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Looking back on engineering and test (before paint and upholstery), the 4P flight control system must have been designed for an ES or IV(sans P), and pressurization added later. Otherwise, priorities are out of order. It is fairly unusual to have cabin pressurization influence trim and control stiffness. We generally start to notice it at high altitude( > FL180), especially in a higher speed enroute descent, where aero loads add to the feedback of heaviness, especially on the roll control.
Anybody look at fixing this? Fly by wire? Fly by light?
Occam says a rotating bearing might achieve a better seal and force transfer mechanism that a push pull with bellows, compensating pistons, attached to a counter pressure hose!
But then, Hydraulic connections(across pressure bulkhead) might be better in
a retro-fit, and permit feedback for both trim, fly by wire, and autopilot,
R/ Bill
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