100+ Free SLCAA ATC Knowledge Test Practice Questions

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Sample SLCAA ATC Knowledge Test Practice Questions

Try these sample questions to test your SLCAA ATC Knowledge Test exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to ICAO Annex 11 and SLCAR Part 1A, what is the primary objective of the Air Traffic Control (ATC) service?

A.To prevent collisions between aircraft and between aircraft and obstacles on the maneuvering area, and to expedite and maintain an orderly flow of air traffic

B.To monitor airline flight schedules and enforce ground handling punctuality

C.To provide weather forecasting and meteorological observations for all departing aircraft

D.To issue landing fees and administrative clearances for commercial operators

Explanation: ICAO Annex 11 (Air Traffic Services) Chapter 2 and SLCAR Part 1A specify that the primary objectives of ATS are to prevent collisions between aircraft, prevent collisions between aircraft on the maneuvering area and obstructions, and expedite and maintain an orderly flow of air traffic.

2Under ICAO Annex 2 rules governing airspace classification, which statement correctly describes VFR flight operations in Class A airspace?

A.VFR flights are permitted subject to continuous two-way radio communication

B.VFR flights are not permitted in Class A airspace

C.VFR flights are permitted provided flight visibility is at least 8 km

D.VFR flights are permitted only during daylight hours under Special VFR clearance

Explanation: In accordance with ICAO Annex 2 Appendix 4, Class A airspace is reserved exclusively for IFR flights; VFR flights (including Special VFR) are not permitted unless specifically authorized by state exemption.

3What is the standard minimum vertical separation applied between IFR aircraft below Flight Level 290 under standard ICAO ATS procedures?

A.500 feet (150 m)

B.1,000 feet (300 m)

C.1,500 feet (450 m)

D.2,000 feet (600 m)

Explanation: Under ICAO Doc 4444 (PANS-ATM) Chapter 5, the standard vertical separation minimum below FL 290 is 1,000 ft (300 m). Above FL 290 up to FL 410, 1,000 ft applies only in designated RVSM airspace.

4What standard atmospheric pressure value is set on an altimeter to display Flight Levels when operating above the Transition Altitude?

A.1000.0 hPa

B.1013.25 hPa (29.92 inHg)

C.1020.0 hPa (30.12 inHg)

D.992.0 hPa (29.29 inHg)

Explanation: Standard Altimeter Setting according to ICAO Annex 2 and Doc 8168 is 1013.25 hectopascals (hPa) or 29.92 inches of mercury (inHg). When set, aircraft vertical positions are expressed as Flight Levels.

5Under ICAO Annex 2, a surface of constant atmospheric pressure related to a specific pressure datum of 1013.25 hPa and separated by specific pressure intervals is defined as a:

A.Transition Height

B.Flight Level

C.Terrain Clearance Floor

D.True Altitude

Explanation: ICAO Annex 2 defines a Flight Level (FL) as a surface of constant atmospheric pressure related to a specific pressure datum of 1013.25 hPa and separated from other such surfaces by specific pressure intervals.

6What are the standard Visual Meteorological Conditions (VMC) visibility and cloud distance minima for VFR aircraft operating at or above 10,000 ft AMSL in Class C, D, and E airspace?

A.5 km flight visibility, 1,500 m horizontal and 1,000 ft vertical distance from cloud

B.8 km flight visibility, 1,500 m horizontal and 1,000 ft vertical distance from cloud

C.10 km flight visibility, 2 NM horizontal and 2,000 ft vertical distance from cloud

D.8 km flight visibility, clear of cloud and in sight of the surface

Explanation: ICAO Annex 2 Chapter 3 Table 3-1 specifies that at and above 10,000 ft AMSL (3,050 m) in Class C, D, E, F, G airspace, VMC minima are 8 km flight visibility and cloud distance of 1,500 m horizontally and 1,000 ft (300 m) vertically.

7According to ICAO Doc 4444 (PANS-ATM), how is 'Transition Altitude' defined?

A.The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes (QNH)

B.The lowest flight level available for use above the transition layer

C.The height above the aerodrome elevation at which altimeter setting must be changed from QFE to QNH

D.The altitude specified by ATC below which high-speed vectoring is prohibited

Explanation: Transition Altitude is defined in Doc 4444 as the altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes (using local QNH). Above the transition altitude, vertical position is expressed in Flight Levels (1013.25 hPa).

8When two power-driven heavier-than-air aircraft are converging at approximately the same level, which aircraft has the right-of-way under ICAO Annex 2 Rules of the Air?

A.The aircraft that has the other on its left

B.The aircraft that has the other on its right

C.The faster aircraft

D.The aircraft flying under an IFR flight plan

Explanation: ICAO Annex 2 Rule 3.2.2.4 (Right-of-way) states that when two aircraft are converging at approximately the same level, the aircraft that has the other on its right shall give way. Therefore, the aircraft that has the other on its left has the right-of-way.

9Which regulatory authority in Sierra Leone enforces compliance with SLCAR Part 1A and issues Air Traffic Controller licenses?

A.Sierra Leone Airports Authority (SLAA)

B.Sierra Leone Civil Aviation Authority (SLCAA)

C.Ministry of Transport and Aviation (MTA)

D.Roberts FIR Secretariat

Explanation: The Sierra Leone Civil Aviation Authority (SLCAA) is the statutory autonomous regulator established under the Civil Aviation Act of Sierra Leone to oversee safety, regulations (SLCARs), and ATC personnel licensing.

10According to ICAO Annex 11, which ATS units are responsible for providing Alerting Service?

