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MANUFACTURING VARIED MOUNTING DISCS Nearly a hundred rigid mounting discs support scaling rings within the complex major fatigue test rig at the Royal Aircraft Establishment, Farnborough, in which a complete Concorde airframe is being subjected to the structural and thermal load environment experienced by this aircraft in service. Up to 5ft in diameter, each disc has a different curvature. As with the specimen, so these discs also have to undergo the stresses caused, in service, by taxiing, take‐off, landing and flight, together with the internal loadings imposed by cabin pressurisation, air‐conditioning and fuel handling.