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BDCA CPL Knowledge Exam practice questions

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Question 1Air Law

Under the Convention on International Civil Aviation (Chicago Convention), which body is the permanent governing organ of ICAO responsible to the Assembly?

  1. The Secretariat
  2. The Air Navigation Commission
  3. The Legal Committee
  4. The Council Correct answer.

Explanation

The Chicago Convention establishes the Council as the permanent governing body of ICAO, elected by and responsible to the Assembly. The Air Navigation Commission, the Secretariat and the Legal Committee are subordinate bodies that assist the Council and the Assembly but do not govern the organisation.

Question 2Air Law

Annex 2 to the Chicago Convention deals with which subject?

  1. Operation of Aircraft
  2. Aircraft Nationality and Registration Marks
  3. Rules of the Air Correct answer.
  4. Personnel Licensing

Explanation

Each ICAO Annex covers a defined subject area, and Annex 2 contains the Rules of the Air applicable to all aircraft. It sets out matters such as right of way, minimum heights and flight rules. Personnel Licensing is Annex 1 and Operation of Aircraft is Annex 6.

Question 3Air Law

In the event of a conflict between an ICAO Standard and a national regulation of a contracting State, what is the legal position?

  1. The conflict must be resolved by the ICAO Council before flight
  2. The State's own regulation prevails, provided the State has notified a difference to ICAO Correct answer.
  3. The ICAO Standard automatically overrides the national regulation
  4. The aircraft commander decides which rule applies in flight

Explanation

ICAO Standards are not self-executing; States must incorporate them into national law and notify any differences to ICAO. Where a notified difference exists, the national regulation governs operations within that State. The Council does not adjudicate individual conflicts, and the commander cannot choose which rule applies.

Question 4Air Law

What is the principal purpose of a Standards and Recommended Practices document in the form of an ICAO Annex?

  1. To replace national aviation legislation entirely
  2. To set the price of air navigation services
  3. To regulate military air operations in peacetime
  4. To harmonise international civil aviation practice for safety and regularity Correct answer.

Explanation

ICAO Annexes exist to achieve uniformity in aviation practice so that international operations are safe, regular and efficient. Standards are mandatory requirements while Recommended Practices are desirable. They do not set prices, do not automatically replace national law, and do not govern military operations.

Question 5Air Law

Under the Convention on International Civil Aviation, aircraft engaged in international navigation have the right to make certain non-traffic stops in the territory of other contracting States. This right applies to stops made for which purpose?

  1. Discharging cargo destined for that State
  2. Embarking mail for another State
  3. Non-traffic purposes such as refuelling or maintenance Correct answer.
  4. Taking on passengers for reward

Explanation

Article 5 of the Chicago Convention permits aircraft of contracting States to make flights into or across the territory of other States and to make stops for non-traffic purposes. Such stops include refuelling and maintenance but exclude embarking or disembarking passengers, cargo or mail for commercial purposes. Commercial traffic rights require separate authorisation.

Question 6Air Law

Which document is normally issued by a State to certify that an aircraft type design meets the applicable airworthiness requirements?

  1. Type certificate Correct answer.
  2. Certificate of airworthiness
  3. Noise certificate
  4. Certificate of registration

Explanation

A type certificate is issued for the design of an aircraft type and confirms compliance with the applicable airworthiness code. A certificate of airworthiness is issued for an individual aircraft, while registration identifies ownership and nationality. The noise certificate addresses noise standards only.

Question 7Air Law

An aircraft is registered in State A and operated by an airline of State A on a flight from State A to State B. Which State is responsible for enforcing the Rules of the Air over the high seas portion of the route?

  1. State B, the State of destination
  2. ICAO directly through the Council
  3. The State providing the air traffic service unit
  4. State A, the State of registry Correct answer.

Explanation

Over the high seas, the Rules of the Air of Annex 2 apply without exception, and the State of registry is responsible for ensuring that aircraft on its register comply. The destination State and the ATS provider do not acquire that enforcement responsibility. ICAO does not enforce rules on individual flights.

