11.5 Instruments/Other

Question 1

Define Angle of Attack.

Answer 1

Angle between the chord line of he aerofoil and the direction of the relative wind.

Question 2

Identify 2 types of common sensors used in angle of attack indicating systems.

Answer 2

Probe, Vane

Question 3

Name this component.

Answer 3

Vane operated Stall warning Sensor

Question 4

Where is the stagnation point on the vane assembly BELOW the critical AOA?

Answer 4

Just above the vane

Question 5

Name 2 stall warning sensor systems.

Answer 5

Vibrating reed and vane operated switch.

Question 6

What indications will your vane stall warning give off?

Answer 6

Horn, Light, Stick shaker.

Question 7

What is the purpose of the stick shaker?

Answer 7

Act as a stall WARNING , provide the pilot with a feeling of buffet indicating to pilot immediate action needs to take place. More demanding then light or horn.

Question 8

Which two metals are commonly used in aircraft resistance thermometry?

Answer 8

Nickel, Platinum.

Question 9

Describe Positive temperature coefficient.

Answer 9

With temp increase so does resistance.

Question 10

Describe Negative temperature coefficient.

Answer 10

With temp decrease, resistance increases.

Question 11

Name this component.

Answer 11

Ratiometer

Question 12

The resistance values of nickel and platinum increase with an increase in temperature, they are?

Answer 12

Positive temperature coefficients.

Question 13

Describe the purpose of the Calibrating balancing coil and Resistance Element

Answer 13

Calibrating balance coil - Constant temp/resistance characteristic for each bulb, compensates for any slight change in physical characteristic.
Resistance Element - At bottom end of bulb so it is closest to sensed liquid or has minimizing error.