Mailing List lml@lancaironline.net Message #56693
From: Adam Molny <Adam@ValidationPartners.com>
Sender: <marv@lancaironline.net>
Subject: RE: Crazy flap wiring (was 360 flap relay failure)
Date: Fri, 12 Nov 2010 16:46:13 -0500
To: <lml@lancaironline.net>

When I first saw the recommended flap wiring method in the Legacy builder’s manual I thought “Gee, that’s overly complicated”. Why use a DPDT switch to control the relays? But now I realize that the designers were allowing for this very situation. When the switch is in the center position all power is removed from the motor. So even if you have a stuck relay the motor will coast to a stop when you release the switch (but you do lose the dynamic braking effect).

 

-Adam Molny


 

In a message dated 11/10/2010 6:50:15 A.M. Central Standard Time, dudewanarace@yahoo.com writes:

So I'm on downwind, select a touch of flaps on my momentary flap down switch, and I soon find the flaps are still extending.  Pushing the flaps up button does nothing.  They continue past the limit switch until the flap motor hits the mechanical limit and pops the breaker.  From the cockpit I could look directly down at the ground where the flaps normally are.  Not to mention the fact that it felt like a massive speed brake.  I was able to land with very little pitch up authority left.  This all happened in about, oh.. 25 seconds.

  

Tom

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