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Guest tomahawk_pa38

OAT and ISA Dev/QNH

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Guest tomahawk_pa38

Two things that pzzle me which don't appear to be well covered in the FMC Manual or tutorials.1.What do I put in the OAT box - at the moment I guess at -50F for something like FL350 - are there any charts / graphs to give more info please ?2. What does the ISA Dev/QNH box do ? is it modelled ? The FMC Manual (page 73) just says that it is the 'Destination airport temperature deviation from standard.." So do you put in the destination temp or the difference between what (The departure airport or the OAT ) and the destination airport. What logic do you use if the dest temp is 10 degrees cooler, do you put in '10' or 'minus 10'?

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