DENIS SMITH wrote:

Amen.  If the vertical stab did in fact fail, and the
first officer called for full thrust, any differential
thrust between the engines while they spooled up would
turn the aircraft into a spinning top.  Imagine trying
to fly single engine in a twin without a vertical stab
and rudder!!  Can't be done.  In such a situation the
aircraft is totally unstable in yaw.  The 727 above FL
290 without the yaw damper engaged develops Dutch roll
that is almost uncontrollable.  We used to practice a
procedure (simulator only!) and it was really an eye
opener.  (And that was with a fully operable rudder!)

 
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