1+_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] M. MILLER          ]    PASS PROGRAM NOTE        ]       107107     ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:            ]
 ] LSIS/282-7167      ]      RELEASE NOTE( )        ]       04/12/94   ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] OI-21 AND SUBS                ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC ( )  VU (X)  SM/PL ( )] G9                              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  SPEC                                            ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS:  V4.2                                          ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]   MEC LEVEL 2 BTU READINESS TEST LEAVES COMMANDS ON                 ]
 ]_____________________________________________________________________]
 ]DESCRIPTION:                                                         ]
 ]                                                                     ]
 ]WHEN PERFORMING THE MEC LEVEL 2 BTU READINESS TEST ON SPEC 112       ]
 ](GPC/BTU I/F) THERE IS A POTENTIAL PROBLEM.  PHASES 2 AND 3 OF THIS  ]
 ]FOUR-PHASE TEST ACTIVATE PYRO INITIATOR CONTROLLER (PIC) CAPACITOR   ]
 ]VOLTAGE SIMULATIONS.  BECAUSE THE REQUIREMENTS DO NOT CALL FOR A     ]
 ]MASTER RESET TO BE PERFORMED AT THE END OF THESE PHASES, THE         ]
 ]SIMULATIONS REMAIN ACTIVE AND NO "CLEAN-UP" IS PERFORMED.  AS A      ]
 ]RESULT, THE USER MAY SEE ANY OR ALL OF THE FOLLOWING.                ]
 ]1) UNEXPECTED BITS TURNED ON WHEN PERFORMING THE PREFLIGHT BITE      ]
 ]   READ.  SPECIFICALLY,                                              ]
 ]  DW 12, BIT 15 - EXTERNAL TANK SEPARATION, FIRE 2 QUALIFIER (CORE A)]
 ]  DW 13, BIT 15 - EXTERNAL TANK SEPARATION, FIRE 2 QUALIFIER (CORE B)]
 ]   DW 14, BIT 15 - LT UMBILICAL UNLATCH, FIRE 2 QUALIFIER (CORE A)   ]
 ]   DW 14, BIT 18 - RT UMBILICAL UNLATCH, FIRE 2 QUALIFIER (CORE A)   ]
 ]   DW 15, BIT 15 - LT UMBILICAL UNLATCH, FIRE 2 QUALIFIER (CORE B)   ]
 ]   DW 15, BIT 18 - RT UMBILICAL UNLATCH, FIRE 2 QUALIFIER (CORE B)   ]
 ]2) SIMULATED (40 VOLTS) RATHER THAN ACTUAL PIC CAPACITOR VOLTAGE     ]
 ]   READINGS.                                                         ]
 ]3) INADVERTENT POWER APPLIED TO THE FIRE 2 QUALIFYING CIRCUIT.       ]
 ]_____________________________________________________________________]
 ] USER RESPONSE:                                                      ]
 ]                                                                     ]
 ] THE USER CAN "MANUALLY" ISSUE A MASTER RESET COMMAND VIA THE LDB    ]
 ] USING THE TCS OPERATOR CODE 19 (THE MEC COMMAND OPERATOR).          ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]LSIS:   JEAN L. ZOPHY     DATE 05/17/94]                             ]
 ]     -------------------      ---------]                             ]
 ]FDSD:   W. R. PRUETT      DATE 05/17/94]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 05/31/94 ]
 ]PF MGR: ERIC C. BINGHAM   DATE 05/17/94]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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