Speed Pattern

[1818]

Hi,

I am just curious about the speed pattern - why would an aircraft mid air all of a sudden go down from 550mph to 203mph just for couple?
And couple hrs later increase speed from 580 to 876 for couple min?

Please see below link from flight aware
https://flightaware.com/live/flight/AAL1580/history/20180828/1540Z/KPHX/KEWR
and
https://flightaware.com/live/flight/AAL1580/history/20180827/1550Z/KPHX/KEWR

I get nervous when I fly so just wanted to know if this is normal?

Thanks!

 

[robbedagain]

Welcome aboard. There are various reasons why they do that and its fairly common if not normal. There are certain airports whereas shortly after takeoff the crew will throttle back engine power due to restrictions. SNA. CLT are 2 of them

 

[1986Mekanic]

A pilot could provide a better answer but I'm gonna take a shot and go with what's called flow control. Some airports require a flight to land at a specific time, a flight that is ahead or behind schedule could explain fluctuations in airspeed.

 

[1818]

Thanks you guys! Really appreciate your reply.

 

[limit]

Thanks you guys! Really appreciate your reply.

You are assuming the data is correct.
876 mph ?

 

[1818]

You are assuming the data is correct.
876 mph ?

Good question! It does seem quite high .... but that's what I captured from the graph on Flightaware (Please see link i the original thread)

But you are right based on google search that's about 762 knots which for B737 is very high

 

[wcs]

Erroneous data on Flightaware. It should be a straight line instead of the peak and valley

 

[Buck]

876 kph =544 mph