Free Practice Questions for Iran CAO ATCO Theory

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Sample Iran CAO ATCO Theory Practice Questions

Try these sample questions to review concepts for the Iran CAO ATCO Theory exam. 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, which of the following represents the primary objectives of Air Traffic Services (ATS)?

A.Preventing collisions between aircraft, preventing collisions on the maneuvering area between aircraft and obstructions, and expediting and maintaining an orderly flow of air traffic

B.Maximizing airline operating profits, calculating national navigation tariff charges, and regulating commercial pilot flight duty hours

C.Enforcing military airspace sovereignty, conducting border customs surveillance, and licensing civil aircraft maintenance engineers

D.Providing continuous airborne flight telemetry monitoring, issuing scheduled aircraft maintenance work orders, and managing airport commercial passenger gates

Explanation: ICAO Annex 11 (Air Traffic Services) Chapter 2 clearly defines the core objectives of ATS: to prevent collisions between aircraft in flight, prevent collisions between aircraft on the maneuvering area and between aircraft and obstructions on that area, expedite and maintain an orderly flow of air traffic, provide advice and information useful for the safe and efficient conduct of flights, and notify appropriate organizations regarding aircraft in need of search and rescue aid.

2In Class A airspace as categorized by ICAO Annex 11, which types of flights are permitted and what separation is provided?

A.IFR flights only; all flights are provided with air traffic control service and are separated from each other

B.Both IFR and VFR flights; separation is provided between IFR flights only

C.Both IFR and VFR flights; separation is provided between all participating aircraft

D.VFR flights only upon receiving a special visual corridor clearance from the area control centre

Explanation: Under the ICAO airspace classification system in Annex 11, Class A airspace is the most restrictive category: only IFR flights are permitted, all flights are subject to air traffic control service, and positive separation is provided between all aircraft. VFR flights are strictly prohibited unless specifically authorized under exceptional state exemptions.

3In Class C controlled airspace, what separation service is an air traffic controller obligated to provide to participating flights under ICAO Annex 11?

A.Separation between IFR flights, and separation between IFR and VFR flights; VFR flights receive traffic information regarding other VFR flights

B.Separation between all flights (IFR from IFR, IFR from VFR, and VFR from VFR)

C.Separation between IFR flights only; VFR flights receive no traffic information or separation whatsoever

D.Separation between VFR flights only, while IFR flights are required to maintain self-separation visually

Explanation: In Class C airspace, air traffic control service is provided to all flights. Controllers must provide separation between IFR flights and between IFR flights and VFR flights. Between VFR flights, separation is not provided; instead, controllers provide traffic information in respect of other VFR flights and traffic avoidance advice upon request.

4Which air traffic services are provided to civil flights operating within Class G airspace under standard ICAO provisions?

A.Flight Information Service and Alerting Service upon request or availability

B.Full Air Traffic Control Service including standard radar separation

C.Air Traffic Advisory Service with mandatory compliance with vector instructions

D.Positive radar separation between all IFR flights and tactical speed control

Explanation: Class G airspace is uncontrolled airspace. In Class G, air traffic control service is not provided. IFR and VFR flights receive Flight Information Service (FIS) to provide pertinent navigational, weather, and hazard information, along with Alerting Service to initiate search and rescue when required.

5Under ICAO Annex 2 (Rules of the Air), what is the legal relationship between an ATC clearance and the authority of the Pilot-in-Command (PIC)?

A.The PIC has ultimate authority for the safety of the aircraft and may deviate from an ATC clearance in an emergency to avert immediate danger

B.An ATC clearance is absolute and criminalizes any deviation even if adhering to it would result in imminent ground collision

C.The controller bears sole legal responsibility for terrain clearance once an IFR flight plan is activated

D.The PIC must obtain written prior permission from the civil aviation authority before deviating from an ATC clearance under any circumstance

Explanation: ICAO Annex 2 Section 2.4 establishes that the Pilot-in-Command of an aircraft shall have final authority as to the disposition of the aircraft while in command. While pilots must adhere to ATC clearances under normal conditions, the PIC has the ultimate authority and responsibility to deviate from a clearance in an emergency situation when immediate safety requires it.

6According to ICAO Annex 11, Air Traffic Control (ATC) service is divided into three distinct specialized services. What are they?

A.Area control service, approach control service, and aerodrome control service

B.Flight information service, alerting service, and advisory service

C.Radar surveillance service, ADS-B broadcast service, and multilateration tracking service

D.En-route traffic service, meteorological observation service, and aeronautical information service

Explanation: ICAO Annex 11 Paragraph 2.3.1 states that Air Traffic Control service shall be provided by: (a) Area control service (by an Area Control Centre - ACC), (b) Approach control service (by an Approach Control Unit - APP), and (c) Aerodrome control service (by an Aerodrome Control Tower - TWR).

