Flight Controls

Question 1

Tail rotor malfunctions are classified into what two categories?

Answer 1

Control system and drive system

Question 2

What indicates a tail rotor drive system failure?

Answer 2

Sharp yaw to the right relative to how much power is being applied.
Excessive noise and vibration from tail section.
Touchdown should occur with no power applied to the main rotor.

Question 3

What are the types of tail rotor control failure?

Answer 3

Fixed-pitch
  Prior to mixing unit 
    (stuck pedal)
  After mixing unit 
    (collective to yaw coupling)
Cable failure
  Single cable
  Dual cable

Question 4

Describe stuck pedals.

Answer 4

Binding occurs between the pedals and mixing unit. Pedals will not move or will have limited range. Full range of collective movement available. Normal collective to yaw coupling is available.

Question 5

Describe fixed pitch.

Answer 5

Blockage is aft of the mixing unit. No tail rotor pitch control is available. Collective movement with pedal inputs and vise versa.

Question 6

How do you land with fixed pitch?

Answer 6

Fixed pitch occurring at high power setting yaws helicopter left, reduce airspeed and add power until nose aligns with runway.
Fixed pitch at cruise requires slightly higher airspeed and lower power.
Fixed pitch at low power requires highest touchdown speed 54 kts at power setting that allows alignment.

Question 7

How do you land with cable failure?

Answer 7

Helicopter trims normally at 40 and 135
Single cable failure
Right-normal left pedal available
Left-

Question 8

How many trim and series actuators are there?

Answer 8

3 pairs of series actuators

4 trim actuators

Question 9

What does the AHRS do?

Answer 9

Attitude Heading and Reference System provides attitude rate and positional signals to flight computers. Provides pitch and roll attitude signals to the flight computers.

Question 10

Trim vs Series actuators

Answer 10

Trim 
   Move controls
   Have 100% control authority
   Electronic clutch - trim switches
Series
   Do not move controls
   Have 10% control authority

Question 11

SAS and ATT

Answer 11

Stability Augmentation System
Provides rate dampening

Attitude Mode
   Provides attitude retention in pitch and roll
   Heading hold
       Yaw less than 60 kts
       Roll more than 60 kts

Question 12

VEL HOLD

Answer 12

Must be slower than 60 kts

Enhanced version of ATT mode

Question 13

Go around mode

Answer 13

75 kts
750 fpm

Climb rate has priority and will sacrifice airspeed, especially OEI

Question 14

What airspeed should you fly with dual AP failure in IMC?

Answer 14

125 KIAS

Question 15

What pitch does the tail rotor assume if both cables fail? What air speeds result in coordinated level flight?

Answer 15

-2 degrees

40 and 135 KIAS