Hi everyone,
in a B747 i always take off with the autothrottle set on SPD 250 up to 10,000 ft. After 10,000 ft to FL20 i set it to 280, then FL20-30 300, FL30+ 320.
I know this isn't how a real pilot would do it, but can anyone tell me the speed or altitude cross over point were a pilot would switch from spd to mach??
many thanks
KB
4 Answers
Chief CaptainI usually set cruise speed (in mach) at around FL280 for the ascent and then change back to KIAS below FL280.
Chief CaptainI set it at FL250, just because i like to get goign fast as soon as possible.
Chief CaptainKool Bus wrote:
Hi everyone,
in a B747 i always take off with the autothrottle set on SPD 250 up to 10,000 ft. After 10,000 ft to FL20 i set it to 280, then FL20-30 300, FL30+ 320.
I know this isn't how a real pilot would do it, but can anyone tell me the speed or altitude cross over point were a pilot would switch from spd to mach??
many thanks
KB
This depends on several factors such as weight, climatic conditions and of course the procedures stipulated by the airline.
I change from speed to mach when I change from area QNH to ISA and vis versa.
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