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KCAA PPL Exam practice questions

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Question 1Air Law and Kenya Civil Aviation Regulations

Under the Kenya Civil Aviation Regulations, which document certifies that an aircraft is airworthy and complies with its approved type design?

  1. Certificate of Maintenance Review
  2. Air Operator Certificate
  3. Certificate of Registration
  4. Certificate of Airworthiness Correct answer.

Explanation

The Certificate of Airworthiness is issued after the aircraft is shown to conform to its approved type design and to be in a condition for safe operation, and it must remain valid for flight. The Certificate of Registration only records ownership and nationality, while an Air Operator Certificate authorises the operator, not the individual aircraft.

Question 2Air Law and Kenya Civil Aviation Regulations

Which body is responsible for the regulation and safety oversight of civil aviation in Kenya?

  1. Kenya Airports Authority
  2. Kenya Civil Aviation Accident Investigation Board
  3. Kenya Civil Aviation Authority Correct answer.
  4. East African Civil Aviation Safety Agency

Explanation

The Kenya Civil Aviation Authority is the statutory regulator established to develop, regulate and oversee civil aviation safety and security in Kenya, including licensing of personnel and certification of aircraft and operators. Airport operation and accident investigation are separate functions carried out by other bodies.

Question 3Air Law and Kenya Civil Aviation Regulations

What is the validity period of a Class 2 medical certificate for a private pilot licence holder who is under 40 years of age and exercising private pilot privileges?

  1. 24 months Correct answer.
  2. 6 months
  3. 12 months
  4. 60 months

Explanation

For private pilot privileges, a Class 2 medical certificate remains valid for 24 months when the holder is under 40, reducing to 12 months once the holder reaches 40. Commercial and airline transport privileges attract shorter validity periods, which is why 12 months is often mistakenly applied to all cases.

Question 4Air Law and Kenya Civil Aviation Regulations

Before operating a flight, a pilot in command must be satisfied that the aircraft's mass and centre of gravity remain within limits. Which document provides the empty weight and moment data used for this calculation?

  1. The certificate of registration
  2. The aircraft flight manual loading schedule Correct answer.
  3. The journey log book
  4. The aircraft radio station licence

Explanation

The flight manual or associated weighing and loading schedule records the basic empty mass, the position of the centre of gravity and the moment arms, allowing the pilot to compute the loaded mass and balance. The other listed documents record ownership, flight history or radio authorisation and contain no mass data.

Question 5Air Law and Kenya Civil Aviation Regulations

An aircraft is being flown for private purposes with no remuneration. Which minimum crew is normally required for a single-engine aeroplane certified for single-pilot operation?

  1. One pilot Correct answer.
  2. One pilot and one cabin crew member
  3. One pilot and a flight engineer
  4. Two pilots

Explanation

Where the aeroplane's flight manual permits single-pilot operation, one pilot is the minimum crew for private flights, and that pilot acts as pilot in command. Additional crew members are required only where the type certification or the nature of the operation demands them.

Question 6Air Law and Kenya Civil Aviation Regulations

A private pilot wishes to carry passengers on a flight and to share the direct costs of fuel and landing fees. Under the regulations, which statement is correct?

  1. The pilot may charge a small profit if the passengers agree in advance
  2. The pilot may accept payment only if the operator holds an air operator certificate
  3. The pilot may share direct costs with passengers provided no profit is made and the flight is not advertised Correct answer.
  4. The pilot may not accept any contribution because the licence is private

Explanation

A private licence permits cost sharing of direct expenses such as fuel and landing fees among the pilot and passengers, provided no profit element exists and the flight is not held out to the public. Any remuneration beyond genuine cost sharing converts the flight into commercial air transport requiring an air operator certificate.

Question 7Air Law and Kenya Civil Aviation Regulations

Which of the following is the correct definition of the term 'pilot in command'?

  1. The most senior pilot on board by date of licence issue
  2. The pilot who manipulates the controls for the greater part of the flight
  3. The pilot who is designated by the operator to be responsible for the conduct of the flight Correct answer.
  4. The pilot who files the flight plan

Explanation

The pilot in command is the pilot designated by the operator, or in the case of general aviation the pilot themselves, as responsible for the safe conduct and operation of the aircraft during flight time. Control manipulation, seniority or administrative acts such as filing a flight plan do not confer that responsibility.

