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PPL Course - (4) Performance and Planning > Chapter 5.8 - In-Flight Performance > Flashcards

Chapter 5.8 - In-Flight Performance Flashcards

1
Q

What does CL stand for?

A

Climb.

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2
Q

What does CZ stand for?

A

Cruise.

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3
Q

What does DES stand for?

A

Descent.

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4
Q

What’s the main purpose of In-flight Performance?

A

Finding the optimum Height, Speed and Power Setting to obtain the fastest cruise using the least amount of Fuel.

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5
Q

Define Range in In-flight Performance?

A

Distance without refuelling with Fuel Reserves intact.

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6
Q

What does SR stand for?

A

Specific Range.

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7
Q

Define SR?

A

Distance per Fuel Unit/Fuel Unit per Distance.

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8
Q

What does SGR stand for?

A

Specific Ground Range.

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9
Q

Define SGR?

A

Distance is measured relative to the ground.

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10
Q

What does SAR stand for?

A

Specific Air Range.

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11
Q

Define SAR?

A

Distance is measured relative to the air.

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12
Q

Name two distance units used for In-flight Performance and their abbreviations (2)?

A
  • Air Nautical Miles (ANM).

- Ground Nautical Miles (GNM).

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13
Q

Name four fuel units used in In-flight Performance and their abbreviations?

A
  • US Gallons (Gal).
  • Litres (L).
  • Pounds (lb).
  • Kilograms (kg).
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14
Q

Specific Air Range is found from using which speed?

A

True Airspeed (TAS).

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15
Q

What is the calculation for SAR and SGR?

A

Groundspeed/True Airspeed divided by Fuel Flow.

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16
Q

Name four main factors which affect In-flight Performance?

A
  • Airspeed.
  • Fuel Consumption.
  • Wind.
  • Weight.
17
Q

True or False. Increase in Density Height will increase True Airspeed?

A

True.

18
Q

What Engine Control Settings are selected to optimise Fuel Consumption, with regards to Carburettor Heat and Mixture Control?

A
  • Carburettor Heat OFF.

- Mixture Control LEAN.

19
Q

How does Headwind affect Specific Range?

A

Decreases.

20
Q

How does Tailwind affect Specific Range?

A

Increases.

21
Q

How can Weight affect Specific Range?

A

Decreasing Weight increases Specific Range.

22
Q

Name four factors which affect the Specific Fuel Consumption?

A
  • Engine Speed (RPM).
  • Manifold Pressure.
  • Fuel/Air Mixture.
  • Density Height.
23
Q

The best Specific Range is achieved when the Aircraft is flown at an Airspeed corresponding to what?

A

Minimum Ratio of Specific Fuel Consumption.

24
Q

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?

A

True.

25
Q

When fuel unit per NM is found, what is the calculation for FBO?

A

FBO = Distance multiplied by SR.

26
Q

When NM per unit of fuel is found, what is the calculation for FBO?

A

FBO = Distance divided by SR.

27
Q

When Gross Weight is increased, the speed for Maximum Lift/Drag Ratio must be (increased/decreased)?

A

Increased.

28
Q

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)?

A
  • Increase of 15% in Headwind conditions.

- Decrease of 5% in Tailwind conditions.

29
Q

For Light Training Aircraft, In-flight Performance is optimum at which settings for Cruise Power, Configuration, Mixture and Carburettor (4)?

A
  • Cruise Power = Standard.
  • Configuration = Clean.
  • Mixture = Lean.
  • Carburettor = Off.
30
Q

Which is more important in determining Specific Ground Range (Groundspeed and Pressure Height/Temperature and Weight)?

A

Groundspeed and Pressure Height.

31
Q

What does Maximum Endurance mean?

A

Flying for as long as possible for a given amount of fuel.

32
Q

How does a Pilot achieve Minimum Fuel Flow?

A

By flying low as possible at an Airspeed for Best Glide.

33
Q

Name four calculations which can be found when using Climb Charts?

A
  • Rate of Climb.
  • Time of Climb.
  • Fuel Consumption on Climb.
  • Climb Distance.
34
Q

True or False. The Cessna doesn’t have a Descent Chart?

A

False. It is assumed the cruise will always be to overhead of destination.

PPL Course - (4) Performance and Planning (31 decks)

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