During certification belly landing is assessed for crasworthiness. It includes various configuration of retracted/extended landing gears (nose etc.). Purpose is to minimise the risk of fire by controlling to the maximum extent the amount of flammable fluid that could be released, by ensuring both structural integrity and/or proper location of components carrying or containing flammable fluids.
The normal assumption is however the crew will not try to take off after a belly landing. This was generally verified in service - until now. Most procedures recommended pulling the fire handles just before the landing/impact; there has been some debate because it may affect hydraulic generation and cause flight control issues.
So, no demonstration the propulsion system will run after a belly landing, and no performance calculation!
Last edited by armagnac2010; 7th Jun 2020 at 23:51.
Reason: Typos