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KCAA IR Theory practice questions

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Question 1Air Law and Kenya Civil Aviation Regulations

Under the Kenya Civil Aviation Act, which body is the principal regulatory authority responsible for the safety and oversight of civil aviation in Kenya?

  1. The Kenya Civil Aviation Accident Investigation Board
  2. The National Transport and Safety Authority
  3. The Kenya Airports Authority
  4. The Kenya Civil Aviation Authority Correct answer.

Explanation

The Kenya Civil Aviation Authority (KCAA) is the statutory regulator established under the Civil Aviation Act, responsible for safety oversight, licensing, and enforcement of civil aviation regulations. Airport operations are handled by a separate authority, and accident investigation is a distinct function. The NTSA deals with road transport, not aviation.

Question 2Air Law and Kenya Civil Aviation Regulations

Which ICAO annex forms the primary international standards basis for the licensing of flight crew and other aviation personnel?

  1. Annex 8 – Airworthiness of Aircraft
  2. Annex 6 – Operation of Aircraft
  3. Annex 11 – Air Traffic Services
  4. Annex 1 – Personnel Licensing Correct answer.

Explanation

Annex 1 to the Chicago Convention sets the standards and recommended practices for licensing flight crew, air traffic controllers, and other personnel. The other annexes govern aircraft operations, airworthiness, and air traffic services respectively, and do not contain the personnel licensing standards.

Question 3Air Law and Kenya Civil Aviation Regulations

In Kenya, an aircraft may not fly unless it holds a valid certificate of airworthiness that was issued or validated by which authority?

  1. The insurer of the aircraft
  2. The aircraft manufacturer
  3. The Kenya Civil Aviation Authority Correct answer.
  4. The operator's approved maintenance organisation

Explanation

The certificate of airworthiness is a regulatory document issued or validated by the State of Registry, which in Kenya is the KCAA. Maintenance organisations and manufacturers provide supporting data but cannot issue the state certificate. Insurers have no airworthiness authority.

Question 4Air Law and Kenya Civil Aviation Regulations

Which document issued by the KCAA authorises an air operator to conduct commercial air transport operations and specifies the types and scope of operations permitted?

  1. Air Operator Certificate Correct answer.
  2. Maintenance Release Certificate
  3. Certificate of Registration
  4. Aircraft Radio Station Licence

Explanation

An Air Operator Certificate (AOC) is issued to an operator after it demonstrates compliance with the applicable operating regulations, and it lists the types of aircraft and kinds of operations authorised. A certificate of registration only records title and nationality, while radio and maintenance documents do not authorise commercial transport.

Question 5Air Law and Kenya Civil Aviation Regulations

Under the Chicago Convention, each contracting State must ensure that aircraft on its register carry which marks identifying nationality and registration?

  1. The operator's AOC number
  2. The nationality mark and the registration mark Correct answer.
  3. The airworthiness certificate number
  4. The airline's logo and flight number

Explanation

Article 20 of the Chicago Convention requires aircraft engaged in international navigation to bear its appropriate nationality and registration marks. These marks identify the State of Registry and the specific aircraft. Airline branding, certificate numbers, and AOC numbers do not serve this international identification function.

Question 6Air Law and Kenya Civil Aviation Regulations

A pilot's licence issued by a foreign ICAO contracting State is used to exercise the privileges of that licence on a Kenyan-registered aircraft. Which principle governs whether KCAA may recognise that foreign licence?

  1. Automatic recognition of any foreign licence without conditions
  2. Recognition only for private operations and never for commercial operations
  3. Recognition only if the pilot also holds a Kenyan passport
  4. Validation or conversion in accordance with KCAA requirements Correct answer.

Explanation

The Chicago Convention allows a State to recognise foreign licences rendered valid by another contracting State, but the State of Registry or operator applies its own validation or conversion requirements. KCAA therefore validates or converts foreign licences under its published requirements rather than granting unconditional recognition. Nationality of the pilot and blanket bans on commercial use are not the governing criteria.

