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GCAA CAR-66 B1 Exam study materials
GCAA CAR-66 B1 Exam study resources

GCAA CAR-66 B1 Exam practice questions

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Question 1Aviation Legislation

Under the GCAA civil aviation regulations, which document establishes the requirements for the issue of aircraft maintenance licences and the privileges of the licence holder?

  1. CAR-21
  2. CAR-145
  3. CAR-66 Correct answer.
  4. CAR-M

Explanation

CAR-66 sets out the requirements for the certification of maintenance staff, including licence categories, knowledge and experience requirements, and the certification privileges attached to each licence category. The other Parts deal with approved maintenance organisations, continuing airworthiness management and design/production respectively.

Question 2Aviation Legislation

A B1 licence holder is permitted to issue a certificate of release to service after maintenance on an aircraft. Which statement describes the scope of a B1 licence?

  1. Avionics systems only, including line-replaceable unit testing
  2. Only structural repairs and airframe inspections
  3. Mechanical, structural and electrical systems, with limited avionics replacement tasks Correct answer.
  4. All systems without restriction, including avionics and structural repair

Explanation

The B1 category covers airframe, engine and mechanical/electrical systems, and permits the certification of simple avionics replacements when the licence carries the relevant system rating. Full avionics certification and complex avionics testing belong to the B2 category.

Question 3Aviation Legislation

What is the standard validity period of a GCAA aircraft maintenance licence, subject to the holder remaining qualified and the licence not being suspended or revoked?

  1. 5 years from date of issue
  2. Unlimited, subject to continued compliance Correct answer.
  3. 10 years from date of issue
  4. 2 years from date of issue

Explanation

Aircraft maintenance licences are issued without a fixed expiry; they remain valid provided the holder continues to meet the applicable requirements, including recency and continuation training. Validity can be affected by suspension, revocation or failure to maintain currency.

Question 4Aviation Legislation

Which regulation governs the approval and continued airworthiness of maintenance organisations performing maintenance on aircraft registered in the UAE?

  1. CAR-145 Correct answer.
  2. CAR-21
  3. CAR-39
  4. CAR-66

Explanation

CAR-145 prescribes the requirements for organisations seeking approval to carry out maintenance, including quality systems, personnel, facilities and records. CAR-66 deals with personnel licensing and CAR-21 with design and production.

Question 5Aviation Legislation

An aircraft operator wishes to change the maintenance programme for a UAE-registered aircraft. Which document and approval route applies?

  1. The maintenance programme is approved by the pilot in command
  2. The maintenance programme must be approved by the GCAA or by an organisation approved under CAR-M with indirect approval privileges Correct answer.
  3. The maintenance programme requires no approval if it meets the manufacturer's manual
  4. The maintenance programme is approved automatically once submitted to the manufacturer

Explanation

Maintenance programmes for UAE-registered aircraft require approval by the competent authority, or may be indirectly approved by a CAR-M approved continuing airworthiness management organisation where that privilege has been granted. The manufacturer does not approve operator programmes.

Question 6Aviation Legislation

Which of the following is a continuing airworthiness management task performed under CAR-M?

  1. Performing the annual structural inspection on the aircraft
  2. Developing and controlling the aircraft maintenance programme Correct answer.
  3. Issuing the certificate of airworthiness
  4. Certifying the release to service after defect rectification

Explanation

Continuing airworthiness management includes developing and controlling the maintenance programme, managing defects and AD compliance, and maintaining airworthiness records. Physical maintenance tasks and release to service are performed by maintenance organisations and certifying staff.

Question 7Aviation Legislation

An airworthiness directive is issued for a type of aircraft operated in the UAE. What is the operator's obligation?

  1. Comply only if the manufacturer recommends it
  2. Comply within the specified time unless an alternative means of compliance is approved Correct answer.
  3. Comply only if the aircraft is operated commercially
  4. Comply only after the next scheduled C-check

Explanation

Airworthiness directives are mandatory and must be complied with within the stated compliance time. Alternative means of compliance may only be used when approved by the issuing authority.

Question 8Aviation Legislation

What is the purpose of a certificate of release to service (CRS)?

  1. To certify that the aircraft is fit for the intended flight following maintenance Correct answer.
  2. To certify that the aircraft has completed its annual check
  3. To certify that the aircraft has been sold to a new owner
  4. To certify that the aircraft is insured for the flight

Explanation

The CRS confirms that the maintenance has been carried out in accordance with the applicable requirements and that the aircraft or component is fit for return to service. It is issued by authorised certifying staff after satisfactory completion of the work.

