Originally Posted by
bill fly
Quite right. That is normal piloting.
However if the trim should for any reason be so far out, that the elevator has too little authority to correct the pitch, it may be necessary to trim simultaneously with pulling back.
And right there, in an extreme case there can be a problem with overloading of the trim mechanism in the tail (irreversible worm drive/screw jack), which is the reason for the unloading or sea saw procedures previously promulgated in jet-upset recovery advice. And as we know unloading at treetop height - even if you know how to do it - puts you in the ground.
B
Uhh- not too sure where you get the worm drive screw jack bit - but the 737 series ( and others 767,777, etc - use a double recirculating ball " NUT " on the course threaded screw jack. Which has about a 90 percent efficiency and can therefore be back driven absent a braking system. While the electric motor MIGHT be overloaded at the extreme position (AND) and high speed, it is more likely that the manual (trim wheel- handle system ) is simply unable to produce enough torque absent superman along with the large number of turns required per degree and all by ONE person.