X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 11 Nov 2010 13:19:02 -0500 Message-ID: X-Original-Return-Path: Received: from elasmtp-galgo.atl.sa.earthlink.net ([209.86.89.61] verified) by logan.com (CommuniGate Pro SMTP 5.3.10) with ESMTP id 4573586 for lml@lancaironline.net; Wed, 10 Nov 2010 08:32:55 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.61; envelope-from=panelmaker@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=KmbqTqoF/sugQQIH8ofPrYLcV6uCIRVxdZ54F0rXwxXpxDbuZgL99V84X0w8+9kn; h=Received:From:To:References:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:In-Reply-To:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [209.173.71.183] (helo=DELL8300) by elasmtp-galgo.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1PGAmX-0001UN-Md for lml@lancaironline.net; Wed, 10 Nov 2010 08:32:09 -0500 From: "Jim Nordin" X-Original-To: "'Lancair Mailing List'" References: Subject: 360 flap failure (Relay Failure?) X-Original-Date: Wed, 10 Nov 2010 07:31:56 -0600 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0019_01CB80A9.69675880" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcuA1dRlJ44skyJyT7i3N/sNp63gWwABOscg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5994 X-ELNK-Trace: bdfc62829fd2a80cc8ad50643b1069f8239a348a220c26097e752a6afda7ea38ba684a063556e8d9350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 209.173.71.183 This is a multi-part message in MIME format. ------=_NextPart_000_0019_01CB80A9.69675880 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Which relays? Jim BTW, I did not use the magnetic reed switches but put in position switches. I can't see there's any problem electrically but the change did limit the variability of position of the switches. I guess that's the strength of having the reed jobbies. I have Bosch relays for this job. _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Tom McNerney Sent: Wednesday, November 10, 2010 6:50 AM To: lml@lancaironline.net Subject: [LML] 360 flap failure (Relay Failure?) 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. 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 www.N54SG.com www.CorePanels.com ------=_NextPart_000_0019_01CB80A9.69675880 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Which relays?

Jim

BTW, I did not use the magnetic reed switches but put in position switches. I can’t see there’s = any problem electrically but the change did limit the variability of = position of the switches. I guess that’s the strength of having the reed = jobbies. I have Bosch relays for this job.

 

From: = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Tom McNerney
Sent: Wednesday, November = 10, 2010 6:50 AM
To: = lml@lancaironline.net
Subject: [LML] 360 flap = failure (Relay Failure?)

 

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.

 

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

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