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Adjustable atmospheric conditions -All Air Conditioning settings available -All Anti Ice settings available
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Adjustable FLHV -Adjustable thrust factor (modification of the maximum thrust/N1/EPR at a given
thrust rating) -Adjustable fuel consumption factor
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
USING THE MONITORED FUEL FACTOR
4.2.1.2. FMS Flight Planning Calculations performed with this mode are based on the databases stored in the
FMS (FMS Perf Data Base or PDB) and on simplified equations used therein (due to the real-time constraints).
For a given cost index and fuel factor, speeds given in this mode are thus the same as those flown by the aircraft in identical conditions. The fuel consumption may be slightly different from the ones actually observed, since there are some simplifications, like the assumption of low air conditioning and no anti ice whatever the actual bleed flow. Another restriction: only flight conditions that can be flown under FMS managed mode by the crew are available for computation.
This calculation mode is based on: -Simplified IFP aerodynamic and engine database (FMS aircraft performance level) -Simplified IFP algorithms for data extraction and flight mechanics equations consistent with the ones implemented in the FMS -Data and algorithms for flight guidance parameters and limitations consistent with the FMS ones
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Adjustable atmospheric conditions -LO/ECON air conditioning only, no anti-ice, as the FMS predictions
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Adjustable FLHV
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Adjustable thrust factor -Adjustable fuel consumption factor
4.2.1.3. Standard Flight Planning with FMS speeds This mode uses a mix of the two previous database sets in order to obtain the best of both worlds: the actual FMS speeds and accurate fuel consumption predictions under given conditions. For example, you may calculate data for any bleed setting
available on the aircraft. The FMS managed mode is equivalent to a calculation in standard mode.
This calculation mode is based on:
-Standard IFP aerodynamic and engine database (same as book level)
-Standard IFP algorithms for data extraction and flight mechanics equations
-Data and algorithms for flight guidance parameters and limitations consistent
with the FMS ones
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Adjustable atmospheric conditions -All air conditioning settings available -All anti ice settings available
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