Chapter 7: Stalling

Question 1

When does a stall occur?

Answer 1

When critical angle of attack is exceeded

Question 2

What is stall speed in clean configuration? What about landing configuration?

Answer 2

• 97 KIAS

- 86 in LDG gear configuration

Question 3

When is the AoA indicator displayed on the HUD?

Answer 3

When landing gear is down

Question 4

What does the horizontal mark 3/4 up the AoA scale show ?

Answer 4

1.3 Vs = 10.5 AoA in clean configuration, 8.5 in approach configuration

Question 5

What is the critical AoA for the PC-21 in clean configuration?

Answer 5

16.5-17

Question 6

What are the symptoms approaching a power off 1g stall in level flight?

Answer 6

1) High n’ose attitude > 10 deg with PRS Reference Symbol displayed and CDM caged.
2) Low and decreasing airspeed
3) Less responsive controls
4) High AoA (more than 14 AoA)
5) Stall Warning ( 5-10 KIAS before the stall , at 14 AoA for a clean stall, amber stall caption on right MFD)
6) Light buffet (around 3 deg before the stall)

Question 7

What are the Stall indications?

Answer 7

1) Heavy airframe buffet
2) Slight nose drop
3) Possible wing drop (up to 10 deg)
4) A high rate of descent
5) High AoA
6) Continued stall warning