I have noticed that when the first officer doing his before start checks he always sets the trim different from what the FMC is calling for. The V Speeds are correct so I am not sure why this data isn't matching.

It's very difficult for us to accurately move the trim wheel.  It's hit and miss.  Sometimes it's close.  Sometimes it's not.

In V1.1, I'm going to add an option to make FO control of the trim setting for TO a user option.

 

Okay. It isn't a big deal either way, I was just wondering why that was happening. Thanks.

Hi Bryan... and Happy New Year!

I'm using button control.

I set myself the trim. For my flights it is usually beetween 5.4x and 5.5x. (x being a second decimal).

At the "STAB TRIM -SET" stage, the Captain always says "six point zero unit".

Is that normal, taking into account the difficulty you mentioned above?

Is that related to what is said in the manual:

Note: The Stabilizer trim will only accept a trim setting to one decimal place. So 5.0 Units will work,
but not 5.55 units. You are supposed to be looking at the trim handle, not the CDU for the trim
setting.

I do not quite understand that because, for me, the FMC indicates a 2 decimals trim value. And so does the trim wheel.

 

 

We can't read stab trim very well due to SDK limits, so the number is approximate based on the crude data we an read for the Stab trim.

Cheers,

 

Thanks Bryan, clear.