Question 7Air Law and Kenya Civil Aviation Regulations

An operator wishes to add a new aircraft type to its existing Kenyan AOC. What is the correct regulatory action before conducting commercial flights with that type?

  1. Register the aircraft and begin operations without further approval
  2. Obtain only the manufacturer's type acceptance letter
  3. Obtain KCAA approval of the type addition to the operations specifications Correct answer.
  4. Begin operations and notify KCAA within 30 days

Explanation

Adding a new type requires the operator to demonstrate compliance with the applicable requirements and to obtain KCAA approval of the revised operations specifications before commercial use. Post-hoc notification, manufacturer letters, or mere registration do not substitute for regulatory approval. This ensures crew, maintenance, and operational capability are assessed first.

Question 8Air Law and Kenya Civil Aviation Regulations

Under the KCAA regulations, which person holds ultimate responsibility for the safe operation of a commercial air transport flight?

  1. The pilot-in-command Correct answer.
  2. The operator's chief executive officer
  3. The air traffic controller on duty
  4. The maintenance manager

Explanation

The pilot-in-command is responsible for the safe operation of the aircraft and for compliance with regulations during the flight. The operator holds corporate responsibility for the overall system, but the in-flight command authority rests with the PIC. Controllers and maintenance managers have defined roles that do not displace this command responsibility.

Question 9Air Law and Kenya Civil Aviation Regulations

A Kenyan operator's aircraft is involved in a serious incident in a foreign State. Which State is primarily responsible for instituting the investigation under Annex 13?

  1. The State of Manufacture
  2. The State of the Operator
  3. The State of Registry
  4. The State of Occurrence Correct answer.

Explanation

Under Annex 13 the State of Occurrence is responsible for instituting the investigation into an accident or serious incident on its territory. Other States, such as the State of Registry, Operator, and Manufacture, have entitlements to participate and provide information. The State of Occurrence may delegate the investigation to another State by agreement.

Question 10Air Law and Kenya Civil Aviation Regulations

Which of the following best describes the purpose of a mandatory occurrence reporting system under Kenyan civil aviation regulations?

  1. To assign legal liability for each occurrence
  2. To punish individuals who report errors
  3. To replace the need for routine inspections
  4. To collect and analyse safety data so that hazards can be identified and mitigated Correct answer.

Explanation

Mandatory occurrence reporting exists to gather safety information that supports hazard identification, risk assessment, and corrective action within a safety management system. Its purpose is preventive, not punitive, and it complements rather than replaces inspections. It does not determine legal liability.

Question 11Air Law and Kenya Civil Aviation Regulations

Which minimum medical standard must be met by a holder of a Kenyan Class 1 medical certificate to exercise commercial pilot privileges?

  1. A medical assessment by any general practitioner
  2. A self-declaration of fitness by the pilot
  3. Periodic medical examinations by a KCAA-approved medical examiner to the applicable standards Correct answer.
  4. An annual examination by the operator's safety manager

Explanation

Class 1 medical certification requires examination by a designated or approved medical examiner against the prescribed medical standards, with validity periods set by regulation. Self-declaration and examinations by unapproved persons do not satisfy the requirement. The operator's safety manager is not a medical certification authority.

Question 12Air Law and Kenya Civil Aviation Regulations

An aircraft registered in Kenya is sold to a new owner who intends to continue operating it in Kenya. What must be done regarding the certificate of registration?

  1. The change of ownership must be recorded and the registration updated with KCAA Correct answer.
  2. Nothing, because the registration mark remains unchanged
  3. Only the insurer needs to be notified
  4. The aircraft must be exported and re-imported

Explanation

A change of ownership must be notified to the registry and the registration records updated so that the lawful owner is correctly identified. The registration mark may remain the same, but the register entry must reflect the new owner. Insurer notification and export/re-import are not substitutes for updating the register.

Question 13Air Law and Kenya Civil Aviation Regulations

Under the Chicago Convention, which article establishes that the rules of the air to be followed are those of the State whose territory is being overflown?