Question 9Aviation Legislation

Which of the following records must be retained by a CAR-145 maintenance organisation?

  1. Maintenance records for the periods specified by the regulation, including details of work and certifying staff Correct answer.
  2. Only financial records relating to maintenance invoicing
  3. Only records requested by the aircraft owner
  4. Only records of work performed in the last 30 days

Explanation

CAR-145 requires maintenance organisations to retain detailed maintenance records for defined periods, including the work performed, the certifying staff and any approved data used. These records support traceability and continuing airworthiness.

Question 10Aviation Legislation

A certifying staff member has not exercised certification privileges on the relevant aircraft type for an extended period. What requirement applies before privileges can be exercised again?

  1. A new type rating examination must be passed
  2. The aircraft must undergo a full repaint
  3. The licence must be reissued by the GCAA
  4. Recent experience requirements on the type must be satisfied Correct answer.

Explanation

Certifying staff must maintain recent experience on the relevant aircraft type to exercise certification privileges. Where recency has lapsed, the holder must regain it in accordance with the applicable requirements before certifying.

Question 11Aviation Legislation

Under the GCAA framework, who is responsible for ensuring that an aircraft is maintained in accordance with the approved maintenance programme?

  1. The aircraft owner or operator, through the continuing airworthiness management organisation Correct answer.
  2. The aircraft manufacturer
  3. The maintenance organisation alone
  4. The air traffic service provider

Explanation

The operator or owner is ultimately responsible for continuing airworthiness, usually discharged through a CAR-M approved continuing airworthiness management organisation. The maintenance organisation performs the work but does not own that responsibility.

Question 12Aviation Legislation

Which of the following best describes the role of a CAR-145 quality system?

  1. To approve the aircraft type certificate
  2. To set the commercial pricing of maintenance work
  3. To monitor compliance with the approved procedures and ensure continued airworthiness standards Correct answer.
  4. To issue pilot licences

Explanation

A quality system under CAR-145 provides independent monitoring of the organisation's compliance with procedures and regulatory requirements, including audits and follow-up of findings. It supports safe and compliant maintenance.

Question 13Aviation Legislation

What is the purpose of a maintenance check flight in the context of maintenance certification?

  1. To satisfy insurance requirements for the operator
  2. To verify that the aircraft operates correctly after maintenance before return to service Correct answer.
  3. To train new pilots on the aircraft type
  4. To reposition the aircraft for commercial scheduling

Explanation

A maintenance check flight may be required to verify correct functioning of systems after maintenance before the aircraft is returned to service. The flight is conducted in accordance with approved procedures and the results are recorded.

Question 14Aviation Legislation

Which document would a certifying staff member consult to determine the approved methods for performing a specific repair on an aircraft structure?

  1. The aircraft flight manual performance section
  2. The airport's ground handling manual
  3. The operator's commercial timetable
  4. The approved maintenance data specified by the design approval holder Correct answer.

Explanation

Approved maintenance data, such as the structural repair manual or other data approved by the design authority, provides the methods and limits for repairs. Certifying staff must use approved data when performing and certifying maintenance.

Question 15Aviation Legislation

What is the significance of a finding raised during a CAR-145 audit?

  1. It is a commercial dispute between the organisation and its customer
  2. It identifies a non-compliance that must be corrected within an agreed timescale Correct answer.
  3. It is an optional recommendation with no follow-up
  4. It automatically suspends the organisation's approval

Explanation

Findings identify non-compliances or deficiencies that the organisation must address, usually within an agreed corrective action period. Serious findings may lead to further regulatory action, but a finding itself is not an automatic suspension.

Question 16Aviation Legislation

Which of the following is a requirement for the issue of a B1.1 licence under CAR-66?

  1. Ownership of an approved maintenance organisation
  2. Completion of the required basic training, examinations and practical experience on the relevant category Correct answer.
  3. Holding a commercial pilot licence
  4. Completion of a flight simulator session

Explanation

CAR-66 requires applicants to complete the prescribed basic knowledge training and examinations and to demonstrate the required practical maintenance experience for the category sought. Other qualifications do not substitute for these requirements.

