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AAK CPL (Kazakhstan) study materials
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AAK CPL (Kazakhstan) practice questions

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Question 1Air Law and ATC Procedures

Under the Kazakh Rules of the Air, which document establishes the general rules governing the flight and operation of civil aircraft in the airspace of the Republic of Kazakhstan?

  1. The Rules of Flight Operations in the Airspace of the Republic of Kazakhstan Correct answer.
  2. The Aerodrome Certification Manual issued for each international airport
  3. The Aircraft Maintenance Programme approved by the operator's CAMO
  4. The Airworthiness Directive Register of the Aviation Administration of Kazakhstan

Explanation

Flight rules, airspace use and ATC procedures in Kazakhstan are set out in the national Rules of Flight Operations in the Airspace of the Republic of Kazakhstan, issued under the authority of the aviation regulator. Airworthiness registers, aerodrome manuals and maintenance programmes deal with technical and ground matters rather than rules of flight. The flight rules document is the reference a pilot uses for airspace classification, clearances and separation.

Question 2Air Law and ATC Procedures

In controlled airspace, an ATC clearance issued to a pilot in Kazakhstan primarily serves which purpose?

  1. It transfers legal responsibility for terrain clearance from the pilot to the controller
  2. It replaces the need to comply with the aircraft's operating limitations
  3. It confirms that the aircraft's maintenance release is currently valid
  4. It authorises the flight under specified conditions and provides separation from other controlled traffic Correct answer.

Explanation

A clearance is an authorisation for a flight or portion of it to proceed under conditions specified by the controller, and it carries with it the provision of separation from other controlled traffic. Responsibility for terrain clearance and safe operation of the aircraft remains with the pilot in command. Clearances never override aircraft operating limitations or airworthiness requirements.

Question 3Air Law and ATC Procedures

A pilot reads back a route clearance and the controller replies "READ BACK CORRECT". What does this indicate?

  1. The read-back matches the clearance and the aircraft is expected to comply with it Correct answer.
  2. The controller wants the pilot to confirm the aircraft's present position
  3. The clearance has been cancelled and a new clearance will be issued later
  4. The read-back contained errors and a full re-issue of the clearance follows

Explanation

When a controller confirms that a read-back is correct, the clearance as read back is the clearance in force and the pilot must comply with it. If the read-back were wrong, the controller would correct it or re-issue the clearance. The phrase does not cancel the clearance or request position information.

Question 4Air Law and ATC Procedures

Which phraseology should a pilot use to report that the aircraft is unable to comply with a clearance or instruction?

  1. SAY AGAIN
  2. UNABLE Correct answer.
  3. DISREGARD
  4. STANDBY

Explanation

The standard response when an aircraft cannot comply with a clearance or instruction is the word UNABLE, normally followed by the reason. STANDBY means wait and the controller will call back, DISREGARD cancels a previously transmitted message, and SAY AGAIN requests repetition. Using UNABLE promptly allows the controller to issue an alternative clearance.

Question 5Air Law and ATC Procedures

An aircraft on an IFR flight in controlled airspace loses two-way radio communication. According to the general international procedure applied in Kazakhstan, what should the pilot do?

  1. Continue the flight according to the last acknowledged clearance or the filed flight plan and land as soon as practicable Correct answer.
  2. Squawk 7600 and maintain the last assigned level until intercepted
  3. Circle the last reported position until radio contact is restored
  4. Immediately descend below cloud and proceed visually to the nearest aerodrome

Explanation

In the event of communication failure, the aircraft should continue in accordance with the last received and acknowledged clearance, or if none, the route and levels in the filed flight plan, and land as soon as practicable. The pilot sets the appropriate SSR code to alert controllers. Leaving the assigned level without coordination would compromise separation.

Question 6Air Law and ATC Procedures

What does a flashing red light signal directed at an aircraft on the ground mean?

  1. Stop
  2. Return to starting point on the aerodrome
  3. Cleared to take off
  4. Taxi clear of the landing area in use Correct answer.

