Flight Efficiency

Question 1

What percentage of all cost does fuel represent?

Answer 1

32% (roughly 1/3)

1% fuel saving = £13 millions annually save = 35kg/sector

Question 2

What is the cost of weight?

What percentage is the fuel burn to carry 1kg?

Answer 2

3-4% of the weight in extra fuel carried

1 hour of flight with 1000kg extra will burn approx. 30-40kg/h

1kg extra is about 16.000€/year

Question 3

What cost index should be used for diversion ?

Answer 3

Cost index 0

Question 4

If APU is used but not APU Bleed, what is the fuel burn saving?

Answer 4

Approximately 15%

Question 5

What is the typical potable water usage per hour of flight with normal passenger load ?

Answer 5

10% per hour

Question 6

Up to which percantage should the portable water be filled up with for flight less than four hours?

Answer 6

70%

Question 7

What is the average fuel save for OETD ?

Answer 7

17.5 kg

Question 8

What is easyjet ATC Delays policy ?

Answer 8

Push on time if delay is less than 30 minutes, absorb delay by taxiing.

If delay more than 30 minutes, consider remote holding.

Question 9

What is the fuel saving of a NADP2 compared to NADP1 ?

Answer 9

14kg

Question 10

What is the impact of flying M.79 instead of M.77 ?

Answer 10

Increase in fuel burn between 1.5% to 2.5%

Question 11

What are the conditions to make a correction if you realise that temperature or wind is different from planned OFP?

Answer 11

30° or 30kts in wind or 5°C in temperature.

Question 12

What is the fuel saving for FLAPS 3 landing in a 319 and a 320?

Answer 12

319 = 16kg

320 = 9kg

Question 13

What is OETA average fuel saving?

Answer 13

17.5kg

Question 14

What is the average fuel saving of sharklets ?

Answer 14

3%