Comet4b From Canada, joined Jun 2006, 61 posts, RR: 0 Posted (8 years 3 months 3 weeks 6 days 16 hours ago) and read 1410 times:
This will probably be one and only post so here goes.
When flying back to YYZ on a Mexicana A319 I became aware of the aircraft gently oscillating around the main longitudinal axis.I only noticed it when looking out the window at the horizon.and observed the wing going up and down.This continued over about 4 hours of the flight.In all my 40 years of flying I have never observed this before.Unfortunately I have not flown since(snow not due for about 2months then its off to BKK) when I will be observing
this again.I am hoping one of the flight crew members can explain this .
Thank you in advance for any replies.
Charliejag1 From United States of America, joined Aug 2006, 241 posts, RR: 0
Reply 2, posted (8 years 3 months 3 weeks 6 days 15 hours ago) and read 1304 times:
Sounds a little like dutch roll, but not really. You wouldn't expect a whole lot of dutch roll on an a319, especially if the yaw damers were working correctly. Did you notice the plane yawing also? If so, it was probably dutch roll, maybe they had a MEL for a yaw damper. Otherwise, nothing jumps to mind . . .
474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 3, posted (8 years 3 months 3 weeks 6 days 11 hours ago) and read 1164 times:
I would say the ailerons are out of rig. This causes the autopilot to constantly reposition them. The autopilot lowers the aileron that is too high, to raise the wing. However, this makes the opposite aileron to low, so it raises it to lower the wing, that will go on until the system is rigged correctly.