Zeftronics Regulator Approval (sp)

How to keep the Cessna 170 flying and airworthy.

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GAHorn
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Re: Zeftronics Regulator Approval (sp)

Post by GAHorn »

I see your point. 8O I've personally never seen one with a cover which attached in that fashion, yet it's clearly marked with a DR pn.
'53 B-model N146YS SN:25713
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flyboy122
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Re: Zeftronics Regulator Approval (sp)

Post by flyboy122 »

nippaero wrote:
Thanks for explaining the 337 process. I thought the local FSDO used to approve the 337's and now they are all mailed to OK City? I wonder how long that approval process takes?
Well....technically the FSDO doesn't approve the 337, they approve the data. As explained above, the FSDO is 1 source (of I think 4....FSDO, AC43, STC, or DER I believe) for approved data. Then the IA verifies it was installed per the approved data. Someone can correct me if I'm wrong, but I believe the FAA announced a policy change a few years ago that they no longer review the 337's at Oke City.

DEM
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Mschwarzkopf
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Re: Zeftronics Regulator Approval (sp)

Post by Mschwarzkopf »

Thread bump...

Has anybody had any luck, or trouble, getting approval for the Zeftronics G1200N 20A regulator since the 170 series is not on the aircraft eligibility list?

It turns out I’ve got a 20A generator (p/n 1101890) with a 12A regulator (p/n 1118383)... bummer.

Mike
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Re: Zeftronics Regulator Approval (sp)

Post by GAHorn »

MIke, you might call Zeftronics (Hazotronics) direct over in Longview, TX. Their chief engineer, Dr. Femi Ibitayo is very helpful and knowlegeable and might have some updated info. (Dr. Ibitayo supports missionary work in West Africa with profits from his business.)

(903) 758-6661

ECSS@zeftronics.com
'53 B-model N146YS SN:25713
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An originality nut (mostly) for the right reasons. ;)
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Mschwarzkopf
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Re: Zeftronics Regulator Approval (sp)

Post by Mschwarzkopf »

That’s my plan George; to give them a call sometime this week. I was hoping somebody may have traveled this path already. I’ll pass along what I hear.
Mike Schwarzkopf
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Re: Zeftronics Regulator Approval (sp)

Post by goodair »

I know this is an old post, but I am currently doing this exact same thing with the Zeftronics. Can anyone update this thread? Was your installation successful? I spoke with Zeftronics yesterday and as of 12/22/2018 they still dont have the G1200N approved for the 20amp installation on the 170. Any updates?
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GAHorn
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Re: Zeftronics Regulator Approval (sp)

Post by GAHorn »

The 20A set-up is not the most common so this problem is not likely in the "front runner" list. You might be the best person to "update" matters with whatever approval basis Zeftronics offers.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons. ;)
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Mschwarzkopf
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Re: Zeftronics Regulator Approval (sp)

Post by Mschwarzkopf »

The gentleman from Zeftronics told me the same thing back in February; that I would have to go about approval for the 20A regulator on my own. I never did follow up. Since then I’ve hemmed and hawed about putting in an alternator, but then that leads to a myriad of other mods that I just don’t have the time for right now (new wiring, ammeter, interference with F&M oil adapter). Oh yeah, then there’s that ADS-B thing ($$$).

So, I’m still debating what to do with my 20A generator and 12A regulator setup.

If you’d like to coordinate together to convince Zeftronics to get approval on their side, I’d be happy to join in the effort.
Mike Schwarzkopf
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Bruce Fenstermacher
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Re: Zeftronics Regulator Approval (sp)

Post by Bruce Fenstermacher »

Folks here is the I way I see it.

Part 0413205-5 is the Cessna regulator called for in the B Model IPC for a 20 amp Delco Generator. 0413205-5 is Delco Remy part 1118736

The Zeftronics G1200N is PMA'd to replace a Delco Remy 1118736.

That is as far as I'd look. There is no STC required. Your replacing a part with a PMA'd replacement part.

