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Vertical speed (Read 753 times)
Alexiyi
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Vertical speed
Jul 12th, 2021 at 11:27am
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When 737-500 descend via VNAV it can descend -6000 ft/min that's why overspeed happens.
  
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KevinAviation_HD
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Re: Vertical speed
Reply #1 - Aug 12th, 2021 at 10:53am
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Same issue here!
  

Kevin
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CXA001
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Re: Vertical speed
Reply #2 - Oct 2nd, 2021 at 6:04am
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Same issue with the 737-300
  
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KG1000
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Re: Vertical speed
Reply #3 - Jan 14th, 2022 at 7:50pm
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Folks,

I also find this, it is a bug. Vnav naturally want to try reach the profile but as you say it will often blast past. The way I have found to prevent this is to use the green banana indicator to then descend in V/S mode adjusting the descent as needed. I have found that in Vnav path when in the steep descent, once the descent profile is reached the descent will pass through and lower!
So, for example, if descending to say FL070 and passing FL100 the a/c is in a high descent, engage V/S initially at say 500 fpm to slow the descent rate. One speed is back under control, descend in V/S adjusting the rate using the green banana. I find this essential and effective if flying on line and getting close to the airfield.

Best,

Keith
  
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