mrjpc130h Posted April 30, 2013 Share Posted April 30, 2013 Does anyone can explain wht droop cx is? I couldnt find any pub that tell about droop cx on C130h... Pls help Quote Link to comment Share on other sites More sharing options...
Ronc Posted April 30, 2013 Share Posted April 30, 2013 mrjpc130h, Not sure anymore but it used to be in the FCF pubs (6cf). As my memory serves me, you push all the throttles up to 100%, RPM (lights out) and select a master prop. Now pull the master back to flight idle and watch the RPMs on the other three props, the RPMs should decrease by up to 2%. Before the solid-state syncs you would then push the resysnc switch and observe an additional decrease, (sorry can't remember how much. Hope that helps! Ron Quote Link to comment Share on other sites More sharing options...
victorp1 Posted April 30, 2013 Share Posted April 30, 2013 That was a term used when checking to see if the slave propellers would follow the selected master when its throttle was retarded to flight idle during a ground synchrophaser check. You would see what RPM the slaves would droop to when the master RPM was reduced. The following is an example from a procedure for a tube-type sysnchrpahser system. "Retard No. 2 throttle to the FLIGHT IDLE position. RESULT: No. 2 engine RPM should decrease to the RPM shown in figure x-x. Within 15 seconds of completion of the throttle movement, the RPM of the slave engines should decrease by 1 to 3 percent." Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted April 30, 2013 Share Posted April 30, 2013 Some call it the Syncrophase check now... Quote Link to comment Share on other sites More sharing options...
mrjpc130h Posted May 1, 2013 Author Share Posted May 1, 2013 Its really help me much....tq sirs! Quote Link to comment Share on other sites More sharing options...
gizzard Posted May 1, 2013 Share Posted May 1, 2013 Oh so that is what droop check meant. I thought it meant.. UHHH never mind!!!!! Quote Link to comment Share on other sites More sharing options...
SEFEGeorge Posted May 1, 2013 Share Posted May 1, 2013 Oh so that is what droop check meant. I thought it meant.. UHHH never mind!!!!! Well Giz for us old folks you just might be correct. Quote Link to comment Share on other sites More sharing options...
Sparks Posted May 2, 2013 Share Posted May 2, 2013 Was that a drop check/finger sweep? Quote Link to comment Share on other sites More sharing options...
RRR Posted March 24, 2017 Share Posted March 24, 2017 The purpose of the Synchrophaser System Droop Check was to ensure that the slave propellers will only drop a maximum of three percent (3%) in the event the master propeller/engine encountered a flameout or wind down. Note: At one time the maximum RPM drop was four percent (4%) Quote Link to comment Share on other sites More sharing options...
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