  1. Article 33 – Recognition of certificates and licences
  2. Article 12 – Rules of the Air Correct answer.
  3. Article 5 – Non-scheduled flights
  4. Article 13 – Entry and clearance regulations

Explanation

Article 12 requires each contracting State to ensure that aircraft within its territory comply with its rules of the air, which must conform to ICAO standards. The other articles address non-scheduled flight, entry and clearance, and recognition of certificates. They do not establish the rules-of-the-air obligation.

Question 14Air Law and Kenya Civil Aviation Regulations

A Kenyan operator plans to wet-lease a foreign-registered aircraft for a short period. Which consideration is most relevant to KCAA approval of that arrangement?

  1. The safety oversight arrangements and regulatory compliance of the foreign operator Correct answer.
  2. The currency used for the lease payment
  3. The colour scheme of the aircraft
  4. The nationality of the passengers

Explanation

KCAA evaluates whether the foreign operator and aircraft are subject to adequate safety oversight and comply with the applicable requirements before approving a wet lease. Cosmetic, passenger nationality, and payment currency issues are not regulatory approval criteria. The oversight arrangements are central to protecting safety.

Question 15Air Law and Kenya Civil Aviation Regulations

Which of the following is a characteristic of a Safety Management System required of a Kenyan air operator?

  1. A system limited to reporting accidents only
  2. A system that replaces the operator's quality assurance entirely
  3. A systematic approach including hazard identification, risk assessment, and safety assurance Correct answer.
  4. A system operated solely by the regulator

Explanation

An SMS is a systematic, management-based approach that includes safety policy, hazard identification, risk assessment, safety assurance, and safety promotion. It is not limited to accident reporting and does not eliminate quality assurance functions. The operator, not the regulator, operates the SMS.

Question 16Air Law and Kenya Civil Aviation Regulations

Which category of aircraft noise or emissions requirement does Annex 16 address?

  1. Environmental protection, including aircraft noise and engine emissions Correct answer.
  2. Personnel licensing standards
  3. Aircraft accident investigation
  4. Rules of the air

Explanation

Annex 16 to the Chicago Convention deals with environmental protection, covering aircraft noise certification and engine emissions. Personnel licensing, rules of the air, and accident investigation are addressed by other annexes. Kenya implements these standards through its own environmental and airworthiness regulations.

Question 17Air Law and Kenya Civil Aviation Regulations

An air traffic controller in Kenya is found to have provided a clearance that contributed to a serious incident. Which principle best describes the regulator's primary approach under a just culture?

  1. Distinguishing between unintentional human error and wilful or reckless conduct Correct answer.
  2. Suppressing the incident report to protect the controller
  3. Automatic criminal prosecution of the controller
  4. Immediate revocation of the controller's licence regardless of circumstances

Explanation

A just culture separates honest error from wilful violation or gross negligence, allowing safety learning while preserving accountability for reckless conduct. Automatic revocation or prosecution regardless of circumstances undermines reporting. Suppressing reports is contrary to safety management principles.

Question 18Air Law and Kenya Civil Aviation Regulations

Which condition must be satisfied for an aircraft to be eligible for registration in Kenya?

  1. The aircraft must have been manufactured in Kenya
  2. The aircraft must have a foreign registration in force
  3. The aircraft must be owned by a Kenyan citizen or a body established in Kenya, subject to KCAA requirements Correct answer.
  4. The aircraft must be operated exclusively for private purposes

Explanation

Kenyan registration requirements tie eligibility to ownership or residence criteria and to compliance with KCAA registration rules. Manufacturing location, exclusive private use, and holding a foreign registration are not eligibility conditions. In fact, dual registration is not permitted.

Question 19Air Law and Kenya Civil Aviation Regulations

Which of the following best explains the legal effect of the Chicago Convention on Kenya's domestic aviation regulations?