Question 8Air Law and Kenya Civil Aviation Regulations

An aircraft on a cross-country flight experiences a radio communication failure in controlled airspace under visual flight rules. What is the appropriate initial action?

  1. Continue under VFR, remain in VMC and land at the nearest suitable aerodrome, reporting arrival by the most expeditious means Correct answer.
  2. Turn back to the departure aerodrome regardless of weather conditions
  3. Squawk 7700 and continue the flight to the original destination without further action
  4. Climb immediately to the highest available level and hold until fuel is exhausted

Explanation

A VFR flight experiencing communications failure should continue in accordance with VFR, maintain VMC, and land at the nearest suitable aerodrome where a safe landing can be made, then report arrival to the appropriate unit as soon as practicable. Blindly continuing to destination or manoeuvring without regard to weather and traffic increases risk.

Question 9Air Law and Kenya Civil Aviation Regulations

What does a steady red light signal directed at an aircraft in flight mean?

  1. Return for landing
  2. Give way to other aircraft and continue circling Correct answer.
  3. Cleared to land
  4. Aerodrome unsafe, do not land

Explanation

For an aircraft in flight, a steady red light means give way to other aircraft and continue circling. A flashing red light means the aerodrome is unsafe and landing is prohibited, while a steady green light means cleared to land.

Question 10Air Law and Kenya Civil Aviation Regulations

An aircraft is on the ground and receives a flashing white light signal from the aerodrome control tower. What does this instruction mean?

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

Explanation

For an aircraft on the ground, a flashing white light means taxi clear of the landing area in use. Returning to the starting point is signalled by a flashing red light, and stopping is signalled by a steady red light.

Question 11Air Law and Kenya Civil Aviation Regulations

Which of the following describes the purpose of a runway holding position marking at an aerodrome?

  1. It marks the maximum take-off run available
  2. It indicates the touchdown zone for landing aircraft
  3. It shows the boundary of the apron parking area
  4. It marks the point beyond which an aircraft must not proceed without an explicit clearance Correct answer.

Explanation

A runway holding position marking, normally consisting of two solid and two dashed yellow lines, identifies where a taxiing aircraft must stop unless it has been cleared to enter or cross the runway. It protects the runway strip from unauthorised incursion and does not indicate landing distances or apron boundaries.

Question 12Air Law and Kenya Civil Aviation Regulations

An aircraft is being taxied at night on an aerodrome and sees a red obstacle light on a mast ahead. What does the light indicate?

  1. The obstruction exists and must be avoided Correct answer.
  2. The taxiway centreline continues past the mast
  3. The mast is a radio navigation aid
  4. The mast is safe to pass beneath at any height

Explanation

Red aviation obstruction lights mark hazards such as masts, towers and tall structures so that pilots can identify and avoid them. They convey no clearance to pass and do not indicate taxiway routing or navigation aid status.

Question 13Air Law and Kenya Civil Aviation Regulations

What is the primary purpose of a runway strip?

  1. To mark the boundary of the aerodrome movement area
  2. To provide a defined area around the runway to reduce the risk of damage to aircraft running off the runway Correct answer.
  3. To provide a prepared surface for aircraft parking
  4. To serve as the take-off run available for performance calculations

Explanation

The runway strip is a defined area including the runway and any stopway, intended to reduce the risk of damage to aircraft running off the runway and to protect aircraft flying over it during take-off or landing. It is not a parking surface and does not define the declared take-off run.

Question 14Air Law and Kenya Civil Aviation Regulations

In which circumstances must a pilot submit a flight plan before departure?

  1. Only when the aircraft carries more than six passengers
  2. Only when the flight crosses an international border
  3. For any flight in controlled airspace or along designated routes, and for flights requiring alerting service Correct answer.
  4. Only when the flight exceeds two hours' duration

Explanation

A flight plan is required for flights in controlled airspace, along designated airways and advisory routes, and whenever the pilot requires alerting service, including flights over water or remote terrain. Duration and passenger numbers are not the determining criteria, and international flights are not the only case.

Question 15Air Law and Kenya Civil Aviation Regulations

An aircraft is overtaking another aircraft in flight. Which aircraft has the right of way, and on which side should the overtaking aircraft pass?

