Would you have any FCOM or any other documentary reference?
Hi 320p,
Check DSC 70-70 Actuation Logic. If you meet the actuation logic criteria, the idle will shift from modulated to reverse idle, which is slightly higher, thus decreasing landing performances. The effect is negligible if one engine is affected, hence the procedure of normal handling of reverse thrust in case of one reverse inop. It becomes of a greater impact in case of both reversers inop.