Originally Posted by Turbavykas
I looked at 2010 Boeing 737NG and CL manuals. NG manuals doesn't have any graphs at all. CL still has 1 but very simple graph.
FCOM performance is advisory only - the real data lies in the AFM, where you find as many charts as you want to find - especially with multiple derates available.
OPS 1.475
...
(b) An operator shall ensure that the approved performance Data contained in the Aeroplane Flight Manual is used to determine
compliance with the requirements of the appropriate Subpart, supplemented as necessary with other data acceptable
to the Authority as prescribed in the relevant Subpart. When applying the factors prescribed in the appropriate
Subpart, account may be taken of any operational factors already incorporated in the Aeroplane Flight Manual performance
data to avoid double application of factors.
(my bold)
Originally Posted by Turbavykas
I find myself much easier to use tables. I assume it's also safer.
Easier to use - sure. Safer? Debatable. For example, if the climb limit weight in the FCOM is 63.1 - how do you know if it's 63050 kg or 63149 kg? 99 kg may be one passenger with luggage you will have to offload, because you're not sure if you can satisfy the certification performance requirements.
The
real tables (not that FCOM crap) are usually created by companies, which are specialized in aircraft performance. They take the data from the AFM graphs and convert it into so called airport analysis chart, which give you the PLTOM (performance limited take-off masses) for a given runway and many possible weather (wind, OAT), configuration (bleeds, anti-ice, flaps) conditions - but they are rounded to 1 kg, not 100kg, therefore very precise (not to be believed like they were sent from God himself though).