PPRuNe Forums - View Single Post - JetStar A321 - insufficient stopping distance
Old 15th Dec 2011, 02:04
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flyingins
 
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Sub Orbital
No one is kidding you, but clearly you don't fly A320/A321s. Or any other large commercial jet, for that matter.

On a runway as long as DRW's (or SYD 34L/16R, BNE 01/19 etc etc) V1/VR combinations of 160 knots (or even a little higher) are both common-place and perfectly within the design parameters of the aircraft's RTO performance, particularly when using un-balanced field length calculations.

In fact the tyres on the 320/321 are rated to 195 knots, so as long as the brakes can handle the energy (which they can), the only limiting factors become TORA, ASDA, obstacles in the splay, reduced thrust parameters and runway condition.

The issue here isn't the V1 speed itself, it's the fact that it was predicated on a full length departure but the crew mistakenly took off from an intersection instead, thus making V1 and the chosen thrust setting (assumed temp or "Flex") invalid.

Common sense is relative to the knowledge you have, I'm afraid.
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