 +_____________________________________________________________________
  AUTHOR:                                          DR:              
  L. ORTIZ               PASS PROGRAM NOTE                30139     
 ____________________                             __________________
  ORG/PHONE:          OPS NOTE ( )  USER NOTE (X)  DATE:  10/24/89  
  LSIS/282-7458            RELEASE NOTE( )         REV B: 07/03/95  
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  OI/FLIGHT EFFECTIVITY:          USER AFFECTED:                     
   STS-1 AND SUBS                 CREW ( )  GROUND (X)  DUMP ONLY ( )
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         MAJOR SOFTWARE AREA:        OPS MODES AFFECTED:             
 SSW ( )  GNC ( )  VU (X)  SM/PL ( ) G9, G8                          
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  SOFTWARE SUB-AREA:  HSI, DED-DISP                                   
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  PRINCIPAL FUNCTIONS: V4.13                                          
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  TITLE:                                                              
  HSI TRUNCATION OF THE RANGE COUNTERS                                
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  DESCRIPTION:                                                        
                                                                      
  THE HORIZONTAL SITUATION INDICATOR (HSI) PRIMARY AND SECONDARY      
  RANGE DIGITAL COUNTERS TRUNCATE THE LOW ORDER DIGIT FOR VALUES      
  THAT DRIVE THE HIGH ORDER DIGIT (I.E., THE LOW ORDER DIGIT IS       
  SET TO ZERO WHENEVER THE HIGH ORDER DIGIT IS ONE OR GREATER).       
  THE HSI PRIMARY HI-TEST VALUE OF 3456 IN OPS G9 WILL BE             
  DISPLAYED AS 3450.                                                  
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
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 USER RESPONSE:                                                       
                                                                      
  NONE (EXPLANATION OF DDU/HSI HARDWARE).                             
                                                                      
  DISPLAY DRIVER UNIT (DDU) SPEC MC409-0023, DATED 6 JUN 1977, REV C  
  FIG 7 (PAGE 42) AND PARAGRAPH 3.2.1.5.1 (PAGE 43) STATES FOR DIS-   
  TANCE FORMAT, "MAX DISTANCE IS 3,990 NM, THE LEAST SIGNIFICANT      
  DIGIT WILL BE ISSUED AS (0) AT 1,000 NM OR MORE."                   
                                                                      
                                                                      
                                                                      
 _____________________________________________________________________
 CONCURRENCE:                           APPROVAL:                    
 LSIS:  HUGH D. STOVALL    DATE 08/30/95                             
      -------------------      ---------                             
 ASD:   ERIC C. BINGHAM    DATE 08/31/95                             
      -------------------      --------- DARRELL E. STAMPER 09/05/95 
 PF MGR: ERIC C. BINGHAM   DATE 08/31/95------------------- -------- 
        -----------------      --------- CHAIRMAN, SASCB      DATE   
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