F$_{N}$ = Fuel allocated to the international flight under consideration (i.e. flight $_{N}$) using the Fuel Allocation Block Hour method (in tonnes); 

AFBR$_{AO,AT}$ = Average fuel burn ratios for aeroplane operator (AO) and aeroplane type (AT) (in tonnes per hour)( a )( b ); and 

BH$_{AO,AT,N}$ = Block hour for the international flight under consideration (i.e. flight $_{N}$) for aeroplane operator (AO) and aeroplane type (AT) (in hours). 

(6) A verification body must cross-check whether the emissions reported are reasonable in comparison to other fuel related data of the aeroplane operator. 

## CO$_{2}$ emissions estimation and reporting methods and tools 

## SCHEDULE 3 

Article 70(3) 

## Introduction to the ICAO CORSIA CO$_{2}$ Estimation and Reporting Tool (CERT) 

1.  The procedures specified in this Schedule are concerned with the estimation of CO$_{2}$ emissions by an aeroplane operator for the purposes of monitoring CO$_{2}$ emissions and filling data gaps. The methods and tools proposed are representative of most accurate established practices. 

## Use of the CERT for complying with monitoring and reporting requirements 

2. —(1) The aeroplane operator must use the CERT according to the eligibility criteria as described in article 22 of this Order and upon approval by the Regulator. 

(2) The aeroplane operator must use either— 

(a) the Block Time input method, or 

(b) the Great Circle Distance input method, 

to enter the necessary information into the CERT. 

(3) The aeroplane operator approved to use the Block Time input method— 

(a) must collect the following data and must enter it into the CERT to estimate its CO$_{2}$ emissions during the compliance year— 

(i) ICAO aircraft type - model designator( c ), 

(ii) origin aerodrome ICAO Designator( d ), 

(iii) destination aerodrome ICAO Designator( e ), 

(iv) Block Time (in hours), and 

(v) number of flights, 

(b) may collect the following data and, if collected, must enter it into the CERT to estimate its CO$_{2}$ emissions during the compliance year— 

(i) date, and 