Explanation

For an aircraft on the ground, a flashing red light signal means taxi clear of the landing area in use. A steady red light means stop, and a flashing white light means return to the starting point. These light signals are used when radio communication is not available.

Question 7Air Law and ATC Procedures

Which SSR transponder code is used to indicate unlawful interference (hijacking)?

  1. 7500 Correct answer.
  2. 7700
  3. 7600
  4. 7000

Explanation

Code 7500 is the special code for unlawful interference. Code 7600 denotes radio communication failure and 7700 denotes a general emergency, while 7000 is the standard VFR code in many states. Selecting 7500 discreetly alerts ATC to a hijack situation.

Question 8Air Law and ATC Procedures

When should a pilot set the altimeter to the standard pressure setting of 1013.2 hPa?

  1. Only when flying below the transition level in the terminal area
  2. Whenever the aerodrome QNH differs from 1013.2 hPa
  3. When flying at or above the transition level, in accordance with the transition altitude Correct answer.
  4. Immediately after take-off regardless of the transition altitude

Explanation

The altimeter is set to standard pressure 1013.2 hPa when climbing through the transition altitude and remains on it at or above the transition level, giving flight levels. Below the transition altitude the altimeter is set to the aerodrome or area QNH. Setting standard pressure immediately after take-off would misplace the aircraft relative to terrain and other traffic.

Question 9Air Law and ATC Procedures

In Kazakhstan airspace, which altimeter setting is used for flight levels above the transition altitude?

  1. Area QNH
  2. Aerodrome QFE
  3. Aerodrome QNH
  4. Standard pressure 1013.2 hPa Correct answer.

Explanation

Above the transition altitude all aircraft use the standard pressure setting of 1013.2 hPa so that flight levels provide a common reference for vertical separation. QNH and QFE settings are used below the transition altitude where terrain and aerodrome elevation matter. Using a common standard pressure prevents altimeter errors between aircraft at the same nominal level.

Question 10Air Law and ATC Procedures

An aircraft is cleared to descend from FL 310 to FL 250. Which vertical separation minimum normally applies between it and other aircraft at these flight levels in Kazakh airspace?

  1. 3000 ft
  2. 1000 ft Correct answer.
  3. 2000 ft
  4. 500 ft

Explanation

Above the transition altitude, standard vertical separation between aircraft at flight levels is normally 1000 ft unless reduced vertical separation minima (RVSM) rules apply, in which case 1000 ft is used in the RVSM band as well. In the FL 250 to FL 310 band, 1000 ft separation is the standard. Larger values are not the routine minimum in this band.

Question 11Air Law and ATC Procedures

What does the term "transition level" mean in airspace where a transition altitude is established?

  1. The lowest flight level available for use above the transition altitude Correct answer.
  2. The highest altitude at which the local QNH may be used
  3. The altitude at which the aircraft first enters controlled airspace
  4. The level at which the aircraft must contact the approach controller

Explanation

The transition level is the lowest flight level available for use above the transition altitude, and it is normally specified by ATC. Below the transition altitude the local QNH is used; at and above the transition level standard pressure applies. It is not a point for radio contact or a boundary of controlled airspace.

Question 12Air Law and ATC Procedures

A pilot on an IFR flight is given a clearance that includes "CLIMB VIA SID". What does this authorise?

  1. Climbing unrestricted to the cleared level immediately after take-off
  2. Leaving the SID track to shorten the route at the pilot's discretion
  3. Climbing only after passing the SID's final waypoint
  4. Climbing on the published SID lateral and vertical profile while complying with all published restrictions Correct answer.

Explanation

A "climb via SID" clearance authorises the aircraft to follow the published lateral path and the published altitude and speed restrictions of the SID while climbing to the cleared level. The pilot must still comply with all published restrictions unless specifically cancelled by ATC. It does not permit leaving the SID track or ignoring level restrictions.

Question 13Air Law and ATC Procedures

Which of the following best describes the purpose of a holding pattern clearance limit?

