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  #1  
Old 01-27-2022, 02:24 PM
K=1/2mv^2 K=1/2mv^2 is offline
 
Join Date: Jan 2022
Location: Colorado Springs
Posts: 3
Default ACK E-04 ELT false triggers when the avionics is turned on.

Has anyone had any problems with their ACK E-04 ELT going off when the avionics is turned on? RV14a getting close to maiden flight, however the ELT unit does not like all our radios being turned on. We disconnected the remote cable and the GPS info cable, leaving the ACK E-04 ELT unit with only the coax, static suppression device, and its antenna connected, yet the ACK E-04 falsely triggers. The coax cable does not run with any other cables and has good integrity with no shorts to ground. Coax does end up going to ground at the antenna mount (by design). The closest antenna is on the bottom side about 4 feet forward of the ACK E-04 ELT. We disconnected the antenna from the coax, unit still false trips. It appears the energy from our radios is getting thru the plastic casing of the ACK E-04 ELT.

We can keep this from happening if we wrap the ACK E-04 ELT in aluminum foil. We are using the heavy-duty Reynolds wrap, aviation grade (2 layers). I would prefer a more professional solution than Reynold’s wrap. We are using the Dynon AFS AF-5600 in a dual EFIS configuration with SKYVIEW SV-COM-X25/H, Skyview SV-ADSB-472, Skyview SV-XPNDR-261, Avidyne IFD-440. We don’t even have to transmit on com to have the ELT false trip, which likely means this is triggering from the ADSB out.
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  #2  
Old 01-27-2022, 02:36 PM
philb philb is offline
 
Join Date: Apr 2005
Location: Salt Lake City
Posts: 197
Default

I’ve been unable to troubleshoot my three false alarms thus far. Rewired, added suppressor, ran wires alone. Replaced remote and audio batteries.

After third alarm, third main battery, I just turned the **** thing off. Next step is to replace it with something better, although maybe I’ll try your foil technique!

Lots of posts on this issue. Company no help.

Phil
RV10, flying
Salt Lake City
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  #3  
Old 01-27-2022, 03:09 PM
K=1/2mv^2 K=1/2mv^2 is offline
 
Join Date: Jan 2022
Location: Colorado Springs
Posts: 3
Default Thanks for the help

Just knowing others are having similar issues means I am not alone. We have 6 hours of run time with the Reynolds wrap and no false trips with avionics on. I color matched the Reynolds foil to RV14 for a stealthy look.

https://photos.google.com/share/AF1Q...dUY0hZSVlfMUNR

Last edited by K=1/2mv^2 : 01-27-2022 at 03:38 PM. Reason: Picture not showing
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  #4  
Old 01-27-2022, 03:48 PM
edclee edclee is offline
 
Join Date: Aug 2008
Location: Lancaster, SC
Posts: 260
Default ELT

Quote:
Originally Posted by K=1/2mv^2 View Post
Has anyone had any problems with their ACK E-04 ELT going off when the avionics is turned on? RV14a getting close to maiden flight, however the ELT unit does not like all our radios being turned on. We disconnected the remote cable and the GPS info cable, leaving the ACK E-04 ELT unit with only the coax, static suppression device, and its antenna connected, yet the ACK E-04 falsely triggers. The coax cable does not run with any other cables and has good integrity with no shorts to ground. Coax does end up going to ground at the antenna mount (by design). The closest antenna is on the bottom side about 4 feet forward of the ACK E-04 ELT. We disconnected the antenna from the coax, unit still false trips. It appears the energy from our radios is getting thru the plastic casing of the ACK E-04 ELT.

We can keep this from happening if we wrap the ACK E-04 ELT in aluminum foil. We are using the heavy-duty Reynolds wrap, aviation grade (2 layers). I would prefer a more professional solution than Reynold’s wrap. We are using the Dynon AFS AF-5600 in a dual EFIS configuration with SKYVIEW SV-COM-X25/H, Skyview SV-ADSB-472, Skyview SV-XPNDR-261, Avidyne IFD-440. We don’t even have to transmit on com to have the ELT false trip, which likely means this is triggering from the ADSB out.
Yes, I have had a similar problem although I had not proved the avionics caused it. I have had three turn-on events in the last 18 months and had conversations with Scott AFB. I will try the aircraft grade foil...is this an alien interference with out airspace???
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Sonex/Corvair 2016 Finished, Sold 2020
RV-9A 2005 Purchased
IO-320 160 hp
Exempt but happily paid for 2022
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  #5  
Old 01-27-2022, 04:31 PM
upperdeck upperdeck is offline
 
