406 elt

04-24-2011, 10:02 AM

Robehouse | 406 elt

Finally received my ACK E-4 retro kit from Air Spruce ordered 2 years ago..$545. I'll install it next week and post any issues.


04-24-2011, 03:43 PM


I would like to hear how you make out.......

04-26-2011, 01:28 PM


The installation was fairly straightforward. Remove the E-1 and replace it with the E-4 (simple plug-in). They provided a replacement ‘cockpit remote’ that seems to be identical to the original except for the placard which includes the label “406’ however mine was 11 years old so I replaced it anyway. Although the system will function ‘stand alone’ they also provide a way to interface with your GPS. This allows for a ‘possible’ quicker response in an emergency (10minutes vs. 2hrs) ???. ACK Site : ackavionics.com.

Hope this helps.


04-26-2011, 05:27 PM



where did you locate the antenna - right on the unit? is there a test feature to sample the reception quality?

04-27-2011, 03:05 PM


The new antenna is installed in the same location of the original antenna, which, in my airplane is mounted inside the vertical tail right skin. Also there is a wire for testing GPS signal strength assuming you take advantage of the GPS hookup feature (my avionics guy will be doing that portion of the installation). JR

06-27-2011, 11:27 AM


Anyone know if a 337 Form is required for a 406 MHz ELT installation? My A&P/IA says he strongly believes one is REQUIRED, but his experience is almost exclusively with certified aircraft, not experimental. Anyone with knowledge on the matter please respond.

06-27-2011, 02:36 PM

Ed Lynch | Form 337 for Experimental Aircraft

According to FAR Part 43, Sec 43.1 (b), FAR Part 43 "... does not apply to any aircraft for which the FAA has issued an experimental certificate, unless the FAA has previously issued a different kind of airworthiness certificate for that aircraft." Ed

06-27-2011, 09:20 PM


Thanks Ed!

Sec B seems clear except for the part "unless the FAA has previously issued a different kind of airworthiness certificate for that aircraft." As far as I know my Seawind has only been issued it's current Special Airworthiness Certificate, but if it - the FAA- had, how would one know?

06-28-2011, 06:44 AM


Try here....


06-30-2011, 08:38 PM

Ed Lynch | FAR Part 43

There are planes registered EXP that were originally built for, and issued standard airworthiness certificates. One of them is based here at Spruce Creek- a Bonanza that was converted by its owner to an Alison 420 engine (a propjet), and was then re-registered as an EXP. So this guy has to comply with part 43 maintenance procedures on the airplane. No kit built Seawind could ever be issued a standard airworthiness certificate , as far as I know. Ed

06-30-2011, 09:41 PM


Thanks Ed! Makes sense - but would have never guessed. I thought (assumed) that the JetBonanza operated with an STC for the turbine... but maintained it's Certified certificate. But what you say makes sense.