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Some what surprisingly in these PC days, Be alloys (90%+ Be) were quite extensively used as a braking heat/friction pack on some A/C in the late 60 early 70's e.g C5 and F14, until Carbon-Carbon came along as a lightwieght replacement. However I understand the Be brakes suffered badly from disk cracking. I think the F14 was only cleared for Be brakes whilst carrier deployed.