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 Post subject: trying to Identify a panel Placard Cessna 172G w/ Lycon 180
PostPosted: 17 Sep 2021, 22:01 
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Joined: 08/09/08
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Location: KPWA
Aircraft: Cessna 172G
I am getting some new radios installed in my retirement a 172G w/ Lycon conversion of Lycoming O360A1A and Hartzell constant speed prop. Installing new plastic panel covers and one has a placard that reads "Avoid Continuous Operation Between 2000 and 2250 RPM"
Wondered if anyone is familiar with this Placard? Thought it might have been for the Continental O300 previously installed. I looked through the Lycoming power charts for the O360A and found no caution about this RPM zone.

Appreciate any thoughts on the subject, posted on Cessna Pilots Association but not many readers left on that forum now I suppose and no help.


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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 17 Sep 2021, 22:40 
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I believe some installations of 180 have rom restriction. Check Airplains website.

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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 17 Sep 2021, 22:47 
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https://www.supercub.org/forum/archive/ ... 36800.html

Looks like it is not unique to 172. It looks like a prop/engine combo.

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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 17 Sep 2021, 23:47 
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Location: KPWA
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Thanks for the replies, great to have the resources to answer my questions. I was able to find the STC on line and sure enough it is a required Placard of the STC. Questions resolved, Placard goes back on.


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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 17 Sep 2021, 23:52 
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Joined: 04/18/10
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Have similar placard on my Alcon conversion 180/csp. I think it might be an engine/prop restriction as well, not just for Alcon conversions.


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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 18 Sep 2021, 00:27 
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Joined: 02/16/09
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Company: Cardinal Flyers
Location: Berkeley, CA
Aircraft: Turbo Cardinal RG
Username Protected wrote:
"Avoid Continuous Operation Between 2000 and 2250 RPM"

I had a similar placard on my 200 HP Lycoming IO360A Cardinal... installed the Hartzell scimitar composite prop, and voila, no more placard. Only cost $15,000 to get rid of that placard...
The composite scimitar prop climbs about 100 FPM better, and cruises a couple knots faster. And it moves 20 pounds off the nose, which is important for nose-heavy turbo Cardinals. So there were other advantages, besides removing the placard.

Paul


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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 18 Sep 2021, 08:34 
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Joined: 01/23/13
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Company: Kokotele Guitar Works
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Aircraft: C-182RG, C-172, PA28
20 years ago, CAP upgraded a lot of its 172Ps with the Air Planes STC, and I flew several of them. None had placard. I wonder if our shop made a mistake or if that’s new. Continuous operation at 2000 RPM was a common occurrence.


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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 18 Sep 2021, 10:52 
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Did Air Plains have a Hartzell CSP prop?


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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 18 Sep 2021, 11:32 
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CAP's were all fixed pitch, can't remember what prop it was. That must be the difference.


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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 27 Sep 2021, 10:19 
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I've seen this placard on several different aircraft with IO-360's and constant speed props. It has to do with harmonics between the engine and prop in that rpm range. Mooney M20's in particular come to mind.

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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 27 Sep 2021, 11:48 
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I've seen similar restrictions in numerous (I)O-360 PLUS 2-blade constant speed prop equipped aircraft.


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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 27 Sep 2021, 13:04 
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Joined: 11/08/12
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Location: Jackson, MS (KHKS)
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Username Protected wrote:
posted on Cessna Pilots Association but not many readers left on that forum now I suppose and no help.


There was a schism 10 or so years back and a number of people left for cessna-pilots.net

IDK how that looks now, but might try there for future reference.


Last edited on 27 Sep 2021, 16:30, edited 1 time in total.

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 Post subject: Re: trying to Identify a panel Placard Cessna 172G w/ Lycon
PostPosted: 27 Sep 2021, 14:40 
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Chuck

I was an owner of a 172G with an 0-300. No such placard was on my plane nor was that rpm range advised against in the owners manual.


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