  1. The Convention has no effect on domestic regulation
  2. Kenya implements the Convention's standards through its own legislation and regulations Correct answer.
  3. The Convention applies only to aircraft registered in the United States
  4. The Convention directly overrides all domestic law without further action

Explanation

The Chicago Convention creates obligations for contracting States, which implement those obligations through national legislation and regulations such as the Civil Aviation Act and KCAA regulations. The Convention is not self-executing in that manner and is not limited to one State. It clearly influences domestic regulation.

Question 20Air Law and Kenya Civil Aviation Regulations

Which factor most directly determines the required aircraft maintenance programme for a Kenyan-registered aircraft used in commercial air transport?

  1. The aircraft type design and the operator's approved maintenance programme Correct answer.
  2. The number of passengers carried on the previous flight
  3. The preference of the pilot-in-command
  4. The airport of departure

Explanation

The maintenance programme is derived from the type design and the manufacturer's recommendations, and must be approved by the regulator for the operator. Pilot preference, previous passenger loads, and departure airport do not determine the programme. Approval ensures continued airworthiness is maintained.

Question 21Air Law and Kenya Civil Aviation Regulations

Which of the following is the correct description of a Certificate of Airworthiness validity period for a Kenyan-registered aircraft?

  1. It is valid for a specified period and subject to continuing airworthiness requirements Correct answer.
  2. It is valid indefinitely once issued
  3. It is valid only for the first flight after issue
  4. It expires only when the aircraft is sold

Explanation

A certificate of airworthiness is issued for a defined validity period and remains valid only while the aircraft complies with continuing airworthiness requirements, including maintenance and inspections. It is not indefinite and does not lapse merely on sale. It is not limited to a single flight.

Question 22Air Law and Kenya Civil Aviation Regulations

Which of the following actions by an air operator would most likely constitute a violation of the regulations on flight and duty time limitations?

  1. Providing rest periods that exceed the minimum requirement
  2. Scheduling a pilot within the prescribed flight time limits
  3. Rostering a pilot beyond the maximum flight duty period without an approved extension Correct answer.
  4. Recording duty times accurately in the operator's records

Explanation

Flight and duty time limitations set maximum duty and flight periods to manage fatigue; exceeding them without an approved extension breaches the regulations. Complying with limits, providing adequate rest, and accurate record-keeping are required, not violations. Fatigue management is a core safety obligation.

Question 23Air Law and Kenya Civil Aviation Regulations

Which of the following is a requirement for the carriage of dangerous goods on a commercial flight operated by a Kenyan operator?

  1. Dangerous goods may be carried without any training if the quantity is small
  2. Personnel must be trained and the carriage must comply with the applicable dangerous goods regulations Correct answer.
  3. No documentation is required for dangerous goods shipments
  4. Dangerous goods may be carried only in the passenger cabin

Explanation

Carriage of dangerous goods requires compliance with the applicable dangerous goods regulations, including proper classification, packaging, documentation, and trained personnel. Small quantity does not remove the requirement. Dangerous goods are generally prohibited in the cabin except for permitted items, and documentation is mandatory.

Question 24Air Law and Kenya Civil Aviation Regulations

Under the KCAA enforcement framework, which of the following is an appropriate regulatory response to a repeated failure by a certificate holder to correct a safety deficiency?

  1. Ignoring the deficiency if no accident has occurred
  2. Transferring the deficiency to another operator
  3. Suspension or revocation of the certificate in accordance with the regulations Correct answer.
  4. Issuing a warning and taking no further action

Explanation

When a certificate holder fails to correct a safety deficiency, the regulator may escalate enforcement, including suspension or revocation of the certificate, in accordance with the regulations. A warning alone may be insufficient for repeated failures. Transferring or ignoring the deficiency is not a lawful response.

Question 25Air Law and Kenya Civil Aviation Regulations

Which of the following best describes the role of the operations manual for a Kenyan air operator?

