FLIGHT EFFICIENCY

Question 1

Define “Cost Index”?

Answer 1

Time costs/Fuel costs

Question 2

What does the flying at the correct Cost Index give in terms of Total cost?

Answer 2

Lowest total cost per GNM

Question 3

If weight decreases, what will have to happen to the speed for the same Cost Index

Answer 3

Speed will have to decrease

Question 4

In regards to Cost Index. If headwind increases, what will happen to the speed to optimize ground speed for lowest GNM cost

Answer 4

Speed will have to increase

Question 5

In regards to Cost Index. If tailwind increases, what will happen to the speed to optimize ground speed for lowest GNM cost

Answer 5

The speed will have to decrease

Question 6

When can APU be started at the earliest?

Answer 6

ETD -15 min

Question 7

What two factors affect Carbon Brake wear?

Answer 7

1 Nr of brake Applications

2 Carbon Disc Temp

Question 8

How much CO2 is saved per takeoff using Packs-off?

Answer 8

9kg(CEO) to 3 kg(NEO)

Question 9

How much CO2 is saved using NADP 2 (800 ft) instead of NADP 1 (1500 ft)?

Answer 9

50kg(CEO) to 31 kg(NEO)

Question 10

Are we allowed to increase the cost index?

Answer 10

No, not even if we are delayed

Question 11

If you are above profile, what is the recommended method of re-gaining the flight profile?

Answer 11

Speed up rather than using speed brakes

Question 12

What is the preferred approach technique?

Answer 12

A Decelerated Approach

Question 13

How much fuel can be saved using Config 3 rather than Config Full?

Answer 13

47kg(NEO) to 70kg(CEO)

Question 14

If you need to reduce landing distance, what tools are available in the planning phase. And what are the preferred order?

Answer 14

1 CONF FULL
2 REV MAX
3 Autobrake MED

Question 15

What kind of Reverse thrust is preferred and why?

Answer 15

Idle reverse

• Reduces noise
• Increased passenger comfort
• Less FOD damage

Question 16

What is the benefits of OETA?

Answer 16

• Reduced brake
  oxidation
• Reduced engine wear
• Reduced CO2
  emissions

Question 17

How does the selection of FLEX impact overall fuel burn and engine life?

Answer 17

It increases fuel burn due to lower thrust for take off due to that the take-off phase takes longer time,
But the increase in engine life results in a much higher overall cost saving

Question 18

Why does a PACK-OFF take off save fuel?

Answer 18

Air is bled directly from the engine for the ECS (Environmental Control Systems). Generation of this additional hot compressed air requires more work to be done by the engines to achieve this, which increases fuel burn

Question 19

What is the benefit to using MAX Reverse compared to idle Reverse?

Answer 19

More reverse thrust reduces brake usage