 +_____________________________________________________________________
 ] AUTHOR:            ]                             ] DR:              ]
 ] H. HERNANDEZ       ]    PASS PROGRAM NOTE        ]     103008       ]
 ]____________________]                             ]__________________]
 ] ORG/PHONE:         ] OPS NOTE ( )  USER NOTE (X) ] DATE: 09/20/88   ]
 ]  VG/483-0964       ]      RELEASE NOTE( )        ]                  ]
 ]____________________]_____________________________]__________________]
 ] OI/FLIGHT EFFECTIVITY:        ]  USER AFFECTED:                     ]
 ]  OI8B AND SUBS                ]  CREW ( )  GROUND (X)  DUMP ONLY ( )]
 ]_______________________________]_____________________________________]
 ]        MAJOR SOFTWARE AREA:       ] OPS MODES AFFECTED:             ]
 ]SSW ( )  GNC ( )  VU (X)  SM/PL ( )] G9                              ]
 ]_____________________________________________________________________]
 ] SOFTWARE SUB-AREA:  TFL                                             ]
 ]_____________________________________________________________________]
 ] PRINCIPAL FUNCTIONS: 4.5                                            ]
 ]_____________________________________________________________________]
 ] TITLE:                                                              ]
 ]            PCMMU FORMAT SWITCH COMMAND FAILURE                      ]
 ]_____________________________________________________________________]
 ] DESCRIPTION:                                                        ]
 ]   THE OPERATION TO SWITCH DOWNLINK FORMATS VIA THE SELECTION OF     ]
 ]   "FXD" (ITEM 1) OR "PGM" (ITEM 2) ON SPEC 62 MAY OCCASIONALLY      ]
 ]   FAIL IN A G9 RS.  WHEN THIS OPERATION IS PERFORMED IN A RS, ALL   ]
 ]   GPCS ISSUE THE COMMAND TO THE PCMMU TO SWITCH FORMATS.  TESTING   ]
 ]   IN THE SAIL WITH TWO DIFFERENT FLIGHT PCMMMUS HAS DEMONSTRATED    ]
 ]   THE PCMMU FAILS TO SWITCH FORMATS APPROXIMATELY 2% OF THE TIME    ]
 ]   WHEN THIS OPERATION IS PERFORMED WITH 4 OR 5 GPCS IN THE RS.      ]
 ]   THE PCMMU RESPONDS CORRECTLY WHEN THE OPERATION IS PERFORMED WITH ]
 ]   A SIMPLEX GPC (E.G. SM2); THEREFORE, THIS ANOMALY IS NOT A        ]
 ]   FLIGHT ISSUE.                                                     ]
 ]                                                                     ]
 ]    REF KCS IPR 36V-0139 (PR INS-4-03-0047)                          ]
 ]_____________________________________________________________________]
 ]USER RESPONSE:                                                       ]
 ]                                                                     ]
 ]    BE AWARE OF THE ABOVE CONDITION.                                 ]
 ]                                                                     ]
 ]    IF THE PCMMU DOES NOT SWITCH DOWNLINK FORMATS WHEN THE OPERATION ]
 ]    IS COMMANDED BY A RS, RE-ISSUE THE COMMAND.                      ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]                                                                     ]
 ]_____________________________________________________________________]
 ]CONCURRENCE:                           ]APPROVAL:                    ]
 ]IBM: WYATT COOPER         DATE 09/21/88]                             ]
 ]    --------------------      ---------]                             ]
 ]SSD: SAM ANKNEY           DATE 09/21/88]                             ]
 ]    --------------------      ---------] JACK G. BOYKIN      9/22/88 ]
 ]PF MGR: J D BAGWELL       DATE 09/22/88]------------------- -------- ]
 ]       -----------------      ---------] CHAIRMAN, SASCB      DATE   ]
 ]_______________________________________]_____________________________]
 @

