2.3. The input data
This paragraph details the input, which the APM program needs for cruise
performance analysis.
Following is a reference table for cross-checking that all required parameters can
be accessed easily.
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
CRUISE PERFORMANCE ANALYSIS
Label Parameter Unit Comments Influence on the result
AILNO Aircraft Tail Number (–) None
DATE Date YYMMDD None
FLNO Flight Number (–) None
FCASE Flight Case or DMU/FDIMU recording time 1-99 Number of data of a same flight. If no value is set, the program sets a "1". None
hhmm Time at which the performance point was taken in flight. None
ESN Engine serial number (–) None
ALT Altitude (ft) From the two air data computers (ADC)
MACH Mach number (–) From the two air data computers (ADC)
TAT Total Air Temperature (°C) From the two air data computers (ADC)
MASS Aircraft mass (weight) (kg or lb) Impact on DFFA
CG Center of Gravity (%) Impact on DFFA
FPAC Flight Path Acceleration (g) Horizontal acceleration measured in g. Impact on DFFA
VV Vertical Velocity (ft/min) Vertical acceleration
THDG True Heading (°) Optional - used only if gravity correction activated.
LAT Latitude (°) Optional - used only if gravity correction activated.
CWI Wind speed (kt) Optional - used only if gravity correction activated.
DWI Wind direction (°) Optional - used only if gravity correction activated
AFT Average fuel temperature (°C) NOT ACTIVE None
AFD Average fuel density (l/kg) NOT ACTIVE None
REG N1 - Power setting EPR - Power Setting (%) (–) Depends on engine type EPR for IAE, RR and P&W engines, N1 for GE and CFM engines.
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
CRUISE PERFORMANCE ANALYSIS
FFA Actual fuel flow (kg/h, lb/h) Fuel flow for each engine (FFA1, FFA2, ...) Impact on DFFB
Label Parameter Unit Comments Influence on the result
EGT Exhaust gas temperature (°C) To be set for each engine (EGT1, EGT2, ...)
FLHV Fuel lower heating value (BTU/lb) Impact on DSR
WBLL 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) Impact on DFFA
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