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Key Facts: CAA NZ CPL Aircraft Technical Knowledge Exam

50 Qs

Official CAA NZ exam question count.

Aspeq / CAA NZ Syllabus

120 Mins

Time allowed for the examination.

CAA NZ Examination Guide

70%

Minimum pass mark required.

CAA NZ Part 61

$108 NZD

Exam fee per attempt.

Aspeq Booking Portal

CAA NZ CPL General Aircraft Technical Knowledge is a 50-question, 120-minute examination requiring a 70% passing grade, administered by Aspeq under CAA New Zealand regulations.

Sample CAA NZ CPL Aircraft Technical Knowledge Practice Questions

Try these sample questions to review concepts for the CAA NZ CPL Aircraft Technical Knowledge exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the primary difference in power source between a turbocharger and a mechanical supercharger in piston aircraft engines?

A.A turbocharger is driven by engine exhaust gases, whereas a supercharger is mechanically driven by the engine crankshaft

B.A turbocharger is driven by an electric motor, whereas a supercharger uses hydraulic fluid pressure

C.A turbocharger is gear-driven from the accessory gearbox, whereas a supercharger utilizes ram air pressure

D.A turbocharger operates using engine oil pressure, whereas a supercharger is powered by cabin bleed air

Explanation: A turbocharger utilizes energy from expanding engine exhaust gases passing through a turbine to drive a centrifugal compressor. In contrast, a supercharger is mechanically driven directly from the engine crankshaft via gears or belts, which consumes internal engine horsepower (parasitic drag).

2How is 'critical altitude' defined for a turbocharged piston aircraft engine?

A.The maximum altitude at which a turbocharged engine can produce its maximum rated sea-level manifold pressure at full throttle

B.The altitude at which the wastegate opens completely to prevent cylinder overpressurisation

C.The minimum altitude required for the turbocharger intercooler to operate efficiently

D.The altitude at which the engine transitions from rich to lean mixture auto-metering

Explanation: Critical altitude is the maximum altitude at which a supercharged or turbocharged engine can maintain its maximum rated sea-level manifold pressure (or maximum continuous power) at a specified RPM with the wastegate fully closed.

3What happens to engine manifold pressure during a climb above the critical altitude with full throttle selected?

A.Manifold pressure decreases continuously as ambient atmospheric density decreases

B.Manifold pressure remains constant up to the aircraft service ceiling

C.Manifold pressure increases rapidly due to colder ambient air entering the compressor

D.Manifold pressure fluctuates violently due to differential pressure controller lockout

Explanation: Above critical altitude, the wastegate is already fully closed. Because ambient atmospheric pressure and density continue to drop with increasing altitude, the turbocharger compressor can no longer maintain maximum rated manifold pressure, causing MP to decrease as altitude increases.

4What is the primary function of an intercooler (charge air cooler) in a turbocharged engine installation?

A.To cool compressed intake air, increasing charge air density and reducing the risk of engine detonation

B.To cool turbocharger bearing oil before returning it to the engine oil sump

C.To condense moisture out of induction air to prevent fuel injector icing

D.To warm incoming ram air using turbine exhaust gas before it enters the compressor

Explanation: Compressing intake air in a turbocharger raises its temperature significantly (Charles's law/adiabatic compression). An intercooler lowers the temperature of this compressed air before it enters the cylinders, which increases air density (improving volumetric efficiency) and lowers peak combustion temperatures to prevent detonation.

5What is the function of the wastegate in a turbocharged aircraft piston engine?

A.To regulate the volume of exhaust gas directed through the turbocharger turbine, controlling compressor output pressure

B.To dump excess induction manifold air directly overboard during engine deceleration

C.To vent unburned fuel vapor out of the exhaust pipe during engine shutdown

D.To bypass high-pressure oil around the turbocharger bearing assembly during cold starts

Explanation: The wastegate is a controllable valve positioned in the engine exhaust bypass duct. By opening or closing, it regulates how much exhaust gas flows through the turbine wheel versus bypassing directly to the exhaust pipe, thereby controlling turbine speed and intake compressor manifold pressure.

6In what position is the wastegate when a turbocharged engine is operating at maximum boost or critical altitude?

A.Fully closed

B.Fully open

C.Halfway open (50% position)

D.Cycling continuously between open and closed

Explanation: When maximum boost is required or when climbing at critical altitude, the wastegate is fully closed. This forces 100% of the exhaust gas through the turbine housing to drive the compressor at maximum speed.

7What term describes the undesirable transient fluctuation of manifold pressure and engine RPM caused by pilot throttle movement in manually wastegated systems?

A.Bootstrapping

B.Thermal shock

C.Vapor lock

D.Detonation

Explanation: Bootstrapping is a phenomenon where a change in engine power causes a change in exhaust gas flow, which changes turbine speed, manifold pressure, and fuel flow, setting off a feedback cycle of surging manifold pressure and RPM until stabilized.

8Why must a pilot avoid rapid throttle movements when operating a turbocharged piston aircraft engine?

A.To prevent transient engine overboost and severe mechanical stress on cylinder components

B.To prevent immediate oil starvation to the main crankshaft bearings

C.To prevent the propeller governor from locking into the feather position

D.To prevent automatic shutdown of the dual magneto ignition system

Explanation: Rapid throttle advancement causes a sudden surge in exhaust gas volume, which can spin up the turbocharger faster than the wastegate controller can respond. This results in an overboost condition, exceeding maximum allowable manifold pressure limits and risking cylinder head structural damage.

