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Old 13th Jun 2010, 08:23
  #85 (permalink)  
PBL
 
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Whatever caused this problem, I doubt it's down to differential ROD. IFLY INDIGO says he was 700 ft/min with a tailwind of 8kt on a 3° GS. That equates to a ground speed of 135 kts, if I am doing my arithmetic right (3° is about 1 in 19, and 1kt is about 100ft/min), which means AS of 127 kts, so Vapp was 127 kts for him. Still wind, GS 3°, Vapp 127 kts yields ROD of 660 ft/min.

The difference, 40 ft/min, is not by itself enough to have a crunch almost to inspection levels. And lift when the tailwind went would have been increased, so some of this 40 ft/min difference would have been compensated.

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