180 horse conversion

180 horse conversion

I recently purchased a 1971 172 with the 180 horse constant prop conversion, the stc and supplement were missing. I will pay dearly for a copy of this paperwork.
I am also looking for the stc to increase max weight to 2550.

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Re: 180 horse conversion

Doug,

You need to let us know which STC your conversion was performed under.

Penn Yan, Del-Air, Daycon, KWAD, the Williams in Udall, KS (Avcon), and probably several more companies have STCs for O-360 180 HP engines with constant speed props for 172s.

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Re: 180 horse conversion

IS there a stc to increase your husky'w weight to 2550Lbs.  What does one need to do or pay?  Sounds like a great STC to me.

Mike

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Re: 180 horse conversion

Stan, Why won't they give an increase gross with the older models, (eg.b models). I did the conversion and still have to fly with a 2200lbs max. We all know it will do way better. Is there a way to get the increase?
Rick.

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Re: 180 horse conversion

> Stan, Why won't they give an increase gross with the older models, (eg.b models).

I don't have an answer. AirPlains has said they're working on a gross weight increase for the earlier 172s, but I'm not sure it's a high priority project for them. I don't know if there are significant differences in the airframe structures between the earlier and later airplanes, but I don't believe so.

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Re: 180 horse conversion

I'm betting that it has a lot to do with the 40degree flap travel

Tony
C-GICE

Stan Cooper wrote:

> > Stan, Why won't they give an increase gross with the older
> models, (eg.b models).
>
> I don't have an answer. AirPlains has said they're working on a
> gross weight increase for the earlier 172s, but I'm not sure
> it's a high priority project for them. I don't know if there
> are significant differences in the airframe structures between
> the earlier and later airplanes, but I don't believe so.
>
>

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Re: 180 horse conversion

> I'm betting that it has a lot to do with the 40degree flap travel...

Tony, one of my co-workers installed the Air Plains O-360 in his '77 172N and got the 250 pound gross weight increase STC at the same time. They did reduce his flap deployment from 40 degrees to 30 degrees and installed 6-ply tires, so I'm sure the flap travel would have to be limited to 30 degrees on the older airplanes, too.

If the 40 degrees of flaps is really the reason they don't offer the gross weight increase on the older airplanes, I don't understand why they couldn't mechanically limit the flap extension to 30 degrees on them just like they did on my friend's '77.

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Re: 180 horse conversion

I have a 1957 C172 with the O-300. Who has the STC for the older model 172's?

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Re: 180 horse conversion

>  I have a 1957 C172 with the O-300. Who has the STC for the older model 172's?

Del-Air in Porterville, CA.

STCNumber: SA00461SE
Manufacturer: CESSNA
MakeModel: 172, 172A, 172B, 172C, 172D, 172E, 172F (USAF T-41A), 172G, 172H (USAF T-41A)
TCNumber: 3A12
Description: Install a Lycoming O-360 series engine and Hartzell, McCauley, or Sensenich propeller (See STC for specifications).
Status: Amended 8/7/98
ACO NM-L
STCHolder: Harry R. Dellicker
Del-Air
2121 S. Wildcat Way
Porterville CALIFORNIA 93257 UNITED STATES
Phone: (559) 784-9440

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Re: 180 horse conversion

Thanks, you're a wealth of knowledge. I really appreciate it. Just joined the organization yesterday and I think I like it.
Dale

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Re: 180 horse conversion

BushConversions in Udall kns. also has an STC for the earlier models.

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Re: 180 horse conversion

What is the total cost for the conversion and which company can do that?

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Re: 180 horse conversion

I have a 1974 Cessna 172M that has an AVCON Lycoming O-360 that was installed in 1977.  I'd like to purchase the STC that allows the increased gross weight.  Anybody know how I can find out where to get it?

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Re: 180 horse conversion

Dale Rabeneau Wrote:
-------------------------------------------------------
> Thanks, you're a wealth of knowledge. I really
> appreciate it. Just joined the organization
> yesterday and I think I like it.
> Dale


I'm trying to find out how I can "buy into" the STC that allows increased gross weight on my 1974 C-172M with a 180HP Avco/Lycoming engine.  It was installed in 1976, but no IGW came with it.  Any ideas out there where I can go to get this STC to apply to my airplane?  I'm more than willing to restrict the flaps to 30 if that's what it takes.

Bob Kay

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Re: 180 horse conversion

I bought a 1961 skylark 175-B with the G0-300 replaced with the 180hp lycoming back in 1979. I need to find information on what my gross carry weight is now and how does this affect the weights and balance chart in my owners book? My plane also has the extended range tanks at 52 gallons and a constant speed prop. Any guidance would be gratefully appreciated! Also.. I need to find a POH book for my aircraft

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Re: 180 horse conversion

I have a 1954 170B Iam Looking for options on a 180hp conversion STC's and any comments from previous owners who converted there 170 to a 180hp

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Re: 180 horse conversion

I have a 1977 172 n model  with a penn yann  fixed pitch prop conversion. I currently  trying to finish up my privily exam. I had trouble with the  examiner because I was  using the published V speeds from the owners Manuel. Is there  supplement or something  I can get a copy for the correct V speeds for this conversion. or a copy of the v speeds for the new 172 /180
Thanks Carl
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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Re: 180 horse conversion

I purchased a 172K with the Avcon conversion to 180 horsepower engine.  Do you know what an increased gross weight STC would cost?

