AQC IV: Flight Controls

Question 1

How are control inputs transferred from the cockpit to the rotor blades?

Answer 1

cyclic/collective are hydro-mechanically linked to the swashplate and hydraulic servos
tail rotor pedals are mechanically linked to the tail rotor

Question 2

The pilot’s cyclic differs from the co-pilot’s because it includes:

Answer 2

wheel brake lever, counter-weights

Question 3

What is the purpose of the longitudnal hydraulic stop?

Answer 3

Prevent main rotor from striking the tail boom during taxi and ground runs. Limits aft movement of swashpate to 2 deg +/- 12 sec

Question 4

The combined linkage for the main rotor collective pitch and the engine throttles is designed for what?

Answer 4

vary main rotor thrust and engine power simultaneously without changing NR

Question 5

What items are found only on the pilot’s collective?

Answer 5

Engine condition levers, cargo release button, hydraulic friction clutch wheel

Question 6

What is the purpose of the ECLs?

Answer 6

Allow pilot to change engine power independently of the other engine without changing collective pitch

Question 7

What is the purpose of the tail rotor?

Answer 7

directional control/anti-torque

heading control in a hover, yaw control in coordinated flight

Question 8

What is the purpose of the tail rotor pitch limiter system?

Answer 8

limit T/R pitch based on ambient temp/PA to prevent overload of the T/R drive system/tail boom

Question 9

How many flight control servos are installed in the flight control system?

Answer 9

4; 
3xKAU-30...longitudnal, lateral, collective
1xRA-60B T/R servos
LTC-L
Longitudinal, T/R, Collective, Lateral

Question 10

What is the hydraulic servo operating pressure range?

Answer 10

42 +/-3 – 65 +8/-2 kgf/cm2

Question 11

What is the max allowable hydraulic fluid leakage through seals when operating and when stationary with operating pressure?

Answer 11

4 cubic cm per hour operating

4 cubic cm per 24hr when static

Question 12

What is the purpose of the intermediate bellcranks?

Answer 12

strenghten vertical section of the control run

Question 13

Where are cable runs used in the control systems?

Answer 13

rotor brake, engine fuel shutoff valve, directional control hydraulic servo to tail rotor gearbox

Question 14

What is the purpose of the subpedal micro switches?

Answer 14

allow pilot to introduce directional control inputs while autopilot yaw channel is engaged

Question 15

What is the purpose of the N2 trim control?

Answer 15

electrical/mechanical link to N2 control levers on FCU ; change N2->Nr without changing N1.

Question 16

What is the max allowable tail rotor blade pitch angle with the shaft of the tail rotor pitch limiter fully retracted? Fully extended?

Answer 16

23 deg

17 deg 20 +/- 25 seconds