Question 17Aviation Legislation

Under what circumstances may an aircraft be released to service with a deferred defect?

  1. When the pilot considers the defect minor
  2. When the defect is covered by an approved minimum equipment list or configuration deviation list Correct answer.
  3. When the operator's commercial schedule requires it
  4. When the defect is deferred indefinitely

Explanation

Deferred defects are permitted only where an approved MEL or CDL allows operation with the item inoperative, subject to any specified conditions and limitations. The decision cannot be made on commercial or subjective grounds.

Question 18Aviation Legislation

Which of the following describes the function of the GCAA in relation to civil aviation in the UAE?

  1. It is the national aviation authority responsible for regulation, oversight and licensing Correct answer.
  2. It is an international air traffic control provider
  3. It is a commercial airline operator
  4. It is an aircraft manufacturer

Explanation

The GCAA is the UAE's civil aviation authority, responsible for regulating aviation safety, issuing licences and approvals, and providing oversight of the aviation industry. It does not operate aircraft or manufacture them.

Question 19Aviation Legislation

A maintenance organisation wishes to use a new piece of test equipment not listed in its approved procedures. What action is required before it can be used for certification purposes?

  1. The equipment may be used only for non-certifying tasks indefinitely
  2. The equipment must be calibrated and its use incorporated into the organisation's approved procedures Correct answer.
  3. The equipment may be used immediately without further action
  4. The equipment may be used if the technician considers it suitable

Explanation

Test equipment used for maintenance and certification must be calibrated and controlled under the organisation's approved procedures. Introducing new equipment requires updating those procedures and ensuring traceable calibration.

Question 20Human Factors

Under human factors principles, the 'dirty dozen' refers to a set of human error precursors. Which of the following is one of the dirty dozen?

  1. Turbulence
  2. Corrosion
  3. Fatigue life
  4. Complacency Correct answer.

Explanation

The dirty dozen is a set of twelve human factors precursors to maintenance error, including complacency, fatigue, distraction, pressure, and lack of communication. Turbulence, corrosion, and fatigue life are physical or operational concepts, not human error precursors.

Question 21Human Factors

In maintenance human factors, what does the term 'situational awareness' describe?

  1. The ability to recall maintenance manual procedures
  2. The physical fitness level required to perform a task
  3. The calibration status of test equipment
  4. The perception and understanding of what is happening around you at a given moment Correct answer.

Explanation

Situational awareness is the accurate perception of the current environment combined with understanding of what that information means for the task. Loss of situational awareness is a common contributor to maintenance errors.

Question 22Human Factors

A technician working a night shift after only three hours of sleep is most at risk from which human factor?

  1. Complacency
  2. Fatigue Correct answer.
  3. Distraction
  4. Peer pressure

Explanation

Fatigue results from insufficient sleep, extended duty periods, or circadian disruption such as night work. It degrades attention, reaction time, and decision-making, making it the dominant risk in this scenario.

Question 23Human Factors

Which communication practice best reduces the risk of error during a shift handover?

  1. Relying on memory to summarise the shift verbally
  2. Leaving notes in a personal notebook for the next shift
  3. Using a structured written and verbal handover covering open tasks and defects Correct answer.
  4. Handing over only when the incoming person asks questions

Explanation

Effective handovers use a structured format that transfers task status, outstanding defects, and any limitations verbally and in writing. This ensures continuity and reduces assumptions or omissions.

Question 24Human Factors

In the 'Swiss cheese' model of accident causation, what do the holes in the slices represent?

  1. The number of staff on shift
  2. Individual latent and active failures that can align to allow an accident Correct answer.
  3. Scheduled maintenance intervals
  4. The physical gaps between aircraft panels

Explanation

The model depicts defences as slices of cheese with holes representing weaknesses, both latent conditions and active failures. When holes align across layers, a hazard can pass through all defences and cause harm.

Question 25Human Factors

Which of the following is an example of an active failure in aircraft maintenance?

  1. Inadequate training policy
  2. A technician installing a component incorrectly Correct answer.
  3. A poorly written company procedure
  4. A management decision to reduce spares stock

Explanation

Active failures are unsafe acts by front-line personnel with immediate consequences, such as an incorrect installation. Latent failures are organisational conditions that lie dormant until triggered.

Question 26Human Factors

A maintenance team is under schedule pressure to release an aircraft. According to human factors guidance, what is the most appropriate action for the certifying staff?