  1. To set the minimum fuel required before commencing an approach
  2. To define the maximum altitude at which the aircraft may enter the terminal area
  3. To specify the fix at which the aircraft is to hold and the levels and leg times to be used Correct answer.
  4. To identify the aerodrome to which the aircraft must divert in an emergency

Explanation

A holding clearance identifies the holding fix, the inbound track, the level or levels to be used and the leg time or distance. It is a means of delaying the aircraft in a predictable pattern while maintaining separation. It does not set diversion aerodromes or minimum fuel figures.

Question 14Air Law and ATC Procedures

In the event of an emergency, which transponder code should be selected to alert ATC?

  1. 7600
  2. 7700 Correct answer.
  3. 7500
  4. 2000

Explanation

Code 7700 is the general emergency code and is selected to alert ATC to an emergency such as engine failure, decompression or medical urgency. Code 7500 indicates unlawful interference and 7600 indicates communication failure. Code 2000 is used when no other code has been assigned.

Question 15Air Law and ATC Procedures

A pilot is instructed to "SQUAWK IDENT". What action is required?

  1. Change the transponder code to the emergency code
  2. Switch the transponder to standby mode briefly
  3. Set the transponder to altitude reporting only
  4. Press the identification button on the transponder so the reply is highlighted on the controller's display Correct answer.

Explanation

The instruction to squawk ident requires the pilot to activate the identification feature of the transponder, which highlights the reply on the radar display so the controller can confirm the aircraft's identity. It does not change the assigned code or the operating mode. The code remains as previously assigned.

Question 16Air Law and ATC Procedures

What is the meaning of the ATC instruction "LINE UP AND WAIT" given to an aircraft at the holding point of a runway?

  1. Hold at the holding point until the controller calls back
  2. Enter the runway and take off, then report airborne
  3. Enter the runway and position for take-off, but do not commence take-off until further clearance Correct answer.
  4. Commence take-off immediately because the runway is clear

Explanation

Line up and wait authorises the aircraft to enter the runway and position itself for take-off, but take-off must not begin until an explicit take-off clearance is received. It is not an instruction to wait at the holding point, which is covered by "hold position". The pilot must remain ready to depart on receipt of clearance.

Question 17Air Law and ATC Procedures

An aircraft is cleared to land on a runway where another aircraft is still vacating. Which statement reflects correct application of runway safety rules?

  1. The landing aircraft may land as long as the other aircraft has reported vacated to the tower
  2. The landing aircraft may continue only if the controller has confirmed the runway will be clear and the pilot judges a safe landing is assured Correct answer.
  3. The landing aircraft must always go around whenever another aircraft is on the runway
  4. The landing aircraft should reduce speed and land beyond the vacating aircraft

Explanation

A landing clearance remains valid only while the runway is expected to be clear; the pilot must be prepared to go around if a safe landing is not assured. The controller issues the clearance based on anticipated separation and confirms the runway will be vacated. Landing beyond another aircraft on the same runway is not a safe assumption.

Question 18Air Law and ATC Procedures

What does the abbreviation ATIS stand for in air traffic services?

  1. Aerodrome Traffic Information Summary
  2. Automatic Terminal Information Service Correct answer.
  3. Air Traffic Integration System
  4. Approach Traffic Identification Service

Explanation

ATIS stands for Automatic Terminal Information Service, a continuous broadcast of recorded non-control information such as weather, runway in use and altimeter setting. Pilots use it to reduce radio workload before contacting ATC. The other expansions are invented and do not describe the service.

Question 19Air Law and ATC Procedures

When must a pilot of a departing IFR flight contact the aerodrome control tower for start-up and pushback clearance at a controlled aerodrome?

  1. Before starting engines or moving the aircraft from the stand, unless the aerodrome has a separate start-up procedure Correct answer.
  2. Only after the aircraft has left the apron and is on the taxiway
  3. Immediately after take-off when airborne
  4. Only when the aircraft is ready to enter the runway

Explanation

At controlled aerodromes, start-up and pushback clearance is normally requested before engines are started or the aircraft is moved from the stand, unless a separate start-up procedure or ground frequency exists. This allows the controller to manage apron and taxiway congestion. Contacting the tower only on the taxiway or at the runway would bypass that coordination.

