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KCAA CPL Theory practice questions

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Question 1Air Law and ATC Procedures

Under the ICAO Convention on International Civil Aviation (Chicago Convention), which document is issued by a State to certify that an aircraft is fit for flight and complies with applicable airworthiness requirements?

  1. Certificate of Registration
  2. Certificate of Airworthiness Correct answer.
  3. Crew Licence
  4. Air Operator Certificate

Explanation

The Certificate of Airworthiness is the document confirming that an individual aircraft meets the airworthiness requirements of the State of Registry and is fit for flight. Registration is a separate nationality record, while an Air Operator Certificate authorises the operator and a crew licence certifies an individual.

Question 2Air Law and ATC Procedures

An aircraft is being operated on an international flight and the pilot-in-command becomes incapacitated. Which crew member may assume command of the aircraft?

  1. The most senior cabin crew member
  2. The operator's duty dispatcher
  3. The co-pilot designated as second-in-command Correct answer.
  4. The flight engineer

Explanation

When the pilot-in-command is incapacitated, command passes to the second-in-command, normally the co-pilot, who is licensed and qualified for the role. Cabin crew, flight engineers and ground dispatchers do not hold pilot licences and cannot assume command.

Question 3Air Law and ATC Procedures

In the standard ICAO phonetic alphabet, how is the letter 'Q' spoken?

  1. Quiet
  2. Quill
  3. Queen
  4. Quebec Correct answer.

Explanation

ICAO assigns the word 'Quebec' to the letter Q to ensure unambiguous radio communication. The other options are not part of the standard phonetic alphabet and could cause confusion.

Question 4Air Law and ATC Procedures

On a standard aeronautical chart, what does a solid red line marking the boundary of controlled airspace typically indicate?

  1. The limit of the State's flight information region
  2. The boundary of a prohibited area
  3. The lateral limit of controlled airspace Correct answer.
  4. The edge of the aerodrome traffic zone

Explanation

Controlled airspace lateral limits are depicted by specific boundary lines, and the legend of the chart confirms the exact convention used. Prohibited areas and FIR boundaries are shown with different symbology, so the chart legend must always be consulted.

Question 5Air Law and ATC Procedures

What is the primary purpose of a clearance delivery position at a controlled aerodrome?

  1. To sequence arriving aircraft on final approach
  2. To issue IFR and VFR clearances before flight Correct answer.
  3. To control aircraft on the manoeuvring area
  4. To provide radar vectoring after departure

Explanation

Clearance delivery issues route and departure clearances to pilots before they taxi, reducing workload on ground and tower positions. Radar vectoring, surface movement control and approach sequencing are handled by other ATC positions.

Question 6Air Law and ATC Procedures

Which of the following best describes the function of an Aerodrome Flight Information Service (AFIS)?

  1. It provides radar separation on final approach
  2. It issues clearances and separates IFR traffic
  3. It authorises take-off and landing
  4. It provides information to pilots but does not issue clearances Correct answer.

Explanation

AFIS provides information to aircraft on or near an aerodrome but does not issue clearances or provide separation; pilots remain responsible for their own separation. Clearance issuing and separation are functions of air traffic control, not AFIS.

Question 7Air Law and ATC Procedures

An aircraft is on an IFR flight in Class C airspace. Which statement correctly describes the separation provided?

  1. IFR flights are separated from IFR flights but not from VFR flights
  2. No separation is provided to IFR flights in Class C
  3. IFR flights are separated from all other IFR flights and from VFR flights Correct answer.
  4. Separation is provided only against known VFR flights

Explanation

In Class C airspace, IFR flights are separated from other IFR flights and from VFR flights, while VFR flights are separated from IFR flights but receive traffic information about other VFR flights. This is a defining characteristic of Class C.

Question 8Air Law and ATC Procedures

An aircraft's transponder is set to code 7600. What does this indicate to ATC?

