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 08/23/93 ]
 ]PF MGR: KIRK A. SHIREMAN  DATE 08/10/93]------------------- -------- ]
 ]        KENNY TODD             08/10/93] CHAIRMAN, SASCB      DATE   ]
 ]        VINCENT M. LEVY        08/16/93]                             ]
 ]_______________________________________]_____________________________]
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1+_____________________________________________________________________
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] DR:              ]
 ] R. L. DOBSON       ]    PASS PROGRAM NOTE        ]       38765      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] IBM/713-282-7330   ]      RELEASE NOTE ( )       ] REV G: 06/23/93  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ] RS LAUNCH SEQUENCER AND TERMINAL COUNT PROCESSING                   ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] 3. THE AEROSURFACE SLEW CHECK MUST BE COMPLETED NO LATER THAN THE   ]
 ]    CYCLE ON WHICH THE RS AUTO SEQUENCE START EVENT OCCURS (T-28     ]
 ]    SECONDS AND LPS GO FOR AUTO SEQUENCE START). FAILURE TO COMPLY   ]
 ]    CAN RESULT IN A LARGE STEP IN THE SPEEDBRAKE COMMAND (APPROX.    ]
 ]    15 DEGREES) AT THE START OF SPEEDBRAKE CLOSURE IF CLOSURE IS     ]
 ]    STARTED DURING AN AERO SLEW, OR AT THE START OF THE AERO SLEW IF ]
 ]    THE SLEW IS STARTED AFTER CLOSURE IS INDICATED. ALSO, THE        ]
 ]    SPEEDBRAKE WILL BE AT 5 DEGREES, NOT -9.9 DEGREES, FOR FLIGHT.   ]
 ]    FINALLY, NON-COMPLIANCE CAN RESULT IN AERO SLEW CHECK GIMBALING  ]
 ]    DURING FLIGHT, EVEN WHEN ELEVON LOAD RELIEF IS DONE STARTING AT  ]
 ]    L+2.5 SECONDS. IN THIS CASE, ELEVON LOAD RELIEF WILL BE          ]
 ]    INHIBITED UNTIL THE SLEW CHECK COMPLETES.                        ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] USER RESPONSE - THERE IS NO WORKAROUND FOR THE ABOVE RESTRICTIONS.  ]
 ] AN LPS HOLD COMMAND MUST BE SENT TO ABORT THE LAUNCH OR THE         ]
 ] INDICATED ADVERSE CONSEQUENCES MUST BE ACCEPTED.                    ]
 ]                                                                     ]
 ]                                                                     ]
 ] B. OPS 1 LPS BYPASS MUST BE RE-ENTERED.  REFERENCE DR 37537         ]
 ]                                                                     ]
 ] DESCRIPTION - IF ANY OPS 1 LPS BYPASS OF LO2 ACCUM RECIRC VLV       ]
 ] OPEN OR LO2 OVERBOARD BLEED VALVE CLOSE IS ENTERED PRIOR TO A       ]
 ] RECYCLE AND A COUNT RECYCLE OCCURS, THE RS LAUNCH SEQUENCER         ]
 ] CLEARS THE BYPASS INDICATION.                                       ]
 ]                                                                     ]
 ] USER RESPONSE - RE-ENTER THE DESIRED BYPASS PRIOR TO RESUMING THE   ]
 ] COUNT.                                                              ]
 ]                                                                     ]
 ] C. MPS VALVE CONFIGURATION AFTER SECOND OPS 1 PRO (REFERENCE DR     ]
 ]    39740).                                                          ]
 ]                                                                     ]
 ] DESCRIPTION - WITHIN ABOUT 13 SECONDS OF SSME START, THE RS LAUNCH  ]
 ] SEQUENCER BEGINS TO COMMAND THE FOLLOWING MPS VALVES:               ]
 ]                                                                     ]
 ] 1. LO2 ACCUMULATOR RECIRCULATION VALVES (OPEN)                      ]
 ]                                                                     ]
 ] 2. LH2 PREVALVES (OPEN)                                             ]
 ]                                                                     ]
 ] 3. LO2 OVERBOARD BLEED VALVES (CLOSE)                               ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
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1+_____________________________________________________________________
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] DR:              ]
 ] R. L. DOBSON       ]    PASS PROGRAM NOTE        ]       38765      ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: SEPT. 1987 ]
 ] IBM/713-282-7330   ]      RELEASE NOTE ( )       ] REV G: 06/23/93  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ] RS LAUNCH SEQUENCER AND TERMINAL COUNT PROCESSING                   ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] A HOLD BEFORE SSME START IN THIS INTERVAL WITH SUBSEQUENT PRO'S TO  ]
 ] OPS 9 AND OPS 1 MAY OCCUR. IF THE LPS DOES NOT RECONFIGURE THESE    ]
 ] VALVES IN OPS 9, ON RETURN TO OPS 1 THE HFE OUTPUT WILL CONTAIN     ]
 ] THESE MPS COMMANDS THROUGHOUT MM 101 INSTEAD OF DURING THE INTERVAL ]
 ] CONSISTING OF LAST 13 SECONDS BEFORE SSME START.                    ]
 ]                                                                     ]
 ] USER RESPONSE - THE LPS SHOULD RECONFIGURE THE ABOVE VALVES IN G9   ]
 ] OR BY SACS G-MEM COMMANDS IN G101 IF A HOLD IS CALLED WITHIN 13     ]
 ] SECONDS OF SSME START.                                              ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
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 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
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