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Old 30th Jan 2012, 11:06
  #55 (permalink)  
Join Date: Sep 2010
Location: between the tropics
Posts: 13
How do you calculate the lowest useable flight level?

a. Lowest QNH and lowest negative temperature below ISA
b. Lowest QNH and highest negative temperature below ISA
c. Highest QNH and highest temperature above ISA
d. Highest QNH and lowest temperature

Please Help.
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