Recent content by mtharp

This ducting is installed on the aircraft, inboard of the of the check valve. For that application either fiberglass or aluminum are used. This is not part of the ground a/c unit.

Thanks debodine. That's what I've decided to do.

The testing requirements are governed by 14 CFR 25.1438. I am looking for a specification that governs the process of determining that the part meets the requirements.

Thanks Jim, I know how to proof test it. My ACO would reject your process. I need a spec that controls the process so I can call it out on the drawing.

I am designing a ground air-conditioning duct out of .035 inch wall, 5 inch I.D. 6061-T4. Operating pressure is 13 psig. Per 14 CFR 25.1438, I need to proof test to 1.5X and burst test to 2X normal operating pressure. I have looked but can’t find an AMS, ANSI, or other specification that...

Since bird remains have been found in both affected engines I don't the AD has any relevence in this situation. I don't care how robust your engines are, a couple of big geese will do some damage.

tbuelna, Thanks for the input. I've already looked through the brushwellman site as well as others and I couldn't find any literature on inspecting for heat affected zones on post machined BeCu. I am not going to worry about it. Thanks again.

I don't think Geraldo Rivera can even spell AD. I wouldn't give that story much credit until it comes from a more reputable source.

I’m designing a part made from Beryllium Copper (AMS 4533) which will come to the machinist already in the precipitation hardened condition (AT temper). Because it will be hardened when it is machined (approx 180 ksi) would it be wise to perform an NDT to detect and machining abuse? I know...

Thanks all. This project has been shelved for financial reasons.

I am cading up a model airplane and the fuselage formers all have the same geometry. They get smaller towards the empenage. I know that there is a way to create a design table in catia so with only a few parameters you can change the geometry of a sketch. This would come in very handy in this...

I am looking for a commercially available spec for wrought copper alloy similar to C86700. I have already found ASTM B584, but that is for sand casting and is not ideal for my application. Any ideas? Thanks for the help.

Handcalc, Thanks. We don't go after helicopter parts largely for that reason.

It's not a sheet. I am swaging two bushings and a roller bearing into a aluminum body. In order to get the part FAA certified they require full substantiation of the design. This includes the specs on any secondary ops used in the fabrication of the part. Besides, just telling the...

After reading through MIL-HDBK-1599, it doesn't really address what I need. Is there an AMS or other spec that covers roller swaging?