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(b) has been found to be incorrect under the data monitoring methodology applied previously, 

(c) would improve the accuracy of the reported data, unless this is technically not feasible or incurs unreasonable costs, or 

(d) is necessary to respond to the suggestions for improvement of the monitoring plan contained in a verification report. 

(5) An aeroplane operator must also inform the Regulator of changes that would affect the Regulator’s oversight, such as a change in corporate name or address, even if the changes do not fall within the definition of a material change( a ). 

## Approval of modification of the Emissions Monitoring Plan 

27. —(1) A Regulator may allow an aeroplane operator to notify modifications of the Emissions Monitoring Plan that are not significant. 

(2) Any significant modification of the Emissions Monitoring Plan must be subject to approval by a Regulator. 

(3) Where the Regulator considers a modification not to be significant, it must inform the aeroplane operator without undue delay. 

(4) Significant changes to the Emissions Monitoring Plan include— 

(a) change of emission factor values laid down in the Emissions Monitoring Plan, 

(b) a change between the calculation methods referred to in Schedule 2, 

(c) the introduction of new source streams, 

(d) changes in the status of the aeroplane operator with regard to one of the thresholds specified in article 5 or 22(7) to (12). 

## Calculation of CO$_{2}$ emissions from aeroplane fuel use 

28. —(1) An aeroplane operator must apply a fuel density value to calculate fuel mass where the amount of fuel uplift is determined in units of volume. 

(2) The aeroplane operator must record the fuel density, which may be an actual or a standard value of 0.8 kg per litre, that is used for operational and safety reasons such as in an operational, flight or technical log. 

(3) The procedure for informing the use of actual or standard density must be detailed in the Emissions Monitoring Plan along with a reference to the relevant aeroplane operator documentation( b ). 

(4) An aeroplane operator using a Fuel Use Monitoring Method, as set out in Schedule 2, must determine the CO$_{2}$ emissions from international flights using the following equation— 

<img src='content_image/617271.jpg'>

where— 

