X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 11 Nov 2010 13:23:46 -0500 Message-ID: X-Original-Return-Path: Received: from elasmtp-spurfowl.atl.sa.earthlink.net ([209.86.89.66] verified) by logan.com (CommuniGate Pro SMTP 5.3.10) with ESMTP id 4574532 for lml@lancaironline.net; Wed, 10 Nov 2010 22:25:34 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.66; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=N+fNs8IA2RWHIOk/iHUML+GpBTprT1NxEkcb1tbpZI4Es+GBSjYXehpfBRBkiwB4; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [216.57.118.85] (helo=[192.168.1.100]) by elasmtp-spurfowl.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1PGNmV-0008SS-1o for lml@lancaironline.net; Wed, 10 Nov 2010 22:24:59 -0500 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1081) Content-Type: multipart/alternative; boundary=Apple-Mail-6--246430849 Subject: Re: [LML] 360 flap failure (Relay Failure?) X-Original-Date: Wed, 10 Nov 2010 22:24:57 -0500 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <5D88F4EF-169D-4268-A22C-0C5BF6F09CD3@earthlink.net> X-Mailer: Apple Mail (2.1081) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da9403b883d575a0cde1d6d2f3cc152ff5b76350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 216.57.118.85 --Apple-Mail-6--246430849 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Last year I looked at relay specs a lot and discovered there are really = huge differences. I ended up upgrading most of mine. Look at the specs carefully and note the max break current vs. what you = have now. Colyn On Nov 10, 2010, at 7:49 AM, Tom McNerney wrote: > 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. =46rom = 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. > =20 > The real bitch of it was this. Get it back to the hanger, reset the = flap motor breaker, select flaps up and everything works. They are back = to obeying their limit switches like normal. I probably ran those = things up and down 50 times and couldn't get it to fail again. Checked = all the wiring, couldn't find a problem. Until... I caught it. The = down flap relay fused and got stuck on, thereby bypassing the limit = switches, and pretty much everything else, only being stopped by the = flap motor blowing the breaker. Once it cooled down the relay would = release and return to normal operation. > =20 > So, even if the relay is wired correctly, and works as designed = sometimes, doesn't mean it will on short final. Relays get old, like = everything else. If I were you, you might consider new relays. (if your = airplane has them I guess) > =20 > Tom > www.N54SG.com > www.CorePanels.com --Apple-Mail-6--246430849 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Last year I looked at relay specs a lot and = discovered there are really huge differences.  I ended up upgrading = most of mine.
Look at the specs carefully and note the max break = current vs. what you have = now.

Colyn

On Nov 10, = 2010, at 7:49 AM, Tom McNerney wrote:

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.  =46rom 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.
 
The real = bitch of it was this.  Get it back to the hanger, reset the flap = motor breaker, select flaps up and everything works.  They are back = to obeying their limit switches like normal.  I probably ran those = things up and down 50 times and couldn't get it to fail again.  = Checked all the wiring, couldn't find a problem.  = Until...   I caught it.   The down flap relay fused = and got stuck on, thereby bypassing the limit switches, and pretty much = everything else, only being stopped by the flap motor blowing the = breaker.  Once it cooled down the relay would release and return to = normal operation.
 
So, even if the relay is wired correctly, and works = as designed sometimes, doesn't = mean it will on short final.  Relays get old, like everything = else.  If I were you, you might consider new relays. (if your = airplane has them I guess)
Tom

= --Apple-Mail-6--246430849--