A added note the trimming function is with the A/T switch in "arm" they still trim using manual thrust.
Also I "played" around with the trim function some time ago with SPD / LNAV / VNAV PTH and say an EPR of 1.44 (RR), pushed number 2 up got 1.45 then watched it trim it back to 1.44 meanwhile the entire 4 thrust levers move ever so slightly back a bit, did this a number of times until as stated around 1/2 knob (think it was a bit more from memory) number two stayed at 1.45 others still 1.44, moved it further forward say 1.48 entire pack keep moving to reduce the average thrust including number 2 which had to be pushed again to maintain 1.48 the rest settled at 1.43 then took number 3 engine and moved it just like #2, the 3 engines trimmed, can't remember what happened after it was outside 1/2 a knob.
Last edited by SMOC; 10th May 2009 at 05:47.