Hey all,

 

I have a question regarding the stabilizer trim settings, and the differences between the -700 and the -800. When I fly the -700 with the trim setting per the CDU I generally don't need to give a lot of elevator input to accelerate after take off. When I fly the -800 with the trim setting per the CDU, I need to give almost full down elevator deflection and then add a significant amount of down trim to accelerate. Is this the correct behavior?

 

Part of me thinks the answer(s) are:

 

1.) The -700 is an apple, the -800 is an orange, therefore you are comparing apples to oranges.

2.) You are doing it wrong.

 

Another part of me thinks the answer is a combination of 1 & 2. Any input/feedback would be greatly appreciated.

 

Thanks!

 

Mike Murphy

I'm just going to guess that you aren't doing something right. Full forward pressure PLUS adding in good amounts of trim should not be needed to fly at a reasonable attitude.

You use trim setting from CDU only for take-off, in flight you set your trim using your feeling of control column.

What speed are you trying to climb out at? That could be your problem...

Hey all,

 

I have a question regarding the stabilizer trim settings, and the differences between the -700 and the -800. When I fly the -700 with the trim setting per the CDU I generally don't need to give a lot of elevator input to accelerate after take off. When I fly the -800 with the trim setting per the CDU, I need to give almost full down elevator deflection and then add a significant amount of down trim to accelerate. Is this the correct behavior?

 

Part of me thinks the answer(s) are:

 

1.) The -700 is an apple, the -800 is an orange, therefore you are comparing apples to oranges.

2.) You are doing it wrong.

 

Another part of me thinks the answer is a combination of 1 & 2. Any input/feedback would be greatly appreciated.

 

Thanks!

 

Mike Murphy

I use only the -800 but never have to correct pitch in such manner. Sure everything is calibrated well?

 

Bert Van Bulck

Thanks! I'll try recalibrating.

Typically, an airplane should climb at about V2+20 in T/O trim without any control pressure. Make sure your weights are all set and you are using correct speeds for your weight and flap setting.