2.
Corrected FLHV (see above)
3.
air conditioning/anti ice as appropriate
4.
Fuel Consumption Factor set equal to (1+FMS PERF FACTOR(%)/100)
5.
Thrust factor set equal to 1.0
6.
Atmospheric conditions as close as possible to the actual ones
7.
Cost Index as applicable
4.2.3.2. Flight at given speed (CAS/Mach)
The Standard Flight Planning mission should be used with the following assumptions:
1.
FLHV as appropriate
2.
Air Conditioning/Anti Ice as appropriate
3.
Fuel Consumption Factor set equal to monitored fuel factor
4.
Drag factor set equal to 1.0
5.
Atmospheric conditions as close as possible to the actual ones
6.
Speeds as applicable
Flight Operations & Line Assistance Getting to Grips with Aircraft Performance Monitoring
POLICY FOR UPDATING THE FUEL FACTOR
G. POLICY FOR UPDATING THE FUEL FACTOR
1. INTRODUCTION
When implementing routine aircraft performance monitoring one of the tasks is to define some indicators and trigger conditions that may help deciding WHEN to actually change the aircraft fuel factors. The intent of this paragraph is to give Airbus recommendations to the operators updating of the Flight Planning fuel factor and the FMS PERF FACTOR. It is the operator's responsibility to implement this update procedure within its company fuel policy.
The previous paragraphs made an exhaustive review of the different ways to put these indicators into place: monitored fuel factor, monitored delta specific range… This chapter focuses on the main items that must be taken into account and illustrates this with examples coming from the field.
The following is based on Airbus experience as well as on feedback obtained from some operators.
2. STARTING OPERATIONS WITH A NEW AIRCRAFT
At delivery of a new aircraft, no data is available for this tail number to determine the required fuel factors to adjust the computerized flight planning or the FMS predictions. At delivery, it is common practice to perform a flight taking some sample points to establish fuel factors.
With these few points, an FMS PERF FACTOR and a flight planning fuel factor are determined in accordance with chapter F-Using the monitored fuel factor. The FMS and flight planning system are adjusted with these factors.
Later on, fuel factors are adjusted for each individual aircraft by means of aircraft performance monitoring. At the very beginning of the operation, an additional cross check may be performed with another method to assess the quality of the aircraft performance monitoring method.
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