🚁 DECK 4 — Systems (General, Not Type-Specific) Flashcards by Brian Johnson

Q

Main drive system components?

A

Transmission, driveshafts, freewheeling unit, gearboxes.

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Q

Purpose of transmission?

A

Reduce engine RPM to rotor speed.

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Q

Purpose of freewheeling unit?

A

Allows autorotation by disengaging engine during failure.

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Q

Purpose of tail rotor drive?

A

Counter main rotor torque.

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Q

Purpose of hydraulic system?

A

Reduce control forces.

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Q

Effect of hydraulic failure?

A

Controls stiffen but remain operable.

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Q

Governor failure symptoms?

A

RPM drift needing manual throttle.

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Q

Purpose of stabilizer bar/flybar?

A

Provides attitude stability.

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Q

Benefit of FADEC?

A

Automatic engine and fuel control.

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Q

Purpose of aircraft battery?

A

Starting and emergency power.

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Q

Purpose of alternator/generator?

A

Power electrical buses.

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Q

Define correlation system.

A

Matches throttle to collective.

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Q

Anti-ice vs de-ice?

A

Prevent vs remove ice.

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Q

Pitot-static provides what?

A

IAS, altimeter, VSI.

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Q

Why hover in rain risky?

A

Visual reference loss.

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Q

Main rotor hub types?

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A

Fully articulated, semi-rigid, rigid.

Q

Fully articulated rotor allows what?

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A

Independent flap, lag, feather.

Q

Semi-rigid rotor allows what?

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A

Flap and teeter.

Q

Rigid rotor advantage?

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A

Excellent maneuverability.

Q

Rigid rotor disadvantage?

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A

More vibration transmitted.

Q

Purpose of droop stops?

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A

Limit flapping at low RPM.

Q

Purpose of chip detector?

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A

Detect metal in gearbox oil.

Q

Why is lubrication critical?

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A

Prevent gearbox failure.

Q

Fuel system flow?

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A

Tank → pumps → filters → engine.

Boost pump failure result?

Possible fuel starvation.