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A comment on Southwest Airlines Boeing 737-8 Max Experienced Dutch Roll. Parent comment

Re:Southwest Airlines Boeing 737-8 Max Experienced Dutch Roll by belter on Thursday June 13, 2024 @08:27AM (#40668807)
The FAA reported: "AIRCRAFT EXPERIENCED A DUTCH ROLL, REGAINED CONTROL AND POST FLIGHT INSPECTION REVEALED DAMAGE TO THE STANDBY PCU, OAKLAND, CA." and stated the aircraft sustained substantial damage, the occurrence was rated an accident.
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Re:Southwest Airlines Boeing 737-8 Max Experienced Dutch Roll by HPsquared on Thursday June 13, 2024 @08:40AM (#40668944)
Standby PCU sounds like a control system. Was that a cause or effect of the event?
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Re:Southwest Airlines Boeing 737-8 Max Experienced Dutch Roll by banannaise on Thursday June 13, 2024 @09:00AM (#40669106)
The PCU in this context is the part that moves the rudder. PCU issues were common on the 737 in the 90s[0] although that's... probably?... not relevant here.

[0] https://en.wikipedia.org/wiki/Boeing_737_rudder_issues

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Re:Southwest Airlines Boeing 737-8 Max Experienced Dutch Roll by HPsquared on Thursday June 13, 2024 @09:13AM (#40669250)
Exactly, rudder control issues could trigger or exacerbate Dutch roll. Loss of yaw damper control, in other words (yaw damper actuates the rudder).
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