My question is, Why mount the ELT on the ground plane? An ELT when working requires nothing but an antenna off the top. If you are using a separate antenna I would move the ELT to the side. I have 3 ELT's 2 are mounted to the side of the fuselage (1 fabric 1 glass) with the antenna hooked to the ELT. The last one is mounted to a flat board with the Strobe box, ox bottle,and a few other small items and the antenna is mounted on the top with a 4"x4" sheet of aluminum. This airplane is fabric to. 2 of these planes are certified.
--- On Mon, 10/13/08, Martek Mississippi <rep...@martekmississippi.com> wrote: From: Martek Mississippi <rep...@martekmississippi.com> Subject: Re: KR> Narco ELT-10 battery corrosion To: "KRnet" <kr...@mylist.net> List-Post: krnet@list.krnet.org Date: Monday, October 13, 2008, 10:05 PM Could it be that you should be grounding the ELT case to the aluminum plate after all? That way there would be no difference of potential and no electrolysis. ----- Original Message ----- From: "Oscar Zuniga" <taildr...@hotmail.com> To: "Pietenpol List" <pietenpol-l...@matronics.com>; <kr...@mylist.net> Sent: Monday, October 13, 2008 9:51 PM Subject: KR> Narco ELT-10 battery corrosion Question for you electronics geeks. I have an older Narco ELT (yes, it's the honkin' big orange thing that only xmits on 121.5). When my Piet went over on its nose a few years ago, the ELT didn't go off but the incident was sufficient to make me replace the battery since I'm an FAR-abiding pilot and aircraft owner and that's what the FARs call for. I replaced the battery with a brand new Airtex replacement from Chief Aircraft and reinstalled the ELT in a better location (behind the pilot's seat), secured it on the ground plane (a large flat piece of aluminum behind the pilot's seat), and we're good to go again. Now the problem. About two years later, there is a white powdery corrosion showing up under the ELT, mostly under the battery where it sits on the aluminum ground plane. Mind you, I painted the aluminum with an epoxy paint before the installation and the battery housing is thick orange plastic, so there really isn't anything electrical touching anything metallic. So what am I doing wrong? Should I replace the battery and reinstall the unit with a rubber cushion between it and the ground plane that it's installed on (along with the ELT antenna)? I guess it really doesn't matter since nobody will hear the tree fall in the forest after next February anyway, as long as I stay on 121.5 Mhz ;o) Oscar Zuniga Air Camper NX41CC San Antonio, TX mailto: taildr...@hotmail.com website at http://www.flysquirrel.net _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
