Low Pitch Stop Fails to Extend

[chuckb]

Hey all, I'm trying to get a clear picture of what is happening when this occurs and what does the crew see when this happens. I understand the basics of the low pitch stop, but having never seen one that failed to extend, it's hard to get a clear idea of what all is going wrong.

Thanks.

[pjvr99]

Difference in torque at FI when throttle is moved from GI to FI, and

when moved from above FI back to FI. Difference should be a

minimum of 500"lb (200"lb on some special variants). Sometimes a

failure will be indicated by no difference, while the torq may hold for

a few seconds when coming back to FI, before dropping off. Also in

static operation, no hesitation at LPS angle is noted on protractor

when unfeathering to GI or Reverse

[galgany2009]

MAKE SURE THAT YOUR FLIGHT IDLE ANGLE NOT LESS THAN 17.5 DEGREE.BECAUSE YOUR LOW PICH STOP WILL NEVER ENGAGED IF YOU DONOT GET 23.5.( 6 DEGREE U GET FROM LOW PICH STOP).FOR A NEW PROP MAY BE THE LOW PITCH STOP NEED TO BE ADJUSTED SCREW IN TO INCREASE.AS PER MM.RECORD YOUR TOP OF BETA TORQUE GO TO CROSSOVER AND COME BACK TO TOP OF BETA.TORQUE INCREASE OF 200INLB.MUST BE INDICATED MORE THAN THE RECORDED TORQUE IN TOP OF BETA.HESITATION MUST BE OBSERVED AS WELL.