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  1. HANDCALC

    Standard torque

    Have a look at "FAA Advisory Circular 43.13-1B, Aircraft Inspection Repair and Alterations", Table 7-1 recommended torque values for fasteners loaded in shear or tension. http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/0/99C827DB9BAAC81B86256B4500596C4E?OpenDocument I...
  2. HANDCALC

    MMPDS-04 CN1: Table 3.1.2.1.1. Reductions for Edgewise Orientation

    Wil, Can you repost MMPDS-04 table 3.1.2.1.1(a)? I have been unable to download it from the link you provided. Thanks
  3. HANDCALC

    Equipment rack stress analysis

    One design approach to installing equipment racks onto commercial aircraft, is to restrict the overall weight and CG of the rack to less than that of a seated passenger. Make sure the equipment rack's forward and aft attachment points on the floor are spaced further apart than the seats, and...
  4. HANDCALC

    Wind tunnel testing for Installed loads

    In addition to direct measurements of store loads in a wind-tunnel (using strain gages as suggested by RB1957), I recommend you navigate to the ASSIST website, and download a copy of MIL-H-8591H entitled "Airborne Stores, Suspension Equipment and Aircraft-Store Interface (Carriage Phase)"...
  5. HANDCALC

    Tolerances - Undimensioned Drawings

    MechDesignR, You've asked a very good question, which involves as much "human dynamics" as it does "drafting standards". When working as an MRB Engineer for Boeing, we found that mylar drawings frequently showed the same part in different zones, and that drawing ADCN's were not always...
  6. HANDCALC

    Vortex Lattice

    I have both copies (a) the first edition of Aircraft Structures by Peery (1949) and (b) Aircraft Structures by Peery and Azar (1982). If money is tight, I'd recommend the earlier (1949) edition, as it is more comprehensive, and better suited to someone who wants to be a stress engineer. The...
  7. HANDCALC

    Heat Dissipation

    Unfortunately I've only been involved with Avionics Tray and Shelf manufacture at the OEM level, where the "metering plates" at the bottom of the trays, regulate the airflow and were adjusted to match the drawing requirements. Maybe someone else can point Gbor in the right direction?
  8. HANDCALC

    Heat Dissipation

    GBor, Can you measure the cooling parameters you are interested in, rather than trying to calculate a theoretical answer? The "knock-out plugs" are intended to adjust the airflow to obtain the desired cooling results.
  9. HANDCALC

    FMS 1075

    Could these be Lockheed or General Dynamics drawings?
  10. HANDCALC

    load spectrum and usage spectrum

    Here's an old report that might help... http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=ADA030197
  11. HANDCALC

    load spectrum and usage spectrum

    To predict the fatigue life of "dynamic" or "life-limited components", we need to measure the loads produced during diffferent manoeuvres. This gives us an idea of which manoeuvres are more fatigue damaging. How often does an operator fly this manoeuvre in 1000 flight hours? This is where the...
  12. HANDCALC

    NASTRAN/FEA GUIDELINES FOR AEROSTRUCTURES?

    Download the PDF copy of AGRAD LS-147, "Practical Application of Finite Element Analysis to Aircraft Structural Design" with TAITS's two papers at: http://stinet.dtic.mil/cgi-bin/GetTRDoc?AD=A173823&Location=U2&doc=GetTRDoc.pdf Image quality not the best...
  13. HANDCALC

    Roller Swaging

    mtharp, A decade ago, when I worked at Boeing Canada, we manufactured a wide range of aircraft parts and assemblies. These included roller swaged assemblies of bearings per BAC 5435...but also line/ring staking of bearings. As an MRB Engineer, the biggest snags were with the tolerances on the...
  14. HANDCALC

    Roller Swaging

    mtharp, MIL-STD-1599 was REPLACED BY the newer MIL-HDBK-1599. Check with Boeing or your DAR whether the HANDBOOK is acceptable.. Cheers,
  15. HANDCALC

    Roller Swaging

    mtharp, (a) Download MIL-STD-1599 and MIL-HDBK-1599 from the following website: http://assist.daps.dla.mil/quicksearch/ (Type 1599 as the Document Number and click search) (b) Roller swage tools can be purchased from: http://www.cabcoindustries.com/housing.php (c) Contact Boeing to determine...
  16. HANDCALC

    Material Specs on Mechanical Drawings

    Hmxsgt, I'm hoping your Engineering group clearly understands the difference between controlling "Material Specifications" and "Minimum Material Strength Values". Make informed decisions, but you'll have to choose the approach that makes sense for your organization. RPstress correctly...
  17. HANDCALC

    Material Specs on Mechanical Drawings

    Here's the typical engineering answer, it depends... In the aerospace industry, the Bill of Material (BOM) normally specifies product, form, and temper. Additional engineering or quality requirements would be added as notes; calling up commercial or military standards as required: Example...
  18. HANDCALC

    1/4-28 Threaded Ground Stud.

    Have a look at the EM Stud PDF document from ALCOA at the following link: http://www.alcoa.com/global/en/products/product.asp?prod_id=458 Look at page 36 of 39. Could you use something equivalent to MIL-T-83454/5, Blind Stud 0.250-28 UNJF-3A? (I'm Structures, not Electrical)
  19. HANDCALC

    1/4-28 Threaded Ground Stud.

    You might consider using a nut and washer, per Advisory Circular AC 43.13-1B, Section 15, Tables 11-14 and 11-15, (pages 11-78, 11-79). Attached is a weblink to make your life easier. http://www2.tech.purdue.edu/at/courses/at308/Technical_Links/Ac43-13-1B/CH11_15.pdf
  20. HANDCALC

    Rolled thread procurement Mil Spec?

    Sheep, Perhaps some of this information is in MIL-S-8879C (Cancelled) or MIL-B-7838C (Cancelled), which can be obtained from the following site: http://assist.daps.dla.mil/quicksearch/ I don't know much about the BEFORE/AFTER heat-treat issues, but there should be something in these standards...

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