 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ]  J. L. ZOPHY       ]    PASS PROGRAM NOTE        ]     100737       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE:  05/14/91  ]
 ]  IBM/282-8409      ]      RELEASE NOTE( )        ] REV A: 08/01/91  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI20 AND SUBS                ]  CREW (X)  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC (X)  VU ( )  SM/PL ( )]  G6, G3                         ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA: FCS                                              ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.59                                           ]
 ]_____________________________________________________________________]
 ] TITLE: NWS SYSTEMS CANNOT BE USED AS BACKUPS FOR EACH OTHER         ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]     WHEN UPGRADED NWS HARDWARE IS BEING USED; FOR A FAILURE OF      ]
 ] NWS1 ON ROLLOUT WHICH CAUSES THE NWS SYSTEM TO DOWNMODE TO FREE     ]
 ] CASTER, THE NWS SYSTEM MAY NOT BE SUCCESSFULLY RECOVERED AFTER      ]
 ] SELECTING THE ALTERNATE NWS2 CHANNEL.  IMMEDIATE DOWNMODING (IN     ]
 ] 240 MSEC.) IS LIKELY TO OCCUR IF A LARGE RUDDER PEDAL COMMAND IS    ]
 ] PRESENT AT THE TIME THE NWS2 MODE IS SELECTED.                      ]
 ]                                                                     ]
 ]                                                                     ]
 ]     NOTE: THIS CAN ALSO HAPPEN IF NWS2 FAILS AND THE MODE IS        ]
 ] CHANGED TO NWS1 DURING ROLLOUT.                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]  IF A NWS1 CHANNEL FAILURE OCCURS DURING ROLLOUT (POST NOSE GEAR    ]
 ]  TOUCHDOWN), THE USER CANNOT RELY ON NWS2 FOR PROVIDING A BACKUP    ]
 ]  COMPUTER MODE OF NWS.  UPON SELECTING NWS2, THE NWS SYSTEM MAY     ]
 ]  IMMEDIATELY (240 MSEC) AND UNNOTICEABLY DOWNMODE TO FREE CASTER,   ]
 ]  AND THE USER WILL HAVE TO USE DIFFERENTIAL BRAKING TO MAINTAIN     ]
 ]  VEHICLE DIRECTIONAL CONTROL.                                       ]
 ]                                                                     ]
 ]  IF A NWS1 CHANNEL FAILURE OCCURS PRIOR TO NOSE GEAR TOUCHDOWN,     ]
 ]  THE USER SHOULD SELECT NWS2 IN ORDER TO REGAIN THE ALTERNATE       ]
 ]  COMPUTER MODE OF NWS.                                              ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: PATTI A. THORNTON    DATE 08/21/91]                             ]
 ]    --------------------      ---------]                             ]
 ]FDSD: ROBERT N. HINSON    DATE 08/22/91]                             ]
 ]     -------------------      ---------] DARRELL E. STAMPER 09/18/91 ]
 ]PF MGR:   KENNY TODD      DATE 09/18/91]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
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