Question 8Air Law

What is the primary purpose of the Convention on the Suppression of Unlawful Acts (Montreal Convention 1971) in civil aviation law?

  1. To establish offences and jurisdiction for unlawful acts against civil aviation Correct answer.
  2. To allocate airport slots between airlines
  3. To standardise aircraft maintenance procedures
  4. To regulate the carriage of dangerous goods

Explanation

The Montreal Convention of 1971 creates criminal offences for acts such as unlawful seizure and sabotage against civil aviation and obliges States to establish jurisdiction and prosecute or extradite offenders. It does not address maintenance, slots or dangerous goods, which are covered by other instruments and Annexes.

Question 9Air Law

Under the Tokyo Convention 1963, which State is normally competent to exercise jurisdiction over offences committed on board an aircraft in flight?

  1. The State of registration of the aircraft Correct answer.
  2. The State of destination of the flight
  3. The State of departure of the flight
  4. The State overflown at the time

Explanation

The Tokyo Convention gives primary jurisdiction to the State of registration of the aircraft for offences and acts committed on board while in flight. Other States may exercise jurisdiction in defined circumstances, but registration is the principal basis. Departure, destination and overflown States do not hold primary jurisdiction by virtue of those facts alone.

Question 10Air Law

A pilot holds a licence issued by State A and wishes to fly an aircraft registered in State B. Under the licensing principles of Annex 1, what is normally required?

  1. The pilot may fly without validation because licences are internationally valid
  2. The licence must be rendered valid by State B for the aircraft on its register Correct answer.
  3. The pilot must obtain an ICAO-issued international licence
  4. The pilot must hold a licence from every State overflown

Explanation

Licences are issued by States, and Annex 1 requires a licence to be rendered valid by the State of registry for aircraft on its register. There is no automatic worldwide validity and no ICAO-issued licence. Validation by every overflown State is not required.

Question 11Air Law

What is the function of a Certificate of Registration for an aircraft?

  1. It authorises the carriage of passengers for reward
  2. It records the nationality and registration marks and the registered owner Correct answer.
  3. It confirms that the crew are properly licensed
  4. It certifies that the aircraft is airworthy

Explanation

The certificate of registration evidences the aircraft's nationality and its registration marks, and identifies the registered owner. Airworthiness is certified separately by a certificate of airworthiness. It does not confer operating authority or certify crew competence.

Question 12Air Law

An aircraft registered in State A is chartered to an operator in State B for an extended period. Under Article 83 bis of the Chicago Convention, what may the States agree to transfer?

  1. The right to issue Type Certificates to State B
  2. Ownership of the aircraft to State B
  3. The aircraft's nationality and registration marks to State B
  4. Certain functions and duties relating to the aircraft, such as airworthiness and licensing oversight Correct answer.

Explanation

Article 83 bis allows the State of registry and the State of the operator to transfer certain functions and duties, notably over airworthiness, licensing and operations, to the State of the operator. It does not transfer ownership, change nationality marks, or transfer type certificate authority.

Question 13Air Law

Which ICAO Annex addresses the safe transport of dangerous goods by air?

  1. Annex 8
  2. Annex 11
  3. Annex 18 Correct answer.
  4. Annex 14

Explanation

Annex 18, The Safe Transport of Dangerous Goods by Air, sets the international standards for the carriage of dangerous goods, supported by the associated Technical Instructions. Annex 8 covers airworthiness of aircraft, Annex 11 covers air traffic services and Annex 14 covers aerodromes.

Question 14Air Law

A commander on an international flight believes a passenger has committed a serious offence on board and intends to offload the passenger at the next landing. Under the Tokyo Convention, to which authority should the commander normally report the facts?

  1. The authorities of the State in which the aircraft lands Correct answer.
  2. The ICAO Regional Office for the area
  3. The authorities of the State of registration only
  4. The authorities of the State of the operator only

Explanation

The Tokyo Convention allows the commander to disembark a person who has committed or is about to commit an offence and requires the facts to be reported to the authorities of the State in which the aircraft lands. Reporting is not limited to the State of registration or operator. ICAO regional offices do not receive such reports.