  1. Skip the functional test because the component is new
  2. Sign off the task to avoid delaying the flight
  3. Delegate the sign-off to an unqualified colleague
  4. Follow the approved procedures and record any limitations honestly Correct answer.

Explanation

Pressure is a recognised error precursor, and the correct defence is to adhere to approved data and record the true status of the aircraft. Accepting shortcuts to meet schedule undermines airworthiness.

Question 27Human Factors

Which statement best describes the purpose of a 'stop and think' or self-check before a critical maintenance task?

  1. It replaces the need for independent inspection
  2. It documents the technician's hourly rate
  3. It satisfies the aircraft dispatch requirement
  4. It provides a deliberate pause to confirm the task, resources, and understanding before proceeding Correct answer.

Explanation

A deliberate pause allows the technician to verify that the correct task, documentation, tools, and understanding are in place. It is a personal error-management technique, not a substitute for inspection systems.

Question 28Human Factors

An engineer is distracted mid-task by a phone call and later cannot remember whether a fastener was torqued. What is the most appropriate human factors response?

  1. Ask a colleague to confirm from memory
  2. Verify the torque value and record the result before continuing Correct answer.
  3. Continue and check it at the next scheduled inspection
  4. Assume it was torqued because the task was nearly complete

Explanation

When memory is unreliable after an interruption, the correct action is to re-verify the actual condition and record it. This restores certainty and provides a traceable record.

Question 29Human Factors

In human factors terminology, what is 'assertiveness' in the context of a maintenance team?

  1. The willingness to speak up when something appears wrong Correct answer.
  2. The habit of accepting instructions without question
  3. The tendency to dominate team discussions
  4. The ability to work alone without supervision

Explanation

Assertiveness is the willingness to voice concerns and challenge unsafe actions respectfully. It supports a safety culture by ensuring doubts are raised before errors propagate.

Question 30Human Factors

Which of the following best reduces the risk of a 'look-alike' component being fitted incorrectly?

  1. Asking the stores clerk to confirm from memory
  2. Physically comparing the part to the illustrated parts catalogue and checking markings on the part itself Correct answer.
  3. Relying on the part number printed on the packaging
  4. Fitting whichever part is closest to hand

Explanation

Look-alike parts require positive identification using markings on the component and reference to approved documentation such as the illustrated parts catalogue. Packaging alone can be misleading.

Question 31Human Factors

A technician is asked to work on a type they have not been trained on. What does human factors guidance indicate as the primary concern?

  1. The technician's currency on unrelated types
  2. The competence and authorisation required for the specific task Correct answer.
  3. The availability of overtime pay
  4. The colour coding of the tooling

Explanation

Competence and authorisation are prerequisites for any maintenance task; working outside one's training increases error risk. Currency on unrelated types does not qualify a person for the new task.

Question 32Human Factors

Which of the following is the best example of an error-trapping technique during maintenance?

  1. Using a checklist and signing each step as it is completed Correct answer.
  2. Skipping steps that are usually straightforward
  3. Relying on a colleague to notice mistakes later
  4. Working faster to reduce exposure time

Explanation

Error-trapping techniques catch errors before they propagate, and step-by-step checklists with sign-off provide a positive record of completion. They create a barrier at each stage of the task.

Question 33Human Factors

According to human factors models, why is 'violation' distinguished from 'error'?

  1. Violations involve a deliberate deviation from procedures, whereas errors are unintended Correct answer.
  2. Violations are always unintentional
  3. Violations only occur in management
  4. Errors are always more serious than violations

Explanation

Errors are unintended deviations from intention or correct action, while violations are deliberate departures from rules or procedures. The distinction matters because corrective actions differ.

Question 34Human Factors

A maintenance organisation introduces a confidential reporting system for errors. Which outcome is most consistent with human factors best practice?

  1. Guaranteed immunity from regulatory action for all reports
  2. Elimination of the need for supervision
  3. Reduction in the number of procedures required
  4. Increased identification of latent conditions before accidents occur Correct answer.

Explanation

Confidential reporting encourages disclosure of errors and near-misses, revealing latent conditions that can be corrected proactively. It supports a just culture without removing supervision or procedural controls.

Question 35Human Factors

During a repetitive task, a technician begins to skip a verification step because 'it never fails'. Which human factor is most clearly demonstrated?

