USING THE MONITORED FUEL FACTOR
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
-
Adjustable atmospheric conditions -LO/ECON air conditioning only, no anti-ice, as the FMS predictions
-
Adjustable FLHV
-
Adjustable drag factor -Adjustable fuel consumption factor
4.1.1.3. hybrid mode (standard 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. For the flight phases being covered, this mode is ideal for flight plan performance data production. The ones not covered are usually flown in FMS selected or manual mode (single engine performance, gear down...). The
FMS managed mode is equivalent to a calculation in standard mode (holding at green dot speed...).
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
-
Adjustable atmospheric conditions -All air conditioning settings available -All anti ice settings available
-
Adjustable FLHV
-
Adjustable drag factor -Adjustable fuel consumption factor
4.1.2. Simulation of the FMS predictions
The intent of this paragraph is to explain how to use the IFP program to reproduce FMS predictions on board the aircraft.
4.1.2.1. Flight at given Cost Index The IFP FMS mode should be used with the following assumptions:
1.
FLHV set equal to 18400. BTU/LB (as in the on-board FMS)
2.
LO/ECON air conditioning
3.
Fuel Consumption Factor set equal to (1+FMS PERF FACTOR(%)/100)
4.
Drag factor set equal to 1.0
5.
Atmospheric conditions as close as possible to the ones used by the FMS
6.
Cost Index as applicable
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
USING THE MONITORED FUEL FACTOR
4.1.2.2. Flight at given speed (CAS/Mach) This type of calculation is only possible for the CRZ and DES phases. No similar
calculations can be performed for the CLB phase as the IFP FMS calculates the climb Mach depending on the Cost Index entered.
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