Question 15Air Law

What does the term 'freedom of the air' known as the first freedom permit?

  1. The right to fly over the territory of another State without landing Correct answer.
  2. The right to carry traffic between two foreign States
  3. The right to carry domestic traffic within another State
  4. The right to land in another State and take on passengers

Explanation

The first freedom is the right of an airline of one State to overfly the territory of another State without landing. The second freedom permits a technical stop, while the third and fourth freedoms concern setting down and taking on traffic. Cabotage, the carriage of domestic traffic within another State, is a separate concept.

Question 16Air Law

Under the Chicago Convention, each contracting State undertakes to keep its own regulations in these matters uniform to the greatest possible degree with those established under the Convention. Which matters are referred to?

  1. Rules, standards, practices and procedures relating to aircraft, personnel, airways and auxiliary services Correct answer.
  2. Only the collection of air navigation charges
  3. Only the licensing of ground handling staff
  4. Only the registration of aircraft and mortgage recording

Explanation

Article 37 of the Convention requires States to collaborate to secure the highest practicable degree of uniformity in regulations, standards, practices and procedures relating to aircraft, personnel, airways and auxiliary services. This is the legal basis for the ICAO Annexes. It is not limited to registration, ground staff or charges.

Question 17Air Law

Which of the following is the definition of 'cabotage' in international air law?

  1. The carriage of traffic between two points within the territory of a single State by an aircraft of another State Correct answer.
  2. The right to make a technical stop without traffic rights
  3. The right to overfly a State without landing
  4. The carriage of traffic between two States by a designated airline

Explanation

Cabotage is the carriage of passengers, mail or cargo between points within the territory of one State by an aircraft registered in another State. It is normally reserved to the national carrier and is excluded from the traffic rights granted under the International Air Services Transit Agreement. It is distinct from transit and technical stop rights.

Question 18Air Law

What is the purpose of the International Air Services Transit Agreement (IASTA)?

  1. To create a multilateral liability regime for passengers
  2. To grant the first and second freedoms of the air between participating States Correct answer.
  3. To establish common airworthiness standards
  4. To harmonise air traffic control procedures

Explanation

IASTA is a multilateral agreement by which participating States grant each other the privilege of overflight and of non-traffic stops for technical purposes, that is the first and second freedoms. It does not set airworthiness standards, liability rules or ATC procedures, which are handled by other instruments and Annexes.

Question 19Air Law

Under the Chicago Convention, how are the registration and nationality of an aircraft determined?

  1. By the State that issues the type certificate
  2. By the State where the operator's principal place of business is located
  3. By the State where the aircraft was manufactured
  4. By the laws and regulations of the State in which the aircraft is registered Correct answer.

Explanation

Article 17 provides that aircraft have the nationality of the State in which they are registered, and Article 19 leaves registration to the laws and regulations of that State. The place of manufacture, the operator's base and the type certificate holder do not determine nationality.

Question 20Air Law

An operator plans a flight that will cross the territory of a State that is not a party to the Chicago Convention. What is the normal legal position regarding that flight?

  1. The flight may proceed if the pilot holds a licence from any contracting State
  2. Overflight is permitted because the aircraft holds an ICAO certificate
  3. The Chicago Convention automatically applies to all States regardless of ratification
  4. Special permission must be obtained from that State before entry Correct answer.

Explanation

The Chicago Convention binds only States that are parties to it, so entry into the territory of a non-party State requires special permission or a separate bilateral arrangement. ICAO certificates and licences do not create rights of entry into non-party States, and ratification is not automatic.

Question 21Air Law

Which body of ICAO is responsible for adopting Annexes to the Convention as Standards and Recommended Practices?

  1. The Secretariat
  2. The Air Navigation Commission
  3. The Assembly
  4. The Council Correct answer.

Explanation

The Council adopts and amends the Annexes as Standards and Recommended Practices, acting on proposals originating from the Air Navigation Commission. The Assembly is the sovereign body that meets periodically and elects the Council. The Secretariat administers the organisation but does not adopt Annexes.

Question 22Air Law

What is the principal function of a certificate of airworthiness?

