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  1. CRACKKILZ

    Fatigue Critical Baseline Strucure

    Can anyone tell me if "safe life" parts show up in FCBS listings or are these limited to "damage tolerant structure"?
  2. CRACKKILZ

    Tensile Allowable for NAS1398B Blind Rivet

    Sorry, I meant 375 lbs.
  3. CRACKKILZ

    Tensile Allowable for NAS1398B Blind Rivet

    The only data that I can find is for "solid rivet tension allowables in various thicknesses of 24ST alclad sheet". The data comes from the design offices of the Glenn L. Martin Company .... Detail Aircraft Structural Analysis Supplement Pamphlet # 8. According to this reference: For a 5/32"...
  4. CRACKKILZ

    Tensile Allowable for NAS1398B Blind Rivet

    An NAS1398B blind rivet crosses to a CR2263 cherry lock (Ref DC-9 SRM 51-30-0 Fig # 92). Per the Cherry/Textron Tech data sheet, a 5/32" CR2263 has an ultimate tensile strength of 375 lbs. They reference MIL-STD-1312 and NAS1400 as the source of their data. I have a couple of comments also: 1...
  5. CRACKKILZ

    AMS 4640 Al-Ni-Br Bushing - Mat'l Allowables

    Can anyone tell me where I can find the bearing allowable for AMS 4640 aluminum nickel bronze? I am trying to analyze a bushing installation in a lug. Thanks
  6. CRACKKILZ

    Bearing Allowable for AL-NI-BR AMS 4640

    Can anyone tell me where I can find the bearing allowable for AMS 4640 aluminum nickel bronze? I am trying to analyze a bushing installation in a lug. Thanks
  7. CRACKKILZ

    Use of the word "engineering" in company name

    In the Airline/Aerospace Engineering field the FAA delegates certain engineering functions to private individuals. One such delegation is called a DER or Delegated Engineering Representative. Many DERs do consulting work for private organizations. A DER has delegated authority to approve...
  8. CRACKKILZ

    Crash Loads For Military Aircraft

    alexeu The 100Gs and 300 pounds was a Boeing recommendation for a project I was involved with several years ago. I think it is pretty much an industry standard now.
  9. CRACKKILZ

    Crash Loads For Military Aircraft

    Depending upon the type of antenna you are planning to use (long blade vrs flat etc) there are a couple of other design cases you may want to consider. 1. 100 Gs applied in the up, fwd and lateral directions to account for vibrations. 2. A hand load (abuse load) of 300 Lbs in all directions...
  10. CRACKKILZ

    Electromagnetic Dent removers-Advice

    In a former life I worked as a Liaison Engineer at Douglas on the MD-80 program so I am somewhat familiar with the capabilities AND LIMITATIONS of EDR. Based on my experience, unless there have been some drastic improvements, I would be very reluctant to spend capital resources on such a...
  11. CRACKKILZ

    Grain Orientation for bends

    Rob130 Rob,I too believe your solution is the best compromise. In addition, you bring up an interesting point that I believe warrants further discussion. Many MRB aerospace/aircraft engineers are unaware that aircraft mechanics are taught to bend formed angles at 90 degrees to the grain...
  12. CRACKKILZ

    Fuselage Skin Repairs and Drag

    737eng Good to hear from you. I suggest you post this thread in the aerodynamic engineering forum also. With regard to the use of button head fasteners, I know that this has become an industry trend especially when repairing thin skins (such as on the 737). The recent SRM changes are at least...
  13. CRACKKILZ

    Joint Allowables, Existing Fastener Locations

    The use of csk repair washers is standard practice on Boeing aircraft. I am not aware of any joint strength test data for this type of joint. I believe your method for determining joint strength may be overly conservative. Assuming the csk repair washer is bonded in place with some kind of...
  14. CRACKKILZ

    BASEBALL BATS

    In the aerospace world we evaluate dents in aluminum structure by measuring the depth of the dent and the width of the minor axis. Generally speaking the "sharper" the dent or crease, the more concerned we are about cracking (on the inner tension side surface). Although there is a cold working...
  15. CRACKKILZ

    Paint Approval Considerations

    Depending on the aircraft type and utilization there are many things one should consider. A few that come to mind are listed below - Commerical Stripper issues: 1. Hydrogen embrittlement of high strength steel parts such as the langding gear etc. 2. Possible damage to composite parts 3...
  16. CRACKKILZ

    Why do some people fail?

    My experiences in the corporate world have taught me that the root cause of an individual's "perceived" failure can often be attributed to poor or ineffectual leadership within the organization. Extracted from SUN TZU - THE ART OF WAR "When the general is weak and without authority...
  17. CRACKKILZ

    Repair Strap Inter-rivet Buckling Calculation

    SuperStress, thanks again, the method you suggest makes sense. I only employ repair straps for minor damages on the flanges of beams. If the damage removal involves a complete trimout (generally more than 50% material loss), or if the damage gets into the radius, an angle is the way to go. As...
  18. CRACKKILZ

    Repair Strap Inter-rivet Buckling Calculation

    SuperStress thank you for your response. I do in fact have the Flabel book you mentioned, it is one of my best resources. As you suggested I looked at page 366, and that is not exactly what I am looking for. To better articulate my original question perhaps an example is in order. In Flabel...
  19. CRACKKILZ

    Repair Strap Inter-rivet Buckling Calculation

    I am familiar with several methods for calculating the inter-rivet buckling stress (Fir) of a repair strap in compression. I would like to know what other engineers use as an "effective" strap area to calculate the actual inter-rivet buckling load of the strap? In the past I have been told to...
  20. CRACKKILZ

    Longeron crack repair

    Why not trim out the crack and just remake the splice, same as original, but extend it forward of the crack to pick up good material? In any case, strap repairs are generally not considered ideal for compression type loading. In order to size your strap for inter-rivet buckling, usually it ends...

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