It's allowable under the mel as follows:
32-15 CENTRELINE GEAR
15-01 Centreline Gear
May be inoperative in retracted
position provided the MTOW and the
MLW are limited as follows:
MTOW : 230,000 KG
MLW : 185,000 KG
Note : The centreline gear may be
deactivated in retracted position with
or without the wheel assemblies
fitted. Consider weight saving of 300
KG with wheels removed.