Thanks,

Tim Wiens

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Re: 180 horse conversion

Last year I purchased a 1965 172F that had the AVCON 180hp conversion done sometime in the 70's.  In 2003, when the first engine was at TBO, it was removed and a Lycoming factory reman engine was installed. A few weeks ago while performing the first oil change since my purchase I realized that there are no primer lines or nipple fittings on the engine.  The lines from the primer knob come through the firewall and hang down (disconnected) from the gascolator which is plugged where the primer draw line would connect.

As far as I can tell this does not seem to be part of the STC and the primer is not placarded as "inop."  To date I can get no response from AVCON to ask them if this is per the STC.  Does anyone know anything about this?  The plane had been through an annual every year since 2003 and had a fresh annual when I purchased it.  If there is a problem is it with A&P who performed the annuals or with the installer of the engine in 2003 or both?  Finally, how can I cheaply fix the situation and install primer lines and fittings?

Thanks,
Bryan

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Re: 180 horse conversion

I'm not sure that the increase in gross weight was part of the Avcon conversion.  For the Bush conversion that has a fixed pitch prop, I believe that to quallify for the gross weight increase the flaps had to be mechanically limited to 30 degrees and you had to use different tires (6-ply?)

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Re: 180 horse conversion

Dear Sir,

I am searching the STC for 180 HP conversion.
I have a Cessna 172P and Lycoming O-360-A4A and Sensenich 74EM8S5-0-60.

Please let me know the STC number.

best regards,

Aiichiro NAKAZAWA

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Re: 180 horse conversion

I own STC SA564NE that is certified on the Cessna 172P with a Lycoming O-360-A4N and a Sensenich 76EM8S14-0-60.  I think that the only difference between the 76EM8S5-0-60 & the 76EM8S14-0-60 is the length of the spacer behind the propeller.  You can e-mail me directly if you need additional information if this helps you out.

Joe's Aircraft Mods LLC

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Re: 180 horse conversion

Carl Black Wrote:
-------------------------------------------------------
> I have a 1977 172 n model  with a penn yann  fixed
> pitch prop conversion. I currently  trying to
> finish up my privily exam. I had trouble with the
> examiner because I was  using the published V
> speeds from the owners Manuel. Is there
> supplement or something  I can get a copy for the
> correct V speeds for this conversion. or a copy of
> the v speeds for the new 172 /180
> Thanks Carl
> This e-mail address is being protected from spambots. You need JavaScript enabled to view it


I have exactly the same model and conversion- 172N Penn Yan converted in 1991. Just bought it and, while waiting for the log material to arrive, had been told by Penn Yan to expect that information to be in the STC in the Technical Log. No sign of it there, and the more I nose around, the more I wonder if it's really out there at all! The POH supplements just say no change to performance section.

Penn Yan said generally to add 10 knots to the performance speeds in the POH for TAS in cruise, and expect to burn about 10.5 gph at 75% power. That's helpful , but somebody must have done the TAS and GPH numbers at some point for various cruise power levels at various temperatures (or even just at standard temp!), takeoff and landing distances (or even just takeoff distances!), and rates of climb with the beefed up engine.

I found a NTSB report from 1994 where a pilot ran out of fuel using the standard POH data with a 180 conversion. The report recommended that the STC be amended to include appropriate data, but the STC copy that I have doesn't include it.

I did find (via Google) a flight manual supplement for a 180hp conversion on a C172P model done by Air Plains Services Corporation- maybe helpful but not directly relevant.

Even if I find these numbers for the 172N on wheels, I will also need to find the numbers applicable to the plane on Baumann 2550 Floats for the Spring, so if anybody has anything on that, I'd appreciate it as well.

Any comments out there??

Thanks!

Ron Marshall

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Re: 180 horse conversion

Hi Ron,

I have a '77N model with the 180hp conversion by Air Plains.  I live 45 min from Penn Yan but, after a great deal of research, I chose the AP STC.  It did come with supplemental flight manual information including V speeds, fuel burn and all of the graphs and charts you would normally find in a POH.  I don't know about Penn Yan's version but I can't imagine that there would be nothing to address this as the performance of the aircraft changes quite a bit!

It wouldn't be legal but I can list what my new speeds are, if it would help.

Gary

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Re: 180 horse conversion

I have a 1966 172G with a Lycoming O 360 A1A, Constant Speed Prop, I think it is a BUSH Conversion, does anyone have the STC number the FAA says this not an authorized conversion. Thanks

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