ATR Prop Brake ???

Organization: UTRC
Date:         08 Aug 95 01:45:09 
Followups:    1 2 3 4
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  I recently flew a short leg on an ATR aircraft.  I noticed when the crew
  started the right engine (couldn't see the left) the prop was held in
  position by some kind of brake.  The engine ran at gound idle for a
  few minutes before the brake was released.  When it was, the prop
  spooled up real fast.

  When we shut down, it was obvious the prop was stopped with some kind
  of brake, while the engine continued to run.

  My question...  How many turboprop aircraft are equipped with a "prop
  brake", and why?