 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] JOHN W. BRADBURY   ]    PASS PROGRAM NOTE        ]     53224        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 5/4/83     ]
 ] IBM/282-2300       ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]    OI2 AND SUBS               ]  CREW (X)  GROUND ( )  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW (X)  GNC (X)  VU ( )  SM/PL ( )] 0, G1, G2, G3, G6, G8, G9, S2,  ]
 ]                                   ] S4, PL9                         ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  RCS, RM, OPS, TRANSITIONS                       ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.91                                           ]
 ]_____________________________________________________________________]
 ] TITLE:  FALSE JET-FAILED-OFF INDICATIONS                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]IF ONE OR MORE RCS JETS ARE FIRING WHEN AN OPS TRANSITION IS         ]
 ]INITIATED, THE RCS RM FAIL-OFF COUNTERS FOR THOSE JETS WILL BE       ]
 ]INCREMENTED BY ONE.  IF THE JETS ALREADY HAVE OR OBTAIN TWO          ]
 ]ADDITIONAL FAILOFF COUNTS WITHOUT SUCCESSFULLY FIRING, THE JETS      ]
 ]WILL BE DECLARED FAILED OFF BY RCS RM.  THESE FAILURES, WHICH ARE    ]
 ]FALSELY DECLARED BECAUSE ONE OF THE THREE FAIL-OFF COUNTS IS NOT     ]
 ]LEGITIMATE, MAY OCCUR AT THE FOLLOWING TIMES:                        ]
 ]                                                                     ]
 ]A. IMMEDIATELY UPON ENTERING THE NEW OPS (IF THE JET HAS TWO FAIL-   ]
 ]   OFF COUNTS PRIOR TO THE OPS TRANSITION).                          ]
 ]                                                                     ]
 ]B. SOMETIME LATER IN THE NEW OPS OR IN SUBSEQUENT OPS (IF THE JET HAS]
 ]   ZERO OR ONE FAIL-OFF COUNTS PRIOR TO THE OPS TRANSITION AND       ]
 ]   OBTAINS TWO OR MORE FAIL-OFF COUNTS FOLLOWING THE OPS TRANSITION).]
 ]                                                                     ]
 ]C. DURING THE RCS DRIVERS TEST ON SPEC 41 (RGA/ADTA/RCS DISPLAY) IN  ]
 ]   OPS 8 (IF THE JET HAS ZERO OR ONE FAIL-OFF COUNTS PRIOR TO THE    ]
 ]   OPS TRANSITION).                                                  ]
 ]                                                                     ]
 ]IN CASES (A) AND (B), THE INDIVIDUAL JETS MAY FAIL AT DIFFERENT      ]
 ]TIMES.  IN CASE (C), ANY JETS THAT WERE FIRING WHEN THE OPS TRANSI-  ]
 ]TION OCCURRED MAY FAIL IF THE RCS DRIVERS TEST IS PERFORMED FOR ALL  ]
 ]THREE RJD GROUPS.                                                    ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 @
 +_____________________________________________________________________
 ]                                                                     ]
 ]                       SUPPLEMENTAL SHEET                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] AUTHOR:            ]                             ] DR:              ]
 ] JOHN W. BRADBURY   ]    PASS PROGRAM NOTE        ]     53224        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 5/4/83     ]
 ] IBM/282-2300       ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] TITLE:                                                              ]
 ]         FALSE JET-FAILED-OFF INDICATIONS                            ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ] FOR ALL CASES, THE PROBLEM CAN BE AVOIDED BY ENSURING THAT NO JETS  ]
 ] ARE FIRING WHEN AN OPS TRANSITION IS PERFORMED.  PLACE THE FLIGHT   ]
 ] CONTROL SYSTEM IN A FREE DRIFT STATE BY MODING THE DAP TO MANUAL AND]
 ] EITHER ROTATION PULSE OR ROTATION ACCEL SUBMODE (IN ALL THREE AXES) ]
 ] VIA THE PBI'S.  CASE (C) CAN ALSO BE AVOIDED BY PERFORMING A JET RE-]
 ] SET (ITEM 45 ON SPEC 23, THE RCS DISPLAY) PRIOR TO INITIATING THE   ]
 ] RCS DRIVERS TEST FOR THE FIRST RJD GROUP.                           ]
 ]                                                                     ]
 ] IF CASES (A) OR (C) DO OCCUR, RESELECT THE FAILED JETS VIA ITEM     ]
 ] ENTRY ON SPEC 23 AND THEN PERFORM A JET RESET (ITEM 45 ON SPEC 23). ]
 ] IF CASE (B) OCCURS, DO THE SAME THING, BUT MONITOR THE JET(S)       ]
 ] CLOSELY BECAUSE CASE (B) IS INDISTINGUISHABLE FROM A TRUE FAILURE.  ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
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 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 7/27/88 ]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 7/28/88 ]                             ]
 ]    --------------------      ---------] RW MOOREHEAD        7/30/88 ]
 ]PF MGR: LW JENKINS/WELLS  DATE 7/29/88 ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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