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Around 1977, I watched a DC-9 landing at Guacimeta airport, Lanzarote, Canary Islands, Spain, opening the flaps reversing thrust of both engines just over the airstrip end, but some 9 feet over the ground. Of course, it fell down that height as fast as a stone. Is this usual?

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  • $\begingroup$ The previous question was rather theoretical: What if? but this refers to an actually watched case. The underlying subject is the same, yes. It's up to you mixing or fusing both. Thanks. Salut + $\endgroup$ – Urquiola Nov 21 '17 at 17:56
  • $\begingroup$ Well, you ask whether it is common. The other question answers that one. The answer here should be clear: This is very, very unusual. $\endgroup$ – Peter Kämpf Nov 21 '17 at 22:44
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The system will allow deployment based on various criteria, and radio altitude height may be one of them, so even for a system not designed to operate "in flight", you still can deploy the TR's a few feet off the ground. Pretty ugly, rough touchdown when you do, though, and certainly not advised. How often that happens would be speculation, but probably very rare.

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