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Plane Oscillation  
User currently offlineComet4b From Canada, joined Jun 2006, 61 posts, RR: 0
Posted (9 years 9 months 1 week 12 hours ago) and read 1508 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.

3 replies: All unread, jump to last
User currently offlineThrottleHold From South Africa, joined Jul 2006, 739 posts, RR: 1
Reply 1, posted (9 years 9 months 1 week 11 hours ago) and read 1441 times:

Never seen it happen on the Airbus, but the 747 Classic does it all the time. Generally, it wallows around like a walrus anyway in cruise! No idea why, probably just the old tech in the autopilot.

User currently offlineCharliejag1 From United States of America, joined Aug 2006, 241 posts, RR: 0
Reply 2, posted (9 years 9 months 1 week 11 hours ago) and read 1402 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 . . .

User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 3, posted (9 years 9 months 1 week 8 hours ago) and read 1262 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.

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