CAA NZ Basic Turbine Knowledge (Helicopter) Exam study guide
CAA NZ Basic Turbine Knowledge (Helicopter) Exam · Work through your exam, one topic at a time.
The CAA NZ Basic Turbine Knowledge (Helicopter) examination is a multiple-choice theory assessment for people working towards a New Zealand aircraft maintenance engineer licence with a helicopter turbine rating. It tests the foundational knowledge a licensed engineer needs before certifying maintenance on turbine-powered helicopters: how a gas turbine produces power, how its modules are built and cooled, how fuel, oil, ignition and control systems work, and how that power is delivered through the main rotor drive, tail rotor drive and freewheeling unit. The CAA NZ Basic Turbine Knowledge (Helicopter) Exam study guide has 13 sections and about 3,933 words.
01Turbine Engine Fundamentals and Thermodynamics
Turbine Engine Fundamentals and Thermodynamics is the section that tests whether you can explain where shaft power comes from, why pressure ratio drives efficiency, and why temperature limits are not negotiable. Helicopter engines use the Brayton cycle, but the free power turbine and torque limits shape how the cycle is operated.
345 words, about 2 min02Engine Construction
Engine Construction tests how modules are built, aligned, sealed and mounted, and why material choice and clearances matter. In a helicopter, the engine is attached through mounts and a drive coupling; construction details affect vibration, fire safety and maintenance access.
310 words, about 2 min03Compressors
Compressors tests the difference between axial and centrifugal stages, how pressure ratio builds, and why surge, stall and bleed valves matter. Helicopter engines commonly use a centrifugal or mixed axial-centrifugal compressor, often with two stages.
303 words, about 2 min04Combustion and Turbines
Combustion and Turbines covers the hot section: how fuel is mixed and burned, how the flame is stabilised, and how turbine stages extract work without exceeding metal limits. Combustor types include annular, can-annular and reverse-flow; all use a primary zone, intermediate zone and dilution or cooling air.
306 words, about 2 min05Lubrication
Lubrication tests the oil system's job: supply clean, cool oil at the right pressure to bearings and gears, then scavenge it and detect distress. In helicopter engines and transmissions, oil condition is a primary health indicator.
289 words, about 1 min06Fuel Systems and Engine Indication
Fuel Systems and Engine Indication tests how fuel is stored, boosted, metered and sprayed, and how cockpit indications let you judge power and health. In a helicopter, torque is often the primary power indication, with N1, N2, TGT and fuel flow as supporting parameters.
294 words, about 1 min07Ignition
Ignition tests the high-energy system that lights the combustor during start and provides relight capability in flight. Helicopter turbines usually have two igniter plugs and a high-energy exciter.
286 words, about 1 min08Starting and Engine Control Systems
Starting and Engine Control Systems tests the start sequence, the electronic or hydromechanical control, and the protections that prevent a hot or hung start. The examiner expects sequence logic, not just button-pushing.
287 words, about 1 min09Helicopter Power Transmission
Helicopter Power Transmission covers the path from engine output to main and tail rotors: shafts, couplings, gearboxes, bearings and the mounts that carry torque and thrust. The exam tests power, torque and gear ratio relationships, plus alignment and inspection.
294 words, about 1 min10Rotor Drive and Freewheeling Units
Rotor Drive and Freewheeling Units tests the mechanism that lets the rotor turn without the engine and prevents the engine from being driven by the rotor. The freewheel unit is central to autorotation safety.
322 words, about 2 min11Engine and Transmission Monitoring
Engine and Transmission Monitoring tests how you use indications and trends to detect degradation before a failure. The exam expects you to distinguish a transient from a trend, and a sensor fault from a real exceedance.
300 words, about 2 min12Limits and Abnormal Operations
Limits and Abnormal Operations tests the numbers and the decisions: what is continuous, what is transient, what requires a shutdown, and what must be recorded. Limits exist to protect turbine blades, casings and transmission components.
293 words, about 1 min13Maintenance Practices, Safety and Airworthiness Requirements
Maintenance Practices, Safety and Airworthiness Requirements tests the rules that keep a turbine helicopter legally and physically airworthy. In the NZ system, maintenance must be performed and certified under the applicable CAA rules, with approved data and recorded in the appropriate maintenance records.
304 words, about 2 min