  1. To authorise the carriage of dangerous goods
  2. To certify the design of the aircraft type
  3. To certify that the individual aircraft is fit for flight in accordance with its approved type design Correct answer.
  4. To record the aircraft's nationality

Explanation

A certificate of airworthiness confirms that a particular aircraft conforms to its approved type design and is in a condition for safe operation, subject to continuing maintenance. The type design is certified separately by the type certificate. Nationality is recorded in the registration document, and dangerous goods carriage requires separate approval.

Question 23Air Law

A pilot is flying over the high seas and encounters another aircraft head-on at approximately the same level. Under the Rules of the Air, what action should each aircraft take?

  1. Both aircraft should alter heading to the right Correct answer.
  2. Both aircraft should alter heading to the left
  3. The faster aircraft should climb
  4. The aircraft with the higher maximum take-off mass should descend

Explanation

The Rules of the Air require aircraft approaching head-on, or nearly so, to alter heading to the right so that they pass clear of each other. The rule applies universally and does not depend on speed or mass. It also applies over the high seas because Annex 2 applies there without exception.

Question 24Air Law

Under Annex 1, what minimum age is normally required before a person may be issued a private pilot licence?

  1. 18 years
  2. 16 years
  3. 21 years
  4. 17 years Correct answer.

Explanation

Annex 1 sets the minimum age for issue of a private pilot licence at 17 years, while a student pilot may begin training at 16. Commercial pilot licences require 18 years and airline transport pilot licences 21 years. These are minimum standards that States may not relax for international operations.

Question 25Aircraft General Knowledge

What is the primary function of an aircraft's horizontal stabiliser?

  1. To provide lateral stability in a turn
  2. To house the main fuel tanks
  3. To provide longitudinal stability and pitch control Correct answer.
  4. To generate the majority of lift at low speed

Explanation

The horizontal stabiliser is mounted aft of the centre of gravity and produces a downward or trimming force that keeps the aircraft's nose from pitching up or down unintentionally. It also carries the elevators, which give the pilot pitch control. Lift generation and fuel storage are functions of the wing and fuselage, not the tailplane.

Question 26Aircraft General Knowledge

In a semi-monocoque wing structure, what is the main role of the stringers?

  1. They act as the primary attachment for the landing gear
  2. They stiffen the skin and help carry bending loads Correct answer.
  3. They carry the concentrated bending loads to the spar
  4. They provide the aerodynamic shape at the leading edge

Explanation

Stringers run spanwise along the inside of the skin and, together with the frames or ribs, prevent the thin skin from buckling while sharing bending loads. The skin itself carries much of the shear and torsion in a semi-monocoque design. Spars, not stringers, take the concentrated bending loads.

Question 27Aircraft General Knowledge

Which control surface is normally used to control roll?

  1. The ailerons Correct answer.
  2. The elevators
  3. The rudder
  4. The flaps

Explanation

Ailerons are hinged at the trailing edge of the outer wings and move in opposite directions, creating differential lift that rolls the aircraft about its longitudinal axis. The rudder controls yaw about the vertical axis and the elevators control pitch about the lateral axis. Flaps increase lift and drag for takeoff and landing rather than controlling roll.

Question 28Aircraft General Knowledge

What is the purpose of a trim tab on a primary control surface?

  1. To prevent flutter at high airspeed
  2. To hold a control force without continuous pilot input Correct answer.
  3. To increase the maximum deflection of the surface
  4. To lock the surface while the aircraft is parked

Explanation

A trim tab is a small auxiliary surface that deflects to create a hinge moment on the main control surface, allowing the aircraft to be balanced at a chosen speed and attitude with little or no stick force. It does not extend the travel of the primary surface or act as a gust lock. Mass balancing, not trim tabs, is used to counter flutter.

Question 29Aircraft General Knowledge

An aircraft with a constant-speed propeller is climbing at a fixed throttle setting. If the pilot increases the propeller pitch, what happens to engine RPM?

