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080 – PRINCIPLES OF FLIGHT
081-01

SUBSONIC AERODYNAMICS
081-01-01 Basics, laws and definitions

2625
...
Assuming ISA conditions, which statement with respect to the climb is correct?
A – At constant TAS the Mach number decreases
B – At constant Mach number the IAS increases
C – At constant IAS the TAS decreases
D – At constant IAS the Mach number increases
Ref: AIR: atpl, cpl;
Ans: D
3848
...
The point about which the wing pitching moment is independent of angle of
attack is called:
A – the pitching centre
B – the centre of gravity
C – the centre of pressure
D – the aerodynamic centre
Ref: AIR: atpl, cpl;
Ans: D
4184
...
The unit of density is:
A – Bar
B – psi
C – kg/cm2
D – kg/m3
Ref: AIR: atpl, cpl;
Ans: D
4199
...
The term angle of attack is defined as:
A – the angle that determines the magnitude of the lift force
B – the angle between the wing chord line and the relative wind
C – the angle between the relative airflow and the horizontal axis
D – the angle between the wing and tailplane incidence
Ref: AIR: atpl, cpl;
Ans: B
4202
...
At a constant IAS, induced drag is affected by:
A – aircraft weight
B – changes in thrust
C – angle between chord line and longitudinal axis
D – wing location
Ref: AIR: atpl, cpl;
Ans: A
4213
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At a constant CAS when flying below sea level an aircraft will have:
A – a higher TAS than at sea level
B – a lower TAS than at sea level at ISA conditions
C – the same TAS as at sea level
D – the same TAS, but an increased IAS
Ref: AIR: atpl, cpl;
Ans: B
4232
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The units of wing loading (i) W / S and (ii) dynamic pressure q are:
A – (i) N/m2; (ii) kg/m2
B – (i) kg/m; (ii) N/m2
C – (i) N/m; (ii) kg
D – (i) N/m2; (ii) N/m2
Ref: AIR: atpl, cpl;
Ans: D
4252
...
The units of the density of the air (i) and the force (ii) are:
A – (i) kg/m3; (ii) N
B – (i) kg/m3; (ii) kg
C – (i) N/m3; (ii) N
D – N/kg; (ii) kg
Ref: AIR: atpl, cpl;
Ans: A
7643
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The dynamic pressure in the undisturbed flow and in the throat are e
B – A clutch is fitted between the engine and rotor drive unit
C – A semi-automatic gearbox is fitted between engine and rotor
D – A ‘free-wheeling’ unit is fitted between the engine and the rotor
Ref: HELI: atpl, cpl
Ans: D
25540
...
If when flying a helicopter a pilot accidentally finds themselves in a zero or
negative “G” situation, the correct recovery technique is to:
A – Apply rearward cyclic to reload the rotor into positive “G” situation, then
use cyclic to counteract the roll
B – Apply forward cyclic to remove the load on the rotor
C – Apply left cyclic to counteract the roll, whilst raising collective
D – Raise collective
Ref: HELI: atpl, cpl
Ans: A
25542
...
The technical term ‘washout’ can be described as:
A – A reduction in blade angle towards the tip to reduce the changes of
Retreating Blade Stall (RBS)
B – A reduction in blade angle towards the tip to delay the onset of
compressibility
C – A reduction in blade angle towards the tip to give a more equal
distribution of rotor thrust along the span
D – An increase in blade angle towards the tip to delay the onset of
compressibility
Ref: HELI: atpl, cpl
Ans: C
25544
...
Which of the following statements is correct about recirculation?
A – It reduces the induced flow, increasing the AoA and TRT
B – It increases the induced flow, increases the AoA and TRT
C – It reduces the induced flow, whilst AoA and TRT remain constant
D – It increases the induced flow, decreasing the AoA and TRT
Ref: HELI: atpl, cpl
Ans: D
25546
...
Which direction will a helicopter yaw if it suffers from a tail rotor control
failure at a high pitch setting during the cruise?
A – The same direction as the main rotor
B – The opposite direction to the main rotor
C – Always to the left
D – Always to the right
Ref: HELI: atpl, cpl
Ans: B
25548
...
The retreating blade experiences airflow reversal in forward flight

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