  1. It is a document that replaces the need for training
  2. It is a required document that sets out procedures and must be approved or accepted by KCAA Correct answer.
  3. It is an optional reference document for pilots
  4. It is a marketing document for passengers

Explanation

The operations manual is a required document that contains the procedures and instructions necessary for operations and must be approved or accepted by the regulator. It is not optional and does not replace training. It is an operational control document, not marketing material.

Question 26Air Law and Kenya Civil Aviation Regulations

Under the Kenya Civil Aviation Act, which document issued by the KCAA authorises a person to act as a flight dispatcher for a Kenyan air operator?

  1. A private pilot licence with an instrument rating
  2. An air traffic controller licence issued by the KCAA
  3. A flight operations officer certificate issued by the operator
  4. A flight dispatcher licence issued by the KCAA Correct answer.

Explanation

The Kenya Civil Aviation Act and the associated licensing regulations require flight dispatchers to hold a licence issued by the KCAA. Operator-issued certificates and pilot or controller licences do not confer flight dispatcher privileges. The licence is specific to the flight dispatch function and is not interchangeable with other aviation personnel licences.

Question 27Air Law and Kenya Civil Aviation Regulations

Which of the following is the primary purpose of the Kenya Civil Aviation Regulations as they apply to air operators?

  1. To ensure the safety and regularity of civil aviation operations in Kenya Correct answer.
  2. To determine the routes that may be served by foreign air carriers
  3. To prescribe the commercial fares that Kenyan air operators may charge
  4. To set the maximum working hours for all aviation employees

Explanation

The Kenya Civil Aviation Regulations are promulgated to give effect to the Civil Aviation Act and to ensure that civil aviation operations in Kenya are conducted safely and regularly. They establish standards for personnel, aircraft, and operations rather than commercial fares or foreign route allocation. Working time limits for aviation employees are addressed in other labour legislation, not as the primary purpose of the regulations.

Question 28Air Law and Kenya Civil Aviation Regulations

A Kenyan air operator plans to conduct a flight over a foreign State without landing there. Under the Chicago Convention, which permission must the operator obtain from that foreign State?

  1. An air operator certificate issued by that State
  2. A certificate of airworthiness validation
  3. An overflight permission or transit agreement Correct answer.
  4. A special permission for each individual flight

Explanation

Under Article 1 of the Chicago Convention each State has complete and exclusive sovereignty over the airspace above its territory. Article 2 confirms that territory includes territorial waters, and Article 3 requires that non-scheduled flights over a State's territory obtain permission. In practice this permission is given through a transit agreement or a specific overflight authorisation, not through the operator's own State certificate.

Question 29Air Law and Kenya Civil Aviation Regulations

A Kenyan air operator's aircraft is destroyed in an accident in Kenya. Which action is required of the operator with respect to the aircraft's certificate of registration under the Kenya Civil Aviation Regulations?

  1. Apply to register the same certificate on a replacement aircraft
  2. Return the certificate of registration to the KCAA Correct answer.
  3. Retain the certificate until the accident investigation is complete
  4. Transfer the certificate to the insurer of the aircraft

Explanation

The Kenya Civil Aviation Regulations require that when an aircraft is destroyed or permanently withdrawn from use, the certificate of registration be returned to the KCAA. The certificate is a State document and cannot be retained by the operator or transferred to a third party. A replacement aircraft requires its own registration process and a new certificate.

Question 30Air Law and Kenya Civil Aviation Regulations

An air operator in Kenya wishes to change its approved maintenance control manual. Under the KCAA regulatory framework, which procedure must the operator follow before implementing the change?

  1. Submit the revised manual to the manufacturer for approval only
  2. Obtain prior approval from the KCAA for the revised manual Correct answer.
  3. Implement the change immediately and notify the KCAA within 30 days
  4. Adopt the change if it is consistent with the operator's safety management system

Explanation

The Kenya Civil Aviation Regulations require that an operator obtain prior approval from the KCAA before implementing changes to approved maintenance control manuals. The manual is part of the operator's approved maintenance organisation and changes affect airworthiness compliance. Internal consistency with the safety management system or manufacturer approval does not substitute for KCAA approval.