  1. RPM decreases because the blades take a bigger bite Correct answer.
  2. RPM increases because the blades bite more air
  3. RPM is unaffected by propeller pitch
  4. RPM remains constant because the governor compensates

Explanation

Increasing pitch makes each blade take a larger bite of air, raising the load on the engine and tending to slow it. The propeller governor then adjusts blade angle to hold the selected RPM, but the immediate tendency is a decrease. This is why pitch is described as the propeller's equivalent of a gear ratio.

Question 30Aircraft General Knowledge

Which statement best describes the function of a carburettor heat control?

  1. It cools the induction air to increase charge density
  2. It enriches the mixture automatically at high altitude
  3. It supplies heated air to the venturi to prevent ice formation Correct answer.
  4. It warms the fuel before it reaches the float chamber

Explanation

Carburettor icing occurs when fuel vaporisation and pressure drop in the venturi cool the air below freezing, allowing ice to form on the throttle butterfly and venturi. Carburettor heat admits air warmed by a muff around the exhaust, melting or preventing that ice. It does not heat the fuel itself or cool the charge.

Question 31Aircraft General Knowledge

During a magneto check, the engine RPM drops more than the manufacturer's limit when one magneto is selected. What is the most likely cause?

  1. The fuel mixture is too lean at idle
  2. The propeller is out of balance
  3. The oil pressure is too high
  4. The spark plugs on the selected magneto are fouled or the timing is faulty Correct answer.

Explanation

A magneto check compares the engine running on each magneto alone against both. An excessive drop on one magneto indicates that its circuit is weak, commonly from fouled plugs, a faulty harness or incorrect timing. The check is performed at a fixed RPM, so propeller balance and oil pressure do not explain a single-magneto drop.

Question 32Aircraft General Knowledge

What is the main advantage of a fuel injection system over a float-type carburettor?

  1. It eliminates the need for a fuel pump
  2. It removes the need for a mixture control
  3. It reduces the risk of induction icing and gives more even mixture distribution Correct answer.
  4. It allows the engine to run without an air supply

Explanation

Fuel injection meters fuel directly to each cylinder, so mixture distribution is more even and there is no venturi where ice can form, greatly reducing induction icing risk. It does not remove the need for a fuel pump or a mixture control. The engine still requires air in the normal way.

Question 33Aircraft General Knowledge

Why is oil temperature important to monitor in an air-cooled piston engine?

  1. Oil temperature has no effect on engine operation
  2. Oil that is too hot loses viscosity and fails to protect moving parts Correct answer.
  3. Cold oil is too thin and cannot lubricate
  4. Oil temperature directly controls the fuel mixture

Explanation

Oil viscosity falls as temperature rises, so excessively hot oil becomes too thin to maintain a protective film and may also indicate inadequate cooling or low quantity. Conversely, very cold oil is too thick to circulate freely. Oil temperature therefore gives an important indication of lubrication quality.

Question 34Aircraft General Knowledge

An aircraft has a 24-volt electrical system. What is the main purpose of the voltage regulator?

  1. To keep generator or alternator output within safe limits Correct answer.
  2. To convert AC to DC for the battery
  3. To increase battery capacity during flight
  4. To disconnect the battery during engine start

Explanation

The voltage regulator controls the field current of the generator or alternator so that output voltage stays within the design range regardless of engine speed and electrical load. This prevents over-voltage that could damage avionics or boil the battery. Rectification of AC to DC is done by diodes, not the regulator.

Question 35Aircraft General Knowledge

What happens to the indicated airspeed as an aircraft climbs at a constant true airspeed?

  1. It remains exactly the same
  2. It fluctuates randomly with altitude
  3. It increases because the air is colder
  4. It decreases because air density falls Correct answer.

Explanation

Indicated airspeed depends on dynamic pressure, which is a function of density and true airspeed. As altitude increases, density falls, so at constant true airspeed the dynamic pressure and hence indicated airspeed decrease. This is why true airspeed is higher than indicated airspeed at altitude.

Question 36Aircraft General Knowledge

What does the altimeter actually measure?

  1. Height above the ground directly
  2. Temperature lapse rate
  3. Rate of change of altitude
  4. Pressure from the static source referenced to a set datum Correct answer.

