The International Cessna^® 170 Association

Trying to find out if the stc # 106 is the correct one for a '48 C170 with metalized wings. I would like to replace the inoperative grimes units. Also, the fuel cap for the r/h tank came from a C195 or something according to the previous owner. It is about 4" in diameter and has a bar in the center that you twist 90 degrees to lock it down. Pretty sure it is not original. Leaks like crazy. Is there a source for the original type, satisfactory replacement etc., and if the tank is vented does the fuel cap require a vent ? Thanks

On the fuel cap, replace the oring on the center bolt and should solve the leak. If outer gasket is leaking, automotive store should have large flat gaskets for fuel filter cans that will work.

John

I have the leading edge landing light installed on my '48 (installed when they metalized the wing in 1961), and have the 337 for it in front of me.

It refers to it as 'Skycraft Designs, Inc Supplementary Type Certificate SA1-647'

As for the fuel tank caps, both of mine are exactly what you describe - I never thought of them as non-original, but I haven't looked at alot of other '48s to compare. My left one leaks, but the right one seems to hold up just fine.

Here is a copy of the STC for the '48 posted on another thread here:

http://www.cessna170.org/forums/downloa ... &mode=view

Thanks for the replies and info.

Does it cover -A and -B's?? It would be a good one for an extra light on the other wing!

Hi folks,
I understand that I must get hold of the people that was issued the stc and buy the rights from them. In the case of the landing light in the leading edge it seems that the certificate was issued to Skycraft Corp of Medford, MA. Cant seem to find them on the internet. There was one number listed in a different state but had been disconnected. Anyone know how to proceed in trying to get the stc ?

dpowell wrote:Hi folks,
I understand that I must get hold of the people that was issued the stc and buy the rights from them. In the case of the landing light in the leading edge it seems that the certificate was issued to Skycraft Corp of Medford, MA. Cant seem to find them on the internet. There was one number listed in a different state but had been disconnected. Anyone know how to proceed in trying to get the stc ?

AFAIK, Skycraft doesn't exist anymore.....one of the reasons that no one can find good documentation on the metalized wing conversions.

Hopefully George or someone will come along with a recommendation on how to get a current STC, if it is even possible.

If you can't find the owner, you can't get an STC, ever. It is that simple. In fact the FAA won't even give you any information, like installation drawings for continued airworthiness that they might have.

This is one of the problems with STC's and for aging aircraft it is a growing problem.

The next problem is the FAA won't recognize the STC owner is non existent and therefor the STC not supported and unobtainable. If you were to ask for a one time modification approval for the same modification, they won't approve it, instead telling you to buy the STC, that you can't buy.

Bruce Fenstermacher wrote:If you can't find the owner, you can't get an STC, ever. It is that simple. In fact the FAA won't even give you any information, like installation drawings for continued airworthiness that they might have.

This is one of the problems with STC's and for aging aircraft it is a growing problem.

The next problem is the FAA won't recognize the STC owner is non existent and therefor the STC not supported and unobtainable. If you were to ask for a one time modification approval for the same modification, they won't approve it, instead telling you to buy the STC, that you can't buy.

Makes sense, in a legal sort of way. The FAA can't give away a person's private property, and it's awfully hard to prove the nonexistence of something (e.g. a will somewhere, conferring ownership of the STC to persons unknown). That's where type clubs can really help, by accepting donations of STCs from their holders. Even then, some of them are bound to get lost. I don't know the answer to this very real problem.

Yes John in a legal sort of way it is a problem and I didn't think the FAA should just give out the STC. However there is a point if there is no declared ownership that I think think the info should be released. Kind of like our airplane registration, there should be mandatory reregistration to retain ownership of STCs. If one can't bother to claim ownership, just like our airplanes registration, it is lost.

One of the legal problems with FAA giving out STC info which belongs to lost/deceased owners is..... the STC is still owned by the estate of the noncommunicative person. 1-Who is going to be responsible for the engineering of that STC if FAA "gives" it away? 2-What if the person (or the heirs/assigns) is still around but doesn't want to issue anymore?
3-What if an unforeseen problem with an STC develops. Who will be responsible?

If a legitimate owner of an aircraft which was modified in accordance with an STC loses the documentation....then that's no different than the loss of original logbooks. The airplane will have to be inspected and new logs developed. (The potential loss of the STC documentation, and/or the death/disappearance of an STC-holder, is something every owner must consider when he undertakes to modify the aircraft. (Guard your documents! Make copies!)

I agree with the FAA policy. If anyone wishes to duplicate an STC...all they have to do is develop their own data and make application.

George the government is not concerned with estates, heirs or even living owners who do not reregister their aircraft, and the government will then take the aircraft registration. Why should STCs be different. Reregister your STC in order to establish ownership. Those with no active ownership, that are not being supported the government should release information for continued airworthiness of aircraft.

I'm not saying the government should give away an STC, in other words assign another owner. But at some point with no owner stepping forward STCs should fall into the public domain.

!. Install the landing light in the leading edge.
2. Beg or borrow a copy of the STC and make a very bad, hard to read, copy.
3. ditto the 337
4. stuff them in with the other paperwork.
5. It all came that way with the airplane when you got it.

blueldr wrote:!. Install the landing light in the leading edge.
2. Beg or borrow a copy of the STC and make a very bad, hard to read, copy.
3. ditto the 337
4. stuff them in with the other paperwork.
5. It all came that way with the airplane when you got it.

Won't be the first time THAT has been done...