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Using all 3 engines would slow it down much faster. No?

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    $\begingroup$ Thrust reversing engines are expensive. High on maintenance and the necessity to have so many reversers is not needed. If the speed falls below the acceptable levels, the jet drops like a ball. Dropping speed fast is dangerous. The fuselage will crack instantly or split because of such extreme temperature & pressure differences. These are just a few. I could think of a dozen more. $\endgroup$
    – user46196
    Jul 12, 2020 at 6:39
  • $\begingroup$ Because it doesn't need to slow down faster. $\endgroup$
    – user3528438
    Jul 12, 2020 at 7:17
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    $\begingroup$ @kris what the...??? $\endgroup$
    – Jpe61
    Jul 12, 2020 at 9:34
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    $\begingroup$ @Jpe61 agreed. "drop like a ball"? The plane is already on the ground...... By the way, can someone comment on the "high temperature/pressure difference" part? He might be onto something, but again, turbofan exhausts are supposed to not be very hot or high pressure $\endgroup$
    – Abdullah
    Jul 12, 2020 at 9:44
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    $\begingroup$ There is no reason the fuselage would crack or split because of thrust reversers. There is some huge misunderstanding here... $\endgroup$
    – Jpe61
    Jul 12, 2020 at 13:10

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As always, it is a trade-off.

On the positive side, thrust reversers allow you to slow down faster and reduce brake wear.

On the negative side, there are costs to install and maintain them. They add weight, which increases the required take-off length reduces the maximum payload and increases fuel consumption.

Dassault found the optimum for their design in one thrust reverser, others go with TR on all engines, none or optional.

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