Explanation

The altimeter is a barometer calibrated in feet or metres, sensing static pressure and displaying the corresponding altitude for the pressure set in its subscale window. It therefore shows altitude relative to a selected pressure datum, not true height above the terrain. Rate of climb is shown by the vertical speed indicator.

Question 37Aircraft General Knowledge

Why must the pitot-static system's static ports be kept clear of ice and blockage?

  1. Blocked static ports cause errors in airspeed, altitude and vertical speed indications Correct answer.
  2. Blocked static ports increase engine power
  3. Blocked static ports only affect the compass
  4. Blocked static ports have no effect in level flight

Explanation

The altimeter, airspeed indicator and vertical speed indicator all use static pressure. If the static source is blocked, these instruments give false readings, and the airspeed indicator in particular may behave like an altimeter as the aircraft climbs or descends. Pitot heat and static drains help prevent such blockage.

Question 38Aircraft General Knowledge

What is the main function of the vertical speed indicator?

  1. To measure engine manifold pressure
  2. To show the aircraft's altitude above sea level
  3. To indicate the rate at which altitude is changing Correct answer.
  4. To display the aircraft's heading

Explanation

The vertical speed indicator senses the rate of change of static pressure and displays it as a climb or descent rate, usually in feet per minute. It lags briefly after a change because of the calibrated leak in its case. Altitude is shown by the altimeter and heading by the compass.

Question 39Aircraft General Knowledge

A turn coordinator differs from a turn and slip indicator mainly because it includes what feature?

  1. A magnetic heading reference
  2. A canted gyro that senses both yaw and roll rate Correct answer.
  3. A direct reading of angle of attack
  4. An automatic pitch trim function

Explanation

The turn coordinator uses a gyro canted so that it responds to roll rate as well as yaw rate, allowing it to show the correct rate of turn during bank entry and in a standard-rate turn. The older turn and slip indicator responds only to yaw. Neither instrument measures angle of attack or heading.

Question 40Aircraft General Knowledge

What causes real precession in a gyroscope?

  1. A change in the rotor's mass
  2. The absence of gravity
  3. An applied force acting on the spinning rotor Correct answer.
  4. Friction in the gimbal bearings

Explanation

Real precession occurs when an external torque is applied to a spinning gyroscope, causing its spin axis to move at right angles to the applied force. It is a physical response to torque, not a magnetic effect. Apparent precession, by contrast, is caused by the Earth's rotation.

Question 41Aircraft General Knowledge

Why is a magnetic compass subject to turning and acceleration errors?

  1. Its fluid becomes less viscous at altitude
  2. The compass card is affected by engine vibration
  3. The centre of gravity of the compass system is not at the pivot point Correct answer.
  4. The Earth's magnetic field varies with latitude

Explanation

The compass magnets align with the Earth's field, but the card's centre of gravity is below the pivot, so accelerations and turns tilt the card and produce temporary errors. These errors are most noticeable during turns through north and south and during acceleration or deceleration on easterly or westerly headings. They are not caused by fluid viscosity or vibration.

Question 42Aircraft General Knowledge

What is the purpose of a shear pin in a constant-speed propeller hub?

  1. To balance the propeller assembly
  2. To transfer torque from the engine to the propeller
  3. To protect the engine and propeller from overload by failing at a set torque Correct answer.
  4. To set the blade pitch angle

Explanation

A shear pin is designed to fail at a predetermined torque so that a sudden overload, such as a propeller strike, does not damage the engine or gearbox. It is a sacrificial component, not a load-carrying drive element in normal operation. Blade pitch is set by the pitch change mechanism.

Question 43Aircraft General Knowledge

A turbocharged engine loses manifold pressure at high altitude despite full throttle. Which explanation is most likely?

  1. The oil temperature is too low
  2. The wastegate is fully closed and the turbo is at its limit Correct answer.
  3. The magnetos are incorrectly timed
  4. The mixture is too rich at altitude

Explanation

When the wastegate is fully closed, the turbocharger is producing its maximum boost for the available exhaust energy and ambient conditions. Beyond that altitude the system cannot maintain the selected manifold pressure, so it falls off. Mixture, ignition timing and oil temperature do not directly limit turbo boost in this way.

