Yaw Control Emergencies

Question 1

What is the optimum wind direction for autorotation and running LDG with YCE?

Answer 1

Running LDG: 10 - 11 o’clock
Autorotation: 1 - 2 o’clock

Question 2

What are the two termination options for YCE and why would you choose one over another?

Answer 2

Autorotation - Chosen when tail rotor failure is complete
Power on - Typically used for fixed pitch tail rotor failure

Question 3

You suspect that you have tail rotor control problems, what are your initial actions?

Answer 3

C - “Suspected YCE”
A - Safe speed (greater than 70kts), height, HDG
- Collective to reduce side slip
- Try other pedals/look for FOD/Confirm AFCS fully functional
N - From here we will complete controllability check and maintain/turn upwind/downwind
C - Make a MAYDAY call and inform TWR of control issues and request extended upwind
A - Get out the check list and the flying guide

Question 4

Explain the process of the handling check

Answer 4

Setup: Into wind, above 1000ft AGL, flying at a line feature
Decrease speed in 10kt increments, stabilise alt and IAS

Question 5

What is the relationship between nose direction and YCE EMRG in the controllability check?

Answer 5

If the nose is sitting to the right above 70kts, this indicates a total loss of drive = Autorotation
If the nose is sitting to the left until 40 kts where it moves to the right (slightly) then this indicated fixed pitch = Running LDG

Question 6

Explain the process for a running LDG with YCE

Answer 6

Shallow approach, decel to 40kts
Descend to IGE above the RWY, slow decel until the nose is straight/slightly right
Once nose is straight set speed stable attitude lower the collective land IAW normal running LDG

Note: Land on the RHS of the RWY

Question 7

You are conducting the running LDG, in which direction will the aircraft move and what options do you have to control it?

Answer 7

Cyclic to increase decrease friction on one side
If yaw/drift left is significant reduce throttles
Double engine EMRG shutdown after LDG

Question 8

After landing the YCE, what are your actions?

Answer 8

Cancel MAYDAY
Double engine EMRG shutdown

Question 9

You have completed the controllability check and the nose is pointing to the right at 60KTS, what are your actions from here?

Answer 9

C - “The aircraft looks like a total loss of tail rotor drive, we will conduct an autorotation”
A - Climb 1400ft, 75kts airspeed, SHED bus
N - This will be a power off autorotation for the 1000ft markers
C - Inform TWR of the AUTO
A - PWP, LDG checks, flight guards open SHED BUS again
- PWP = “Power will be off, wind is …. Plan is power off auto, shutdown both engines when I’m confident we will make the RWY”

Question 10

What is the work cycle for YCE in the hover?

Answer 10

Oppose - the yaw with pedals No changes
Close - Close the twist grips an lower coll
Cushion - Cushion with collective

Question 11

What is collective steering?

Answer 11

In a fixed pitch tail rotor failure the nose will hold straight for a given collective setting,therefore if you rise the nose will come right and the lower it will come left