SACAA ATPL(H) Aircraft Technical & General Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Aircraft Technical & General Knowledge Examination Exam - SACAA ATPL(H) Aircraft Technical & General Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Aircraft Technical & General Knowledge Examination Exam

Question 1

In a free-turbine turboshaft engine utilized in multi-engine helicopters, what is the fundamental mechanical relationship between the gas generator turbine (N1/Ng) and the power turbine (N2/Np)?

They \are mechanically decoupled and connected only aerodynamically by the gas flow They \are rigidly mounted on a single common shaft rotating at identical RPM They \are connected through a fixed 2:1 reduction gear train inside the accessory gearbox They \are synchronized electronically via the FADEC through a torque-converter clutch

Correct Answer:

They \are mechanically decoupled and connected only aerodynamically by the gas flow

Question 2

When the collective pitch is increased on a multi-engine turbine helicopter, how does a free-turbine engine governor maintain constant rotor RPM (NR / N2)?

It senses the impending drop in N2/NR speed and increases fuel flow to increase N1/Ng speed and gas energy It increases power turbine shaft pitch to match the increased main rotor resistance directly It opens variable inlet guide vanes (VIGVs) to bypass excess gas \around the power turbine stage It mechanically advances the N2 turbine governor flyweights to increase power turbine gear ratio

Correct Answer:

It senses the impending drop in N2/NR speed and increases fuel flow to increase N1/Ng speed and gas energy

Question 3

What is the primary operational advantage of a dual-spool gas generator (N1 low-pressure spool and N2 high-pressure spool) in advanced turboshaft engines?

Higher compressor pressure ratios with improved stall margins and better acceleration response across operating altitudes Direct mechanical drive of the tail rotor from the low-pressure spool without needing a combining gearbox Elimination of the need for an oil lubrication system on the high-pressure spool bearings Ability to run the compressor in reverse direction during autorotation to generate zero drag

Correct Answer:

Higher compressor pressure ratios with improved stall margins and better acceleration response across operating altitudes

Question 4

In a dual-channel Full Authority Digital Engine Control (FADEC) system on a multi-engine helicopter, how \are control commands executed during normal operation?

One channel is active controlling engine parameters while the second channel operates in standby, cross-checking computations Both channels command separate fuel metering valves simultaneously, summing their outputs mechanically Channel A controls engine N1 speed while Channel B independently controls N2 speed without data sharing The active channel alternates every 60 seconds automatically during flight to balance electronic component wear

Correct Answer:

One channel is active controlling engine parameters while the second channel operates in standby, cross-checking computations

Question 5

What happens if a dual-channel FADEC system suffers a total electrical failure or dual channel loss in flight on a turbine helicopter equipped with hydromechanical backup?

The system freezes the fuel metering valve at its last valid position or reverts to manual hydro-mechanical control The engine immediately shuts down and cannot be restarted until ground maintenance clears the ECU fault memory The engine accelerates uncontrollably to maximum overspeed until the mechanical N2 governor trips the shutoff valve The standby FADEC channel drains hydraulic pressure to force the fuel control lever to flight idle

Correct Answer:

The system freezes the fuel metering valve at its last valid position or reverts to manual hydro-mechanical control

Question 1

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Prepare with the SACAA ATPL(H) Aircraft Technical & General Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Aircraft Technical & General Knowledge Examination Exam practice quiz. This question bank includes 100 questions covering helicopter, engine, hydraulic, flight, and turbine. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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SACAA ATPL(H) Aircraft Technical & General Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Aircraft Technical & General Knowledge Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on helicopter, engine, hydraulic, flight, and turbine. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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SACAA ATPL(H) Aircraft Technical & General Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Aircraft Technical & General Knowledge Examination Exam

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