Like all supersonic production aircraft prior to F-16, the Blackbird had
irreversible hydro-mechanical flight controls but they were augmented by
electronics. As noted in an earlier post, the yaw axis was critical in the
event of an inlet "unstart" (inlet spike malfunction) which produced a large
and sudden drop in thrust from that engine. The unstart (and resulting
uncommanded yaw) was much scarier than the electronics of the day.
Eventually the yaw damper was given full authority which significantly
reduced this yaw transient. In early flights (with limited yaw damper
authority) inlet unstart consequences ranged from broken helmets to aircraft
structural failure.
It is amazing how far electronic flight controls have come. See:
http://mikrokopter.de/ucwiki/VideoAbspielen?id=188
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