 +_____________________________________________________________________
  AUTHOR:                                          DR:              
     K. M. NUZENSKI      PASS PROGRAM NOTE              102822      
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  ORG/PHONE:          OPS NOTE ( )  USER NOTE (X)  DATE:  08/30/88  
     IBM/282-7760          RELEASE NOTE( )         REV B: 09/26/90  
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  OI/FLIGHT EFFECTIVITY:          USER AFFECTED:                     
     OI8D AND SUBS                CREW (X)  GROUND (X)  DUMP ONLY ( )
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         MAJOR SOFTWARE AREA:        OPS MODES AFFECTED:             
 SSW ( )  GNC (X)  VU ( )  SM/PL ( )    G1, G2, G3, G8               
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  SOFTWARE SUB-AREA:  DED DISP                                        
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  PRINCIPAL FUNCTIONS:  4.180 (GN&C SWITCH PROC)                      
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  TITLE:  DEFAULT POSITIONS INITIALLY SELECTED FOR SIMPLEX            
          SWITCHES WITH INVALID INPUTS                                
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  DESCRIPTION:                                                        
    IF INVALID INPUTS (EITHER NONE OR MULTIPLE POSITIONS INDICATED)   
    ARE DETECTED FOR A SIMPLEX SWITCH ON THE FIRST PASS THAT THE      
    SWITCH IS PROCESSED IN AN OPS, THE DEFAULT POSITION FOR           
    THAT SWITCH IS SELECTED, REGARDLESS OF ANY SWITCH POSITION        
    SELECTED IN A PREVIOUS OPS.  THE DEFAULT POSITION WILL ALSO BE    
    SELECTED IF THE INVALID INPUT PERSISTS FOR 3 SECONDS, OR IF A     
    COMMFAULT IS PRESENT.                                             
                                                                      
    THE FOLLOWING SWITCHES ARE AFFECTED:                              
   ADI ATTITUDE (LEFT/RIGHT/AFT)        RA SEL (LEFT/RIGHT)           
   ADI ERROR    (LEFT/RIGHT/AFT)        HSI  MODE  (LEFT/RIGHT)       
   ADI RATE     (LEFT/RIGHT/AFT)        HSI  SOURCE (LEFT/RIGHT)      
   AIR DATA SOURCE SEL (LEFT/RIGHT)     HSI  TRANSCEIVER (LEFT/RIGHT) 
                                                                      
                                                                      
                                                                      
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  USER RESPONSE:                                                      
     BE AWARE OF THIS SITUATION.  IF THE SWITCH IS SET TO ITS'        
     DEFAULT POSITION ON THE FIRST PASS IT IS PROCESSED IN AN OPS,    
     THE DEFAULT POSITION WILL BE SELECTED, REGARDLESS OF ANY         
     FAILURES THAT MIGHT BE PRESENT.                                  
                                                                      
                                                                      
                                                                      
                                                                      
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 CONCURRENCE:                           APPROVAL:                    
 IBM: PATTI A. THORNTON    DATE 11/16/90                             
     --------------------      ---------                             
 FDSD:   W. R. PRUETT      DATE 11/19/90                             
      -------------------      --------- DARRELL E. STAMPER 11/20/90 
 PF MGR:  KENNY TODD       DATE 11/19/90------------------- -------- 
        -----------------      --------- CHAIRMAN, SASCB      DATE   
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