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7 years, 4 months ago
In the picture below I noticed there are three circles or holes of some kind ahead of the wing, what are those?
Jan 21, 2016 at 16:20
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The three large circles indicated in the question are
static port plates. These measure the static pressure of the surrounding air, which is used to measure airspeed and altitude.
a link from Jonathan Walters, here is a closeup of one:
The four smaller areas in a row along the centerline are the
radar altimeter transmitters/receivers. The radar altimeter uses radio waves to determine the aircraft's altitude above the ground. This diagram for the A345 has them further aft, they're in similar configurations on other aircraft.
Jan 21, 2016 at 19:26
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