Gas turbine engine with a low speed spool driven pump arrangement

A gas turbine engine, comprising:

• a propulsion assembly including at least a high pressure turbine and a low pressure turbine, the turbines being situated to rotate about an engine central axis, operation of the propulsion assembly requiring at least one fluid including requiring a first amount of the fluid during at least a first operating condition and a second, greater amount of the fluid during at least a second operating condition;
• a low speed spool configured to rotate about the engine central axis with the low pressure turbine;
• a first pump that is operatively associated with the low speed spool such that operation of the first pump is dependent on rotation of the low speed spool, the first pump having a first fluid delivering capacity configured to correspond to at least the first amount;
• and
• a second pump having a second fluid delivering capacity configured to correspond to at least a difference between the first amount and the second amount;
• the first pump providing the fluid for propulsion assembly operation during the first and second operating conditions and the second pump providing the fluid for propulsion assembly operation only during the second operating condition.