As stated in the article entitled Fuel - In-Flight Management (Normal Operations) fuel management encompasses pilot responsibilities for verification, utilisation, monitoring, recording and reconciliation of the fuel loaded on the aircraft. In the context of this article, abnormal operations include dispatch under Minimum Equipment List (MEL) or Configuration Deviation List relief, fuel leak, inflight failures or planned flights in a non-standard configuration such as a gear down ferry flight. Under abnormal operations, fuel management becomes more difficult as the tools normally used for fuel monitoring, such as FMS predictions and flight plan comparison, may be invalid or misleading. An additional level of vigilance is required.