Question 44Aircraft General Knowledge

What is the function of the wastegate in a turbocharger system?

  1. To regulate boost pressure by bypassing exhaust gas around the turbine Correct answer.
  2. To increase the compression ratio of the engine
  3. To cool the compressed air before it enters the engine
  4. To filter dust from the intake air

Explanation

The wastegate controls how much exhaust gas reaches the turbine. When the desired manifold pressure is reached, it opens to bypass exhaust around the turbine, limiting boost and preventing overboost. Intercoolers cool the charge, and air filters clean the intake.

Question 45Aircraft General Knowledge

What is the main purpose of an anti-servo tab on a stabilator?

  1. To increase control forces and improve feel Correct answer.
  2. To act as a backup elevator
  3. To provide additional lift at low speed
  4. To reduce the need for a horizontal stabiliser

Explanation

A stabilator is very sensitive because the whole surface moves, so an anti-servo tab is geared to move in the same direction as the stabilator, increasing the force needed to move it and improving control feel. It does not replace the stabiliser or provide lift. Its role is to make pitch control less sensitive.

Question 46Aircraft General Knowledge

Which of the following best describes the purpose of the aircraft's hydraulic system?

  1. To provide pressurisation for the cabin
  2. To cool the engine during high-power operation
  3. To transmit force for operating landing gear, brakes and flaps Correct answer.
  4. To supply electrical power to the avionics

Explanation

Hydraulic systems use pressurised fluid to transmit force and motion to actuators, commonly for landing gear, brakes, flaps and sometimes flight controls. They do not generate electricity, pressurise the cabin or cool the engine. Those functions belong to the electrical, pneumatic and cooling systems respectively.

Question 47Aircraft General Knowledge

During a pre-flight walk-around, a pilot notices a small amount of fuel staining around a wing fuel drain. What is the most appropriate action?

  1. Sample the drain to identify the fluid and investigate further Correct answer.
  2. Immediately take off to clear the leak
  3. Increase the fuel load to stop the leak
  4. Ignore it because small leaks are normal

Explanation

Any evidence of leakage should be investigated. Sampling the drain helps confirm whether the fluid is fuel, oil or hydraulic fluid, and further inspection can determine whether the leak is airworthy or needs maintenance. Ignoring a leak or attempting to fly is unsafe.

Question 48Aircraft General Knowledge

What is the primary function of an aircraft's fire detection system?

  1. To extinguish a fire automatically without pilot action
  2. To cool the engine compartment
  3. To monitor fuel quantity in the tanks
  4. To warn the crew of a fire so that they can respond Correct answer.

Explanation

Fire detection systems use sensors such as thermocouples or continuous loops to detect abnormal heat or flame and alert the crew. Extinguishing is normally the crew's action using the fire bottles. The system does not cool the engine or monitor fuel quantity.

Question 49Flight Performance and Planning

In aircraft performance work, which statement best defines density altitude?

  1. True altitude above mean sea level measured by radar
  2. Height above the nearest aerodrome reference point
  3. Pressure altitude corrected for temperature deviation from ISA Correct answer.
  4. Indicated altitude with the subscale set to QNH

Explanation

Density altitude is the pressure altitude adjusted for non-standard temperature, giving the altitude in the standard atmosphere at which the prevailing air density would occur. It is the parameter used whenever performance data must reflect actual air density, such as take-off distance and climb rate.

Question 50Flight Performance and Planning

An aeroplane is at an airfield where the outside air temperature is much colder than ISA. Compared with the same pressure altitude at ISA temperature, the density altitude is:

  1. Higher than the pressure altitude
  2. Equal to the pressure altitude
  3. Lower than the pressure altitude Correct answer.
  4. Independent of temperature

Explanation

Colder-than-standard air is denser, so the density altitude falls below the pressure altitude. Denser air improves engine power and lift, which is why performance is better than the ISA table value at that pressure altitude.