getting to grips with fuel economy(41)

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 445
 
Climb Speed
 330 to 300kias
 10
 15
 70
 35
 25
 -10
 
Cruise Altitude
 Optimum  to –2000’
 65
 80
 80
 100
 95
 135
 
Cruise Altitude
 Optimum  to +2000’
 90
 60
 25
 145
 30
 25
 
Cruise Mach
 Mecon+.01 to Mecon 
 230
 430
 40
 330
 900
 2540
 
Delayed Climb
 CFP to 500nm late
 240
 220
 180
 330
 390
 340
 
CG
 mid to aft
 710
 330
 0
 600
 900
 1550
 
Descent Speed
 Max to 300kt
 35
 40
 30
 70
 75
 100
 
Early Descent
 CFP to 2min early
 70
 70
 50
 80
 95
 135
 
Hold
 Green Dot Clean Conf
 190
 135
 30
 205
 230
 130
 

 
 
 
 
 
 
 
6.4 ECONOMIC BENEFITS

 
It may be that 5 or 10 kg extra fuel per flight does not seem significant in terms of the total fuel burn during the flight. However this saving accumulates with every flight. Sometimes the savings for an A340 seem worthwhile compared with the equivalent value for an A320, but the increased number of flight cycles for an A320 can make this saving more significant than that of the A340. The only way to assess the impact of any saving is to look at it over a given time span.
The economic impact calculations have assumed typical yearly utilisation rates, average sector lengths and sectors per year as follows:
Utilisation
 A300
 A310
 A320
 A330
 A340
 
Flying Hours/year 
 2600
 3200
 2700
 2900
 4700
 
Average sector - nm
 2000
 2000
 1000
 4000
 6000
 
Average flight time - hr
 4.5
 4.6
 2.4
 8.5
 13.8
 
No of sectors/year
 580
 700
 1125
 340
 340
 

 
　
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