Question 20Air Law and ATC Procedures

Which condition must be met before a pilot may enter Class C controlled airspace in Kazakhstan?

  1. The aircraft must be VFR and remain clear of cloud at all times
  2. An ATC clearance must be obtained and the aircraft must be equipped and the pilot qualified for the flight Correct answer.
  3. The pilot must only monitor the appropriate frequency without establishing contact
  4. A flight plan must be filed but no clearance is required

Explanation

Class C airspace requires an ATC clearance for entry and provides separation between IFR flights and between IFR and VFR flights. The aircraft must be suitably equipped and the pilot appropriately qualified for the intended flight. Monitoring the frequency without contact or entering without clearance is not permitted.

Question 21Aircraft General Knowledge (Airframe, Systems, Powerplant)

On a light aircraft with a fixed-pitch propeller, what happens to engine RPM when the aircraft enters a climb at constant throttle setting?

  1. RPM increases because the propeller loads up
  2. RPM decreases because the forward speed and hence blade angle of attack fall Correct answer.
  3. RPM decreases because the mixture leans automatically
  4. RPM stays exactly constant because throttle is unchanged

Explanation

With a fixed-pitch propeller the blade angle is constant, so RPM depends on the balance between engine power and propeller load. In a climb the lower true airspeed reduces the propeller's angle of attack and its absorbed power, so the engine speeds up or, more precisely, the RPM tends to rise unless the throttle is reduced; at constant throttle the engine unloads and RPM increases. Candidates should recall the inverse relationship between forward speed and RPM for a fixed-pitch propeller.

Question 22Aircraft General Knowledge (Airframe, Systems, Powerplant)

In a four-stroke aircraft engine, which stroke follows the power (combustion) stroke?

  1. Exhaust stroke Correct answer.
  2. Induction stroke
  3. Compression stroke
  4. Intake stroke

Explanation

The four-stroke cycle runs intake, compression, power, exhaust in that order. After the power stroke the piston rises and pushes burnt gases out through the open exhaust valve, so the exhaust stroke follows combustion. Recognising the sequence is fundamental to understanding valve timing and engine operation.

Question 23Aircraft General Knowledge (Airframe, Systems, Powerplant)

What is the primary purpose of the magneto in a piston aero-engine?

  1. To generate the high-tension voltage that fires the spark plugs independently of the aircraft battery Correct answer.
  2. To step up battery voltage for the starter motor
  3. To regulate the alternator output during flight
  4. To provide the low-tension current for the fuel pump

Explanation

A magneto is a self-contained generator driven by the engine that produces high-tension pulses for the spark plugs. Because it needs no external battery, the ignition continues to work even if the aircraft's electrical system fails. This independence is why twin magnetos are used for redundancy.

Question 24Aircraft General Knowledge (Airframe, Systems, Powerplant)

Which statement best describes the function of the carburettor heat control in a float-type carburettor installation?

  1. It enriches the mixture for take-off at high density altitude
  2. It admits heated air to the carburettor to prevent or clear induction icing Correct answer.
  3. It cools the fuel before it reaches the venturi
  4. It bypasses the air filter during ground operation

Explanation

Carburettor heat ducts air across an exhaust-heated muff before it enters the carburettor, raising the air temperature to melt or prevent ice in the venturi and throttle area. It is a anti-icing device, not a mixture or performance control. Pilots must remember that applying heat also enriches the mixture and reduces power.

Question 25Aircraft General Knowledge (Airframe, Systems, Powerplant)

What is the primary structural function of the spar in an aircraft wing?