  1. The aircraft being overtaken has right of way, and the overtaking aircraft passes on the left
  2. The faster aircraft has right of way and may pass on either side
  3. The aircraft with the higher performance category has right of way
  4. The aircraft being overtaken has right of way, and the overtaking aircraft passes on the right Correct answer.

Explanation

The aircraft being overtaken has the right of way, and the overtaking aircraft must keep clear by passing to the right. Passing to the left or asserting priority by speed or type is contrary to the right-of-way rules.

Question 16Air Law and Kenya Civil Aviation Regulations

Two aircraft of the same category are approaching head-on, or nearly so, and a risk of collision exists. What action should each pilot take?

  1. The aircraft with the higher speed maintains heading
  2. Both aircraft alter heading to the right Correct answer.
  3. The lower aircraft has right of way and maintains heading
  4. Both aircraft alter heading to the left

Explanation

When two aircraft approach head-on or nearly head-on and a risk of collision exists, each shall alter heading to the right. Turning left or relying on altitude or speed to resolve the conflict is contrary to the rules of the air.

Question 17Air Law and Kenya Civil Aviation Regulations

A pilot is flying at an altitude of 5,500 feet above mean sea level in an area where the transition altitude is 4,000 feet. Which altimeter setting should be used?

  1. QFE of the departure aerodrome
  2. Standard pressure 1013.25 hPa Correct answer.
  3. The local altimeter setting of the destination aerodrome
  4. QNH of the nearest aerodrome

Explanation

Above the transition altitude, aircraft fly at standard pressure settings so that all aircraft share a common reference and vertical separation is assured. QNH and QFE are used at or below the transition altitude, where terrain clearance is the priority.

Question 18Air Law and Kenya Civil Aviation Regulations

In the absence of any specific requirement, what is the minimum horizontal distance an aircraft should maintain from cloud when operating under VFR in controlled airspace at a cruising level below 10,000 feet?

  1. 2,000 metres
  2. 500 metres
  3. 1,500 metres Correct answer.
  4. 1,000 metres

Explanation

Standard VFR meteorological minima below 10,000 feet require flight with a horizontal distance from cloud of at least 1,500 metres and a vertical distance of at least 300 metres, with a flight visibility of at least 5 kilometres. Lesser distances apply only where a State has notified lower minima for specific airspace.

Question 19Air Law and Kenya Civil Aviation Regulations

A pilot operating below 10,000 feet in Class C airspace under VFR must maintain a flight visibility of at least what value?

  1. 3 kilometres
  2. 8 kilometres
  3. 5 kilometres Correct answer.
  4. 1.5 kilometres

Explanation

In controlled airspace at and below 10,000 feet, VFR flight requires a flight visibility of at least 5 kilometres together with the prescribed cloud clearance distances. Lower values apply only in notified special VFR or specific lower airspace cases.

Question 20Air Law and Kenya Civil Aviation Regulations

A pilot in command becomes incapacitated during flight. Who assumes command of the aircraft?

  1. The most senior cabin crew member
  2. The co-pilot, if one is carried, otherwise the next most qualified pilot on board Correct answer.
  3. The air traffic controller handling the flight
  4. The operator's duty manager on the ground

Explanation

Where a co-pilot is carried, that pilot assumes command on the incapacitation of the pilot in command; otherwise the next most suitably qualified pilot on board takes command. Cabin crew, controllers and ground managers have no authority to command the aircraft.

Question 21Air Law and Kenya Civil Aviation Regulations

An aircraft is involved in a serious incident in Kenya. Within what period must the pilot in command, if able, notify the investigating authority?

  1. Within 7 days
  2. Immediately by the quickest available means Correct answer.
  3. Within 48 hours
  4. Within 24 hours

Explanation

The pilot in command, or the operator where the pilot is unable, must notify the investigating authority of an accident or serious incident as soon as possible by the quickest available means. Delaying notification to a fixed later deadline would compromise the preservation of evidence and the safety response.

Question 22Air Law and Kenya Civil Aviation Regulations

Which of the following best describes the purpose of an occurrence reporting system in civil aviation?

