LVTMB From United States of America, joined Oct 2004, 395 posts, RR: 0 Posted (9 years 2 months 4 weeks 5 hours ago) and read 3551 times:
I was wondering ... I noticed that since the storm last week, ATC controllers at MIA and other South Florida airports provide wind heading and speed advises as estimates -- as opposed to actual readings? (Wind estimated at zero eight zero at one zero). What is behind the language change?
Kohflot From , joined Dec 1969, posts, RR:
Reply 2, posted (9 years 2 months 4 weeks 4 hours ago) and read 3515 times:
It might be a technicality. The hurricane likely did some damage to the anemometers on the field. They could be using a backup that's not 'legally' reliable, or the repaired anemometer might not be completely calibrated yet. Stating the winds to be 'estimated' conveys the message that the accuracy of their information can't be guaranteed.
Echster From United States of America, joined Sep 2004, 400 posts, RR: 0
Reply 4, posted (9 years 2 months 3 weeks 6 days 15 hours ago) and read 3347 times:
It could also be estimated if the wind sensor is not located near the approach end of the runway. For instance, Runway 9 is in use but the wind sensor isn't working. The Runway 27 sensor is operating, so the wind is estimated.
OptionsCLE From United States of America, joined Jun 2004, 467 posts, RR: 0
Reply 5, posted (9 years 2 months 3 weeks 6 days 15 hours ago) and read 3338 times:
Kohflot and SPREE34 have it right. If the certified wind speed/direction indicator is out of service ATC may use a backup that while technically correct is not legally "correct," hence the "estimated."