Question 31Aircraft General Knowledge - Instruments

In a light aircraft, which instrument is connected directly to the static pressure source and displays altitude above a selected reference pressure?

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

Explanation

The altimeter is a pressure-sensitive instrument whose capsule responds only to static pressure, and the subscale allows the pilot to set the reference pressure so that indicated altitude is displayed. The airspeed indicator uses both pitot and static pressure, while the VSI and turn coordinator respond to other quantities.

Question 32Aircraft General Knowledge - Instruments

During descent with the pitot heater off, ice blocks the pitot tube while the static port remains clear. What does the airspeed indicator do?

  1. It oscillates rapidly around the true airspeed
  2. It freezes at the value shown when the blockage occurred
  3. It behaves like an altimeter, reading higher as the aircraft descends Correct answer.
  4. It under-reads steadily as altitude increases

Explanation

With a blocked pitot tube the trapped pressure stays constant, so the instrument responds only to changes in static pressure. In a descent static pressure rises, the pressure difference across the capsule falls, and the pointer moves toward a lower airspeed, giving altimeter-like behaviour.

Question 33Aircraft General Knowledge - Instruments

With the static port blocked but the pitot tube clear, what happens to the airspeed indication during a climb?

  1. It over-reads increasingly as altitude increases Correct answer.
  2. It remains correct because pitot pressure is unaffected
  3. It drops to zero
  4. It under-reads increasingly as altitude increases

Explanation

A blocked static port traps the static pressure present at the time of blockage, so the capsule sees a pitot pressure that falls with altitude against a static pressure that stays too high. The pressure difference therefore grows and the airspeed indicator over-reads, increasingly so as the climb continues.

Question 34Aircraft General Knowledge - Instruments

An aircraft climbs at a constant true airspeed. How do the indicated and true airspeeds compare as altitude increases?

  1. Indicated airspeed rises while true airspeed falls
  2. Indicated airspeed stays constant while true airspeed falls
  3. Indicated airspeed falls while true airspeed stays constant Correct answer.
  4. Both indicated and true airspeed rise together

Explanation

Indicated airspeed depends on dynamic pressure, which for a given true airspeed decreases as air density falls with altitude. Maintaining a constant true airspeed therefore results in a lower indicated airspeed, which is why true airspeed exceeds indicated airspeed at altitude.

Question 35Aircraft General Knowledge - Instruments

What is the purpose of the coloured white arc on a light aircraft airspeed indicator?

  1. It marks the maximum gear extension speed
  2. It marks the never-exceed speed
  3. It marks the flap operating range from VS0 to VFE Correct answer.
  4. It marks the normal operating range from VS1 to VNO

Explanation

The white arc defines the range in which flight with flaps extended is permitted, its lower limit being the stall speed in the landing configuration VS0 and its upper limit the maximum flap extended speed VFE. The green arc, by contrast, covers the normal operating range.

Question 36Aircraft General Knowledge - Instruments

What does the yellow arc on an airspeed indicator indicate?

  1. A range to be used only in smooth air Correct answer.
  2. A range in which flap extension is permitted
  3. The range below the stall speed
  4. The range in which the autopilot may be engaged

Explanation

The yellow arc lies between VNO and VNE and represents a caution range in which flight is permissible only in smooth air, since manoeuvring or gust loads could otherwise overstress the structure. It is not a limitation on configuration but on turbulence exposure.

Question 37Aircraft General Knowledge - Instruments

How does a vertical speed indicator differ fundamentally from an altimeter in the way it uses static pressure?

  1. It compares total pressure with a sealed reference
  2. It uses pitot pressure instead of static pressure
  3. It measures the rate of change of static pressure rather than its absolute value Correct answer.
  4. It uses a gyroscope to sense vertical motion

Explanation

The VSI capsule responds to the difference between the current static pressure and a delayed static pressure fed through a calibrated leak, so a steady state gives a zero reading and only changes in pressure produce a deflection. The altimeter, by contrast, displays the absolute value of static pressure as an altitude.

