Limitations Flashcards

1
Q

GLF with higher wing loading

A

GLF increases

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2
Q

ULL of a jet transport a/c

A

3.75

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3
Q

CS 25- LF limit for a normal transport a/c

A

2.5g to -1.0g

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4
Q

CS 23 - LF limit for a utility a/c

A

4.4g - 1.75g

E.g heavy transport a/c

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5
Q

CS 23 - LF limit of a aerobatic a/c

A

6g to -3G - not economical

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6
Q

Graph for LF against IAS

A

V-N diagram

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7
Q

What happens to GLF with an increase in wing loading

A

GLF increases

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8
Q

What happens if you pass the curve lines on the v-n diagram

A

You will stall

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9
Q

What happens if you pass the NLL

A

You will overstress the a/c

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10
Q

What happens if you pass the ULL

A

You will cause structural failure

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11
Q

Relationship between VA and ULL

A

ULL will always be 22% higher than VA speed

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12
Q

Formulas for working out VA

A

Va= Vs1g x square root of the LF

Va = Vaold x square root of Wnew/Wold

% change in va = 50% change in weight

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13
Q

What happens to va with altitude

A

Va is higher at altitude

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14
Q

Vb vertical gust requirement

A

20,000 - 66ft/s

50,000 - 38ft/s - linear decrease

However this speed is too slow to fly at

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15
Q

Vc and vd gust requirement

A

Vc - 55ft/s

Vd - 25ft/s

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16
Q

Formula for working out change in LF with a gust

A

Use the usual LF formula but add the additional CL created to the lift part of the formula

17
Q

Change in LF at high altitude

A

Due TAS increasing at altitude, the change in AoA is reduced due to the bigger speed vector

18
Q

To work out LF at the stall speed

A

Square of the stall speed e.g 1.3vs=30%faster than vs

So LF = (1.3)2 = 1.69

19
Q

Effect of aspect ratio on the change in LF with a gust

A

Increases LF change with an increase in aspect ratio

20
Q

Effect on mass on the GLF

A

Lighter the a/c is the bigger the effect of the gust

21
Q

The effect on wing loading on the GLF

A

The harder the wing has to work, the effect of the gust is decreased

22
Q

The effect of wing area n GLF

A

Increasing the wing area, increases the GLF

23
Q

The effect of GLF on increasing IAS

A

GLF will increase

24
Q

Effect on increasing altitude on GLF

A

GLF will decrease

25
Q

1.3g altitude

A

Height at which a 0.3g change in LF will not cause a buffet

26
Q

Effect of wing loading on the change of lift in a gust

A

High wing loading = small change

Low wing loading = big change

27
Q

Relationship between CL to AoA curve on the change in CL with a gust

A
Steep curve = big increase in CL 
Shallow curve (swept wing) = lower change in CL
28
Q

What should be taken into account during the determination of VA

A

Limit load factor

29
Q

What does VMCA depend on

A

Airport density altitude, location of engines on the a/c

30
Q

What happens to the GLF when the wing area decreases

A

GLF decreases

31
Q

What happens to GLF when the EAS decreases

A

GLF decreases