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Two excellent sources for bushing tolerances/fits are ANSI B4.1, American National Standard for Preferred Limits and Fits for Cylindrical Parts, and, if you are working with British aircraft, BS 1916 (inch) or BS 4500 (metric).

MIL-H-6088 is the heat treating spec used by the mills. For in-house heat treating of aluminum, the correct spec is AMS 2770. Chuck

Russ, I know that when I worked at McDonnell Douglas, the design allowables for aluminum flush head rivets installed in machine-countersunk sheet with greater than 70% depth of countersink were reduced. The reason was that head tilting will occur under relatively low loads, which adversely...

Hi Gerryy! Solid rivets require high forces for installation which can, in some cases, damage rigid structure such as machined flanges. This is especially true for the vibration driving of titanium, A-286 and Monel solid rivets. The vibration driving of aluminum rivets require only moderate...

Thanks, Guys, for the info and thoughts. I've decided to use C63000 nickel aluminum bronze per AMS 4640 Condition TQ50 in lieu of the C63020 per ASTM B150. I'm assuming that Fcy=Fty (68 ksi, obtained from ASM Metals Handbook, Vol 2). I hope to convince the FAA that the C63000 is as strong as, or...

Thanks, guys! I appreciate the reponses.

Will: I screwed up, they're Hawkers not Falcons (too many projects in my pile). Chuck

Hi Will! Thanks for the info. My problem is that I need a material that is equivalent to the British Spec DTD197. I had a couple of existing bushings (these are on Falcon aircraft, by the way) chemically analyzed. The result is that the chemical analysis showed that C63020 is the equivalent. My...

We are looking at replacing a metal fairing with a fiberglass laminate and the FAA wants us to do a "Pressure Box Test." I can't find any literature on it. Is it a static test or fatigue test? I assume that it is associated with the dynamic pressure at altitude but I don't know if it...

Jim: Have you looked at MIL-T-9046 and MIL-T-9047? They should give you strength values for both wrought and forged titanium.

I need the compressive yield strength for C63020 nickel aluminum bronze bar in order to calculate bushing yield. Does anyone know where I can find this information? MIL-HDBK-5 and any of the websites give only tensile properties. Also, is there any other way to calculate bushing yield strength...

Hawker Siddeley specifies spin dimpling for their fuselage skins. Does anyone know what this process entails? Also, would hot dimpling be an acceptable substitute? Thanks, Chuck

Does anyone know if there is a US equivalent for British S154 steel die forgings? All I can find is that it's classified as 57 ton 2-1/2% nickel-chromium-molybdenum steel. What I really need to know is its properties: Ftu and Fsu. Also, is it weldable? Thanks, Chuck

Brian: Have you looked at C86300 manganese bronze (AMPCO 66) per AMS 4862? It has a min tensile strength of 110 ksi and a min yield of 60 ksi. Ampco Metal, fax 414-645-3225 Chuck

FAA Advisory Circular 43.13-1B provides a table of torque values for various bolt/nut combinations.

Have you considered using Acres Sleeves? These are grooved sleeves made from either 5052 1/2 hard, 6061-T6 and A286. The grooves allow the sleeves to be broken off to the necessary length. Acres Sleeves are a J.O. King product. Their address is 711 Trabert Ave N.W., Atlanta, GA 30318, CAGE Code...