  1. Noise exposure
  2. Dehydration
  3. Complacency Correct answer.
  4. Hypoxia

Explanation

Complacency is a state of overconfidence arising from routine or repeated success, leading to skipped checks. The other options are physiological or environmental stressors not described here.

Question 36Human Factors

A shift team discovers that a work card was signed off but the corresponding inspection was not performed. Which analysis best reflects a human factors approach to preventing recurrence?

  1. Discipline the individual and take no further action
  2. Increase the number of tasks assigned per shift
  3. Remove the sign-off requirement from the work card
  4. Investigate the task design, workload, and supervision that allowed the discrepancy, then correct the system Correct answer.

Explanation

A human factors approach looks beyond the individual to the systemic conditions such as task design, workload, and supervision that contributed to the failure. Correcting those conditions prevents recurrence.

Question 37Human Factors

Which combination of factors most strongly increases the likelihood of a maintenance error according to human factors research?

  1. Good lighting, adequate rest, and clear procedures
  2. Standard tooling, familiar task, and daytime work
  3. Written procedures, supervision, and adequate staffing
  4. Time pressure, fatigue, and poor communication Correct answer.

Explanation

Error likelihood rises when stressors such as time pressure and fatigue combine with communication weaknesses. These conditions interact to degrade performance and reduce detection of mistakes.

Question 38Human Factors

An organisation finds that most errors occur at the end of long shifts during complex tasks. Which intervention is most aligned with human factors principles?

  1. Requiring technicians to work longer to build endurance
  2. Increasing the complexity of tasks to maintain alertness
  3. Scheduling complex tasks earlier in the shift and managing duty limits Correct answer.
  4. Removing the requirement for task verification at shift end

Explanation

Matching task demand to alertness levels and controlling duty periods addresses the fatigue mechanism behind the error pattern. Complex work is best scheduled when alertness is higher.

Question 39Air Law and Regulatory Framework

Under the GCAA civil aviation regulations, which document issued to an approved maintenance organisation defines the scope of work it is permitted to perform?

  1. The organisation's quality manual only
  2. The organisation's approval certificate with its associated capability list Correct answer.
  3. The organisation's maintenance procedures manual only
  4. The organisation's training syllabus

Explanation

An approved maintenance organisation receives an approval certificate that states the ratings and, where applicable, a capability list defining the precise products and tasks it may maintain. The procedures manual describes how work is controlled but does not by itself grant the scope of approval.

Question 40Air Law and Regulatory Framework

What is the primary purpose of a maintenance organisation exposition or procedures manual required under CAR-66/CAR-145 arrangements?

  1. To specify how the organisation complies with the applicable requirements Correct answer.
  2. To list the aircraft the organisation has previously worked on
  3. To record the personal licences of all certifying staff
  4. To document the financial arrangements of the organisation

Explanation

The exposition or procedures manual is the document by which the organisation shows how it meets the regulatory requirements and how its procedures achieve compliance. It is a controlled document subject to approval or acceptance by the competent authority.

Question 41Air Law and Regulatory Framework

A certifying engineer is asked to release an aircraft to service after maintenance. Which condition must be satisfied before a certificate of release to service is issued?

  1. The aircraft owner has paid the maintenance invoice
  2. The next scheduled check has already been booked
  3. The aircraft has flown within the previous 24 hours
  4. All maintenance has been completed and the aircraft is in a condition for safe operation Correct answer.

Explanation

A certificate of release to service confirms that the required maintenance has been carried out and that the aircraft is airworthy and safe to operate. It is a technical declaration, independent of commercial or scheduling considerations.

Question 42Air Law and Regulatory Framework

In the context of aircraft maintenance, what does the term 'airworthiness' primarily describe?

  1. The number of hours the aircraft has flown since new
  2. The nationality of the aircraft's operator
  3. The condition of the aircraft and its components such that it conforms to its approved type design and is safe to operate Correct answer.
  4. The commercial value of the aircraft on the market

Explanation

Airworthiness concerns whether the aircraft conforms to its approved type design and is in a condition for safe operation. It is maintained through continuing airworthiness requirements, inspections and approved maintenance.

Question 43Air Law and Regulatory Framework

Which of the following best describes the role of the GCAA as the national aviation authority in the United Arab Emirates?

