A320 Family performance retention and fuel savings(8)

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Airbus has recently launched a new software tool
speed to obtain the best overall
called AirS@vings. It is designed to provide a operating cost. Although fuel dynamic determination of the cost index under a
wide variety of operational criteria so that it can be
represents a high cost per flight it can
accurately tailored to the specifics of an airline’s
still be more cost effective overall to fly
operation on a particular route. faster, burning more fuel, because of a Point of Contact: jean-jacques.speyer@airbus.com
high cost of “time”. A cost index of zero will have the aircraft fly at its maximum range capability (i.e. most fuel efficient speed), conversely a maximum cost index will have the aircraft flying at maximum speed (i.e. minimum flight time).

The Cost Index parameter is entered into the
Reference documents
aircraft’s Flight Management System (FMS)
Getting to Grips with the Cost Index –
and may be varied to reflect the specific
Issue 2 May 1998 constraints of a given flight. Operators Point of contact: fltops.perfo@airbus.com wishing to optimize their Cost Index, either for their global operation, or for specific sectors, will need to make assessments of all relevant operating costs.  Only when this has been done can an appropriate Cost Index (or Indices) be determined.

3.2.3. FUEL ECONOMY
The following factors effect fuel consumption:
.
Cruise speed (see section on page 11 for further details)

.
Flight level (see section on page 13 for further details)

.
Flight Plan accuracy (see section on page 14 for further details)

.
Aircraft performance degradation (see section on page 15 for further details)

.
Fuel reserves (see section on page 15 for further details)

Accurate tuning of the flight planning system to the aircraft’s performance and, wherever possible, accurately flying the aircraft in accordance with the Flight Plan may only bring a small gain on each flight, but these small gains can add up to a measurable gain at the end of the year.
One important objective that is worth repeating is the building of pilot confidence in the Computerized Flight Planning (CFP). The production of an accurate flight plan will precisely
Reference documents
predict actual fuel usage and will
Getting to Grips with Fuel Economy – Issue 4 October 2004 remove any tendency by the pilot Point of contact: fltops.perfo@airbus.com to add some extra fuel reserves on top of those already calculated.
3.2.3.1. CRUISE SPEED
The cost index selected for a given flight will determine the speeds and hence the time needed to cover the journey’s distance. The speed must be optimized for the flight conditions to minimize the overall operating cost.
Realistic fuel consumption predictions can be obtained using Airbus’ Performance Engineering Program (PEP) software (refer to text box on page 13), for speeds and flight-levels as a
　
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