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182 though 182D CHT probe location

Y

YJLopes

Registered User
Aurora. Colorado
What cylinder does it go on? I can't find anything in the TCDS or the service manual that says where the CHT probe should be on the early 182s, specifically the 182 through the 182D.

Any ideas??? Looking for a reference to a Cessna or TCM manual.

I have learned that on the 57-58 182B the CHT gauge was "optional".
 
T.C. 3A13 Page 31 NOTE3.
https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/666f7c0610115b688625871e005fa181/$FILE/3A13_Rev73.pdf
 
skywagon8a said:
T.C. 3A13 Page 31 NOTE3.
https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/666f7c0610115b688625871e005fa181/$FILE/3A13_Rev73.pdf
Click to expand...

That doesn't reference anything older than a 1970 'N' model. Looking for info on the 56-61 models, 182 through the 182D.
 
The early 180 and 182 were the same except for the landing gear. If you can not find anything else, it would be safe to use this: TC 5A6 page 24 NOTE: 4. The #2 cylinder.
https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/666f7c0610115b688625871e005fa181/$FILE/3A13_Rev73.pdf
 
skywagon8a said:
The early 180 and 182 were the same except for the landing gear. If you can not find anything else, it would be safe to use this: TC 5A6 page 24 NOTE: 4. The #2 cylinder.
https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/666f7c0610115b688625871e005fa181/$FILE/3A13_Rev73.pdf
Click to expand...

I need something in a manual or other written guidance from Cessna. I am working on an STC for engine cooling on 180s, early 182's, and 185s, and the FAA is asking questions about this that I haven't been able to find an answer for.
 
Now I'm beginning to understand what you need. If whatever you are working on is something which will effect cooling, it has been my experience with the FAA in performing flight tests that they require thermocouples on all of the cylinders. This in order to make a determination of the effects of the alteration.

I have a hard copy of TC 3A13 Rev 39 dated March 16,1982. The only reference to CHT installation begins with the 182N. I can only conclude by this that the CHT instruments were not required on the earlier models as they are not called for in the TC.

The only other suggestion I have would be to look in the appropriate parts manual. I don't have one.
 
skywagon8a said:
Now I'm beginning to understand what you need. If whatever you are working on is something which will effect cooling, it has been my experience with the FAA in performing flight tests that they require thermocouples on all of the cylinders. This in order to make a determination of the effects of the alteration.

I have a hard copy of TC 3A13 Rev 39 dated March 16,1982. The only reference to CHT installation begins with the 182N. I can only conclude by this that the CHT instruments were not required on the earlier models as they are not called for in the TC.

The only other suggestion I have would be to look in the appropriate parts manual. I don't have one.
Click to expand...

We will be monitoring all 6 cylinders for the flight test, the question is, are we using an airplane that is representative of all of the airplanes on the proposed AML. On the 180 and 185, the single probe moved from 2 to 1 to 3 over the years. I'm trying to figure out where it was installed on the 182s and if it was always there or moved like the 180/185.
 
I have the parts books, send me a PM and I can send you the page.
I'm not good at managing images and posting. I think there are some issues about publishing the pages in a public manner too in our user license.

Ken
 

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They don't specify in the parts books but seem to refer to cylinder #2 in diagram. I checked a 182C that stopped in for a rough mag, it is in #2 but who knows when or who installed it. Likely original as it is an old plug gasket AN thermocouple unit with a 3-1/8 indicator. My recollection is that later models installed the probe in #3.
The only thing that makes me question the unit in the 182C is that there are no range markings on it, don't now if they marked the old units or not as they don't appear to be required equipment. I would think that accurate measurements by current meters would satisfy the need as limits are limits and all cylinders would be monitored. If all are monitored the question should be answered, but that applies logic that they might not accept.
Ken
 
This is from the C-182 TCDS. Like Pete points out, no mention of CHT until 182N and no location given in O-470L & R TCDS.

Web
 

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A thought about those earlier models on which CHT probes are not mentioned in the TC. If during flight test Cessna found that none of the cylinders would exceed Continental's limits, there would be no requirement for a CHT instrument since there would never be an exceedance. If Cessna could prove the engine would never exceed the limits, then FAA would not require the instrument. Any CHT installation on those models would be strictly an owner option. This appears to be the case when reading the TC.
 
More info. The thermocouple is part #0311018-11. The parts index in the back sends you to figures 75, 76, and 77. #77 item 24 is the part, shown on cylinder #2 on all models of 182s covered by this manual.

This is what I do on an early Saturday morning when I can’t sleep. :)
 

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