9What is a major advantage of a continuous-flow fuel injection system compared to a float-type carburetor?

A.Elimination of induction icing caused by fuel evaporation in a carburetor throat

B.Complete elimination of any need for an engine-driven fuel pump

C.Ability to operate on low-octane automotive gasoline without detonation risk

D.Automatic adjustment for propeller pitch changes during acrobatic maneuvers

Explanation: Fuel injection systems inject fuel directly into the intake port near each cylinder valve rather than into a central carburetor venturi. This eliminates carburetor throat icing caused by fuel evaporation and venturi pressure drop.

10What is the primary function of the engine oil pressure relief valve?

A.To prevent excessive system oil pressure when engine RPM is high or oil is cold and viscous

B.To bypass oil around the oil cooler matrix during high-speed cruise flight

C.To scavenge excess oil from the lower crankcase directly back to the oil reservoir

D.To maintain constant oil flow to the turbocharger wastegate actuator during engine shutdown

Explanation: The spring-loaded oil pressure relief valve opens when system oil pressure exceeds a predetermined maximum limit (such as during cold starts or high RPM), routing excess oil back to the inlet side of the pump or crankcase sump to prevent damage to oil lines and coolers.

About the CAA NZ CPL Aircraft Technical Knowledge Exam

The CAA NZ CPL General Aircraft Technical Knowledge examination assesses commercial pilot candidates on advanced piston engines, supercharging, turbocharging, wastegate controllers, fuel injection, detonation, oil systems, constant speed unit (CSU) governor physics, feathering, pitch lock, beta range, hydraulics, pneumatics, landing gear actuation, AC/DC electrical generation, bus bars, inverters, environmental & pressurisation systems, oxygen systems, pitot-static instruments, ADC, AHRS, and EFIS glass cockpit systems.

Exam sponsor: Civil Aviation Authority of New Zealand (exams via Aspeq). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

50 multiple-choice questions delivered via Aspeq CBT in 120 minutes.

Time Limit

120 minutes

Passing Score

70%

Exam / Certification Fees

$108 NZD

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

30%

Advanced Piston Engines & Systems

Supercharging and turbocharging mechanisms, manifold pressure control, wastegate controllers (density and differential pressure), RSA continuous-flow fuel injection, detonation, pre-ignition, thermal shock prevention, and dry/wet sump oil systems.

25%

Propellers & Constant Speed Units

CSU governor physics (flyweights, pilot valve, speeder spring, forces), feathering and unfeathering accumulators, centrifugal locks, pitch lock safety features, beta range, and reverse pitch operations.

25%

Aircraft Systems & Power Distribution

Hydraulic systems (Pascal's law, pumps, accumulators, fuses), pneumatic systems, landing gear actuation and free-fall emergency extension, AC/DC electrical generation, essential and non-essential bus bars, inverters, environmental/pressurisation systems, and oxygen systems.

20%

Pitot-Static & Flight Instruments

Pitot-static instrument operating principles and blockages, Air Data Computer (ADC) inputs/outputs and corrections, Attitude and Heading Reference System (AHRS) solid-state sensors, and Electronic Flight Instrument System (EFIS) glass cockpit architectures.

Preparing for the CAA NZ CPL Aircraft Technical Knowledge Exam

What You Need to Know

Passing score: 70%
Assessment: 50 multiple-choice questions delivered via Aspeq CBT in 120 minutes.
Time limit: 120 minutes
Exam / certification fees: $108 NZD Official sources

Using Our Practice Resources

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CAA NZ CPL Aircraft Technical Knowledge: Suggested Study Strategy

1Understand the operational differences between ground-boosted and turbo-normalized engines, and the role of critical altitude.

2Master wastegate control mechanics, including how the density controller and differential pressure controller work together to prevent overboost.

3Memorize constant speed governor physics: how flyweight centrifugal force balances speeder spring tension to regulate oil flow to the propeller pitch cylinder.

4Distinguish between Alpha range and Beta range operation, including low pitch stops and reverse pitch control.

5Learn the electrical bus distribution hierarchy (essential, main, non-essential, avionics) and how bus tie breakers isolate electrical faults.

6Analyze pitot-static blockages (drain hole vs pitot pressure entry vs static port) and how ADC, AHRS, and EFIS reversionary modes operate in glass cockpits.

Frequently Asked Questions

What is the CAA NZ CPL General Aircraft Technical Knowledge exam?

It is a mandatory ground theory examination administered by Aspeq for commercial pilot license candidates under CAA New Zealand Part 61 rules.

What is the pass mark and time limit?

Candidates must score at least 70% within the 120-minute time limit for the 50 multiple-choice questions.

What key topics are covered on the CPL AGK syllabus?

Topics include turbocharged piston engines, fuel injection, constant speed units (CSU), feathering/Beta range, hydraulic and pneumatic systems, electrical buses and inverters, pressurisation, oxygen systems, pitot-static errors, ADC, AHRS, and glass cockpit EFIS displays.

How much does the exam cost?

The examination sitting fee is $108 NZD per attempt booked through the Aspeq examination portal.