  1. Loss of navigation capability
  2. Radio communication failure Correct answer.
  3. Medical emergency
  4. Unlawful interference

Explanation

Code 7600 is the standard SSR code for radio communication failure. Code 7700 is the general emergency code and 7500 indicates unlawful interference, so the correct interpretation is communication failure.

Question 9Air Law and ATC Procedures

When must a pilot reading back an ATC clearance include the word 'roger'?

  1. When requesting a repetition of a clearance
  2. When accepting a clearance that requires no readback Correct answer.
  3. When confirming a frequency change
  4. When acknowledging a request for a position report

Explanation

'Roger' means the message has been received and understood, and it is used when no readback is required. Clearances that contain instructions such as route, altitude or frequency normally require a full readback rather than 'roger'.

Question 10Air Law and ATC Procedures

An aircraft on approach experiences a TCAS resolution advisory instructing 'CLIMB'. What is the correct pilot action?

  1. Continue the approach and advise ATC of the RA
  2. Disconnect the autopilot and maintain the current flight path
  3. Descend to the cleared altitude and then report the RA
  4. Follow the RA immediately, even if it conflicts with the ATC clearance Correct answer.

Explanation

A TCAS resolution advisory must be followed immediately, and the pilot should then notify ATC of the deviation. Maintaining the ATC clearance or the current flight path defeats the purpose of the advisory.

Question 11Air Law and ATC Procedures

What is the purpose of a standard instrument departure (SID) procedure?

  1. To define the holding pattern at the destination
  2. To prescribe the approach minima for each runway
  3. To sequence arrivals at the terminal area
  4. To provide a published route from the runway to the en-route phase Correct answer.

Explanation

A SID is a published ATC departure procedure linking the runway environment to the en-route structure, often with obstacle clearance and noise abatement considerations. Holding, approach minima and arrival sequencing are separate procedures.

Question 12Air Law and ATC Procedures

An aircraft is cleared to enter a control zone. What does this clearance imply regarding the pilot's responsibility for terrain clearance?

  1. Terrain clearance is provided only for IFR flights
  2. The pilot remains responsible for terrain clearance unless explicitly relieved Correct answer.
  3. The clearance automatically provides MSA protection
  4. ATC guarantees terrain clearance for all cleared flights

Explanation

An ATC clearance does not relieve the pilot-in-command of responsibility for terrain clearance unless the clearance explicitly states otherwise. Pilots must ensure the aircraft remains clear of terrain and obstacles.

Question 13Air Law and ATC Procedures

What is the standard separation minimum between two IFR aircraft in radar-controlled airspace at the same level?

  1. 10 NM horizontally or 2000 ft vertically
  2. 5 NM horizontally or 1000 ft vertically Correct answer.
  3. 3 NM horizontally or 500 ft vertically
  4. 1 NM horizontally or 1000 ft vertically

Explanation

Standard radar separation in controlled airspace is generally 5 NM laterally or 1000 ft vertically, unless reduced minima are specifically approved. The other options do not reflect standard ICAO separation values.

Question 14Air Law and ATC Procedures

An aircraft is instructed to 'hold short of runway 27 at holding point A'. What does this instruction require the pilot to do?

  1. Taxi onto the runway and await take-off clearance
  2. Enter the runway and line up
  3. Stop at holding point A and remain clear of the runway Correct answer.
  4. Continue taxiing across the runway

Explanation

'Hold short' requires the aircraft to stop at the specified holding point and remain clear of the runway until further clearance. It does not authorise entry onto the runway or lining up.

Question 15Air Law and ATC Procedures

Under ICAO rules, what does the abbreviation 'MSA' represent on an instrument approach chart?

  1. Minimum Sector Altitude Correct answer.
  2. Minimum Safe Altitude
  3. Maximum Safe Altitude
  4. Mandatory Separation Altitude

Explanation

MSA stands for Minimum Sector Altitude, which provides obstacle clearance within a defined sector around a navigation aid. It is not a maximum altitude or a separation minimum.

