 +_____________________________________________________________________
  AUTHOR:                                          DR:              
  SAUD HUSSEIN           PASS PROGRAM NOTE             110493       
 ____________________                             __________________
  ORG/PHONE: USA/PASS OPS NOTE (X)  USER NOTE ( )  DATE:            
  (281)282-3780            RELEASE NOTE( )                 03/18/99 
 ___________________________________________________________________
  OI/FLIGHT EFFECTIVITY:          USER AFFECTED:                     
  OI-26 THROUGH OI-28             CREW ( )  GROUND (X)  DUMP ONLY ( )
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         MAJOR SOFTWARE AREA:        OPS MODES AFFECTED:             
 SSW ( )  GNC (X)  VU ( )  SM/PL ( ) G1, G6                          
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  SOFTWARE SUB-AREA:  DOWNLIST, GUID                                  
 _____________________________________________________________________
  PRINCIPAL FUNCTIONS: 4.1, 4.2, 4.4, 4.5                             
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  TITLE:                                                              
    INCORRECT NUMBER OF RUNNING ENGINES DOWNLISTED                    
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  DESCRIPTION:                                                        
                                                                      
     THE NUMBER OF RUNNING SSMES (N_SSME, MSID = V90U1962C)           
     DOWNLISTED TO THE GROUND BE INCORRECT.  THIS CAN ONLY OCCUR      
     WHEN ONE OR MORE SSME'S ARE FAILED.  THE DOWNLIST VALUE WILL     
     BE CORRECT FOR MOST OF THE ASCENT GUIDANCE PHASE OF THE MISSION  
     EXCEPT FOR AN OCCASIONAL DOWNLIST PASS THAT WILL REPORT AN       
     INTERMEDIATE (HIGHER) VALUE OF THE NUMBER OF RUNNING SSMES.      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
 _____________________________________________________________________
 USER RESPONSE:                                                       
                                                                      
     BE AWARE OF THE POSSIBILITY THAT THE DOWNLISTED N_SSME MAY       
     BRIEFLY (ONE DOWNLIST CYCLE) HAVE A VALUE THAT IS GREATER THAN   
     THE ACTUAL NUMBER OF RUNNING SSME'S.                             
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
 _____________________________________________________________________
 CONCURRENCE:                           APPROVAL:                    
 USA/PASS:  JOHN MAGLEY    DATE 04/27/99                             
         ----------------      ---------                             
 CHAIR:    KENNETH HILL    DATE 04/27/99                             
         ----------------      ---------                             
 PF MGR:  BRET PICKA       DATE 04/30/99DARRELL E. STAMPER 04/30/1999
          KHO NGUYEN            04/30/99------------------ ----------
         ANDREW FLOTTORP        04/30/99 CHAIRMAN, SASCB      DATE   
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