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Recent content by cmarinelli

  1. cmarinelli

    What the heck are Blow Out Doors?

    I must say I regret asking a question and starting this thread. Thanks to rb1957, wktaylor, FredGarvin, and SparWeb for understanding why I might ask such a question. My company has obtained many dozens of FAA-PMA's, and are mindful of FAA regulations governing certification of the same (Order...
  2. cmarinelli

    Working with FAA budget cutbacks

    We try to work very transparently and openly with the NYACO, and it has paid off to some extent. While it does take some time for our PMA's to get approved, they eventually slog through it. We are in the process of agreeing to an MOU with the NYACO for non-critical items, and they seem quite...
  3. cmarinelli

    What the heck are Blow Out Doors?

    Gentlemen (except RB1957), I apologize for not being born with an innate knowledge of all aircraft systems. We typically work on turbine engine components, but are branching out into other areas and trying to LEARN before we start Reverse Engineering. We've asked our airline contacts and...
  4. cmarinelli

    What the heck are Blow Out Doors?

    Hello everyone, I'm reverse engineering a latch that is used on a "blow out" door of a turbine engine thrust reverser. I like to know exactly what the part's function is, but I'm stumped here. What exactly is the function of this blow out door? Does it simply alleviate an overpressure in the...
  5. cmarinelli

    Viton FR 44/60 equivalent

    Hello all, I'm not a rubber or seal expert - my experience with these are quite elementary. I apologize in advance for any really dumb questions. My company is Reverse Engineering a Back up Seal for an aircraft application. The material appears to be a green viton by virtue of the packaging...
  6. cmarinelli

    Euro Steels & specs

    TVP, I must thank you for your detailed response. I actually contacted some of the mills you listed, and am awaiting information. Thanks Again, Chris Marinelli
  7. cmarinelli

    Euro Steels & specs

    Hello All, I am Reverse Engineering two aircraft fasteners that have me thrown for a loop because the materials are not US-type HSLA steels. The first is a 30NCD16 steel that is 180-200KSI in the H & T condition. The only specs I can find on this material are prEN2478 and prEN2137. Is anyone...
  8. cmarinelli

    Closed Impeller Design

    I will definitely check those out. Thanks! Chris
  9. cmarinelli

    Closed Impeller Design

    Can anyone recommend a good reference for design of closed centrifugal impellers? We are reverse engineering a closed impeller for an aerospace fuel pump, and would like to optimize the design to reduce vibration. Does anyone know if the reference listed in the Pump Engineering FAQ has a good...
  10. cmarinelli

    Nickel passivation

    Hi everyone, I read recently that nickel alloys formed or machined with steel tools can have ferrous material smeared or impregnated into the surface. This material, of course, can oxidize when exposed to high temperatures. Is there a common surface conditioning or 'passivation' spec that is...
  11. cmarinelli

    Post-weld Heat treatment specs for Hi-temp alloys

    MC Profusion and TVP, Thanks a lot for the information. I already have some of the Special Metals info, but not all. Is AMS-STD-2219 (now AWS D17.1) the defacto standard in aerospace fusion welding? Thanks Again, Chris
  12. cmarinelli

    Post-weld Heat treatment specs for Hi-temp alloys

    Hello everyone, My company is reverse engineering a turbine engine component that consists of a small plate onto which two bolts are welded. The plate is most probably Inco 718, and I believe the bolts are Inco 718 or A286 (lab analysis pending). My question is: Are there separate specs...
  13. cmarinelli

    Method to put comments in a sketch?

    Does anyone know if there is a way to put some descriptive text in a sketch for Reference Only? Sometimes it would be helpful to have a brief explanation of what's going on in the sketch. When I make operation sheets to machine a component, I might say "Op 50, N/C lathe, .03 stk on -A-...
  14. cmarinelli

    Chamfer square hole

    Hi CAEman, The edge break is for clearance on a turbine engine variable vane trunnion. We are reverse engineering the part, so we must duplicate what is present. I know it's an odd example, but I think the general idea of removing material with a solid moving along a path is something many...
  15. cmarinelli

    Configurations & Dimensions

    I think Regg has it right. The best way to handle it is to hide the dimension and manually add another dimension with the appropriate tolerance. Thanks to everybody who responded! Chris
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