Question 16Air Law and ATC Procedures

An aircraft is flying VFR in Class D airspace. Which condition must be satisfied before entering?

  1. The pilot must file a flight plan
  2. The aircraft must be IFR equipped
  3. No clearance is required but radio contact must be established
  4. An ATC clearance must be obtained Correct answer.

Explanation

In Class D airspace, VFR flights require an ATC clearance before entry, and radio communication must be established. Radio contact alone is insufficient; the clearance itself is mandatory.

Question 17Air Law and ATC Procedures

What is the primary purpose of a NOTAM?

  1. To record aircraft maintenance actions
  2. To issue airworthiness directives
  3. To publish permanent changes to the AIP
  4. To notify pilots of temporary changes to aeronautical information Correct answer.

Explanation

A NOTAM distributes time-critical information about temporary changes or hazards affecting flight operations. Permanent changes are published in the AIP, and maintenance or airworthiness matters are handled through other documents.

Question 18Air Law and ATC Procedures

An aircraft is instructed by ATC to descend to 3000 ft with the phrase 'descend to 3000 ft, report leaving 5000 ft'. What is the correct readback?

  1. Descend to 5000 ft, report leaving 3000 ft
  2. Descend to 3000 ft, roger
  3. Descend to 3000 ft, wilco
  4. Descend to 3000 ft, report leaving 5000 ft Correct answer.

Explanation

The full clearance, including the level to which the aircraft is cleared and the report instruction, must be read back. 'Wilco' and 'roger' do not confirm the altitude values and are insufficient for this clearance.

Question 19Air Law and ATC Procedures

An aircraft is on an IFR flight and the pilot reports a loss of radio communication. What is the standard action regarding the transponder?

  1. Set code 2000 and continue visually
  2. Set code 7500 and hold at the last position
  3. Set code 7600 and continue according to the last acknowledged clearance Correct answer.
  4. Set code 7700 and descend immediately

Explanation

Loss of communication is signalled with code 7600, and the pilot should continue in accordance with the last acknowledged clearance or the applicable lost communication procedure. Code 7700 is for emergencies and 7500 for unlawful interference.

Question 20Air Law and ATC Procedures

Two aircraft are approaching the same level in controlled airspace. ATC issues a traffic advisory and instructs one aircraft to maintain its level while the other climbs. Which principle underlies this instruction?

  1. Pilots are responsible for separation in all controlled airspace
  2. Traffic advisories alone provide separation
  3. Positive separation must be maintained by assigning different levels or lateral/vertical separation Correct answer.
  4. Separation is only required above FL100

Explanation

ATC must ensure positive separation between IFR flights by assigning different levels or lateral separation; a traffic advisory does not itself provide separation. In controlled airspace, separation responsibility rests with ATC, not solely with the pilots.

Question 21Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

In a semi-monocoque aircraft fuselage, what is the primary function of the longitudinal stringers?

  1. They resist all torsional loads without any contribution from the skin
  2. They provide the mounting points for the engine bearers only
  3. They form the pressure bulkheads at the nose and tail
  4. They carry the bending loads together with the skin and stiffen it against buckling Correct answer.

Explanation

A semi-monocoque structure relies on the skin to carry much of the load, and the stringers stiffen the skin and share longitudinal bending stresses. The frames maintain the shape and limit skin buckling between stringers. Neither stringers nor frames alone resist torsion, which requires a closed skin.

Question 22Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What is the main purpose of a wing spar in a conventional light aircraft?

  1. To attach the ailerons to the wing
  2. To store fuel in all wing types
  3. To provide the aerofoil shape and smooth airflow over the wing
  4. To act as the primary spanwise load-carrying member of the wing Correct answer.

Explanation

The spar is the main structural beam of the wing, carrying bending and shear loads from the wing surface to the fuselage. The skin and ribs give the wing its aerodynamic shape. Fuel may be stored in some spars or integral tanks, but that is not the spar's structural purpose.

