1. Initial Pilot Ground School Tail Rotor Drive System
EC 130 B4
Initial Pilot Ground School
Chapter 6
Tail Rotor Drive System
and Tail Rotor

2. Chapter 6 - Tail Rotor Drive System and Tail Rotor
Tail Rotor Drive Shaft Assembly ..……………………………………….. 6.4
Tail Rotor Drive System Technical Characteristics ..……......………. 6.6
Rear Tail Rotor Drive Shaft ……………………….………………………. 6.7
Tail Rotor Gear Box ...……………………………………………………… 6.9
Tail Rotor Gear Box Chip Detection ……………………………………
Tail Rotor Gear Box Chip Caution Light ………………………………
Tail Rotor - Fenestron ……………………………………………………
Tail Rotor Blade Attachment Components ……...……………………
Tail Rotor Control Failure ...………………………...……… 6.22, 6.23 & 6.25
Review Questions …………………………………………………………
6.2

3. Tail Rotor Drive System
TAIL ROTOR DRIVE GENERAL
6.3

4. Tail Rotor Drive Shaft Assembly
Rear Light Aluminum Alloy Drive Shaft
Middle Light Aluminum
Alloy Drive Shaft
Forward Stainless Steel Drive Shaft
NO. 1 BEARING is at the rear of the assembly.
TAIL ROTOR DRIVE
GENERAL DESCRIPTION
FRONT SHAFT
CENTRAL SHAFT
REAR SHAFT
The tail rotor drive shaft is similar to that found on the AS350. The middle long shaft is shorter, and it couples via an adapter to an aluminum alloy shaft which connects to the tail rotor gear box.
6.4

5. Tail Rotor Drive Shaft Assembly Short Forward Shaft - Stainless Steel
Long Shaft - Aluminum Alloy
Short Rear Shaft - Aluminum Alloy
Coupling Flange
6.5

6. Tail Rotor Drive System Technical Characteristics
6.6

7. Rear Tail Rotor Drive Shaft
Forward
REAR SHAFT
6.7

8. T/R Rear Shaft input into T/R Gear Box
Forward
REAR SHAFT
Input speed is approximately 6000 rpm
6.8

9. Tail Rotor Gear Box Splash lubricated with MIL-L-6086C 3584 RPM
The “Shell” Trademark is Prohibited.
[ This is due to foaming caused by an additive in Shell mineral oil
which actually decreases the lubricating properties of the oil. ]
6.9

10. Tail Rotor Gear Box
TAIL GEARBOX
6.10

11. Top View of Tail Rotor Gear Box
Forward
Single Stage
Angle Reduction
6.11

12. Tail Rotor Gear Box Chip Detection
Oil Filler Cap
Oil Level Sight Glass
Electrical Magnetic Chip Plug
MGB CHIP
6.12

13. Metal particles in TGB oil circuit
WARNING PANEL
CORRECTIVE ACTIONS
TGB CHIP
Metal particles in TGB oil circuit
Flight Manual - Emergency Procedures - Page 3-14
6.13

14. Avoid prolonged hovering
WARNING PANEL
CORRECTIVE ACTIONS
Avoid prolonged hovering
TGB CHIP
CONTINUE FLIGHT
Metal particles in TGB oil circuit
Flight Manual - Emergency Procedures - Page 3-14
6.14

15. Tail Rotor - Fenestron
TAIL ROTOR
The 10 aluminum alloy blades are asymmetrically spaced for noise reduction purposes and turn at approximately 3584 rpm. They have a clockwise rotation as viewed from the left.
6.15

16. Tail Rotor
Pedal input to the tail rotor is via a flexible ball cable which then connects to a rigid control rod. There is no hydraulic boost to the tail rotor.
6.16

17. T/R Blade Attachment Components
Pitch change spider
Chinese weights
Pitch change ball joint
Tension - torsion straps
made of stainless steel
6.17

18. T/R Blade Attachment Components
6.18

19. TAIL ROTOR CONTROL FAILURE
Symptom: the helicopter will yaw to the left with a rotational speed depending on the amount of power and the forward speed set at the time of the failure.
Hover - IGE (or OGE in HV diagram)
Flight Manual - Emergency Procedures - Page 3 - 5
6.19