  1. To punish individuals whose errors cause incidents
  2. To replace the accident investigation process
  3. To collect and analyse safety data so that hazards can be identified and systemic risks mitigated Correct answer.
  4. To provide evidence for insurance claims following an incident

Explanation

Occurrence reporting systems collect safety information so that hazards and trends can be analysed and corrective action taken to prevent recurrence. They are not disciplinary instruments and operate separately from formal accident investigation and insurance processes.

Question 23Air Law and Kenya Civil Aviation Regulations

A pilot operating a Kenyan-registered aircraft over another State must comply with which rules of the air?

  1. Only the rules of the departure aerodrome
  2. Only the rules of the State of registry
  3. The rules of the State in which the aircraft is flying, subject to the applicable international standards Correct answer.
  4. Only the rules of the destination aerodrome

Explanation

An aircraft operating over the territory of another State must comply with the rules in force there, which are expected to be consistent with ICAO Annex 2 standards. The rules of the State of registry govern the aircraft's certification and crew licensing, but local rules of the air apply in the airspace being used.

Question 24Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

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

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

Explanation

The four strokes occur in the fixed order intake, compression, power, exhaust. After the burning mixture has driven the piston down on the power stroke, the exhaust valve opens and the piston rises to expel the burnt gases. Ignition is an event that initiates combustion, not a separate stroke.

Question 25Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

The purpose of the magneto in an aircraft piston engine ignition system is to:

  1. Control the fuel-air mixture ratio entering the cylinders
  2. Measure engine cylinder head temperature
  3. Regulate the charging voltage supplied to the aircraft battery
  4. Generate a high-tension voltage that fires the spark plugs independently of the aircraft battery Correct answer.

Explanation

A magneto is a self-contained generator driven by the engine that produces the high voltage needed at the spark plugs. Because it uses permanent magnets rather than the aircraft battery, ignition continues to work even if the electrical system fails. This independence is why magnetos are retained rather than coil-and-battery ignition.

Question 26Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

During a normal pre-flight check, the engine is run with the magneto switch selected to LEFT and the RPM is observed to drop slightly. This indicates that:

  1. The spark plugs are completely fouled and no combustion is occurring
  2. The right magneto is faulty and must be replaced before flight
  3. The engine is over-speeding and the throttle must be reduced
  4. The left magneto circuit is functioning and the engine is running on the left magneto alone Correct answer.

Explanation

When the switch is set to LEFT, the right magneto is grounded and the engine runs on the left magneto only. A small, smooth RPM drop within the manufacturer's limits confirms the live magneto is working. A large drop or rough running would indicate a problem with the live magneto or its plugs.

Question 27Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

The main function of the carburettor heat control in a float-type carburettor installation is to:

  1. Increase manifold pressure at full throttle
  2. Supply warmed air to the carburettor to prevent or clear induction icing Correct answer.
  3. Enrich the mixture for take-off at high-density altitude
  4. Cool the fuel before it enters the venturi

Explanation

Carburettor icing occurs when fuel vaporisation and pressure drop in the venturi cool the air below freezing, allowing ice to form. Carburettor heat ducts air over the exhaust or a heat muff to warm the induction air, melting or preventing that ice. It is a temperature control, not a mixture or power control.

Question 28Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

A fixed-pitch propeller is described as having a 'coarse' pitch setting. Compared with a fine pitch, coarse pitch will:

  1. Take a larger bite of air per revolution, suiting higher cruise speeds Correct answer.
  2. Produce maximum static RPM at low forward speed
  3. Reduce the load on the engine at low airspeed
  4. Take a smaller bite of air per revolution, suiting take-off acceleration

Explanation

Blade angle determines how much air the propeller screws through per revolution. A coarse (high) pitch advances the blade further per turn, which is efficient at high true airspeed but loads the engine heavily at low speed. Fine pitch takes a smaller bite and allows the engine to reach higher RPM for take-off acceleration.

Question 29Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

In a constant-speed propeller system, the propeller governor maintains a selected RPM by:

  1. Varying the throttle opening to change manifold pressure
  2. Varying blade angle to change the load on the engine as airspeed and power change Correct answer.
  3. Varying the fuel flow to the engine
  4. Varying the ignition timing

Explanation

The governor senses engine RPM and adjusts oil pressure to the propeller hub to change blade angle. If RPM tends to rise, the governor increases blade angle to add load; if RPM falls, it decreases blade angle. This keeps RPM constant while the throttle sets the power.