  1. To attach the aileron hinges to the trailing edge
  2. To carry the bending loads from lift and transmit them to the fuselage Correct answer.
  3. To seal the fuel tank cavity from the airstream
  4. To provide a mounting surface for the wing tip navigation light

Explanation

The spar is the main longitudinal beam of the wing and resists the bending moment produced by lift. It carries these loads inboard to the wing root and fuselage attachment fittings. Ribs and skin contribute to shape and torsion but the spar is the primary bending member.

Question 26Aircraft General Knowledge (Airframe, Systems, Powerplant)

In a simple hydraulic brake system, what is the effect of air in the brake lines?

  1. It makes the brake pedal or lever feel spongy and reduces braking effectiveness Correct answer.
  2. It increases braking force because air is compressible
  3. It automatically bleeds itself during normal operation
  4. It has no effect because the system is sealed

Explanation

Hydraulic fluid is essentially incompressible, which allows pressure applied at the master cylinder to be transmitted directly to the wheel cylinder. Air is compressible, so it absorbs part of the applied pressure and gives a spongy feel with reduced braking. The system must be bled to remove air.

Question 27Aircraft General Knowledge (Airframe, Systems, Powerplant)

Which of the following is the correct description of the electrical bus bar in a light aircraft?

  1. A common distribution point connecting the power source to the various electrical loads Correct answer.
  2. A device that converts AC to DC
  3. A relay that disconnects the battery during engine start
  4. A resistor used to limit current to the starter

Explanation

The bus bar is a conductive bar that distributes electrical power from the battery or alternator to the individual circuit breakers and loads. It is a distribution node rather than a converter or a switching device. Understanding the bus helps in diagnosing electrical failures.

Question 28Aircraft General Knowledge (Airframe, Systems, Powerplant)

During a pre-flight inspection a pilot finds the engine oil level at the minimum mark on the dipstick. What is the correct action?

  1. Depart normally because the minimum mark is the operating limit
  2. Top up with the grade specified in the aircraft manual before flight Correct answer.
  3. Drain and replace all oil to avoid contamination
  4. Run the engine for five minutes to circulate oil and then depart

Explanation

The minimum mark indicates the lowest acceptable level, but operating at that level leaves little margin for consumption during flight. The correct action is to replenish with the approved oil grade to the specified level before departure. Running the engine does not restore oil quantity.

Question 29Aircraft General Knowledge (Airframe, Systems, Powerplant)

An aircraft is parked at an airfield with a high outside air temperature and high humidity. Which condition most favours carburettor icing during taxi and take-off?

  1. Low humidity and high temperature
  2. High temperature alone with low humidity
  3. High humidity and moderate temperature with a cold carburettor venturi Correct answer.
  4. Very cold dry air below minus 20 degrees Celsius

Explanation

Carburettor icing occurs when fuel vaporisation and venturi depression cool the air below its dew point, allowing moisture to freeze. High humidity supplies the moisture and moderate temperatures allow the required cooling without the air already being too cold and dry. Very cold dry air contains little moisture and is less favourable.

Question 30Aircraft General Knowledge (Airframe, Systems, Powerplant)

What is the main consequence of a partially blocked air filter on a normally aspirated piston engine?

  1. The engine oil pressure rises sharply
  2. The mixture becomes richer because the reduced airflow increases the fuel-to-air ratio Correct answer.
  3. The magneto timing advances automatically
  4. The mixture becomes leaner because less air enters the carburettor

Explanation

A blocked filter restricts airflow into the carburettor while the fuel metering remains roughly proportional to airflow, but the reduced mass of air with the same fuel flow enriches the mixture. The engine may run rough and lose power. Pilots should recognise this as a possible cause of rich running.

Question 31Aircraft General Knowledge (Airframe, Systems, Powerplant)

In a constant-speed propeller system, what does the governor do when engine RPM tends to exceed the selected value?

  1. It decreases blade pitch to unload the engine
  2. It opens the throttle valve automatically
  3. It advances the ignition timing
  4. It increases blade pitch to absorb more power and reduce RPM Correct answer.

Explanation

The governor senses RPM and adjusts oil pressure to the propeller hub to change blade angle. When RPM rises above the selected value, the governor increases blade pitch, which increases the aerodynamic load and brings RPM back to the setting. This is a closed-loop speed control.

