I am sorry, before even spell check and complete my writing suddenly , all goes to post.
This is my third attempt"


"For a long time I didn't have any problem with Trim settings.In recent flights, after  calculating V speeds. I select MAC% & Trim setting . After EPR settings completion, I gave power. Climb to 1500 clean flaps, I check trim setting it goes to "0" with AP is OFF. 1500 ft connect the AP. I maintain 250KN
727 STARTS SHARPLY  climb, trim remain "0" 727 pitch over 20 Degrees, then goes below trim move below "0" 727 STARTS dive. I disconnect AP and recover the plane.

Why trim keep giving me a problem

Posted by: asanal