The OEM "shortest time to reach" EMERG DESC technique does not include L/G down.
The difference you see is most likely that:
- it was not flight-tested certified so it must not be in AFM
- people kept asking, thus Airbus calculated a value and wrote it in the FCOM.
The differences in legal meaning of AFM vs. FCOM vs. Company Approved Operating manual may differ across continents.
Last edited by FlightDetent; 8th May 2018 at 21:24.