getting to grips with the

cost index
Issue II - May 1998

Flight Operations Support & Line Assistance
Customer Services
1, rond-point Maurice Bellonte, BP 33 31707 BLAGNAC Cedex FRANCE Telephone (+33) 5 61 93 33 33 Telefax (+33) 5 61 93 29 68 Telex AIRBU 530526F SITA TLSBI7X

getting to grips with

cost index
Issue II - May 1998

 Flight Operations Support & Line Assistance
STL 945.2369/98 May 1998 – Issue 2

TABLE OF CONTENTS

1.  
PREAMBLE...................................................................................3

2.  
INTRODUCTION : COST INDEX DEFINITION AND DETERMINATION ....................5

2.1 Trip cost
2.2 Time-related costs
2.3 Cost index calculation
2.4 Variation of airline practices

3.  
COST INDEX TABLES..................................................................9

3.1 A300/A310 Family
3.2 A320 Family
3.3 A330/A340 Family
(a)
 Cost index brackets

(b)
 A340 specific range versus Mach

(c)
 Recalibrating the cost index

(d)
 Transforming cost index brackets

3.4 Basic options with the cost index concept

4.  
TRIP COST PENALTY AS A COST INDEX FUNCTION ............ 15

4.1 Trip cost variations at fixed fuel cost
4.2 Trip cost variations at fixed time-cost

5.  
CLIMB PERFORMANCE VERSUS COST INDEX......................20

5.1 Cost index - climb profile relationships
5.2 Variation of climb parameters with the cost index
5.3 A340 practical case

6.  
OPTIMUM ALTITUDE FOLLOW-UP...........................................27

6.1 Trade-off between manoeuvrability and economy
6.2 Cross-over altitude versus optimum altitude
6.3 Best cost strategy : A340 application
(a)
 Climb capability

(b)
 Cost factor in the choice of optimum altitude

7.  
COST INDEX AND CRUISE MANAGEMENT.............................38

7.1 Cost index - cruise speed relationship
(a)
 At a given gross weight

(b)
 At a given flight level

7.2 Cost Index - fuel consumption relationship
7.3 Cruise "managed" versus cruise "selected"
7.4 Airbus family Long-Range Cruise (LRC) cost indices
7.5 Wind effect on ECON speeds
7.6 Summary

8.  
DESCENT PERFORMANCE VERSUS COST INDEX ................51

8.1 Cost index - descent profile relationships
8.2 Variation of descent parameters with the cost index

9.  
PRACTICAL USE OF THE CI - OPERATIONAL RECOMMENDATIONS ...............................................................57
　
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