20. TAIL ROTOR CONTROL FAILURE
Symptom: the helicopter will yaw to the left with a rotational speed depending on the amount of power and the forward speed set at the time of the failure.
Hover - IGE (or OGE in HV diagram)
LAND IMMEDIATELY
1. Twist Grip ….IDLE STOP POSITION
2. Collective ….INCREASE to cushion touch-down
Flight Manual - Emergency Procedures - Page 3 - 5
6.20

21. TAIL ROTOR CONTROL FAILURE
Symptom: the helicopter will yaw to the left with a rotational speed depending on the amount of power and the forward speed set at the time of the failure.
Hover - IGE (or OGE in HV diagram)
LAND IMMEDIATELY
1. Twist Grip ….IDLE STOP POSITION
2. Collective ….INCREASE to cushion touch-down
Hover - OGE (Clear area, out of HV diagram)
Flight Manual - Emergency Procedures - Page 3 - 5
6.21

22. TAIL ROTOR CONTROL FAILURE
Symptom: the helicopter will yaw to the left with a rotational speed depending on the amount of power and the forward speed set at the time of the failure.
Hover - IGE (or OGE in HV diagram)
LAND IMMEDIATELY
1. Twist Grip ….IDLE STOP POSITION
2. Collective ….INCREASE to cushion touch-down
Hover - OGE (Clear area, out of HV diagram)
Simultaneously,
1. Collective ….REDUCE depending upon available height
2. Cyclic ….FORWARD to gain speed
3. Cyclic ….ADJUST to set IAS to Vy and control yaw
LAND AS SOON AS POSSIBLE
If a go-around has been performed, carry out an autorotative landing on a suitable area as landing procedure.
(Continued
Flight Manual - Emergency Procedures - Page 3 - 5
6.22

23. TAIL ROTOR CONTROL FAILURE
WARNING
SAFE AUTOROTATIVE LANDING CAN NOT BE WARRANTED IN CASE OF A FAILURE IN HOGE BELOW THE TOP POINT OF THE HV DIAGRAM (REFER TO SECTION 5) OR IN CONFINED AREA.
Flight Manual - Emergency Procedures - Page 3 - 5
6.23

24. TAIL ROTOR CONTROL FAILURE
In Cruise Flight
Flight Manual - Emergency Procedures - Page 3 - 5
6.24

25. TAIL ROTOR CONTROL FAILURE
In Cruise Flight
1. Cyclic ….ADJUST to set IAS to Vy and control yaw
2. Collective ….REDUCE to avoid sideslip
LAND AS SOON AS POSSIBLE
APPROACH AND LANDING
Carry out an autorotative landing on a suitable area as landing procedure.
Flight Manual - Emergency Procedures - Page 3 - 5
6.25

26. Review
Questions
6.26

27. 45. What is the tail rotor drive shaft connected to on the forward end?
Engine reduction gearbox via a stainless
steel shaft and flex-couplings.

28. 46. What is the aft tail rotor drive shaft connected to on the aft end?
D. The Tail Gearbox via flex-couplings.

29. 47. What is the forward drive shaft constructed of?
C. Stainless steel

30. 48. What is the middle shaft constructed of?
B. Aluminum alloy

31. 49. What type of reduction is used in the tail rotor gear box?
D. Single stage angle reduction.

32. 50. What oil monitoring devices are used in the tail rotor gearbox?
B. CHIP TGB light and oil level sight glass.

33. 51. The tail rotor pitch change bellcrank moves a certain component on the tail rotor output shaft to cause pitch changes in the tail rotor. What component does this?
A. Pitch change spider.

34. 52. What are the tail rotor blades made of?
D. Aluminum alloy.

35. 53. Why are the ten asymmetrical fenestron blades staggered?
D. To reduce the noise level.

36. 54. Is “Shell” oil permitted in the tail gear box?
B. No.

37. Initial Pilot Ground School Tail Rotor Drive System
EC 130 B4
Initial Pilot Ground School
End of Chapter 6
Tail Rotor Drive System
and Tail Rotor