Question 32Aircraft General Knowledge (Airframe, Systems, Powerplant)

Why does an aircraft fuel system include a fuel selector valve with a BOTH position on some light twins?

  1. To permit both engines to feed from both tanks, but with the risk of cross-feeding and fuel starvation if a tank runs dry Correct answer.
  2. To allow both engines to draw from either tank simultaneously for balance
  3. To bypass the fuel strainer during descent
  4. To increase fuel pressure at the carburettor

Explanation

A BOTH selection lets both engines draw from both tanks, which can help balance fuel but means a single empty or failed tank can affect both engines. Many type manuals restrict or prohibit BOTH for take-off and landing for this reason. Pilots must know the specific aircraft's limitations.

Question 33Aircraft General Knowledge (Airframe, Systems, Powerplant)

What is the purpose of the crankcase breather in a piston aero-engine?

  1. To supply pressurised air to the carburettor
  2. To cool the oil cooler
  3. To vent blow-by gases and pressure from the crankcase to the atmosphere Correct answer.
  4. To return fuel vapour to the fuel tank

Explanation

Combustion gases that leak past the piston rings raise crankcase pressure and can force oil past seals. The breather vents these gases overboard, usually through a separator, maintaining near-atmospheric crankcase pressure. A blocked breather can cause oil loss and seal damage.

Question 34Aircraft General Knowledge (Airframe, Systems, Powerplant)

An engine monitor shows a sudden rise in cylinder head temperature on one cylinder while the others remain normal. Which cause is most likely?

  1. A faulty spark plug in that cylinder causing misfiring and reduced cooling
  2. A failed alternator
  3. A partially blocked fuel injector nozzle on that cylinder Correct answer.
  4. A low oil level affecting all cylinders equally

Explanation

A partially blocked injector leans that cylinder, and a lean mixture burns hotter, raising CHT on that cylinder alone. Because the effect is localised, the cause is most likely in that cylinder's fuel or ignition. A failed alternator or low oil level would affect the whole engine.

Question 35Aircraft General Knowledge (Airframe, Systems, Powerplant)

What does the term 'washout' refer to when inspecting a wooden or fabric-covered wing?

  1. The drainage of water from the wing root
  2. A reduction in the angle of incidence toward the wing tip Correct answer.
  3. The loosening of rib stitching
  4. The removal of paint during refinishing

Explanation

Washout describes a decrease in angle of incidence from root to tip, which helps delay tip stall and maintain aileron effectiveness. It is a designed geometric feature, not a maintenance action. Wash-in is the opposite.

Question 36Aircraft General Knowledge (Airframe, Systems, Powerplant)

Why is the fuel tank vent important during a climb?

  1. It allows fuel to drain overboard if the tank is overfilled
  2. It supplies pressurised air to the fuel pump
  3. It measures fuel quantity
  4. It prevents a vacuum from forming in the tank as fuel is consumed and altitude increases Correct answer.

Explanation

As fuel is used and the aircraft climbs, pressure inside a sealed tank would fall below ambient unless air can enter. The vent equalises pressure, preventing fuel starvation and tank collapse. A blocked vent can cause the engine to stop.

Question 37Aircraft General Knowledge (Airframe, Systems, Powerplant)

What is the function of the voltage regulator in an aircraft charging system?

  1. To convert DC to AC for the avionics
  2. To measure current flow to the starter
  3. To limit alternator or generator output voltage to a safe value Correct answer.
  4. To disconnect the battery during engine start

Explanation

The voltage regulator controls the field current of the alternator or generator so that output voltage stays within limits regardless of load and RPM. Without it, voltage could rise high enough to damage avionics and the battery. Current measurement is a separate function.

Question 38Aircraft General Knowledge (Airframe, Systems, Powerplant)

A pilot notices that the ammeter shows a discharge while the engine is running above idle and all electrical equipment is switched on. What is the most appropriate interpretation?

