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ATPL 2019 > POF > Flashcards

POF Flashcards

1
Q

Stall speed highest when CG is?

A

Forward (due to tailplane countering lift to keep aircraft level)

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2
Q

Minimum Control speeds highest when CG is?

A

Aft (due to shorter rudder moment arm)

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3
Q

How does thrust affect stall speed?

A

Because at a stall (high AoA) a component of thrust is acting with lift, removing this will cause the stall speed to increase. Published stall speeds are determined with zero thrust normally.

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4
Q

What’s a pushover?

A

Lower than 1.0 Load Factor. Stall speed decreases

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5
Q

Buffer Margin _____ during a constant IAS descent?

A

Increases (Mach No becomes smaller)

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6
Q

Forward CG - What Happens to Stick Force?

A

Increases due to increased stability

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7
Q

Equation VA based on VS => ___ x _____

A

Va => Vs x sq.rt(n load factor)

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8
Q

Transport Aircraft - Positive load factor with flaps extended

A

+2.0g

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9
Q

Transport Aircraft - Positive load factor clean

A

+2.5g

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10
Q

Load Factor in bank = ___ / ____

A

Load Factor = 1 / Cos(Angle of bank)

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11
Q

Radius of turn from Velocity

A

TAS2(in m/s)
g (9.81) x Tan(Angle of bank)

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12
Q

Stall speed Vs related to weight

A

Vs = sq.rt(Weight)

Weight = Lift

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13
Q

Load factor with change of speed

A

Change in g x (new speed / old speed)

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14
Q

Va based on load factor and Vs

A

Va = Vs x sq.rt(Load Factor)

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15
Q

When does Shock Stall occur?

A

When CL is at max

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16
Q

Positive Load factor for Light Aircraft

A

+3.8g

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17
Q

Positive Load factor for Light Utility Aircraft

A

+4.4g

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18
Q

Taper ratio is …

A

Taper ration = Tip Chord to Root Chord

(It’s always less than 1)

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19
Q

When a propeller has icing it’s efficiency drops by … %

A

20%

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20
Q

Ideal Gas - Density / Pressure / Temp Equation

A

Gas Constant (C) = Pressure

(rho x T (K))

21
Q

Coefficient of Induced Drag (CDI) = ____

A

CDI = CL2

22
Q

Aspect Ratio Calculation

A

AR = Wing Span2
Wing Area

Wingspan : Mean Geometric Chord

23
Q

The Continuity Equation is

A

K = Area x Density x Velocity

24
Q

What happens at an Expansion Wave?

A

Compressed air expands…

  • Decrease in pressure
  • Decrease in density
  • Decrease in temperature
  • Increase in velocity
25
Q

Positively cambered aerofoil at zero lift produces ______ pitching moment

A

Nose down

26
Q

Where is wing sweep angle measured?

A

Angle st 25% chord line to lateral axis

27
Q

What do Fowler Flaps do? (position / camber)

A

Move aft increase S, and also increase camber

28
Q

When the CG is at the Neutral point what happens

A

Neutral Longitudinal Stability!

29
Q

Wing Loading is

A

Aircraft Weight
Wing Area

30
Q

Power is ____ x _____

A

Power = Force x Velocity

Rate of doing work

31
Q

Drag Divergence Mach against MCRIT

A

Higher than MCRIT

32
Q

Sweptback wings behave like…

A

Thinner wings

33
Q

Dutch roll occurs with what stability?

A

Strong Lateral
Weak Directional

34
Q

Mean Geometric Chord

A

Wing Area
Wing Span

35
Q

Main funciton of Trailing Edge Flaps?

A

Increase CLMAX

36
Q

Differences at Shockwave

A

Temp - Up
Density - Up
Pressure - Up
Velocity - Down

Opposite behind expansive wave

37
Q

Where is VRA situated on Manoeuvre Envelope?

A

Between Va and Vc

38
Q

Max Gusts on Gust envelope diagram

A

25ft/sec at Vd
50ft/sec at Vc
66ft/sec at Vb (design speed for max gust intensity)

39
Q

Gust Load Factor Equation

A

Change in Load Factor x (New Speed/Old speed)

40
Q

Stall speed for given Vs multiple

A

Stall Load Factor= Given Vs value2

41
Q

Prop Efficiency is

A

Usable Prop Power THP (Thust x TAS)
Shaft Power EHP (Torque x RPM)

42
Q

How do you increase Power Absorption of Prop?

A

Increase Diameter

Increase Solidity
(Reduces efficiency)

(Limited by tip speed / clearance)

43
Q

Examples of artificial control force generation

A

Spring Feel (no relationship to actual Q)
Bob Weight
Q-Feel
Gear Change (usually on rudder)

44
Q

Aperiodic Means (and example)

A

No oscillating - Spiral Dive - Where Strong Directional stability and Weak Lateral Stability exists

45
Q

Ice on Leading Edge may increase VTH by (%)

A

40-50%

46
Q

TAS at 40,000 compared to MSA

A

TAS Doubled

47
Q

Aerobatic Aircraft max Load Factor

A

6g

48
Q

Circumference of Circle based on Radius

A

C = 2 x pi x R

49
Q

Skidding / Slipping - Ball and Corrective action

A

Ball will be towards circular path

Skidding (nose inwards) / Slipping (nose outside)

Correct by rudder (kick the ball)
Or increase bank angle in opposite direction to ball

ATPL 2019 (10 decks)

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