Flight Log aLTITUDES


#1

Sometimes the altitudes in the flight log alt column show a strange variation. For example on descent, it may show 40,000, 36,000, 25,000, 12,000 showing a progressing descent, then an instant jump up to 30,000, followed by the rest of the descent profile. 8,000 for example, and maybe another spike to a higher alt before the descent resumes normally again. What causes this? Thanks. Tom


#2

Essentially, ATC clears them to that ‘jump’ altitude at that point.


#3

As state elsewhere in this forum, what happens is that ATC radar loses the altitude of the aircraft. It substitutes the filed altitude.

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Here is one such discussion


#4

I always figured that the altitudes were actually mode C reported altitudes, not ATC cleared altitudes, and that strange deviations were a result of reporting errors…


#5

Thanks for the help. Regards, tom