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Wink207

Groaning noise when arming spoilers

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So on short final I arm the spoilers by hitting shift+/ and this groaning noise starts and continues until everything is shut down. Checking outside, the spoilers don't deploy at that point and deploy perfectly on touchdown. Any ideas on the groaning noise?

 

Update: Should have searched on the forum first. Found the solution and all set.

Thanks

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Glad you got it worked out, but I wonder why you were under the impression that you needed to arm the "spoilers"?  First, the Citation II doesn't have spoilers, it has speedbrakes.  Second, even if you could arm them, they are pretty much useless on landing because they are designed to add drag only, not destroy lift, and at 100 knots, it's too slow to really be effective.  Since I've started flying the S550, I have to admit that I've not yet used the speedbrakes because I've not had to descend that fast that I hit idle thrust.

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Thanks for weighing in. I'm just accustomed to deploying spoilers/speedbrakes on touchdown. I have not yet found a need for them in flight.


Update 2: The airbrake.wav is not the culprit after all. Not sure where to go now other than the suggestion by Capt above to forget using them on touchdown or just grin and bear the growling sound.

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They really do nothing for you on landing, so I'd just forgo use of them.  Having spoken to real world Citation II and V pilots, they very rarely have to use the speedbrakes with good planning, even when making idle-power descents will yield you vertical speeds in excess of 3000 FPM without their use.

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