Those of you with a Pponk that have installed a Surefly e-mag; did you need a field approval? The plane is on the AML but not the engine.

I’m curious to hear as well. I talked to Surefly earlier this week and the only thing the guy told me was that it is up to the mechanic to decide....the 470-50 is not listed as an approved engine so I’m assuming they are getting a field approval. I plan to touch base with my FSDO soon and see what their thoughts are on a field approval for it. I was hoping to find a copy of one that was previously approved.....With the 470 and 520 approved I can’t imagine it would be a big deal.

I dropped my engine off last night to be converted to a NorthPoint so I have to figure something out in a couple weeks. Hate to pay to have the mag overhauled if I can go this route

I had this done on my 1967 182 PPonk. The IA felt that it needed a field approval, even though the surefly guys felt it didn’t. There was a discussion on cessna pilots or something about this. The plane is for sale at Skywagons now if you want to cite an example to your local FSDO.

Anyways, given that the Surefly is approved on the 470 and the 520, this is a straightforward sign off.

I am finding that older IAs feel that “stacking” STCs needs specific approval for the combination of STCs, but hearing from manufacturers that the DERs and DARs don’t feel this is necessary. One DER I spoke with said that they would then have to have separate STCs for thousands of combinations. Another said that there is a lot of confusion about the rules on stacked STCs, and that per the regs this isn’t required, but some IAs get gunshy about liability.

In the end, whoever signs it back into service needs to be comfortable, so either find a IA who feels comfortable, or ask your IA to get a field approval,

Are you going to have a firewall mount battery like an Odyssey or EarthX? They are also not approved as part of the Surefly STC either.

Thanks for the info. From what I've gathered from the FAA link below, I think it would be safe for an IA to determine that the STCs are compatible and submit it on a 337. I haven't gotten the Northpoint XP470 STC paperwork yet, but I'd imagine the engine remains a 470R by type design, just modified per the STC.

https://www.faa.gov/aircraft/air_cert/d ... nation.pdf

SloRoam wrote:The plane is for sale at Skywagons now if you want to cite an example to your local FSDO.

SloRoam, have you gotten much interest in your 182? If the 182s are still bring the prices that they are listed at now, I may list mine just to see what happens...

corefile wrote:re you going to have a firewall mount battery like an Odyssey or EarthX?

No plan on a firewall battery, thanks for the heads up though

chedrick wrote:.... I haven't gotten the Northpoint XP470 STC paperwork yet, but I'd imagine the engine remains a 470R by type design, just modified per the STC. ...

I'd look closely at that.
I kinda think it is now a "470-50", not a 470R,
at least that was my take with the Pponk stc-converted engines.
For example, a 470R is approved via STC for mogas,
whereas the 470-50 is not.

chedrick wrote:Thanks for the info. From what I've gathered from the FAA link below, I think it would be safe for an IA to determine that the STCs are compatible and submit it on a 337. I haven't gotten the Northpoint XP470 STC paperwork yet, but I'd imagine the engine remains a 470R by type design, just modified per the STC.

https://www.faa.gov/aircraft/air_cert/d ... nation.pdf

SloRoam wrote:The plane is for sale at Skywagons now if you want to cite an example to your local FSDO.

SloRoam, have you gotten much interest in your 182? If the 182s are still bring the prices that they are listed at now, I may list mine just to see what happens...

corefile wrote:re you going to have a firewall mount battery like an Odyssey or EarthX?

No plan on a firewall battery, thanks for the heads up though

FWIW... the PPonk motor is no longer a 470R. The STC allows for conversion of several motors, including a U, R, 520C, F, D etc... WHen finished, it has a new designation of a 470-50. Since the engine is ostensibly a carb'd 520, and the 520 is on the AML, I would just run it...

Also, RE: the firewall batteries... I have been in communication with Surefly and I'm happy to report that they finally have worked out the language on the STC. I spoke to them the other day and the new paperwork is w/ the FAA now. The new REV will have the battery limitation changed so you can run the SBS J16 battery with no issues. Not so with the EarthX.

Hope this helps.

Greg-

Thanks for the thoughts. Ill keep digging out of curiosity. Project creep has me prioritizing my needs and wants and this may get kicked down the road 500 hours. We'll see how the prop, engine mount and exhaust turn out.

In my mind, an aircraft or powerplant has to have a TCDS (type certificate data sheet) to be certified, any modification after that is done on a STC (supplemental type certificate) which modifies an existing design. That STC would then be tied to the base engine model and S/N, be it a 470 or 520. Ill be interested to see what the STC paperwork says and may email the local FSDO to see their thoughts. I have my I/A but apparently need to brush up on some regs. I have no doubt that the Surefly would work fine, more curious how the "right" way to go about it is. I'm sure a field approval wouldn't be a big deal and nobody would ever care unless there was an accident involving faulty ignition.