Engineering news for design engineers: standard revisions, investigation findings, notable projects and new methods, each with primary sources and analysis.https://checkedcalc.com/en-gbhttps://checkedcalc.com/news/america-makes-jaqs-sq-additive-supplier-qualification-25-teams/https://checkedcalc.com/news/america-makes-jaqs-sq-additive-supplier-qualification-25-teams/America Makes named 25 teams for JAQS-SQ Groups 2 and 3, a $10.5M effort to qualify LPBF and DED metal AM suppliers. What it means for buying printed parts.Tue, 29 Sep 2026 00:00:00 GMTMaterials and methodshello@checkedcalc.com (The CheckedCalc editor)https://checkedcalc.com/news/astm-f3125-26-rcsc-2025-structural-bolts/https://checkedcalc.com/news/astm-f3125-26-rcsc-2025-structural-bolts/ASTM F3125/F3125M-26 is the active structural bolt edition and RCSC 2025 adds Grade 144 bolts and drops the calibrated wrench. What to check in your joints.Tue, 29 Sep 2026 00:00:00 GMTStandards watchASTM F3125/F3125M-26RCSC Specification for Structural Joints Using High-Strength Bolts, 5 June 2025hello@checkedcalc.com (The CheckedCalc editor)https://checkedcalc.com/news/boeing-777-9-full-scale-fatigue-test-120000-cycles/https://checkedcalc.com/news/boeing-777-9-full-scale-fatigue-test-120000-cycles/Boeing says its 777-9 full-scale fatigue airframe has passed 63,000 of 120,000 planned flight cycles at about 160 a day. What the test proves and how to use it.Tue, 29 Sep 2026 00:00:00 GMTIndustry14 CFR 25.571hello@checkedcalc.com (The CheckedCalc editor)https://checkedcalc.com/news/en-1993-1-1-2022-second-generation-eurocode-3/https://checkedcalc.com/news/en-1993-1-1-2022-second-generation-eurocode-3/EN 1993-1-1:2022 supersedes the 2005 Eurocode 3 general rules. BSI withdraws the first generation on 30 March 2028. What changes for column buckling checks.Tue, 29 Sep 2026 00:00:00 GMTStandards watchEN 1993-1-1:2022BS EN 1993-1-1:2022EN 1993-1-1:2005+A1:2014hello@checkedcalc.com (The CheckedCalc editor)https://checkedcalc.com/news/fraunhofer-iwm-am-surface-post-treatment-fatigue-40-percent/https://checkedcalc.com/news/fraunhofer-iwm-am-surface-post-treatment-fatigue-40-percent/Fraunhofer IWM links shot peening, deep rolling and burnishing of printed AlSi10Mg, 316L and Ti6Al4V to an FKM fatigue assessment. What it means for design.Tue, 29 Sep 2026 00:00:00 GMTMaterials and methodsFKM guideline (analytical strength assessment)hello@checkedcalc.com (The CheckedCalc editor)https://checkedcalc.com/news/iso-965-1-2026-metric-thread-tolerances/https://checkedcalc.com/news/iso-965-1-2026-metric-thread-tolerances/ISO 965-1:2026 replaces the 2013 edition of the metric screw thread tolerance system, folds in Amendment 1:2021 and adds coated-thread clauses. What to check.Tue, 29 Sep 2026 00:00:00 GMTStandards watchISO 965-1:2026ISO 965-1:2013ISO 965-1:2013/Amd 1:2021hello@checkedcalc.com (The CheckedCalc editor)https://checkedcalc.com/news/nasa-sweet-15-truss-braced-wing-test-to-failure/https://checkedcalc.com/news/nasa-sweet-15-truss-braced-wing-test-to-failure/NASA Armstrong tested its SWEET-15 composite truss-braced wing to failure at roughly 127% of design limit load. What bracing means for joints and margins.Tue, 29 Sep 2026 00:00:00 GMTIndustry14 CFR 25.30314 CFR 25.305hello@checkedcalc.com (The CheckedCalc editor)https://checkedcalc.com/news/tsb-a23p0020-pw150a-compressor-blade-resonance-fatigue/https://checkedcalc.com/news/tsb-a23p0020-pw150a-compressor-blade-resonance-fatigue/TSB Canada traced a PW150A compressor blade fracture to high-cycle fatigue at a 26 000 rpm resonance. Lessons on dwell time, tip clearance and cold-day stress.Tue, 29 Sep 2026 00:00:00 GMTFailures and lessonshello@checkedcalc.com (The CheckedCalc editor)https://checkedcalc.com/news/tsb-r23e0029-shattered-rim-wheel-inclusion-fatigue/https://checkedcalc.com/news/tsb-r23e0029-shattered-rim-wheel-inclusion-fatigue/TSB Canada found a 1991 freight wheel with oxides and voids up to 5.7 times the current limit grew subsurface fatigue cracks, shattered and derailed 18 cars.Tue, 29 Sep 2026 00:00:00 GMTFailures and lessonsAAR Specification M-107/M-208AAR Interchange Rule 41hello@checkedcalc.com (The CheckedCalc editor)