A Southwest Boeing 737 Max experienced a rare but serious 'Dutch roll,' and has now been out of service for 2 weeks

• A Boeing 737 Max has been out of service since May 25.
• The Southwest Airlines jet encountered a rare stability problem called a Dutch roll.
• A post-flight inspection found damage to the power control unit, which controls the rudder.

A Boeing 737 Max has been out of service for 20 days as officials investigate an in-flight incident.

The Southwest Airlines jet was flying from Phoenix to Oakland on May 25 when it ran into a rare but potentially serious problem.