PPRuNe Forums - View Single Post - Determination of TO speeds and use of FLEX/TOGA at very low TOW
Old 12th March 2018 | 00:12
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john_tullamarine
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From: various places .....
The minimum speeds at the bottom take care of VMCG etc.

Careful - there be dragons in the details ...

Vmcg is defined for nil (cross) wind (7kts in the old UK standards). Have a think what crosswind does to the aircraft's tracking ability .. think weathercocking.

For, say, a four-engined aircraft in a 30kt crosswind, and with a critical failure on the outboard engine on the windward side .. you might find yourself with an on-the-day increase in the book Vmcg by 30-40 kts .. ergo .. in the grass you go. Probably a matter worth considering in the case where you really don't need to use that very low speed schedule eg ferry, long runway, strong wind ...

If you don't have the flexibility to increase the schedule .. do you really need to go, right now, and bet that you don't have a failure on the "wrong" side ? Maybe you could delay until the wind abates a bit ?
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