Question 30Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

The primary purpose of the aircraft's static pressure system is to:

  1. Provide a reference pressure against which pitot (dynamic) pressure is compared to give airspeed Correct answer.
  2. Supply ram air pressure to the airspeed indicator
  3. Measure the outside air temperature for the altimeter
  4. Provide vacuum to drive the gyroscopic instruments

Explanation

The static system supplies undisturbed ambient pressure to the airspeed indicator, altimeter and vertical speed indicator. The airspeed indicator compares this static pressure with pitot pressure to compute dynamic pressure and hence airspeed. Blocked or erroneous static pressure therefore affects all three instruments.

Question 31Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

An aircraft climbs at a constant indicated airspeed while the static port is completely blocked. The airspeed indicator will:

  1. Under-read increasingly as altitude increases Correct answer.
  2. Fluctuate rapidly between zero and maximum
  3. Over-read increasingly as altitude increases
  4. Remain exactly correct because pitot pressure is unaffected

Explanation

With the static port blocked, trapped static pressure stays at the value present when the blockage occurred. As the aircraft climbs, true ambient pressure falls but the instrument still uses the trapped (higher) static pressure, so the computed pressure difference is too small. The airspeed indicator therefore under-reads, and the error grows with altitude.

Question 32Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

In a standard altimeter, the subscale (Kollsman) window is used to:

  1. Set the local pressure reference so the instrument indicates altitude above a chosen datum Correct answer.
  2. Set the aircraft's maximum permitted altitude
  3. Zero the vertical speed indicator
  4. Adjust the airspeed indicator for compressibility

Explanation

The altimeter is an aneroid barometer calibrated to show altitude for a given pressure setting. The pilot sets the subscale to QNH, QFE or standard pressure so that the indicated altitude references the intended datum. Without the correct setting, the indicated altitude will not correspond to the true height above that datum.

Question 33Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

Which instrument directly indicates the rate of climb or descent by sensing the rate of change of static pressure?

  1. Vertical speed indicator Correct answer.
  2. Airspeed indicator
  3. Turn coordinator
  4. Altimeter

Explanation

The vertical speed indicator contains a calibrated leak that delays the pressure inside its case relative to the static pressure supply. The resulting pressure difference is proportional to the rate at which static pressure is changing, which is displayed as feet per minute of climb or descent. The altimeter shows altitude, not its rate of change.

Question 34Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

A turn coordinator differs from a turn-and-slip indicator mainly because the turn coordinator:

  1. Uses a magnetic compass to indicate heading
  2. Displays rate of turn about both the roll and yaw axes, allowing it to indicate bank quality in a turn Correct answer.
  3. Measures vertical acceleration during turbulence
  4. Shows angle of attack directly

Explanation

The turn coordinator's gyro is canted so that it responds to both yaw and roll, making it useful for judging the quality of a turn and for standard-rate turns. The older turn-and-slip indicator responds mainly to yaw rate. Both use an inclinometer (ball) to show slip or skid.

Question 35Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

The suction gauge in an aircraft with vacuum-driven gyroscopic instruments indicates:

  1. The cabin differential pressure
  2. The pressure inside the pitot tube
  3. The vacuum available to drive the gyroscopes Correct answer.
  4. The fuel pump delivery pressure

Explanation

Vacuum-driven attitude and heading indicators rely on a stream of air drawn through the instrument cases by an engine-driven vacuum pump. The suction gauge shows the vacuum level so the pilot can confirm the gyros are receiving adequate driving force. Loss of suction means the gyros will slowly topple and the indications become unreliable.

Question 36Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

In an aircraft electrical system, the function of the voltage regulator associated with the alternator is to:

  1. Prevent the battery from discharging through the alternator at night
  2. Convert alternating current to direct current
  3. Limit the current drawn by the starter motor
  4. Hold the alternator output voltage within limits to protect the battery and equipment Correct answer.

Explanation

The voltage regulator controls the field current of the alternator so that output voltage stays within the designed range as load and RPM vary. This protects the battery from overcharging and the avionics from over-voltage. Rectification and reverse-current protection are separate functions.