Question 23Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

A cable-operated flying control system uses turnbuckles in the control runs. What is the purpose of a turnbuckle?

  1. To lock the cable ends against the pulley
  2. To adjust and maintain the correct cable tension Correct answer.
  3. To increase the mechanical advantage of the control horn
  4. To prevent the cable from rubbing on the fairlead

Explanation

A turnbuckle is a threaded barrel with opposite-hand threads at each end, so rotating it shortens or lengthens the run and sets the cable tension. It must be safety-wired or locked after adjustment. Pulleys and fairleads guide the cable and are separate components.

Question 24Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What is the effect on the indicated airspeed if the static pressure source becomes blocked while the aircraft climbs?

  1. The indicated airspeed will read zero
  2. The indicated airspeed will under-read
  3. The indicated airspeed will remain accurate
  4. The indicated airspeed will over-read Correct answer.

Explanation

If static pressure is trapped at the lower value, the pitot-static system senses a larger pressure difference between pitot and static than actually exists. The airspeed indicator therefore over-reads as the aircraft climbs. The altimeter and vertical speed indicator would also be affected.

Question 25Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

An aircraft hydraulic system uses a pressure relief valve. What is its function?

  1. To filter contaminants from the hydraulic fluid
  2. To prevent reverse flow through the pump
  3. To limit the maximum system pressure by returning fluid to the reservoir Correct answer.
  4. To maintain a constant pressure in the system at all times

Explanation

The relief valve opens when system pressure exceeds a set value and bypasses fluid back to the reservoir, protecting components from overpressure. It is a safety device and does not regulate normal operating pressure; that is the job of the pressure regulator or unloading valve.

Question 26Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

In a simple aircraft hydraulic system, what is the purpose of the accumulator?

  1. To increase the flow rate of the engine-driven pump
  2. To act as the main reservoir for the system
  3. To cool the hydraulic fluid during operation
  4. To store hydraulic energy and damp pressure surges Correct answer.

Explanation

An accumulator contains a trapped gas charge that is compressed as fluid enters, storing energy. It supplies fluid for short high-demand periods, damps pressure pulses and maintains pressure when the pump is unloaded. It is not the main fluid reservoir.

Question 27Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What is the purpose of a shuttle valve in a hydraulic system with two independent pressure sources?

  1. To shut off both sources if either fails
  2. To equalize the pressure in both sources continuously
  3. To alternate the supply between the two sources at a fixed rate
  4. To allow either source to supply a component while isolating the other Correct answer.

Explanation

A shuttle valve has two inlets and one outlet; the higher pressure moves the shuttle to seal the other inlet. This lets either system operate the component while preventing fluid from the failed or lower-pressure system from escaping. It does not alternate or equalize the sources.

Question 28Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

Why is a hydraulic system usually fitted with a pressure regulator or unloading valve in addition to a relief valve?

  1. To replace the relief valve entirely
  2. To prevent the fluid from freezing
  3. To unload the pump at high pressure and reduce heat and power consumption Correct answer.
  4. To increase the maximum system pressure

Explanation

The unloading valve diverts pump output back to the reservoir once the accumulator is charged, so the pump runs unloaded and generates less heat and uses less engine power. The relief valve remains as a backup safety device. The regulator does not raise the system pressure.

Question 29Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

On a light aircraft electrical system, what is the function of the voltage regulator?

  1. To limit the current drawn by the starter motor
  2. To protect the battery from overcharging by opening the master switch
  3. To keep the generator or alternator output voltage within limits Correct answer.
  4. To convert AC to DC for the battery

Explanation

The voltage regulator controls the field current of the generator or alternator so that output voltage stays within the design range as load and engine speed vary. Rectification of AC to DC is done by diodes in the alternator. The master switch is operated by the pilot.

