Fly a Boeing? Why is right rudder trim needed in cruise?

[fantom]

I'd just like to point out that Airbuses don't taxi sideways or need trim to fly straight, and all spares are genuine. Also, if you knock on the fuselage,
the B team is soft but the A team will hurt your knuckles.

[justanotherflyer]

Due to the direction of the production line, this manifests itself in microscopically curved aircraft hence the need for trim.

Ideal perhaps for accelerating along Mumbai's curved center line.

[go-around flap 15]

Funnily enough I was having this discussion with a v. knowledgable LTC last week. He suggested it was down to the design of the rudder control cables mechanism expanding/contracting with the change in temperature.