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Old 4th September 2018 | 08:28
  #26 (permalink)  
pineteam
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From: Somewhere over the rainbow
Originally Posted by vilas
How many of us know why when heading is pulled CLB changes to OPCLB but DEC changes to present VS and not OPDES?
Hi Vilas.

I dunno. Please share the reason. If I had to guess: I would think to avoid unnecessary thrust variation. Turbine engines don't like thrust variation. And also it's safer I suppose.Going from ''DES'' to ''OP DES'' would possibly means going from -500/-1000 feet a minute to a much higher rate of descent as the engines would go to idle.
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