"Rob Stokes" wrote in message ...
I have no proof, but looping an airliner without the passengers being aware
is not possible. Perhaps visually the passengers wouldn't notice, but
balance wise / spatially they certainly would. I have heard from many
sources that the last airliner to be taken for a loop was a B-707 after
which many of the A/C components shifted up to an inch, the pilot was
immediately disciplined! other similar instances have occurred on Russian
airliners by Ex-military pilots shortly after the war. At the Goodwood
Festival Of Speed (England) this year, there was a 'semi' aerobatic display
by a south African jumbo (consisting of very low steep turns)

Thanks for your input.
I am not an expert in flying terms so maybe it is not exactly
"looping" i heard of. The plane would drop to the left for exemple
with his longitudinal axis straight and acquire vertical speed. Then
the pilot would shift the stick right very slowly to convert this
vertical speed in a centrifugal vector. This is supposed to recreate
the same phenomemom as a pail full of water tied to a rope you turn
fast. So, as this theory goes, after the initial banking the figure
would make the passengers feel only a moderate or no increase in their
weight, the force being directed towards the floor of the plane. Since
the long axis of the plane is not disturbed no other noticeable
effects should appear...

But if it is unheard of, it may well be purely theorical or simply an
urban legend!