|Quoting Julesmusician (Thread starter):|
How easy is it for pilots of commercial aircraft to find out the wind speed they are in - is it just a matter of pressing a button and the computer will tell you or do you have to do some calculations yourself? The reason is I have heard air traffic ask pilots and they come up with the answer straight away so I assume it must be on a readout on one of the computers?
|Quoting Starlionblue (Reply 1):|
Basically, and I am sure the pilots will enlighten us, two data sources are used:
- GPS and/or inertial guidance (laser gyros) give data on ground speed.
- The pitot static system gives data on air speed.
Onboard systems figure out the difference and thus wind direction and speed. All at the click of a button.
|Quoting AAR90 (Reply 4):|
If not being displayed on a screen at all times (most newer FMS'), it is a matter of a few keystrokes (non-FMS or earliest FMS acft) to see a wind display
|Quoting Speedracer1407 (Reply 5):|
Incredible systems, these things. But, I can't quite get my head around how the system would accurately calculate wind direction, especially if it were changing all the time. Perhaps my lack of knowledge of the pitot static system is the culprit here.
|Quoting Loggat (Reply 2):|
Looks at your true airspeed, compares with your groundspeed and then couples it with your crab angle (heading vs. track) to come up with a speed and direction of the wind.
|Quoting PhilSquares (Reply 6):|
On every "glass" aircraft I've flown, the wind is depicted on the ND. So, no keystrokes required at all!!!