I’m concerned about Boeing aircraft safety design flaws because it is so disturbing to see so many lives lost in aircraft accidents. I’ve attempted to contact Boeing about this. But officially they can’t be bothered by public suggestions or questions. I also read that since a design flaw can expose Boeing to law suits, they hide such information by emphasizing an alternate reason for a crash such as that on the Indonesia flight JT610.
The fundamental design problem is that the aircraft can force the nose down without allowing the pilot to pull up (totally independent of pilot control). In response, Boeing claims that the pilot needs to read the instruction manual to correct this. But if the pilot is diving into the sea at 450MPH he really doesn’t have time to read the manual.
Lane control in a new Toyota Prius causes the car to be gently nudged back into a lane if the car deviates excessively. But if it totally took over steering control with a defective lane position sensor, the result would be catastrophic. Similarly, if the aircraft pitch control takes over by relinquishing pilot control, the same problem would occur.
A simple correction would eliminate this problem which should have been applied before carrying passengers as detailed below.
The horizontal stabilizer has a front jack screw and a rear fulcrum with the elevator hinged to the rear of the stabilizer. Moving the yoke back moves the elevator up (tail down, nose up). The stabilizer is then trimmed either manually or automatically to reduce yoke forces sensed by the pilot but incorrectly if the AOA sensor is defective.
If the stabilizer is too high as a result of erroneous AOA sensor input, the plane dives into the sea unless the pilot reads the manual (as claimed by Boeing).
To correct this major problem, can a switch be added which senses back yoke force so as to move the stabilizer down (nose up) independently of any other stabilizer inputs preventing the uncontrolled dive?