A.Only Rescue Coordination Centres (RCC)

B.Flight Information Centres (FIC) and Air Traffic Control units (TWR, APP, ACC)

C.Only Area Control Centres (ACC)

D.Aerodrome Flight Information Service (AFIS) units exclusively

Explanation: ICAO Annex 11 Chapter 2 states that Alerting Service shall be provided by Flight Information Centres (FIC) and Air Traffic Control units (TWR, APP, ACC) to all aircraft provided with control or information services or having filed a flight plan.

About the SLCAA ATC Knowledge Test Exam

The Sierra Leone SLCAA Air Traffic Controller Knowledge Test is the official theoretical examination required for the issuance of an Air Traffic Controller Licence or Rating in Sierra Leone under SLCAR Part 1A and SLCAA-AC-PEL018.

Assessment

A single composite paper-based multiple-choice examination of 100 questions taken in one sitting. SLCAA-AC-PEL018 lists the Air Traffic Controller Licence subjects as Air Law, Air Traffic Control Equipment, General Knowledge, Human Performance, Language, Meteorology, Navigation and Operational Procedures, plus the rating-specific areas for the aerodrome control, approach control procedural and area control procedural ratings. SLCAA does not publish a percentage weighting for each subject.

Time Limit

Not published — advised at booking and by the invigilator

Passing Score

70% passing grade

Exam Fee

Examination fee payable at booking (not separately published); ATC Licence initial issuance USD 100 under the Schedule of Fees and Charges effective 1 January 2025 (Sierra Leone Civil Aviation Authority (SLCAA) Personnel Licensing Office)

SLCAA ATC Knowledge Test Exam Content Outline

25% of this practice bank

Air Law and ATC Procedures

SLCAR Part 1A regulations, ICAO Annex 2 & 11, ICAO Doc 4444 (PANS-ATM), airspace classifications (A-G), VFR/IFR rules, altimetry procedures, and ATS unit duties.

30% of this practice bank

Air Traffic Control Operations

Aerodrome control, approach control, area control, radar and non-radar separation standards (vertical, lateral, longitudinal), wake turbulence spacing, and transfer of control.

15% of this practice bank

Navigation and Altimetry

Aeronautical charts, ground and space-based navigation aids (VOR, NDB, DME, ILS, GNSS), magnetic variation, QNH/QFE procedures, transition level, and flight levels.

15% of this practice bank

Aviation Meteorology

International Standard Atmosphere (ISA), atmospheric pressure systems, wind shear, microbursts, cloud classification, METAR/SPECI/TAF decoding, and SIGMET interpretation.

15% of this practice bank

Human Performance and Emergencies

Human factors in ATC situational awareness, stress and fatigue management, radiotelephony failure, emergency phraseology (MAYDAY/PAN PAN), and SAR alerting phases.

How to Pass the SLCAA ATC Knowledge Test Exam

What You Need to Know

Passing score: 70% passing grade
Assessment: A single composite paper-based multiple-choice examination of 100 questions taken in one sitting. SLCAA-AC-PEL018 lists the Air Traffic Controller Licence subjects as Air Law, Air Traffic Control Equipment, General Knowledge, Human Performance, Language, Meteorology, Navigation and Operational Procedures, plus the rating-specific areas for the aerodrome control, approach control procedural and area control procedural ratings. SLCAA does not publish a percentage weighting for each subject.
Time limit: Not published — advised at booking and by the invigilator
Exam fee: Examination fee payable at booking (not separately published); ATC Licence initial issuance USD 100 under the Schedule of Fees and Charges effective 1 January 2025

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

SLCAA ATC Knowledge Test Study Tips from Top Performers

1Master ICAO Doc 4444 separation minima including wake turbulence longitudinal separation, radar vectoring minima, and vertical separation standards (1,000 ft below FL290 and RVSM).

2Thoroughly review SLCAR Part 1A licensing requirements and airspace classifications applicable within the Roberts FIR / Freetown Lungi TMA.

3Practice decoding METAR/TAF weather reports and calculating pressure altitude, density altitude, and wind drift corrections.

Frequently Asked Questions

What is the pass mark for the SLCAA ATC Knowledge Test?

Candidates must obtain not less than 70% of the possible marks. SLCAA-AC-PEL018 requires the licence examination to be taken as a single sitting covering all applicable subjects.

Does SLCAA publish how long the examination lasts, or how the marks are split between subjects?

No. SLCAA-AC-PEL018 states that the time allowed for each examination is given to the applicant at booking and again by the invigilator before the paper starts, and the Authority publishes the subject list without percentage weightings. The percentages shown on this page describe how our free practice bank is distributed, not the official paper.

How long are SLCAA ATC Knowledge Test results valid?

Each knowledge test result is valid for 24 calendar months, as stated in SLCAA-AC-PEL018 and SLCAR Part 1A.

Where is the SLCAA examination conducted, and in what language?

Written examinations are conducted by the SLCAA Personnel Licensing (PEL) Office, usually at the SLCAA examination hall at the Lungi office. English is Sierra Leone's official language and SLCAR Part 1A requires demonstrated English language proficiency for the licence, so the examination is sat in English.

What happens if a candidate fails the ATC exam?

A candidate who fails the knowledge test is allowed to re-sit a maximum of two times. A further retake is permitted only on presenting evidence of additional instruction from an authorised instructor or refresher training at an Approved Training Organisation.

Who is eligible to apply for a Sierra Leone Air Traffic Controller Licence?

Under SLCAR Part 1A the applicant must be at least 21 years of age, hold a Class 3 medical certificate, complete an approved training course, hold an authorised instructor's endorsement for the knowledge test, and demonstrate the required competence under a supervising on-the-job training instructor.