Hello all, I have a 54' B model that I am getting ready to put a heated pitot tube on. I have the tube, mast, etc. just not that paper work to know where to install it. I have seen others with heated pitot tubes and as far as I know they never left the factory equipped like that.
Can anyone help me with getting a fax or whatever of the paper work that states how and were to install the mast. I have looked at early model 172's and have a rough sketch as to where it looks like it goes but my mechanic what's to see it in witting since it could change stall speed, etc.
I apologize ahead of time if there is a previous post about this, I couldn't find a way to search through past post and don't have the time to flip through 22 pages!
If you use the "Search" function (available at the top of every page on the forum) you'll find the following link as well as some others that will probably answer your question.
Like lowNslow says it is pretty well discussed at that link. You probably don't want Cessna drawing 0511051 as that is the straight out of the wing older style. I have a copy of AK175-23D accessory kit paper work I received by the graciousness of Jatkins. My PMI had no problem approving a 337 using that as a basis since the early 172 and the 170B are "basicly" the same airplane. Let me know if you would like a copy. Brian
Looks like you are getting some feedback on paperwork. If you need more I can fax you what I have.
I had heated pitot installed years ago and it is the right thing to do.
We would like to share an experience with you.
I check the heated pitot in preflight during the cold winter months.
During one preflight I was showing a lovely young lady what a pilot does prior to take off. Talking too much and taking too long. Worked my way all around the plane and reached up and grabbed the pitot tube with all
fingers wrapped around the tube. OUCH! I was literally burned, part of my hand looked liked bacon. How hot does it get in 10 minutes ?
I was thinking warm and it was like meeting your hot soldering iron on a work bench. It is still a little embrassing to relate this incident.
Just informational: Some mechanic/shops are under the mistaken impression that a 170 must have a heated pitot in order to be certified IFR. NOT SO. There is no requirement for heated pitot for IFR. Not even for airplanes flown at/above freezing levels.
Required equipment for U.S. Certificated airplanes (FAR 91.205) may be found at:
'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.
I want the heated tube not because of the heat but because of the drain hole. Ever flown way too much time in rain only to have the pitot line fill with water? I had to pull mine out from under the dash one time to drain!
Probably due more to condensation than ingested water. The non-heated tube runs uphill before it enters the wing. Water ingestion is usually indicated by a jumpy needle which goes away after the flight when the water drains back out the opening. Remember, no actual exchange of air occurs in a properly sealed system....only air pressure is measured...so water doesn't migrate towards the instrument or into the cockpit area unless you have a pitot system leak, or (more likely) an instrument capsul leak.
If you consistently get condensation, you might wish to install a sump-jar instead, similar to later 172 installations.
'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.
