For the Typhoon spar fittings they call for a “stamping” which would be a forging. Typically for a forging I would question building new with CNC from billet as it would reduce strength by eliminating the continuous grain structure that gives a forging its strength (like in a crankshaft). With the case of these parts there is a note that shows you can use form cutters for cutting the entire fork area; this would cut through your grain on a forging in the same method as it will when machined from billet. I don’t think there would be any issues using CNC and still having an airworthy part. In wartime the stampings would use up less material than billet and save a great deal of machining time, in the case of new build it doesn’t make sense to forge.

Ian