  1. The starter is still engaged
  2. The ammeter is indicating normal operation
  3. The battery is fully charged and no current is needed
  4. The alternator is not supplying enough current to meet the load Correct answer.

Explanation

A discharge with the engine running means the load exceeds the charging source, so the battery is supplying the deficit. This may indicate an alternator failure or an overload. The pilot should reduce electrical load and investigate.

Question 39Aircraft General Knowledge (Airframe, Systems, Powerplant)

What is the purpose of a shear pin or fuse in an aircraft control system linkage?

  1. To adjust cable tension during rigging
  2. To transmit electrical signals to the autopilot
  3. To lock the control surface in the neutral position
  4. To provide a deliberate weak point that fails before more critical structure is damaged Correct answer.

Explanation

A shear pin or fuse is designed to fail at a predetermined load, protecting the surrounding structure from overload. It acts as a mechanical safety device. After failure it must be replaced with the correct part.

Question 40Aircraft General Knowledge (Airframe, Systems, Powerplant)

In a fuel-injected engine, what is the function of the fuel/air control unit?

  1. To pressurise the fuel tank
  2. To meter fuel in proportion to airflow and control the mixture Correct answer.
  3. To filter contaminants from the fuel
  4. To cool the fuel before it reaches the injectors

Explanation

The fuel/air control unit senses airflow and meters the correct amount of fuel, with the mixture control adjusting the fuel-to-air ratio. It is the injection system's equivalent of a carburettor. Filtration and tank pressurisation are separate functions.

Question 41Aircraft General Knowledge (Airframe, Systems, Powerplant)

An engine is running with the mixture set too lean at high power. What is the most likely consequence?

  1. Detonation and high cylinder head temperatures Correct answer.
  2. Loss of magneto output
  3. Excessive oil consumption
  4. Carburettor icing

Explanation

A lean mixture burns at higher temperature and can cause detonation, especially at high power settings. Detonation raises CHT and can damage pistons and valves. The mixture should be set according to the manufacturer's procedure.

Question 42Aircraft General Knowledge (Airframe, Systems, Powerplant)

Why does a turbocharged engine require a wastegate?

  1. To enrich the mixture at high altitude
  2. To bypass exhaust gas around the turbine and limit boost pressure Correct answer.
  3. To cool the compressed air before it enters the engine
  4. To drive the oil pump at high altitude

Explanation

The wastegate controls how much exhaust gas reaches the turbine, thereby regulating boost. Without it, boost could rise beyond the engine's design limits and cause detonation or structural damage. Intercooling and mixture enrichment are separate functions.

Question 43Aircraft General Knowledge (Airframe, Systems, Powerplant)

A pilot reports that the landing gear warning horn sounds when the throttle is retarded but the gear is down and locked. Which is the most likely cause?

  1. The fuel selector is on the wrong tank
  2. A faulty gear-down limit switch or a wiring fault in the warning circuit Correct answer.
  3. The engine has lost oil pressure
  4. The alternator has failed

Explanation

The warning circuit uses throttle position and gear position switches to trigger the horn. If the horn sounds with the gear down and locked, the gear-down switch or its wiring is likely not completing the circuit that inhibits the warning. Oil pressure, alternator and fuel selection do not affect this circuit.

Question 44Aircraft General Knowledge (Airframe, Systems, Powerplant)

What is the structural significance of the wing's torsion box?

  1. It resists twisting loads and is formed by the spar or spars together with the upper and lower skin Correct answer.
  2. It provides the attachment for the wing tip fairing
  3. It houses the fuel tank only
  4. It supports the engine mount

Explanation

The torsion box is the closed structure formed by the spars and the upper and lower skins, and it carries torsional loads from the wing. This gives the wing stiffness against twisting. Fuel tanks may be housed inside it, but that is not its structural purpose.

Question 45Flight Performance and Planning

In a light twin-engine aeroplane certified under CS-23/FAR-23 performance rules, what does the accelerate-stop distance represent?