  1. It represents airlines in commercial negotiations
  2. It operates commercial air transport services on behalf of the state
  3. It manufactures aircraft components for the local market
  4. It issues regulations, approvals and licences and provides safety oversight of civil aviation Correct answer.

Explanation

A national civil aviation authority issues and enforces regulations, grants approvals and licences, and conducts oversight to ensure safety and compliance. It does not itself operate air services or engage in manufacturing.

Question 44Air Law and Regulatory Framework

An aircraft operated under an approved maintenance programme reaches a scheduled inspection interval. What action is required to remain compliant?

  1. The inspection may be postponed until the next annual check regardless of interval
  2. The inspection must be accomplished within the tolerances permitted by the approved maintenance programme Correct answer.
  3. The inspection may be replaced by a visual walk-around by the pilot
  4. The inspection may be deferred indefinitely if the aircraft is not flying

Explanation

The approved maintenance programme sets intervals and any permitted tolerances for accomplishing scheduled tasks. Tasks must be performed within those limits to maintain continuing airworthiness.

Question 45Air Law and Regulatory Framework

A maintenance task is classified as a 'critical task' in the maintenance review board report. What does this classification imply?

  1. The task is only advisory and carries no mandatory status
  2. The task must be accomplished as specified to ensure effective control of a failure that could affect safety Correct answer.
  3. The task must be performed by the operator's chief engineer personally
  4. The task can be omitted if the aircraft is operated only on short flights

Explanation

Critical tasks are those whose omission or incorrect accomplishment could lead to a hazardous or catastrophic failure condition. They must therefore be performed exactly as specified and are typically subject to independent inspection.

Question 46Air Law and Regulatory Framework

Which statement correctly describes the relationship between a type certificate and an aircraft's continuing airworthiness?

  1. A type certificate is issued to each individual aircraft rather than to a design
  2. A type certificate replaces the need for a certificate of airworthiness
  3. A type certificate defines the approved design, and continuing airworthiness ensures the aircraft remains in conformity with that design throughout its life Correct answer.
  4. A type certificate removes the need for any further maintenance after delivery

Explanation

The type certificate approves the design of a product, while continuing airworthiness measures ensure each aircraft continues to conform to that approved design. Both elements are necessary for lawful operation.

Question 47Air Law and Regulatory Framework

An operator wishes to extend a maintenance interval beyond the value published in the maintenance planning document. What is the correct regulatory approach?

  1. Apply the extension directly, since the planning document is only guidance
  2. Seek approval through the competent authority using the established variation or escalation process Correct answer.
  3. Record the extension in the technical log without further action
  4. Extend the interval only if the aircraft is based outside the UAE

Explanation

Interval extensions require justification and formal approval through the authority's variation or escalation procedure. The maintenance planning document is not itself an approval to exceed published limits.

Question 48Air Law and Regulatory Framework

Under the continuing airworthiness requirements, who is ultimately responsible for ensuring that an aircraft is maintained in an airworthy condition?

  1. The pilot flying the next sector
  2. The line maintenance contractor alone
  3. The component overhaul workshop
  4. The registered owner or the operator holding continuing airworthiness responsibility Correct answer.

Explanation

Continuing airworthiness responsibility rests with the registered owner or the organisation contracted to manage it. Maintenance organisations perform tasks, but the overall responsibility for the aircraft's airworthy condition remains with that responsible person or entity.

Question 49Air Law and Regulatory Framework

A maintenance organisation discovers that a component it fitted does not conform to the approved data. Which action is most consistent with regulatory requirements?

  1. Downgrade the discrepancy to an observation in the technical log
  2. Return the component to stores without documentation
  3. Continue operation and note the discrepancy at the next heavy check
  4. Quarantine the component, record the non-conformity and take corrective action through the quality system Correct answer.

Explanation

Non-conforming components must be controlled to prevent unintended use, and the non-conformity must be recorded and corrected through the organisation's quality system. This supports traceability and safety.

Question 50Air Law and Regulatory Framework

What is the purpose of an airworthiness directive issued by a state of design and adopted by the GCAA?

  1. To recommend optional improvements to aircraft comfort
  2. To describe the aircraft's commercial performance
  3. To set the price of spare parts
  4. To mandate corrective action to address an unsafe condition in aircraft, engines or components Correct answer.

Explanation

An airworthiness directive is a mandatory document requiring action to correct an unsafe condition. Once adopted, compliance is obligatory within the stated timeframe for affected aircraft.