POF Q21 - Flight Mechanics Threats and Errors

Question 1

Which aircraft locations are most vulnerable to ice build up?
Select one:

a.The ailerons

b.The nose

c.The wing trailing edge

d.Frontal areas

Answer 1

d.Frontal areas

Question 2

The effects of very heavy rain (tropical rain) on the aerodynamic characteristics of an aeroplane are:
Select one:

a.decrease of CLmax and increase of drag

b.increase of CLmax and decrease of drag

c.increase of CLmax and increase of drag

d.decrease of CLmax and decrease of drag

Answer 2

a.decrease of CLmax and increase of drag

Question 3

Ice build up a wing will not effect CLMax.
Select one:

a.False

b.True

c.CL max varies with IAS only

d.CL max is increased

Answer 3

a.False

Question 4

Alpha crit is reduced with ice build up.
Select one:

a.Increased

b.TRUE

c.FALSE

d.Unchanged

Answer 4

b.TRUE

Question 5

In which phase of the take-off is the aerodynamic effect of ice located on the wing leading edge most critical?
Select one:

a.All phases of the take-off are equally critical

b.The last part of the rotation

c.The approach to land

d.During climb with all engines operating

Answer 5

b.The last part of the rotation

Question 6

An ageing aircraft is likely to have more ….. drag
Select one:

a.Skin friction

b.Form

c.Induced

d.Interference

Answer 6

a.Skin friction

Question 7

Skin ageing on an older aircraft is likely to encourage which type of boundary layer?
Select one:

a.Separation layer

b.Laminar

c.Turbulent

d.Transition layer

Answer 7

c.Turbulent

Question 8

What effect does icing have on stall speed?
Select one:

a.Increases stall speed

b.Increases stall speed only through increased mass

c.Decreases stall speed only through increased mass

d.Decreases stall speed

Answer 8

a.Increases stall speed

Question 9

What is the main threat of a tailplane stall?

a.Too much pitch authority

b.Loss of downforce on the tailplane

c. loss of lift on the wings

d.uncontrolable pitch up moment

Answer 9

b.Loss of downforce on the tailplane

Question 10

Which of the following are threats at high altitudes which could result in buffet or stall?

PICK 3 of 5

a.Wake Turbulence

b.Windshear & Microbursts

c.Jet Streams

d.Clear air Turbulence

e.Thunderstorms

Answer 10

c.Jet Streams

d.Clear air Turbulence

e.Thunderstorms