The International Cessna 170 Association

To answer your question: Appendix A to Part 43 Major Alterations (v) installation of structural parts other than the type of parts approved for the installation. The sump of an 0-300 is a magnesium structure that collects the oil that lubricates the engine. To change it to aluminum is a major alter...

FAR 43.13 (b) Each person maintaining or altering, or performing preventive maintenance, shall do that work in such a manner and use materials of such a quality, that the condition of the aircraft, airframe, aircraft engine, propeller, or appliance worked on will be at least equal to its original or...

The 0-300 sump is not a structural part, would the material change be a major modification or a minor?

Who declares airworthiness?

Have you PMA'd something before? Recently? DEM Why? have the rules changed? TC, When it comes to getting things certified, the FAA has been adhering to Moore's Law. It seems like the amount of paperwork, signoffs, justifications, etc... doubles every 18 months. Notice there is no smiley face here. ...

Alaskan Bush Wheel now owns the Production certificate, they may have some thing.

OOPS update
http://www.airframesalaska.com/AlaskanB ... s/1477.htm

Jason wrote:Ok. Can you put a 3 bolt sump and matching accessory case on an O-300A? Supposing its possible is there disadvantages to doing this?

no...

Will this be a 3-bolt? or 5-bolt sump (for accy-case fitment....folks will need to know what theirs is when they order...) You'll find the three hollers don't have this problem. Anyway this is for a 5 holler Not true, I have a three holer in my pile of hangar stuff and it has the beginnings of the ...

gahorn wrote:Will this be a 3-bolt? or 5-bolt sump (for accy-case fitment....folks will need to know what theirs is when they order...)

You'll find the three hollers don't have this problem. Anyway this is for a 5 holler

flyboy122 wrote:
Have you PMA'd something before? Recently?

DEM

Why? have the rules changed?

Tom, is this a one-time purchase, or is the tooling going to be good for future runs? When we get the model built we can use it many times. I expect the casting runs to be in units of 10. I am not a member of the cessna owners club, I simply will let the engine machine shops know that I can supply ...

Jason wrote:Count me in Tom. How do you want me to send the $500?

I have yet to set up an account for this just hold on, for now you are the first to get on board.

sorry just re read about selling price of 1K? :? :? I read that as the cost to manufacture. There would have to be some profit to pay off the tooling, correct? Let me put it to you this way. When I have 10 customers that are confirmed buyers with $500. down and $500 more upon delivery I'll order th...

Looks like there isn't enough interest in this to continue.

bagarre wrote:Instead of casting, would it be cheaper / easier to CNC mill it from an ingot of 6016?

I have no clue how to do that. or what the machine time would be.

I have discovered a forge in Seattle that has said they can cast new sumps for us. I believe this is a better solution to the corroded sump issues than trying to reline. The problem with relining them is that Okanogon Aero in Kalona BC will not touch a welded or cracked sump. New casted sumps will r...