CS Prop line

DonPro · #1 10-04-2006, 05:40 PM

Is aluminum too weak for the governor to prop line? I know stainless is the norm. Is stainless readily available to buy and bend or where is the best place to get a pre-made line?

Thanks,
Don

Indigo · #2 10-04-2006, 05:55 PM

You can get the line made by Lycoming and will also need some other parts, here is a list of what you will need. The line is already bent to form around the engine and works well and it is stainless.

1 each 75167 Prop gove line
1 each 75165 bracket
1 each STD-1930 hose
1 each LW or SL31-0.94 bolt

az_gila · #3 10-04-2006, 06:20 PM

This was also the subject of an AD. Aluminum lines must be replaced with SS, and the mounting points for the SS hard line are specifically noted.

An acceptable alternative on the AD was a flexible hose. This might be the easier way to go if you don't have the SS Lycoming parts....

gil in Tucson

Low Pass · #4 10-04-2006, 08:31 PM

Buy the Lycoming part, new. This is a very high criticality part. Spring a leak, or worse, split the line, and you'll be landing in a couple of minutes *or* possibly have an engine compartment fire.The flex hose might be a viable option, but the clearance at the front bearing is tight. Not sure how easily it would work. I have the stainless.

osxuser · #5 10-04-2006, 09:31 PM

Remember that you have a ton of pressure running through that line. And it'll pump a ton of oil out in a hurry. Stainless by AD, and steel fittings in the engine. Accept no substitutes, I don't even like the hose option if I could choose.

RV8N · #6 10-05-2006, 07:45 AM

I'm afraid I disagree. The hose is a viable option. Your looking at about 60-80 psi of oil. An Aeroquip steel braided hose is serious overkill here. You use them on your oil cooler and remote mounted oil filter (if installed). Some people even mount their oil cooler up front and run hoses above or below the cylinders. Why wouldn't a hose be acceptable for the prop governor?

I had no doubts when I went with the Aeroquip hose. My engine was not set up for constant speed prop. I had to purchase a governor mount but couldn't find the lyc. tubing without paying Lycoming a king's ransom. I ran the hose under the right cylinders and up thru the front baffle piece, just like the lyc tube would be run. Also used two Adel clamps to some of the sump bolts. Works great.

Karl

RV6_flyer · #7 10-05-2006, 11:38 AM

I had a Custom made Aeroquip Teflon Stainless Braid hose made for my engine 10 years ago. The one I have is a PMA part rated at 3,000 PSI. I could have got one for $4 less that was only 1,500 PSI rated. 10 years go, the hose cost $54 and they made it while I waited. I took them a mock up that was the length I wanted.

At the time, I could purchase both the Rigid Stainless or the Teflon Braided hose with firesleave from Lycoming at a much higher price. I had a custom made rigid stainless line that was made for me by a friend. I when with the Teflon hose and gave the Rigid line to another RV builder and he is flying with it.

After 1,953 hours of flying over 9 years, the 3,000 PSI rated Aeroquip Teflon hose is still working.

mahlon_r · #8 10-05-2006, 12:09 PM

Using an appropriate hose in lieu of the stainless steel rigid line is approved by Lycoming and the FAA.
See for more information:
http://www.airweb.faa.gov/Regulatory...light=lycoming
Good Luck,
Mahlon
"The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at you own risk."

N941WR · #9 10-10-2006, 07:59 PM

A friend was flying his Cardinal one evening, just after sunset, when the forward fitting on the prop line broke (pre-AD aluminum fitting?). Lucky for him he just passed a small country airport and the landing lights happened to be on. He descended, turned base, final, and landed. Rolled off on to a taxi way and shut down.

I can still remember him commenting on pulling that plane up hill by hand to the tie down area and being thankful he was able to do that.

In the morning when we went to inspect the plane he found there was a bit over two quarts of oil left so the engine was fine. Total time between him being aware of the problem and getting it on the ground was less than five minutes but it must have seemed like an hour as the windscreen was COVERED with oil.

Moral of the story, use quality parts for your prop lines.

frankh · #10 10-10-2006, 08:50 PM

to get a hose is to go down to your local hydraulics shoppe.

You will get a teflon hose with steel fittings for about $3.30 a foot plus the fittings they will swage on the end.

MUCH cheaper than "proper" aircraft parts and just as good.

They also sell the 1/4" nylon brake line tubing too...

Frank