Stalling Flashcards
What factors affect stalling? (5)
Aircraft weight, flap, power, altitude and load factor
What is a stall and when does it occur?
A stall is a loss of lift over the wings caused by a breakdown of laminar airflow as the AoA reaches a critical point, usually 16º.
How does power effect stall speed?
With power on the PC-21 will stall at a slower IAS due to airflow over the wings
What is the PC-21 clean and landing configuration stall speed?
Clean = 97KIAS
LDG Config = 86KIAS
What are the SYMPTOMS of a stall in the PC-21? (5)
- High nose attitude (climb attitude/10ºAoA)
- Low and decreasing airspeed
- Less responsive controls
- Stall warning (5-10KTS before or 14ºAoA)
- Light buffet (3KIAS before)
What are the INDICATIONS that you are about to be/are in a stall? (5)
- Heavy airframe buffet
- Slight nose drop
- Possible wing drop
- High RoD
- Continued aural stall warning
What is the standard stall recovery (SSR) for a fully developed clean stall at 1g? (7)
Simultaneously:
- Apply MAX power
- Relax the control column centrally forwards
- Use rudder to control wings
Once the wings are un-stalled:
- Level the wings with aileron
- Smoothly select the take off attitude
- If flaps LDG, set flaps to T/O
Carry out tripple ‘O’ checks
How much height is lost in a fully developed vs incipient stall recovery?
300ft vs 0ft
Before entering a stall/wing over/aerobatics, what should you do/complete?
- Complete HASELL checks
- Confirm area below is clear
You have just levelled off from the wingover, what are your actions setting up for the stall?
- PCL - IDLE
- Trim - Stop at 120KIAS
- Work cycle - Attitude, altitude, skid-ball
- Stall warning - Ack
- SSR - First stall indication
- Triple ‘O’ Checks
What are triple ‘O’ checks?
Visually check the gear, flap and A/B position indicators and state the configuration
1. Over speed - Yes/no
2. Over stress - Yes/no (If no, complete after T/O checks)
3. Orientation - Check
What is required if an overspeed or over stress is found during triple ’O’ checks?
Controabilty check, remain the same configuration and another aircraft comes and has a look at you
When you hear the stall warning, what do you do?
Always acknowledge the stall warning
What are the altitude restrictions that students must follow for stalls?
All stalls must be completed 3000ft HAOW 600m or 3000ft above cloud
During the height consideration as part of HASELL checks, what are you doing?
Deciding on a minimum recovery height before making an abandonment decision, can be calculated by getting LSALT + 1500ft
