Chapter 15: Stall Warning, Recovery and Regulations

Question 1

Natural Stall Warnings (5)

Answer 1

Buffet
Sluggish Controls
Noise (less noise)
High AoA
Loss of Altitude

Question 2

Artificial Stall Warnings (3)

Answer 2

Audible
Visual
Touch (Stick shaker)

Question 3

AoA Measurement Devices (4)

Answer 3

Flapper Switch (stagnation point behind switch)
AoA Vane (small wing aligns with EAF)
AoA Probe (2 air inputs, calculate AoA from deltaP)
AoA Rotating Prove (prove alignes with EAF)

Question 4

Stall Recovery Steps (2)

Answer 4

1. Pitch down

2. Increase thrust

Question 5

Stick Pusher Activated Recovery Steps (4)

Answer 5

1. Apply thrust
2. Disconnect AP
3. Trim
4. Once speed increased, pitch up

Question 6

Canard Effect on Stall

Answer 6

Canard elevators stall first -> pitch down -> stall recovery

Question 7

EASA CS23 Stall Regulation
For what AC is CS23
Stall Airspeeds (2)
What Configuration Vs Measured (3)

Answer 7

Small Aircrafts (commercial)
Vs0 = Stall speed at landing
Vs1 = Stall speed at TO

Measured experimentally @:
Max mass, thrust idle, CG forward

Question 8

EASA CS25 Stall Regulation
For what AC is CS25
Different Stall Speeds and Relationships

Answer 8

Vs1g = V @ Clmax
Vs = .94 Vs1g (actual stall of AC)
Vsr > Vs1g
Vsr0 = reference stall speed at landing
Vsr1  = reference stall speed at TO

Question 9

Stall Proximity Warning Threshold

Answer 9

+5 kn or +5% Vs