Reply To: Trim in the PMDG NGX

[jackz]

Dear Diego

You probably know that contrary to General Aviation airplanes, on nearly every commercial airplane be it Jet or prop, the control forces are (thankfully) completely irreversible.
The forces are so heavy they couldn’t be overcome by hand and the plane would be unflyable. The hydraulics are set in a way that the forces applied to the control surfaces (such as the weight of rudder) are no longer transmitted to the pilot.

So there is an artificial feedback force applied on the Yoke which is part of the JAR25/EASA Certification, including Stick shaker and stick pusher features if needed.
Here’s an excerpt of the JAR 25 certifcation requirements stating the forces to be applied on large aircrafts (see page 16).
CONTROLLABILITY
AND
MANOEUVRABILITY
http://www.southampton.ac.uk/~jps7/Aircraft%20Design%20Resources/Certification%20safety%20reliability/jar%2025%20large%20aircraft.pdf

best regards

Jacques