No, not at all.
If the loadsheet says less than 27 you need to apply the "below 25" method. Two ways to do that
1) Use RTOW chart (based on 25+) and apply the conservative decrement (2 deg FLEX, 1000 kg IIRC)
2) Recalculate using the OCTOPUS core in whatever software form you have access to
such as
- PEP to print new RTOW charts based on the forward "extended" envelope
- Mainframe via ACARS to make new calculations with EXTENDED mode
- iPad / PC based FlySmart SW - make selection "< 25%"
You are reading too much into it. Forget about the difference between 27 and 25, inside it is the same number and references the same limit
Your AFM quote explains how to obtain certified figures for extended CG envelope range.
The FCOM note advises how to deal with <27 loadsheet in case you only had RTOW charts for 25% or more aft (while you do not have the tools at hand to follow the AFM guidance and recalculate with the EXTENDED option).
-->> One is the certification and flight test language of AFM, the other is the operational fuzzy measurement of FCOM. Safelife explains above well.
(normally there are no RTOW charts for the extended envelope, of course).
One is the certification and flight test language of AFM, the other is the operational fuzzy measurement of FCOM. Safelife explains above well.
Last edited by FlightDetent; 6th May 2019 at 06:03.