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Old 12th February 2013 | 11:55
  #11 (permalink)  
Stuck_in_an_ATR
 
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From the FCOM:

RECOMMENDED MAXIMUM ALTITUDE (REC MAX)

The recommended maximum altitude is the lowest of the maximum altitude that:
    So, it's not only about buffet margin, but also performance-related. My guess is that with lower CI the a/c flies at lower speed, thus is able to maintain it (or climb) using less thrust - hence higher REC MAX FL...
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