BTW, I checked today. My 35 amp generator equipped 170 has been working very nicely with a 30amp range amp meeter. In actual operation the amp meter rarely, and then only momentarily, reads more that -5 or +5 amps. This at 2400 rpm with my landing lights, nav lights, strobe lights and radios on. Battery is charged. Now I'm sure if I pulled it to an idle I would see -20 amps, 5 amps for each of those 4 systems but I didn't think to test this.
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goodair
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Re: Zeftronics Regulator Approval (sp)

Post by goodair »

"Part 0413205-5 is the Cessna regulator called for in the B Model IPC for a 20 amp Delco Generator. 0413205-5 is Delco Remy part 1118736

The Zeftronics G1200N is PMA'd to replace a Delco Remy 1118736."

This is PERFECT. Exactly what I was looking for. The gentleman at Zeftronics hinted at this method of approval, but I believe they would like their item to be specifically listed for the type. I do believe that the interpretation listed above would be adequate for most purposes....

Thanks for the posting
Neal
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toms170b
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Re: Zeftronics Regulator Approval (sp)

Post by toms170b »

I am updating this based on further discussion with my A&P.

I am in the same situation as others on this old thread. Installed Delco Remy generator is P/N 1101890, 12V, 20 amp generator. Per Zeftronics technical data provided with voltage controller, "Delco-Remy Generator Spec Data & Zeftronics GCUs Sheet page 1of 2", the correct Generator Control is G1200N. However, "Aircraft Model Eligibility Sheet" also provided with Zeftronics controller the Cessna 170B is not listed for the G1200N.

The original generator provided with my 1954 C170B aircraft as an option from the factory was Delco Remy P/N 1101876 12V 12A generator. The part was obsoleted by Delco Remy and superceded by P/N 1101890 20A generator. At some point in time during a generator overhaul or replacement, the 1101876 core was replaced with the 1101890.Continental Overhaul Manual for the C145 Engine also lists P/N 1101890 as the correct generator.So the installed generator is correct for the engine and aircraft make and model .

However,the Delco Remy voltage regulator that came with the aircraft was P/N 1118383 limits output to 12A. The 170B generator is fused for 20A and the wiring is adequate so there are no issues in practice. So it is really just a technicality in the paperwork. The PMA for the Zeftronics G1200N 20A voltage controller is a replacement for the Delco Remy 1118736 20A voltage regulator. The Zeftronics G1120N 12A is the PMA replacement for the Delco Remy 1118383 12A.

As Mr. Fenstermacher states in the thread the Illustrated parts catalog also lists the 20A voltage regulator, Cessna P/N 0413205-5 which is Delco Remy 1118736. I cannot actually find this cross reference to document this to my A&P, so if someone has this it would be appreciated.

My A&P still has a concern because of the aircraft eligibility list and plans on submitting the paperwork to the local FSDO for clarification. But at least if I can prove that Cessna P/N 0413205-5 is Delco Remy 1118736 we are not going to limit the generator to 12A with the G1120N.

Thanks
Tom
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GAHorn
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Re: Zeftronics Regulator Approval (sp)

Post by GAHorn »

The 0413205-5 has been superceded by Cessna to VR-300-14-20 which is indeed the Delco Remy PN.
Keep in mind that the Cessna IPC is not an approved document when using it to confirm approval basis.
'53 B-model N146YS SN:25713
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An originality nut (mostly) for the right reasons. ;)
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n2582d
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Re: Zeftronics Regulator Approval (sp)

Post by n2582d »

I agree with George here. If you look at Cessnaparts.com you can follow the progression of superseded part numbers from 0413205-5 to 0413205-12 to VR300-14-20. VR300-14-20 is an Electrodelta part number. I'd be remiss not to include an ancient Service Newsletter on the subject. :D Here's SNL 5-21-52:
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GAHorn
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Re: Zeftronics Regulator Approval (sp)

Post by GAHorn »

Electrodelta is a direct Delco-Remy replacement.
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An originality nut (mostly) for the right reasons. ;)
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Re: Zeftronics Regulator Approval (sp)

Post by Bruce Fenstermacher »

So a 170B with a 20 amp generator can legally have a 20 amp regulator. We've just shown all the legal provenance.

The Zeftronics G1200N is a PMA'd replacement for 0413205-5 though the 170B is not listed on the aircraft eligibility list. BTW we where talking their 12 or 25 amp version it is approved and the 170B is listed. This should be a fairly easy 337 to get approved.
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