Question 30Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

An aircraft alternator warning lamp illuminates in flight with the ammeter showing a discharge. What is the most likely cause?

  1. The voltage regulator is reducing output because the load is low
  2. The alternator has failed and the battery is supplying the electrical load Correct answer.
  3. The battery is fully charged and the system is normal
  4. The starter relay has remained engaged

Explanation

A discharge indication with the warning lamp on means the alternator is not producing sufficient output, so the battery is carrying the load and will gradually run down. The pilot should reduce electrical load and land as soon as practicable. A fully charged battery would not cause a discharge with the alternator online.

Question 31Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

Why is a circuit breaker preferred to a fuse in many aircraft electrical circuits?

  1. It eliminates the need for a master switch
  2. It can be reset in flight after the fault is corrected Correct answer.
  3. It converts alternating current to direct current
  4. It provides a higher current rating than any fuse

Explanation

A circuit breaker is a resettable protective device, so a transient fault can be cleared and the circuit restored without replacing a component. A fuse must be replaced once it has blown. Neither device rectifies current or replaces the master switch.

Question 32Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What is the purpose of the magneto in a reciprocating aircraft engine?

  1. To supply current to the fuel pump
  2. To provide the low-tension current for the starter motor
  3. To advance the ignition timing as altitude increases
  4. To generate the high-tension voltage for the spark plugs independently of the battery Correct answer.

Explanation

A magneto is a self-contained generator that produces high voltage for the spark plugs, so the ignition system does not depend on the aircraft battery. This is why a dual magneto system continues to run even with a failed electrical system. It does not supply the starter or fuel pump.

Question 33Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

During a magneto check, the engine runs rough when switched to the left magneto and smooth on the right. What is the most likely explanation?

  1. A fault in the right magneto or its associated spark plugs
  2. A fault in the left magneto or its associated spark plugs Correct answer.
  3. Normal operation, since one magneto is always weaker
  4. A blocked fuel injector on all cylinders

Explanation

When the left magneto is selected, the engine runs on the left magneto alone; roughness indicates that the left magneto or its plugs are faulty. The right magneto is proven serviceable because the engine ran smoothly on it. A drop within limits on both positions is normal, but roughness is not.

Question 34Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What is the function of the carburettor heat system in a reciprocating engine?

  1. To prevent or clear ice formation in the carburettor venturi and throttle area Correct answer.
  2. To cool the engine oil during descent
  3. To warm the fuel before it enters the cylinders for better combustion
  4. To heat the cabin air supply

Explanation

Carburettor icing occurs when fuel vaporization and pressure drop cool the mixture below freezing, and carburettor heat supplies warm air to the venturi to melt or prevent that ice. Applying carburettor heat typically causes a small rpm drop because the heated air is less dense. The system is not a cabin heat or oil cooling device.

Question 35Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What happens to the mixture strength if carburettor heat is applied during cruise?

  1. The mixture becomes richer because the heated air is less dense Correct answer.
  2. The mixture becomes richer because the fuel becomes warmer
  3. The mixture strength is unaffected
  4. The mixture becomes leaner because the fuel flow increases

Explanation

Heated induction air has a lower density, so each intake stroke draws in less mass of air while the fuel metering is largely unchanged, making the mixture richer. This is why the mixture may need leaning after carburettor heat is applied. The effect is due to air density, not to fuel temperature.

Question 36Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

In a constant-speed propeller system, what is the function of the governor?

  1. To synchronize the propeller with the engine firing order
  2. To limit the maximum manifold pressure
  3. To control propeller blade angle so that engine rpm remains at the selected value Correct answer.
  4. To feather the propeller automatically on every power reduction

Explanation

The propeller governor senses engine rpm and adjusts oil pressure to the propeller hub to change blade angle, keeping rpm at the value set by the pilot. If rpm tends to rise, the governor increases blade angle to add load. It does not control manifold pressure or feather automatically.

Question 37Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What is the purpose of feathering a propeller on a multi-engine aircraft?

