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That is why Airbus promotes the automatic data collection (whenever possible) for routine aircraft performance monitoring. Airbus worked this out and defined a standard report format produced by aircraft systems and a tool for analysis that is able to cope with the report without any further handling operations.
Note that both procedures should give the same results and that the choice of the method remains at the user’s discretion. Both methods are not exclusive and can be performed simultaneously and independently from each other to increase reliability of data readings.
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring

HOW TO RECORD IN-FLIGHT PARAMETERS

2. REQUIRED OBSERVED DATA
The data that is required for further analysis is given below. Each observed data set is like a snapshot of aircraft condition. As many records as possible should be obtained so as to increase the statistical adequacy of performance analysis.
Parameter  Unit  Comments 
Aircraft Tail Number  (–) 
Date  YYMMDD 
Flight Number  (–) 
Flight Case or DMU recording time  1-99  Number of data of a same flight. If no value is set, the program sets a "1". 
hhmm  Time at which the performance point was taken in flight. 
Engine serial numbers  (–) 
Altitude  (ft)  From the two air data computers (ADC) 
Mach number  (–)  From the two air data computers (ADC) 
Total Air Temperature  (°C)  From the two air data computers (ADC) 
Aircraft mass (weight)  (kg or lb) 
Center of Gravity  (%) 
Flight Path Acceleration  (g)  Horizontal acceleration measured in g. 
Vertical Velocity  (ft/min)  Vertical acceleration 
True Heading  (°)  Optional -used only if gravity correction activated. 
Latitude  (°)  Optional -used only if gravity correction activated. 
Wind speed  (kt)  Optional -used only if gravity correction activated. 
Wind direction  (°)  Optional -used only if gravity correction activated 
Average fuel temperature  (°C)  NOT ACTIVE 
Average fuel density  (l/kg)  NOT ACTIVE 
N1 -Power setting EPR - Power Setting  (%) (–)  Depends on engine type EPR for IAE, RR and P&W engines, N1 for GE and CFM engines. 
Actual fuel flow  (kg/h, lb/h)  Fuel flow for each engine (FFA1, FFA2, ...) 
Exhaust gas temperature  (°C)  To be set for each engine (EGT1, EGT2, ...) 
Fuel lower heating value  (BTU/lb) 
Engine bleed flow (left)  (kg/s or lb/s)  Engine 1 flow (twin engine A/C) or sum of engines 1 and 2 (4 engine-aircraft) 
　
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