Question 38Aircraft General Knowledge - Instruments

Why does a conventional VSI show a lag when the aircraft begins to climb or descend?

  1. The gyro needs time to spin up to operating speed
  2. The calibrated leak between capsule and case takes time to equalise pressures Correct answer.
  3. The pointer is damped by a magnet
  4. The static port is deliberately restricted to protect the capsule

Explanation

The VSI works by comparing instantaneous static pressure in the capsule with a delayed pressure in the instrument case, and the restrictor that creates the delay also creates a lag of several seconds before the indication stabilises. Modern instantaneous types reduce this by using an accelerometer-assisted mechanism.

Question 39Aircraft General Knowledge - Instruments

In a turn indicator, what does the inclinometer (slip ball) actually show?

  1. The bank angle relative to the horizon
  2. Whether the resultant of gravity and centrifugal force acts along the aircraft vertical Correct answer.
  3. The rate of turn in degrees per second
  4. The aircraft pitch attitude

Explanation

The ball moves within a curved tube according to the balance between gravity and centrifugal force, so a centred ball means the resultant force is aligned with the aircraft's vertical axis and the turn is coordinated. It is not a direct measurement of bank angle or rate of turn.

Question 40Aircraft General Knowledge - Instruments

An aircraft in a level turn shows the slip ball deflected to the outside of the turn. What does this indicate and what action is required?

  1. Coordinated turn; no action
  2. Slipping turn; reduce bank or increase rudder into the turn Correct answer.
  3. Skidding turn; increase bank
  4. Nose-up attitude; lower the nose

Explanation

The ball moves to the outside of the turn when the rate of turn is too low for the bank, which is a slip, so the pilot must either reduce bank or apply more rudder into the turn to centre the ball. A skid is the opposite condition, with the ball deflected to the inside of the turn.

Question 41Aircraft General Knowledge - Instruments

What is the fundamental property of a gyroscope that allows it to provide a stable attitude reference?

  1. Dependence on the Earth's magnetic field
  2. Rigidity in space when spinning at high speed Correct answer.
  3. Sensitivity to linear acceleration
  4. Ability to measure static pressure

Explanation

A rapidly spinning rotor resists changes to the orientation of its spin axis, a property known as rigidity in space, which allows the attitude indicator and heading indicator to hold a reference. Precession is the second property and is used deliberately in rate instruments.

Question 42Aircraft General Knowledge - Instruments

What causes apparent drift of a heading indicator after a long flight in high latitudes?

  1. Magnetic variation changes along the route
  2. Earth rate, arising from the rotation of the Earth beneath the gyro Correct answer.
  3. Real drift caused by bearing friction only
  4. Pitot pressure entering the instrument case

Explanation

Because the gyro spin axis stays fixed in inertial space while the Earth rotates, the instrument appears to drift relative to the local meridian, and the effect grows with latitude. This apparent drift is corrected by the pilot by realigning the heading indicator with the magnetic compass at intervals.

Question 43Aircraft General Knowledge - Instruments

What type of gyro and mounting does a turn indicator use?

  1. A rate gyro with one degree of freedom, sensing yaw rate Correct answer.
  2. A vertical gyro with two degrees of freedom, sensing pitch
  3. A magnetic gyro slaved to the flux valve
  4. A laser ring gyro sensing acceleration

Explanation

The turn indicator uses a rate gyro whose spin axis is horizontal and restrained by a calibrated spring so that precession is proportional to the rate of turn about the vertical axis. It is therefore a one-degree-of-freedom instrument, unlike the two-degree-of-freedom attitude and heading gyros.

Question 44Aircraft General Knowledge - Instruments

In a suction-driven gyroscopic system, what does a low suction gauge reading most directly threaten?

