FLIGHT EFFICIENCY Flashcards
Define “Cost Index”?
Time costs/Fuel costs
What does the flying at the correct Cost Index give in terms of Total cost?
Lowest total cost per GNM
If weight decreases, what will have to happen to the speed for the same Cost Index
Speed will have to decrease
In regards to Cost Index. If headwind increases, what will happen to the speed to optimize ground speed for lowest GNM cost
Speed will have to increase
In regards to Cost Index. If tailwind increases, what will happen to the speed to optimize ground speed for lowest GNM cost
The speed will have to decrease
When can APU be started at the earliest?
ETD -15 min
What two factors affect Carbon Brake wear?
1 Nr of brake Applications
2 Carbon Disc Temp
How much CO2 is saved per takeoff using Packs-off?
9kg(CEO) to 3 kg(NEO)
How much CO2 is saved using NADP 2 (800 ft) instead of NADP 1 (1500 ft)?
50kg(CEO) to 31 kg(NEO)
Are we allowed to increase the cost index?
No, not even if we are delayed
If you are above profile, what is the recommended method of re-gaining the flight profile?
Speed up rather than using speed brakes
What is the preferred approach technique?
A Decelerated Approach
How much fuel can be saved using Config 3 rather than Config Full?
47kg(NEO) to 70kg(CEO)
If you need to reduce landing distance, what tools are available in the planning phase. And what are the preferred order?
1 CONF FULL
2 REV MAX
3 Autobrake MED
What kind of Reverse thrust is preferred and why?
Idle reverse
- Reduces noise
- Increased passenger comfort
- Less FOD damage
What is the benefits of OETA?
- Reduced brake
oxidation - Reduced engine wear
- Reduced CO2
emissions
How does the selection of FLEX impact overall fuel burn and engine life?
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
Why does a PACK-OFF take off save fuel?
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
What is the benefit to using MAX Reverse compared to idle Reverse?
More reverse thrust reduces brake usage
