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Old 31st Jul 2018, 06:49
  #12 (permalink)  
ETOPS
 
Join Date: Apr 1999
Location: In front of a computer
Posts: 1,860
I was a Boeing 772 Captain for 4 years and regularly flew at FL410 - simply following the flight plan produced by the company. Even at high weights there was sufficient margin (the gap between VMO and the hockey stick) to allow occasional increases to FL420. That the certified max was FL420 wouldn't have worried someone who was trying "steal" MH370 and a climb above 42,000' might have been possible - I doubt FL475 was attainable and reckon the previously mentioned radar limitations are to blame for that figure.
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