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Date: Wed, 10 Nov 2010 07:49:47 -0500
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From: Tom McNerney <dudewanarace@yahoo.com>
Subject: 360 flap failure (Relay Failure?)
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So I'm on downwind, select a touch of flaps on my momentary flap down switc=
h, =0Aand I soon find the flaps are still extending.=A0 Pushing the flaps u=
p button does =0Anothing.=A0 They continue past the limit switch until the =
flap motor hits the =0Amechanical limit and pops the breaker.=A0 From the c=
ockpit I could look directly =0Adown at the ground where the flaps normally=
 are.=A0 Not to mention the fact that =0Ait felt like a massive speed brake=
.=A0 I was able to land with very little pitch =0Aup authority left.=A0 Thi=
s all happened in about, oh.. 25 seconds.=0A=0AThe real bitch of it was thi=
s.=A0 Get it back to the hanger, reset the flap motor =0Abreaker, select fl=
aps up and everything works.=A0 They are back to obeying their =0Alimit swi=
tches like normal.=A0 I probably ran those things up and down 50 times =0Aa=
nd couldn't get it to fail again.=A0 Checked all the wiring, couldn't find =
a =0Aproblem.=A0 Until...=A0=A0 I caught it.=A0=A0 The down flap relay fuse=
d and got stuck on, =0Athereby bypassing the limit switches, and pretty muc=
h everything else, only =0Abeing stopped by the flap motor blowing the brea=
ker.=A0 Once it cooled down the =0Arelay would release and return to normal=
 operation.=0A=0ASo, even if the relay is wired correctly, and works as des=
igned sometimes, =0Adoesn't mean it will on short final.=A0 Relays get old,=
 like everything else.=A0 If =0AI were you, you might consider new relays. =
(if your airplane has them I guess)=0A=0ATom=0Awww.N54SG.com=0Awww.CorePane=
ls.com 
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<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></he=
ad><body><div style=3D"font-family:times new roman, new york, times, serif;=
font-size:12pt"><DIV>So I'm on downwind, select a touch of flaps on my mome=
ntary flap down switch, and I soon find the flaps are still extending.&nbsp=
; Pushing the flaps up button does nothing.&nbsp; They continue past the li=
mit switch until the flap motor hits the mechanical limit and pops the brea=
ker.&nbsp; From the cockpit I could look directly down at the ground where =
the flaps normally are.&nbsp; Not to mention the fact that it felt like a m=
assive speed brake.&nbsp; I was able to land with very little pitch up auth=
ority left.&nbsp; This all happened in about, oh.. 25 seconds.</DIV>=0A<DIV=
>&nbsp;</DIV>=0A<DIV>The real bitch of it was this.&nbsp; Get it back to th=
e hanger, reset the flap motor breaker, select flaps up and everything work=
s.&nbsp; They are back to obeying their limit switches like normal.&nbsp; I=
 probably ran those things up and down 50 times and couldn't get it to fail=
 again.&nbsp; Checked all the wiring, couldn't find a problem.&nbsp; Until.=
..&nbsp;&nbsp; I caught it.&nbsp;&nbsp; The down flap relay fused and got s=
tuck on, thereby bypassing the limit switches, and pretty much everything e=
lse, only being stopped by the flap motor blowing the breaker.&nbsp; Once i=
t cooled down the relay would release and return to normal operation.</DIV>=
=0A<DIV>&nbsp;</DIV>=0A<DIV>So, even if the relay is wired correctly, and w=
orks as designed <U>sometimes</U>, doesn't mean it will on short final.&nbs=
p; Relays get old, like everything else.&nbsp; If I were you, you might con=
sider new relays. (if your airplane has them I guess)</DIV>=0A<DIV>&nbsp;</=
DIV>=0A<DIV>Tom</DIV>=0A<DIV><A href=3D"http://www.n54sg.com/">www.N54SG.co=
m</A></DIV>=0A<DIV><A href=3D"http://www.corepanels.com/">www.CorePanels.co=
m</A> </DIV></div></body></html>
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