The Air Navigation (Carbon Offsetting and Reduction Scheme for International Aviation) Order 2021

Method A

3.—(1) The aeroplane operator must use the following formula to compute fuel use according to Method A(1)—

where—

• F_N = Fuel used for the flight under consideration (i.e. flight _N) determined using Method A (in tonnes);

• T_N = Amount of fuel contained in aeroplane tanks once fuel uplifts for the flight under consideration (i.e. flight _N) are complete (in tonnes);

• T_N+1 = Amount of fuel contained in aeroplane tanks once fuel uplifts for the subsequent flight (i.e. flight _N+1) are complete (in tonnes); and

• U_N+1 = Sum of fuel uplifts for the subsequent flight (i.e. flight _N+1) measured in volume and multiplied with a density value (in tonnes)(2).

(2) The aeroplane operator performing on an ad-hoc basis flights attributed to another aeroplane operator must provide to the latter the fuel measurement values according to the Block-off/Block-on method.

(3) Where no fuel uplift for the flight or subsequent flight takes place, the amount of fuel contained in aeroplane tanks (T_N or T_N+1) must be determined at block-off for the flight or subsequent flight. In exceptional cases the variable T_N+1 cannot be determined. This is the case when an aeroplane performs activities other than a flight, including undergoing major maintenance involving the emptying of the tanks, after the flight to be monitored. In such case the aeroplane operator may substitute the quantity “T_N+1 + U_N+1” with the amount of fuel remaining in tanks at the start of the subsequent activity of the aeroplane or fuel in tanks at Block-on, as recorded by technical logs.

(1)

See Attachment C-1 in Volume IV of Annex 16 to the Chicago Convention for a process diagram for monitoring fuel use by flight using Method A.

(2)

See article 28 for requirements on fuel density values.