Question 37Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

If the alternator fails in flight and the ammeter shows a continuous discharge, the pilot should expect that:

  1. The voltage regulator will automatically restore normal charging
  2. Only the engine ignition will be affected, since magnetos need no battery
  3. The battery alone is supplying the electrical load and will eventually be depleted Correct answer.
  4. The battery will be charged more rapidly by the failed alternator

Explanation

With the alternator offline, the battery becomes the only source of electrical power and supplies the bus until its stored energy is exhausted. The pilot should shed non-essential loads and plan to land before the battery is depleted. Magnetos are independent, but radios, lights and electric instruments are not.

Question 38Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

The fuel selector valve in a light aircraft is normally fitted so that the pilot can:

  1. Select which tank supplies the engine and shut off fuel flow in an emergency Correct answer.
  2. Drain water from the fuel strainer during flight
  3. Control the fuel pump output pressure
  4. Automatically meter the correct fuel-air mixture

Explanation

The fuel selector directs fuel from the chosen tank to the engine and usually includes an OFF position. Correct selection management prevents fuel starvation from an empty tank and allows isolation of a leaking system. Mixture and pump pressure are controlled by other components.

Question 39Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

During a pre-flight walk-around, a small amount of water is found in the fuel drain sample. The correct action is to:

  1. Reduce the mixture setting for the first part of the flight
  2. Ignore it, as water will be burned harmlessly in the engine
  3. Add a fuel additive to absorb the water
  4. Continue draining the sample until no water appears, then confirm the fuel is clear Correct answer.

Explanation

Water is denser than avgas and collects at the lowest points, so it is removed by draining from the sump until the sample runs clear. Water in the fuel system can cause engine stoppage or fuel starvation. Draining should continue until all traces of water and sediment are gone.

Question 40Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

In a light aircraft, the purpose of the fuel primer is to:

  1. Provide an alternate fuel supply if the main pump fails
  2. Deliver fuel directly to the cylinders to aid starting when the engine is cold Correct answer.
  3. Increase fuel pressure for take-off
  4. Enrich the mixture at high altitude

Explanation

A primer pump injects a small quantity of fuel into the induction system or cylinders so a cold engine has enough vaporised fuel to start. Once the engine is running, the primer is locked and the mixture control takes over. It is not a pressure or backup fuel system.

Question 41Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

The main structural advantage of a semi-monocoque fuselage over a pure monocoque design is that:

  1. The skin carries all loads without any internal framework
  2. It eliminates the need for any form of stress analysis
  3. It removes the need for a firewall between the engine and the cockpit
  4. Longerons, stringers and frames share the loads with the skin, allowing a lighter and more damage-tolerant structure Correct answer.

Explanation

In semi-monocoque construction the skin is stiffened by frames, stringers and longerons, so loads are distributed rather than carried by the skin alone. This permits a thinner skin and a lighter structure while improving resistance to buckling and damage. A pure monocoque relies entirely on the skin and is less efficient for aircraft fuselages.

Question 42Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

The purpose of a firewall in a light aircraft is to:

  1. Provide attachment for the landing gear
  2. Carry the wing bending loads into the fuselage
  3. Prevent fire in the engine compartment from reaching the cockpit and cabin Correct answer.
  4. Seal the cabin against pressurisation loss

Explanation

The firewall is a fire-resistant bulkhead between the engine compartment and the cockpit. Its purpose is to stop flames and hot gases from entering the occupied area if an engine fire occurs. It is a fire-protection feature rather than a primary load-carrying member.

Question 43Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

Aircraft brakes on a light aircraft most commonly use which principle to generate braking force?

  1. Pneumatic pressure acting on a drum
  2. Hydraulic pressure forcing friction pads against a rotating disc Correct answer.
  3. Electromagnetic eddy-current braking
  4. Mechanical expansion of a shoe against the tyre wall

Explanation

Hydraulic brake systems use the pilot's pedal to pressurise fluid, which pushes pistons in the brake caliper so pads clamp the disc. The friction converts kinetic energy into heat, slowing the aircraft. Drum brakes are found on some older types but the disc-and-caliper hydraulic system is the common modern arrangement.

