 +_____________________________________________________________________
  AUTHOR:                                          DR:              
  TREVOR TIDWELL         PASS PROGRAM NOTE                110402    
 ____________________                             __________________
  ORG/PHONE:          OPS NOTE (X)  USER NOTE ( )  DATE:            
  SSOAS/(281)335-2214      RELEASE NOTE( )                07/09/97  
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  OI/FLIGHT EFFECTIVITY:          USER AFFECTED:                     
   OI-26B                         CREW ( )  GROUND (X)  DUMP ONLY ( )
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         MAJOR SOFTWARE AREA:        OPS MODES AFFECTED:             
 SSW ( )  GNC (X)  VU ( )  SM/PL ( )             G9                  
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  SOFTWARE SUB-AREA: COMMFAULTS                                       
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  PRINCIPAL FUNCTIONS: 4.17                                           
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  TITLE: POSSIBLE USE OF INVALID DATA WHEN TRANSITIONING GPS I/O      
         CONTROL IN OPS 9.                                            
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  DESCRIPTION:                                                        
                                                                      
     THIS PROBLEM CAN OCCUR WHEN THE FSW IS IN OPS 9, THE GPS STATUS  
  DISPLAY IS CALLED UP AND A VALUE OF 1 FOR THE GPS I/O CONTROL       
  (ITEM 10) IS CURRENTLY OPERATIVE, INDICATED BY AN "I" DISPLAYED     
  NEXT TO ITEM 10.  IF THE GPS RECEIVER SHOWS THAT IT IS PRESENTLY    
  COMMFAULTED (AN "M" IS DISPLAYED IN THE STAT FIELD OF THE RELEVANT  
  RECEIVER) AND AN ITEM ENTRY IS INITIATED TO TRANSITION TO FLIGHT    
  I/O (ITEM 10 EXEC, RESULTING IN AN "*" DISPLAYED NEXT TO ITEM 10),  
  THEN THE GPS SUBSYSTEM OPERATING PROCEDURE (GPS SOP) WILL PROCESS   
  INVALID DATA FOR ONE OR TWO SECONDS.                                
                                                                      
                                                                      
                                                                      
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 USER RESPONSE:                                                       
                                                                      
     BE AWARE OF THE ABOVE SITUATION.  IF A COMMFAULT MANIFESTS       
  ITSELF WHILE THE ABOVE CONDITIONS APPLY AND THE POSSIBILITY OF      
  PROCESSING BAD DATA IS UNACCEPTABLE THEN ENSURE THAT THE COMMFAULT  
  IS CLEARED UP BEFORE TRANSITIONING FROM NON-COMMFAULTABLE I/O TO    
  FLIGHT I/O.                                                         
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
 _____________________________________________________________________
 CONCURRENCE:                           APPROVAL:                    
 SSOAS: JOHN MAGLEY        DATE 9/9/97                               
       ------------------      ---------                             
 ASD:  ERIC C. BINGHAM     DATE 9/9/97                               
       ------------------      --------- DARRELL E. STAMPER 10/01/97 
 PF MGR: M. N. MONTEZ      DATE 9/9/97  ------------------- -------- 
        -----------------      --------- CHAIRMAN, SASCB      DATE   
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