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Engine noise

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EHM-1001 Robert:
Unfortunately I did not care about the time so I cannot repeat the observation ;D

It can be an old engine but not that old, because after the louder "intro" it continues as a normal A320 or 737NG roaring.

At Budapest the only regular B747 visitor is a Cargolux 747-400F. It is very impressing as climbing slowly and have a very distinctive engine noise - for me (being an engineer) it sounds exactly like a scrap machine with worn and damaged bearings... but not ! It is normal at the 747 with RR power ;D

EHM-1001 Robert:
I heard it again, and I have 2 tips: either a Fokker 70 (having a lot in the area) or either an MD8x, as both have "old"' low-bypass turbines. I think the phenomenon appears in hot but windy weather. I will take care of it next time, maybe I will be lucky ;)

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