Method of controlling a combustor

A method of controlling a combustor of a gas turbine engine, the combustor being supplied a total fuel quantity dependent on a load of the gas turbine engine, the total fuel quantity is split into a pilot fuel quantity and a main fuel quantity via a pilot fuel split, the pilot fuel split is a percentage of the pilot fuel quantity to the total fuel quantity, wherein the method comprises:

• monitoring at least one signal of at least one condition of the gas turbine engine,
• generating a steady state value of the at least one signal, wherein the steady state value of the at least one signal is indicative of a steady state of the gas turbine engine,
• detecting a change in the steady state value, the detecting occurring when the change in the value exceeds a predetermined limit,
• generating transient pilot split offsets for the pilot fuel split from a look-up table, and
• applying a transient pilot split offset from the generated transient pilot split offsets to the pilot fuel split while maintaining the total fuel quantity being supplied at any point in time,
• wherein, when the change in the steady state value comprises a reduction from a peak value the transient pilot split offset is gradually reduced to a zero value,
• wherein the gradually reducing of the transient pilot split offset comprises a maximum reduction rate with a first maximum rate of reducing and a second maximum rate of reducing, wherein the first maximum rate of reducing is greater than the second maximum rate of reducing the transient pilot split offset.