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Droop check


mrjpc130h
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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

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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."

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  • 3 years later...

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%)

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