Ground Resonance - Knowledge Check

Question 1 of 7

1. Question

Ground resonance occurs primarily in which type of rotor system?

Semi-rigid teetering

Correct Incorrect Correct answer

Rigid

Correct Incorrect Correct answer

Fully articulated

Correct Incorrect Correct answer

Coaxial

Correct Incorrect Correct answer

Question 2 of 7

2. Question

Fill in the blank.

In a fully articulated rotor system, the Fill in the blank 1 of 1 hinge allows each blade to rotate slightly faster or slower than the mast.

Question 3 of 7

3. Question

Put the development of ground resonance in the correct order.

Correct Correct Answer Incorrect

View Answers:

Question 4 of 7

4. Question

Match each situation to the correct action.

Sort elements

Take off to a hover
Shut down the engine and apply the rotor brake
No special action; the imbalance works itself out

Rotor RPM at or near takeoff speed, such as just after landing

Correct Incorrect Correct answer

Rotor RPM too low to hover, such as during startup or shutdown

Correct Incorrect Correct answer

Helicopter already in the air with a temporary rotor imbalance

Correct Incorrect Correct answer

Question 5 of 7

5. Question

Which statements about ground resonance are correct? (Select all that apply.)

Ground contact is required for it to develop

Correct Incorrect Correct answer

The engine adds power to the situation by keeping the blades spinning

Correct Incorrect Correct answer

Hesitation in taking corrective action can lead to catastrophic damage

Correct Incorrect Correct answer

It is a common problem for fully articulated helicopters in flight

Correct Incorrect Correct answer

Question 6 of 7

6. Question

You're landing a fully articulated helicopter. One skid touches down hard, and a rapidly growing vibration starts while the rotor is still at flight RPM. What should you do?

Take off to a hover immediately

Correct Incorrect Correct answer

Lower the collective fully and wait for the vibration to stop

Correct Incorrect Correct answer

Shut down the engine and apply the rotor brake

Correct Incorrect Correct answer

Apply full aft cyclic

Correct Incorrect Correct answer

Question 7 of 7

7. Question

Why isn't ground resonance a problem once the helicopter is in the air?

The helicopter is free to vibrate in space, so a temporary imbalance works itself out

Correct Incorrect Correct answer

The lead/lag hinges lock once the helicopter is airborne

Correct Incorrect Correct answer

Rotor RPM is too high in flight for vibrations to form

Correct Incorrect Correct answer

The tail rotor dampens the vibration in flight

Correct Incorrect Correct answer

Ground Resonance - Knowledge Check

Quiz Summary

Information

Results

Results

Categories

1. Question

2. Question

3. Question

4. Question

Sort elements

5. Question

6. Question

7. Question

Leave a Comment Cancel reply