Airspeed in turbulence
Concerning the incident on the last page of this report....
http://www.bea.aero/ita/pdf/ita.005.en.pdf Why is it better to select an airspeed than a mach number. Conduct of flight in turbulent atmosphere The pilot selected a Mach number, and not a speed, in accordance with the instructions in moderate turbulence, which led to speeds above the recommended speed (308 kt maximum) without, however, approaching VMO(15). These actions were not sufficient in face of the strength of the turbulence that was in fact encountered. |
In sever turbulence a speed nor a mach are to be set,just a turb N1.
For lighter turb or to get better reaction from the AT,selecting a speed rather than a mach nr is working quite well. |
The aircraft gust envelope is plotted against EAS, that's why.
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At a guess I'd say IAS/Mach crossover (haven't read the report). On the Douglas/Boeing 717, turbulence penetration speed (above 10,000') is 275 kias/ M0.75 whichever is the less.
It's quite common to see folk preselect M0.75, which can be significantly faster than 275 kias, depending on the altitude. :ugh: |
Capt claret! You are spot on with your reply!
On a 777 the turb speed is m.82 or 280 whichever is less, if you are heavy it is To be 15 kts above the yellow band, this causes sometimes confusion !??! ??? The crossover usually is between FL 340 and 350 then 280 becomes M.82 Amazingly during climb pilots observe this speeds quite strict,during descent They tend to fly faster and do not care to much about turbulence, - strange, but That's how it is! |
The aircraft gust envelope is plotted against EAS, that's why. Would you be kind to explain or provide me an explanatory document? Thanks a lot. |
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