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Old 27th May 2020, 11:07
  #734 (permalink)  
xetroV
 
Join Date: Jan 2005
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TOO LOW GEAR envelope

Originally Posted by unworry
Thanks again Airbubba

took the liberty of highlighting a couple of key areas below, although it's comes as no surprise to most here.

Based on the FR24 CSV data
- (best approximation, due to periodicity and latency of recorded data)
-
  • 251 IAS out of FL100
  • 240 during descent, give or take
  • 236 IAS at 2,000'
  • ~215 IAS on tarmac, skipping down to 191 IAS
  • recording a minimum of 173 IAS, 200' AGL into the GA

With that speed over the threshold, I believe the crew would never have received a TOO LOW GEAR warning during the first approach; they would have received TOO LOW TERRAIN instead (or another mode if that would have priority). I can see how a crew would discard the latter GPWS warning as being erroneous/nuisance when approaching a runway in VMC, especially a crew that had already lost their situational awareness due to extreme (probably self-induced) tunnel-vision.


Here's the mode 4a envelope.
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