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Looking by the window I saw two planes approaching Haneda. It stroke me as a bit odd that one of the plane seemed to have stopped descent and might not have intended to land.

I checked flight radar, and sure enough the flight did not landed and went around. Then, a cart came and inspected the runaway.

It was at around 16:00 local time and the closure seems to have lasted just a few minutes.

What happened on this runway ?

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    $\begingroup$ See: When (if ever) can ATC order an aircraft to go around? and How common are cancelled landing attempts? / from those: unless there is something worth investigating, it's nothing out of the ordinary and there could be many reasons, which are listed in the first topic $\endgroup$
    – user14897
    Commented Nov 12, 2021 at 12:03
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    $\begingroup$ Probably a report of FOD by a preceding aircraft. $\endgroup$
    – Ron Beyer
    Commented Nov 12, 2021 at 12:32
  • $\begingroup$ Not sure how it is "opinion based". Someone with ATC recording could give an answer. We have none right now and that's... fine. $\endgroup$
    – Antzi
    Commented Apr 14, 2022 at 9:54

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If you noticed an inspection vehicle on the runway in question, some of the possible reason for performing an inspection are:

  • previous landed aircraft noticed something on the rwy during landing
  • previously landed or departed aircraft was noticed to be missing some parts
  • previously landed or departed aircraft reported technical issues during landing or takeoff
  • specific to some regions, like Japan, an earthquake of sufficient magnitude was registered near the airport (none were registered within the timeframe you specified)
  • animals, drones or other "unauthorized entities" were seen in the vicinity of runway

In addition to these "ad-hoc" inspections there are regularily performed inspection, such as friction measurement if weather deems necessary, but these are scheduled, and should never necessitate go-arounds.

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