Flat Spin. A spin in which the tail of the aeroplane drops and the machine rotates in an almost horizontal plane. Recovery from a flat spin is difficult and sometimes impossible.
8: Flat Spin — Geometry
Figure 18.8 shows another spin mode. This time the rotation rate is higher than previously. The spin axis is very close to the right wingtip.
July 4 - Vladivostok Air Flight 352, a Tupolev Tu-154 enters a flat spin on approach to Irkutsk Airport in Irkutsk, Russia, crashes down onto its belly and bursts into flames in a wooded area killing all 145 aboard.
We used to kid that that the airplane would land itself and several times they did, after a pilot tailed out. I watched one bail out after gittin into a flat spin and the glider set down with just a little bit of damage.
 See also: Stall, Spin, Roll, Rudder, Airspeed
  
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