Bofredrik From , joined Dec 1969, posts, RR: Posted (7 years 9 months 1 week 1 day 13 hours ago) and read 3257 times:
When flying with a British Airways A320 did i notice that the a/c on its way from A to B and on 33.000 ft was reducing and increasing speed all the time. Not much but it was like it had difficult to hold a certain speed exact. I have not notice this on any other type of a/c than A319/320/321. Is this some type of "Airbus" thing?
Of course not! The pilots were probably following instructions from ATC to avoid crossing the paths of over flights in the area. On a recent BA flight (a 737) we experienced an unusual climb just like you explained. Some passengers obviously became worried thinking that the plane might be lacking power until the captain made an announcement that the changes we were experiencing were due to heavy traffic and he was constantly forced to climb, slow down, speed up, and climb over other aircraft.
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CYatUK From United Kingdom, joined Apr 2006, 810 posts, RR: 0
Reply 5, posted (7 years 9 months 1 week 1 day 9 hours ago) and read 2870 times:
Quoting Bofredrik (Reply 4): It had a steady cruise on 33.000 ft and not any change of altitude.
I may be wrong on this but the aircraft may have been heavy for the given speed and altitude.
The engines increased power to take the aircraft to the selected speed and decreased it so as to keep the speed constant (at the selected atlitute)
However, for some reason or another, the aircraft slowed down which meant that the engines had to increase power again. And the process kept going like this.
Mhodgson From United Kingdom, joined Dec 2002, 5047 posts, RR: 25
Reply 6, posted (7 years 9 months 1 week 1 day 8 hours ago) and read 2814 times:
Well if winds are strong, variable and gusty, the airspeed of the aircraft will constantly be changing, and the engines will be changing to accommodate this. If the aircraft is heavy, it will increase the problem.
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