  1. To reduce drag from a failed engine by aligning the blades with the relative airflow Correct answer.
  2. To increase thrust from the operating engine
  3. To cool the failed engine more quickly
  4. To reduce the engine oil pressure

Explanation

A windmilling propeller produces significant drag, so feathering turns the blades edge-on to the airflow to minimize that drag and reduce asymmetric control problems. It also stops the engine rotating and protects it. It does not increase thrust from the other engine.

Question 38Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What is the main advantage of a turbocharger over a normal aspirated engine at high altitude?

  1. It maintains manifold pressure by compressing the thin ambient air Correct answer.
  2. It cools the intake charge without any intercooler
  3. It reduces the engine's fuel consumption at sea level
  4. It eliminates the need for a mixture control

Explanation

A turbocharger uses exhaust gas energy to drive a compressor that raises the intake air pressure, restoring manifold pressure as altitude increases and the ambient air thins. This allows the engine to maintain power at higher altitudes. It does not remove the need for mixture control.

Question 39Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What is the purpose of an intercooler in a turbocharged engine installation?

  1. To cool the compressed intake charge and increase its density Correct answer.
  2. To cool the engine oil after the turbocharger
  3. To reduce the exhaust gas temperature before the turbine
  4. To cool the cabin air supply

Explanation

Compressing air raises its temperature, which reduces density and increases the risk of detonation. An intercooler removes some of that heat so the charge entering the cylinders is denser and safer. It acts on the intake charge, not on the oil or exhaust.

Question 40Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

In a gas turbine engine, what is the function of the compressor?

  1. To cool the combustion gases before they reach the turbine
  2. To drive the propeller directly
  3. To ignite the fuel-air mixture
  4. To raise the pressure of the air before it enters the combustion chamber Correct answer.

Explanation

The compressor takes in air and raises its pressure, delivering high-pressure air to the combustion chamber where fuel is added and burned. The expanding gases then drive the turbine, which in turn drives the compressor. Ignition is provided by igniter plugs.

Question 41Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What happens to the thrust of a jet engine if the turbine is damaged and its efficiency falls?

  1. Thrust decreases because less energy is available to drive the compressor Correct answer.
  2. Thrust increases because the compressor speed rises
  3. Thrust increases because more energy remains in the exhaust
  4. Thrust is unaffected because the compressor is independent

Explanation

The turbine extracts energy from the gas stream to drive the compressor. If turbine efficiency falls, less energy is available to drive the compressor, so the engine cannot sustain its normal pressure ratio and thrust falls. The exhaust energy does not increase as a result.

Question 42Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What is the purpose of a fire detection system in an aircraft engine compartment?

  1. To cool the engine compartment after a fire
  2. To prevent fuel from reaching the engine in the event of a fire
  3. To warn the crew of a fire so that the appropriate extinguishing procedure can be started Correct answer.
  4. To automatically extinguish any fire without crew action

Explanation

Fire detection systems use sensing elements to detect a fire and provide a warning in the cockpit, allowing the crew to shut down the engine and discharge the extinguisher. Extinguishing is normally a crew action, although some systems may be automatic. Detection itself does not shut off fuel or cool the compartment.

Question 43Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

A fire warning sounds immediately after engine start and then stops by itself. What is the most appropriate initial action?

  1. Ignore it because the warning has cleared
  2. Treat the warning as real, shut down the engine and investigate before further flight Correct answer.
  3. Reset the fire detection circuit breaker and continue
  4. Continue the flight and monitor the warning periodically

Explanation

A fire warning must never be dismissed simply because it clears; a real fire may have been extinguished by the shutdown or the detector may be faulty. The safe course is to shut down the engine and have the system and engine inspected before flight. Resetting a breaker or continuing flight is not acceptable.

Question 44Aircraft General Knowledge - Airframe, Systems, Electrics, Powerplant and Emergency Equipment

What is the purpose of the engine fire extinguisher discharge into the engine compartment?

