 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] S. JACKSON         ]    PASS PROGRAM NOTE        ]     30526        ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: JULY 1987  ]
 ] ENG/282-8542       ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ] REL 19 AND SUBS               ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )]  G8                             ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  COMMFAULTS, FCS, SWITCHES                       ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: V5.1.7                                         ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ] COMMFAULT STATUS NOT CHECKED FOR FCS CHANNEL SWITCHES               ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]                                                                     ]
 ] LACK OF COMMFAULT CHECKING FOR FCS CHANNEL SWITCHES IN G8 CAN       ]
 ] CAUSE AN ERRONEOUS OVERRIDE TO BE ISSUED TO AEROSURFACE ACTUATORS.  ]
 ] TWO FAILURES ARE REQUIRED TO CAUSE A PROBLEM, AT LEAST ONE OF       ]
 ] WHICH IS COMMFAULTABLE, I.E., DUE TO AN MDM FAILURE AS OPPOSED      ]
 ] TO A CONTACT FAILURE IN THE SWITCH (TWO CONTACT FAILURES ALWAYS     ]
 ] CAUSE A PROBLEM, WITH OR WITHOUT COMMFAULT CHECKING). OF THE 12     ]
 ] POSSIBLE COMBINATIONS OF 2 FAILURES (AT LEAST ONE OF WHICH IS       ]
 ] COMMFAULTABLE) AND ACTUAL SWITCH POSITION, ONLY 2 PRODUCE           ]
 ] ERRONEOUS OVERRIDES IN G8. SHOULD THIS CONDITION OCCUR, IT WOULD    ]
 ] MASK A DELTA PRESSURE BYPASS (THIRD INDEPENDENT FAILURE) IF ONE     ]
 ] EXISTED. THIS CONDITION IS CORRECTED IN G3, HOWEVER, EVEN WITH      ]
 ] COMMFAULT CHECKING AND RM LOGIC IT IS POSSIBLE TO ERRONEOUSLY       ]
 ] RESET OVERRIDES. THE FSP MESSAGE 'BCE STRG (1,2,3) B' INDICATES     ]
 ] FF PROM SEQ 2-6, INCLUDING FCS CHANNEL SWITCH, HAVE BEEN            ]
 ] BYPASSED.                                                           ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ] WITH ONE OR TWO FCS CHANNEL SWITCH INPUTS BYPASSED, MONITOR GOOD    ]
 ] SWITCH INPUT AND OVERRIDE OUTPUT (WITH GROUND ASSISTANCE IF         ]
 ] AVAILABLE) TO DETERMINE POTENTIAL DELTA-PRESSURE BYPASS IN G8.      ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 7/28/88 ]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 9/14/88 ]                             ]
 ]    --------------------      ---------] JACK G BOYKIN       9/20/88 ]
 ]PF MGR: J VERNON          DATE 7/29/88 ]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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