The Gundam F91’s high performance is not without drawbacks; its full operating mode is too much for normal pilots to handle. Thus, limiters were installed to make the suit more manageable; only a Newtype pilot can handle the full operating mode. When the Bio-Computer - via the Bio-Sensor in the pilot’s linear seat - determines that a Newtype is at the controls, it will disable the limiters and allow activation of the full operating mode. In this mode, the suit performs at its maximum potential and forced cooling is activated. This results in the suit radiating heat from all over its body: the face guard opens to vent heat, the shoulder-mounted heat radiations fins are deployed, the retractable thruster units on the back of the lower legs and the associated fins are activated, and the MEPE phenomenon occurs. All these are to reduce damage to the machine caused by movement overload during the full operating mode, and to protect the Bio-Computer that is sensitive to high heat. It is also worth noting that the front grill that takes up most of the chest and abdomen is a heat sink.