VERTICAL Stabilizers nose up? HUH? It would be the horizontal stabilizer not VERTICAL.
IF you are slowing for approach, the trim is more nose up ...that simple.
if someone would like to summerize what is really KNOWN as of now...that simplifies the thread.
someone did say something about zig zagging...could it be the result of ONE engine going out and the crew not responding correctly?
we all train for engine out on takeoff...but engine out in descent/approach can be very tricky if you aren't UP for it.