 +_____________________________________________________________________
  AUTHOR:                                          DR:              
   WENDY WILKINSON       PASS PROGRAM NOTE                108055    
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  ORG/PHONE:          OPS NOTE (X)  USER NOTE ( )  DATE:            
   LSIS/282-7211           RELEASE NOTE( )                01/24/96  
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  OI/FLIGHT EFFECTIVITY:          USER AFFECTED:                     
  OI-24 THRU OI-26B               CREW (X)  GROUND (X)  DUMP ONLY ( )
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         MAJOR SOFTWARE AREA:        OPS MODES AFFECTED:             
 SSW ( )  GNC ( )  VU ( )  SM/PL (X)   S2, S4                        
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  SOFTWARE SUB-AREA:  HYD                                             
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  PRINCIPAL FUNCTIONS:  S6.10                                         
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  TITLE:                                                              
          LOCK OUT OF AUTOMATIC CIRC PUMP CONTROL                     
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  DESCRIPTION:                                                        
                                                                      
   WHEN, FOR ANY OF THE THREE HYDRAULIC SYSTEMS                       
    (A) BOTH THE RESERVOIR AND ACCUMULATOR PRESSURES GO OUT OF LIMITS 
        LOW ON THE SAME (SM) GPC CYCLE,                               
        (EITHER BEING OUT OF LIMITS LOW IS INDICATED BY THE WARNING   
         "CIRC PUMP".  BOTH BEING OUT OF LIMITS WOULD BE INDICATED    
         BY THEIR STATUS ON THE SM SYSTEM SUMMARY 2 DISPLAY)          
   AND                                                                
    (B) ONE OF THE PRESSURES IS WITHIN LIMITS WHEN THE RUN TIMER      
        EXPIRES (GENERALLY 2 MINUTES LATER), BUT                      
        THE OTHER IS STILL OUT OF LIMITS, THE CIRC PUMP FOR THAT      
        HYDRAULIC SYSTEM WILL BE TURNED OFF AND WILL NOT BE           
        AUTOMATICALLY CYCLED AGAIN UNTIL THE OTHER PRESSURE           
        COMES BACK INTO LIMITS                                        
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 USER RESPONSE:                                                       
                                                                      
       IF THE CREW OR GROUND SEES THAT THE CONDITIONS FOR AUTOMATIC   
  CIRC PUMP TURN-ON EXIST (I.E. LOW ACCUMULATOR OR RESERVOIR PRESSURE)
  YET THE PUMP IS NOT RUNNING, THEN THE ABOVE SCENARIO MIGHT HAVE     
  OCCURRED.  TO GET OUT OF THIS SITUATION, HAVE THE CREW MANUALLY     
  CYCLE THE CIRC PUMP TO ON AND THEN RETURN IT TO THE GPC             
  POSITION, OR KEEP THE CIRC PUMP RUNNING, OR TMBU NEW VALUES FOR     
  THE ACCUMULATOR AND RESERVOIR PRESSURES THAT CAUSE THE CURRENT      
  PRESSURES TO BE 'IN LIMITS,' AND THEN RESTORE THE ORIGINAL          
  PRESSURE LIMITS.                                                    
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 CONCURRENCE:                           APPROVAL:                    
 LSIS:   JEAN L. ZOPHY     DATE 02/27/96                             
      -------------------      ---------                             
 ASD:   ERIC C. BINGHAM    DATE 02/27/96                             
      -------------------      --------- DARRELL E. STAMPER 03/07/96 
 PF MGR:  JAMES BAGWELL    DATE 02/27/96------------------- -------- 
        -----------------      --------- CHAIRMAN, SASCB      DATE   
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