Chapter 16C - AOA Sensors and Stall Warning Systems

Question 1

What types of AoA sensors are there?

Answer 1

Probe and Vane

Question 2

Stalling is based on..?

Answer 2

AoA

Question 3

How does a conical probe work?

Answer 3

Changes in air pressure cause a rotary motion of the probe

Stagnation point is between the 2 slots

Uses an internal paddle to stay aligned

Question 4

How do you prevent icing on a conical probe?

Answer 4

Heated electrically

Question 5

What is a stick shaker?

Answer 5

Stall warning system

Comes in at Vs + higher of 5kts of 5%

Question 6

What is Minimum manoeuvring speed?

Answer 6

1.3G low speed buffet margin

Question 7

Orange hockey stick on a PFD is?

Answer 7

The minimum manoeuvring speed

Question 8

What are the inputs into a stall warning computer (SWC)?

Answer 8

AoA

Configuration (Flaps & Slats)

Air/ground logic (Weight on wheels)

Thrust

ADC - Airspeed, Mach No, or corrected AoA

Question 9

What are the outputs of a stall warning computer (SWC)?

Answer 9

Stick Shaker

Audio warning

Flight Envelope Protection

Red lines on the display and orange hockey stick

Question 10

Systems using the Angle of Attack measurement include:

Answer 10

• Air Data Computer – position error
• Stall Warning and Protection Systems critical AoA
• Flight Envelope Protection – stall protection
• Wind Shear Detection System – warning of unusual airflow

Question 11

Stall warnings must be?

Answer 11

unambiguous

Question 12

Detail some stall protection systems?

Answer 12

• Operational during manual and/or automatic flight
• “Stick push” and/or automatic deployment of leading edge devices operate on activation of stall warning in non fly-by-wire aircraft
• FBW aircraft protect from the stall by Flight Envelope Protection
• A/P maintains pitch attitude below and speed above stall attitude and stall speed
• SPS prevents the stall, SWS only provides a warning

Question 13

SPS … the stall, SWS provides a …..

Answer 13

Prevents and warning