CRUISING AT FLIGHT LEVEL AND FMC ENTRIES
Today I decide to return to Aerowinx using the exercise Basic013 Climbing to cruising level.situ. Which was a great return exercise after having not flown for many months.
When I leveled out at both FL310 (31,000 feet) and FL330 (33,00 feet) I noticed how quickly the wind direction changed at these levels which must have really occurred as the file is based on a real Singapore Airlines Flight (SQ47) flown back in 2014 between Anchorage Alaska, and Schipol Airport in Amsterdam, Holland.
I have two questions. The flight is managed by the FMC (Flight Management Computer) by whichever pilot has command so:
1. Does the PNF (Pilot Not Flying) who monitors the systems have to update the Wind Data on the FMC every time their is a change of direction with the wind; sometimes every two minutes?
2. I calculated an OAT (Outside Air Temperature) as a measure of density of the air by applying the International Standard Atmosphere used for every calculation of 15C - (31x2=64) as Temperature drops by 2 degrees C per thousand feet leaving a result of 64-15 = -49 degrees C (Centigrade) which is then entered into the FMC as Flight level FL310 and an Outside Air Temperature of -49C so the aircraft can cruise at its most efficient Thrust settings. Is this correct?
The Screenshot is of the early morning sunrise having flown over the ocean all night and accurately reflects what aircrew & visitors to the flight deck would see.
I look forward to your responses.
May all your landings br safe ones,
Neil
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