  1. The total runway length that must be available for a normal take-off without any engine failure
  2. The distance from brake release to the point where the aeroplane reaches V1 with one engine inoperative
  3. The distance needed to accelerate to V2 and clear a 15 m obstacle after engine failure
  4. The distance required to accelerate to V1, lose the critical engine, and then bring the aeroplane to a full stop Correct answer.

Explanation

Accelerate-stop distance is the runway length needed to accelerate to the decision speed V1, experience the failure of the critical engine at that moment, and then abort the take-off and stop on the remaining braking and reverse thrust. It is a balanced-field concept that pairs with the accelerate-go distance to define the required runway length.

Question 46Flight Performance and Planning

On a take-off performance chart, increasing the outside air temperature while pressure altitude and mass are held constant will typically produce which change?

  1. No change to take-off distance because mass is unchanged
  2. A longer take-off ground roll and a reduced climb gradient Correct answer.
  3. A lower V1 but an unchanged take-off distance
  4. A shorter take-off ground roll and a steeper initial climb gradient

Explanation

Higher temperature reduces air density, which lowers thrust output from the engines and reduces lift for a given true airspeed. The result is a longer ground roll to reach the required speed and a shallower climb gradient after lift-off. This is why hot-and-high conditions are the most limiting for take-off performance.

Question 47Flight Performance and Planning

Which statement best describes the effect of headwind on the take-off ground roll of a given aeroplane at a fixed mass?

  1. Headwind has no effect on ground roll because performance is measured in air distance
  2. Headwind reduces the ground roll because the aeroplane reaches the required airspeed at a lower groundspeed Correct answer.
  3. Headwind shortens the airborne segment but lengthens the ground roll
  4. Headwind increases the ground roll because more thrust is required to overcome it

Explanation

Take-off performance depends on airspeed, but distance along the runway is covered at groundspeed. A headwind means the required airspeed is achieved at a lower groundspeed, so less runway is used during the ground roll. The airborne distance is largely unaffected because it is measured relative to the air mass.

Question 48Flight Performance and Planning

What is the primary purpose of computing a balanced field length for a twin-engine take-off?

  1. To ensure the aeroplane can climb at V2 with both engines operating
  2. To determine the maximum crosswind component for the departure runway
  3. To find the V1 at which the accelerate-stop distance equals the accelerate-go distance Correct answer.
  4. To calculate the fuel required to reach the alternate aerodrome

Explanation

Balanced field length is achieved at the V1 where the distance to accelerate and stop equals the distance to accelerate, lose an engine, and continue to 35 ft. This V1 minimises the runway length required to satisfy both the abort and continue cases. Operators use it to confirm the runway is adequate for the planned mass and conditions.

Question 49Flight Performance and Planning

An aeroplane has a landing mass of 55 000 kg and a landing reference speed of 140 kt. If landing distance varies approximately with the square of the reference speed, what happens to the landing distance if the reference speed increases to 154 kt at the same mass and conditions?

  1. It increases by about 21 % Correct answer.
  2. It increases by about 40 %
  3. It remains unchanged because mass is constant
  4. It increases by about 10 %

Explanation

Landing distance scales with the square of the reference speed, so the ratio is (154/140)² = 1.10² ≈ 1.21. That corresponds to roughly a 21 % increase in landing distance. This square relationship explains why small speed increases have a disproportionately large effect on required runway.

Question 50Flight Performance and Planning

When planning a flight under instrument flight rules, which fuel figure must be included in addition to trip fuel and contingency fuel?

  1. Alternate fuel, final reserve fuel and, where required, additional fuel Correct answer.
  2. Taxi fuel only, with no further reserve
  3. Only the fuel needed to reach the destination
  4. Contingency fuel alone, since reserves are included in trip fuel

Explanation

IFR fuel planning requires trip fuel, contingency fuel, alternate fuel where an alternate is required, final reserve fuel, and additional fuel for any specific operational need such as a remote destination. Taxi fuel is also accounted for separately. Each element must be identifiable so that the commander can verify reserves on arrival.