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Originally Posted by NickN
If the weather was that bad surely all aircraft would have been assigned lower altitudes.
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Maybe NickN, maybe. But read what I wrote:
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The reason for it being at FL300 for this period is possibly due to inflight weather (wind, turbulence etc) and also the heavy weight of the aircraft in the initial stage of the flight
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You simply can't take a 747 to its service ceiling when it is operating a long haul flight and is full of fuel, freight and passengers. It simply isn't possible.
It's not only the weather that can affect the level at which an aircraft is operating. I am sure one of our resident 747 crew can elaborate further on why QF063 was at FL300 today.