Question 44Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

An aircraft is fitted with a fixed-pitch propeller and the pilot notices the static RPM during the run-up is below the manufacturer's minimum. A likely effect on take-off performance is:

  1. Reduced thrust and a longer take-off distance Correct answer.
  2. Higher rate of climb after lift-off
  3. Increased thrust and a shorter take-off distance
  4. No change, because static RPM does not affect thrust

Explanation

Static RPM reflects the power the engine can develop against the propeller load. A value below the minimum indicates the engine is not delivering normal power, so thrust is reduced and the take-off run lengthens. The aircraft should not be dispatched until the cause is identified.

Question 45Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

The exhaust gas temperature (EGT) gauge is most useful to the pilot because it:

  1. Indicates the oil temperature at the cooler outlet
  2. Measures the manifold pressure at the throttle plate
  3. Helps identify the mixture setting that gives peak EGT and allows operation at a chosen setting relative to peak Correct answer.
  4. Shows the cylinder head temperature directly

Explanation

As the mixture is leaned, EGT rises to a peak and then falls, so the gauge lets the pilot find peak EGT and then enrich or lean to a specified setting. This is the standard method for economical and safe mixture management. Cylinder head temperature and oil temperature are shown on separate gauges.

Question 46Aircraft General Knowledge (Airframe, Systems, Engines, Instruments)

During a climb at a constant throttle setting, the manifold pressure gauge reading will:

  1. Fall to zero once the aircraft leaves the ground
  2. Remain exactly constant regardless of altitude
  3. Decrease as altitude increases because ambient pressure falls Correct answer.
  4. Increase as altitude increases because the throttle opens wider

Explanation

Manifold pressure is the absolute pressure in the induction system, referenced to a vacuum. As the aircraft climbs, ambient pressure falls, so for a fixed throttle position the manifold pressure decreases. The pilot must often open the throttle progressively during a climb to maintain power.

Question 47Flight Performance and Planning (Mass and Balance, Performance, Flight Planning)

In light aircraft mass and balance, the datum is best described as:

  1. A fixed reference point from which all arm measurements are taken Correct answer.
  2. The centre of pressure of the wing at cruise angle of attack
  3. The maximum permissible mass of the aircraft
  4. The point about which the aircraft would balance if suspended

Explanation

The datum is an arbitrary but fixed reference plane or point from which all longitudinal arms are measured; it is not necessarily the balance point or the wing's centre of pressure. Because arms are measured from it, the datum must be defined consistently for every item loaded. It has no direct relationship with maximum mass.

Question 48Flight Performance and Planning (Mass and Balance, Performance, Flight Planning)

An aircraft has a maximum take-off mass of 1,100 kg and an empty mass of 700 kg. With full fuel of 120 kg and a pilot of 80 kg, how much payload (baggage and passengers) can still be carried?

  1. 280 kg
  2. 200 kg Correct answer.
  3. 400 kg
  4. 320 kg

Explanation

Remaining payload equals maximum take-off mass minus empty mass minus fuel minus pilot: 1,100 − 700 − 120 − 80 = 200 kg. This is the margin left before exceeding the structural limit. Any additional load beyond this figure would put the aircraft over its maximum take-off mass.

Question 49Flight Performance and Planning (Mass and Balance, Performance, Flight Planning)

Moving a 20 kg item 0.5 m aft within the cabin changes the aircraft's centre of gravity by an amount determined primarily by:

  1. The item mass multiplied by the shift, divided by the total aircraft mass Correct answer.
  2. The total aircraft mass multiplied by the shift distance
  3. The shift distance alone, independent of mass
  4. The item mass divided by the total aircraft mass

Explanation

The moment change equals mass times arm shift, and the centre of gravity shift equals that moment change divided by the total mass. A heavier item or a larger shift produces a bigger movement. The shift distance alone is insufficient because the item's mass governs the moment.

Question 50Flight Performance and Planning (Mass and Balance, Performance, Flight Planning)

Loading an aircraft so that its centre of gravity lies ahead of the forward limit is most likely to:

  1. Have no effect on handling but reduce cruise speed
  2. Increase the elevator force required to flare and lengthen the take-off run Correct answer.
  3. Increase the tendency to pitch up on approach
  4. Improve take-off performance and reduce stick forces

Explanation

A forward centre of gravity increases the nose-down moment, so more nose-up elevator force is needed and rotation and flare are harder. The take-off run and landing distance typically increase. The aircraft becomes more stable but less manoeuvrable, and stall recovery forces rise.