  1. To increase the fuel flow to clear the fire
  2. To cool the engine so that it can be restarted quickly
  3. To displace oxygen and interrupt the combustion process Correct answer.
  4. To lubricate the engine components after shutdown

Explanation

Fire extinguishing agents such as halon or inert gas smother the fire by displacing oxygen or chemically interrupting the combustion reaction. The engine should already be shut down and the fuel and ignition isolated. The agent does not cool the engine for restart or lubricate components.

Question 45Flight Performance and Planning

In the KCAA CPL mass and balance syllabus, which term describes the maximum mass at which an aircraft may commence its take-off run, including all loads and fuel on board?

  1. Basic operating mass
  2. Maximum take-off mass Correct answer.
  3. Maximum landing mass
  4. Maximum zero-fuel mass

Explanation

Maximum take-off mass is the certified structural and performance limit for the aircraft at the start of the take-off run with everything on board. Maximum landing mass applies at touchdown, and maximum zero-fuel mass excludes usable fuel, so neither defines the start of the take-off run.

Question 46Flight Performance and Planning

An aircraft has a basic empty mass of 1 600 kg with a moment of 4 800 kg·m. Adding a 200 kg pilot at a station 1.5 m from the datum gives a new total moment of:

  1. 4 800 kg·m
  2. 5 300 kg·m
  3. 5 000 kg·m
  4. 5 100 kg·m Correct answer.

Explanation

The added moment is 200 kg multiplied by 1.5 m, which equals 300 kg·m. Adding this to the existing 4 800 kg·m gives a total moment of 5 100 kg·m.

Question 47Flight Performance and Planning

During a climb at a constant indicated airspeed, why does the true airspeed increase as altitude increases?

  1. Air density increases, so the wing produces more lift at the same angle of attack
  2. The angle of attack must increase to hold the same indicated speed
  3. Air density decreases, so a given dynamic pressure corresponds to a higher true speed Correct answer.
  4. Engine power increases with altitude, accelerating the aircraft

Explanation

Indicated airspeed reflects dynamic pressure, which depends on density and true speed squared. As density falls with altitude, the same dynamic pressure requires a higher true airspeed. Engine power normally decreases with altitude, so that reasoning is reversed.

Question 48Flight Performance and Planning

Which factor causes the take-off ground roll to increase?

  1. A lower outside air temperature
  2. A headwind component
  3. A tailwind component Correct answer.
  4. A lower airfield pressure altitude

Explanation

A tailwind reduces the airspeed achieved for a given groundspeed during the ground roll, so the aircraft must accelerate over more ground to reach flying speed. Headwind, low altitude and low temperature all shorten the ground roll.

Question 49Flight Performance and Planning

On a take-off performance chart, the term 'screen height' at the end of the take-off distance available refers to the height of the aircraft above the runway surface, which for a commercial transport take-off is normally:

  1. 15 ft
  2. 50 ft
  3. 35 ft Correct answer.
  4. 10 ft

Explanation

The take-off distance required is measured to a screen height of 35 ft for large commercial transport aeroplanes. Fifteen feet is associated with the landing screen height for such aircraft, and 50 ft is the obstacle clearance screen height used in some other contexts.

Question 50Flight Performance and Planning

An aircraft is loaded such that its centre of gravity is at the forward limit. Compared with the mid-range position, the effect is that:

  1. The stall speed decreases and the aircraft becomes more manoeuvrable
  2. The elevator effectiveness required to rotate and flare is increased and cruise fuel consumption may rise Correct answer.
  3. The longitudinal stability is reduced and the aircraft may be more difficult to trim
  4. The take-off run shortens because the nose lifts earlier

Explanation

A forward centre of gravity increases the nose-down moment, so more elevator deflection and a longer rotation and flare are needed. The extra download on the tailplane also increases trim drag, raising fuel consumption.