Hi Lou

After spending thousands of hours in a 707, I guess you are highly qualified to answer my question.

How accurate are the FD?

With a MTOW of about 298 000lb, the climb rate is very low when reaching a FL290 or FL310.
The VS is around 500 - 700feet/minute for the last few thousand feet.

Also the N1 reading at max CLB power at FL300 and above drops down to about 99%.  Is this correct ? (I don't use EPR as they are way out).

I would appreciate some feed back - if you have any tables or a good memory.

Thanks
sags