Chapter 5.8 - In-Flight Performance Flashcards
What does CL stand for?
Climb.
What does CZ stand for?
Cruise.
What does DES stand for?
Descent.
What’s the main purpose of In-flight Performance?
Finding the optimum Height, Speed and Power Setting to obtain the fastest cruise using the least amount of Fuel.
Define Range in In-flight Performance?
Distance without refuelling with Fuel Reserves intact.
What does SR stand for?
Specific Range.
Define SR?
Distance per Fuel Unit/Fuel Unit per Distance.
What does SGR stand for?
Specific Ground Range.
Define SGR?
Distance is measured relative to the ground.
What does SAR stand for?
Specific Air Range.
Define SAR?
Distance is measured relative to the air.
Name two distance units used for In-flight Performance and their abbreviations (2)?
- Air Nautical Miles (ANM).
- Ground Nautical Miles (GNM).
Name four fuel units used in In-flight Performance and their abbreviations?
- US Gallons (Gal).
- Litres (L).
- Pounds (lb).
- Kilograms (kg).
Specific Air Range is found from using which speed?
True Airspeed (TAS).
What is the calculation for SAR and SGR?
Groundspeed/True Airspeed divided by Fuel Flow.
Name four main factors which affect In-flight Performance?
- Airspeed.
- Fuel Consumption.
- Wind.
- Weight.
True or False. Increase in Density Height will increase True Airspeed?
True.
What Engine Control Settings are selected to optimise Fuel Consumption, with regards to Carburettor Heat and Mixture Control?
- Carburettor Heat OFF.
- Mixture Control LEAN.
How does Headwind affect Specific Range?
Decreases.
How does Tailwind affect Specific Range?
Increases.
How can Weight affect Specific Range?
Decreasing Weight increases Specific Range.
Name four factors which affect the Specific Fuel Consumption?
- Engine Speed (RPM).
- Manifold Pressure.
- Fuel/Air Mixture.
- Density Height.
The best Specific Range is achieved when the Aircraft is flown at an Airspeed corresponding to what?
Minimum Ratio of Specific Fuel Consumption.
True or False. The most important factor in obtaining Minimum Specific Fuel Consumption is achieved by having the leanest possible mixture with regards to engine smoothness and density height considerations?
True.
When fuel unit per NM is found, what is the calculation for FBO?
FBO = Distance multiplied by SR.
When NM per unit of fuel is found, what is the calculation for FBO?
FBO = Distance divided by SR.
When Gross Weight is increased, the speed for Maximum Lift/Drag Ratio must be (increased/decreased)?
Increased.
If the Wind Component is greater than 25% of the True Airspeed, what percentage of increase and decrease should the Airspeed be applied to Headwind and Tailwind conditions to obtain best Specific Ground Range (2)?
- Increase of 15% in Headwind conditions.
- Decrease of 5% in Tailwind conditions.
For Light Training Aircraft, In-flight Performance is optimum at which settings for Cruise Power, Configuration, Mixture and Carburettor (4)?
- Cruise Power = Standard.
- Configuration = Clean.
- Mixture = Lean.
- Carburettor = Off.
Which is more important in determining Specific Ground Range (Groundspeed and Pressure Height/Temperature and Weight)?
Groundspeed and Pressure Height.
What does Maximum Endurance mean?
Flying for as long as possible for a given amount of fuel.
How does a Pilot achieve Minimum Fuel Flow?
By flying low as possible at an Airspeed for Best Glide.
Name four calculations which can be found when using Climb Charts?
- Rate of Climb.
- Time of Climb.
- Fuel Consumption on Climb.
- Climb Distance.
True or False. The Cessna doesn’t have a Descent Chart?
False. It is assumed the cruise will always be to overhead of destination.
