PPRuNe Forums - View Single Post - B-737 Speed Trim System
View Single Post
Old 4th Nov 2018, 16:06
  #19 (permalink)  
Rozy1
 
Join Date: May 2011
Location: Metropolis
Posts: 1,270
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by TangoAlphad
Ok.. think of it this way. It IS NOT AN AUTO TRIM.
It is not attempting to trim the aircraft for you. It is attempting to go for the last trimmed for an set airspeed and this is why it is so obvious during acceleration. It was last set 'for' 160kts but you are speeding up. It can only return to this speed by commanding some sort of nose up, i.e trim! You start manually trimming and it has a new target. You are NOT meant to be letting it trim for you. That is not what it is designed to do.

p.s the system becomes active 10 seconds after take off until mach 0.68
I don’t understand. What does attempting to go for mean if not attempting to trim the aircraft?

He who said taking the feature away would lose nothing is correct. I’ve been flying the fluf for 26+ years and I don’t appreciate the function at all. In fact, on takeoff my technique is to periodically move the left half of the trim switch, which inhibits the annoying trim from even happening.
Rozy1 is offline