Join Date: Dec 2009
Location: Menomonee Falls, WI
Posts: 181
Default

Add me to the list. The only reason I haven't switched to another brand is because my panel is cut to accommodate this one. Junk.
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  #6  
Old 01-27-2022, 10:55 PM
fl-mike's Avatar
fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 1,690
Default

As an avionics designer, it really bothers me that Ack put out a product with ZERO radiated susceptibility testing. If you look at the install manual, there is a big x in that test category. No testing performed. My hunch is they did, and …

Unfortunately, buyers assume these things are well designed and tested because they have a TSO. Nope. I’d like to know how they jammed this through the ACO. Considering this issue affects Cospas-Sarsat readiness, the FAA should have a chat with ACK.

Your problems are almost certainly related to RF susceptibility. I assume you have the “static protector” installed.

Now you get to be the EMI engineer and figure out how to fix this with a bandaid solution.

Shopping by lowest price can be expensive.

There are some good ELT products out there. I worked with some of those guys on the ELT specification update working group.

Oh, BTW, they didn’t test for ESD either, so don’t touch those connector pins.
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Mike W
Venice, FL

N164WM RV-6A Slider/O-360/FP Sold 4/2022
N184WM (RV-8) Final stages. Titan IOX-370
N184P reserved (RV-8QB) Empennage
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  #7  
Old 01-27-2022, 11:12 PM
smt6 smt6 is offline
 
Join Date: Apr 2013
Location: SoCal
Posts: 372
Default

Search this forum and you'll see plenty of false activations reported. ACKs are junk.
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2022 Dues Paid
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  #8  
Old 01-28-2022, 05:36 AM
fixnflyguy fixnflyguy is offline
 
Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 1,536
Default Mine did it too

Mine worked fine for about 6 years, then it started tripping also. It did it more than once, sitting in the hangar with no one around and the plane unpowered. I was tracked down by a hangar neighbor who picked up the signal. I made sure to replace the "10 year" battery in the remote switch, and still had it trip in flight several times. Its now on the shelf and I replaced it with a Kannad 406 AF-Compact. I've heard success with the foil wrap solution, but I'm past that now.
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RV-4/N76WE
8A7 / Advance NC
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  #9  
Old 01-28-2022, 07:36 AM
calpilot calpilot is offline
 
Join Date: Aug 2018
Location: Independence
Posts: 230
Default

Sometimes installers use a regular phone cable instead of the supplied cable. A standard phone cable does not have "rolled pairs", the ACK does. If the pairs are not "rolled", it can trigger an activation. If this is the case, get a phone plug crimper and some plugs, cut off the existing end, and install the new end turned 180 degrees. Just a thought.....
DAR Gary
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  #10  
Old 01-28-2022, 07:52 AM
bdbeatty bdbeatty is offline
 
Join Date: Nov 2013
Location: Centennial, CO
Posts: 1
Default Same issue

My plane has been flying for 1.5yrs and I also developed false triggers. No changes (other than a brand new paint job) or issues that should have led to it. I changed batteries, checked for corrosion, and confirmed all wiring. No smoking gun. The really irritating part is my audio panel never once alerted me that the elt was triggering. I was safely back in the hangar parked and driving home an hour later when I got a call from S&R. I have basically concluded it was static electricity build-up due to a brand new paint job and the fact I fly in such dry air in winter (Colorado). I will be trying the alien aluminum foil option. Great job ACK. They were zero help btw….”there’s nothing wrong with our unit, not a single one of the hundreds sitting in the back of our shop has ever gone off!” Ok clown, great way to get to the bottom of your faulty product. Also, yes report it to your local FAA station. If they get enough calls they will force ACK to fix their S..t.

As an aside, because of this I have added to my shutdown checklist to tune to 121.5 just before shutting down my avionics. That way I can know for sure if it’s triggering while the plane is on or if is after shutdown.
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