  1. The pitot pressure supplied to the airspeed indicator
  2. The electrical supply to the turn coordinator
  3. The rotor speed and hence the rigidity of the gyros Correct answer.
  4. The static pressure supplied to the altimeter

Explanation

Air-driven gyros depend on suction from the vacuum pump to spin their rotors at the correct speed, and insufficient suction reduces rotor rpm, degrading rigidity and allowing the instruments to drift or topple. The gauge should therefore be checked in the pre-flight and monitored in flight.

Question 45Aircraft General Knowledge - Instruments

What is the purpose of the caging knob on an attitude indicator?

  1. To erect the gyro rapidly after start-up and prevent toppling during aerobatics Correct answer.
  2. To zero the slip indicator
  3. To disconnect the suction pump
  4. To lock the instrument so it can be used as a heading reference

Explanation

Caging physically locks the gyro in the correct reference position so that the erection mechanism can bring it upright quickly after start-up and so that the rotor is protected from tumbling during violent manoeuvres. The instrument must be uncaged before flight.

Question 46Aircraft General Knowledge - Instruments

During a prolonged coordinated turn, an attitude indicator with a pendulous vane erection system may show a small pitch error. Why?

  1. Static pressure changes with bank angle
  2. The erection mechanism senses apparent vertical, which is displaced in a turn Correct answer.
  3. The horizon bar is affected by magnetic variation
  4. The gyro rotor speed increases in a turn

Explanation

Pendulous erection devices align the gyro to the apparent vertical, which in a coordinated turn is tilted by the centrifugal force, so the instrument slowly precesses and shows a false climb or descent. The error is small and disappears after the turn ends.

Question 47Aircraft General Knowledge - Instruments

What is the source of the magnetic field measured by a remote-reading flux valve in a slaved heading system?

  1. The vertical component of the Earth's magnetic field sensed at the instrument panel
  2. The gyro spin axis orientation
  3. The horizontal component of the Earth's magnetic field sensed by a detector in the wing or tail Correct answer.
  4. The electrical output of the turn coordinator

Explanation

The flux valve is mounted remotely where disturbance from aircraft electrical currents is small, and it senses the horizontal component of the Earth's magnetic field to provide a reference that continuously slaves the heading gyro. This removes the need for the pilot to realign the gyro manually.

Question 48Aircraft General Knowledge - Instruments

What does the annunciator on a slaved heading system indicate when it shows a warning flag or the slave switch is set to free?

  1. The flux valve is supplying an accurate heading
  2. The system has automatically realigned to true north
  3. The turn indicator has failed
  4. The gyro is no longer being corrected by the magnetic reference and must be monitored manually Correct answer.

Explanation

When slaving is disengaged or the magnetic reference fails, the heading gyro operates in free gyro mode and drifts, so the pilot must periodically cross-check it with the standby compass. The warning flag exists precisely to alert the pilot to this loss of automatic correction.

Question 49Aircraft General Knowledge - Instruments

How does an electrical resistance-type fuel quantity gauge derive its indication?

  1. From the pressure of fuel at the tank outlet
  2. From a turbine flow meter in the fuel line
  3. From the capacitance change between tank plates
  4. From the change in resistance of a sender unit as a float moves with fuel level Correct answer.

Explanation

A float linked to a variable resistor changes the current in the indicator circuit as the fuel level rises or falls, producing the quantity indication. This simple system is common in light aircraft but is prone to errors when the aircraft is not in level flight.

Question 50Aircraft General Knowledge - Instruments

Why can a float-type fuel gauge give a false indication during a prolonged climb?

  1. The sender resistance falls with increasing altitude
  2. Fuel density increases in the climb
  3. The fuel surface moves to the rear of the tank, so the float no longer senses the true quantity Correct answer.
  4. The indicator is affected by the aircraft's electrical load

Explanation

In a climb the fuel settles toward the rear of the tank, so a float located elsewhere in the tank reads a level that does not represent the total quantity. This is why quantity indications are only reliable in level flight and why dipsticks or totalisers are used for verification.