7Under ICAO Annex 2, what are the minimum meteorological conditions required for an air traffic controller to authorize a Special VFR flight within a Control Zone (CTR)?

A.Ground visibility of not less than 1,500 m and ceiling of not less than 600 m (2,000 ft) or 450 m (1,500 ft) per state regulations, clear of clouds and in sight of the surface

B.Flight visibility of not less than 800 m with no requirement for ceiling or surface visual reference

C.Ground visibility of not less than 5 km and ceiling of not less than 3,000 ft with standard VFR cloud separation

D.Zero visibility permitted as long as the aircraft is equipped with a functioning autopilot and SSR transponder

Explanation: Special VFR flights may be authorized to operate within a control zone when meteorological conditions are below VMC. Under ICAO Annex 2 rules, SVFR flights may be cleared provided the ground visibility is not less than 1,500 m (or 800 m for helicopters), ceiling is not less than 450 m (1,500 ft) or as prescribed by the competent authority, and the aircraft operates clear of clouds and with the surface in sight at a speed of 140 kt IAS or less.

8In the Tehran Flight Information Region (OIIX FIR), how is the upper controlled airspace along ATS routes predominantly classified under Iranian civil aviation regulations?

A.Class A, requiring all flights to be conducted under IFR with mandatory ATC separation

B.Class G, allowing uncontrolled flight without continuous two-way radio communication

C.Class E, permitting uncoordinated VFR operations without transponder equipment

D.Class F, designated exclusively for advisory military transport exercises

Explanation: In the Tehran FIR, the upper control area (UTA/CTA) along established international and domestic airway structures is designated as Class A controlled airspace. Within this airspace, all flights must be conducted under Instrument Flight Rules (IFR), are subject to air traffic control clearances, and are separated from one another by Tehran Area Control Centre (ACC).

9Under the standard ICAO semi-circular cruising level system (ICAO Annex 2, Appendix 3), which cruising levels apply to an IFR flight tracking a magnetic course of 085° in standard airspace?

A.Odd Flight Levels (e.g., FL 290, FL 310, FL 330, FL 350)

B.Even Flight Levels (e.g., FL 280, FL 300, FL 320, FL 340)

C.Any Flight Level ending in 50 (e.g., FL 295, FL 315, FL 335)

D.Random flight levels assigned regardless of magnetic track

Explanation: Under the standard semi-circular system adopted by ICAO and used in the Tehran FIR, flights maintaining a magnetic track between 000° and 179° (Eastbound) cruise at ODD flight levels under IFR. Flights maintaining a magnetic track between 180° and 359° (Westbound) cruise at EVEN flight levels.

10Within Reduced Vertical Separation Minimum (RVSM) airspace in the Tehran FIR, what are the vertical limits and the standard vertical separation applied between approved aircraft?

A.Between FL 290 and FL 410 inclusive, with 1,000 ft (300 m) vertical separation

B.Between FL 150 and FL 250 inclusive, with 500 ft (150 m) vertical separation

C.Between FL 200 and FL 300 inclusive, with 2,000 ft (600 m) vertical separation

D.Above FL 410 exclusively, with 1,000 ft (300 m) vertical separation

Explanation: RVSM airspace is globally standardized under ICAO provisions and implemented in the Tehran FIR between FL 290 and FL 410 inclusive. Within this vertical band, vertical separation between approved aircraft is reduced from the conventional 2,000 ft down to 1,000 ft (300 m), substantially increasing airspace capacity.

About the Iran CAO ATCO Theory Exam

The Civil Aviation Organization of Iran (CAO.IRI) Air Traffic Controller Licence Theoretical Knowledge Examination evaluates student controllers and rating applicants on the technical knowledge, regulatory standards, and operational competencies necessary to provide safe and expeditious air traffic services within Tehran Flight Information Region (OIIX FIR). Aligned with ICAO Annex 1, Annex 2, Annex 11, and ICAO Doc 4444 (PANS-ATM), the examination covers air law, aerodrome operations, radar and non-radar separation standards, aviation meteorology, surveillance technologies, human factors, and emergency response. This free practice bank provides 100 comprehensive practice questions with detailed explanations.

Exam sponsor: Civil Aviation Organization of the Islamic Republic of Iran (CAO.IRI). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The CAO.IRI Student ATCO Licence assessment comprises three stages: a Basic theoretical examination, a Rating theoretical examination tied to the rating sought, and a practical assessment of controlling ability. The written stages test air law and airspace rules, aerodrome control, approach and area control under ICAO Doc 4444, meteorology, navigation and surveillance, human performance, emergency procedures and radiotelephony. Candidates register by submitting an application form to the Air Navigation Services office.

Time Limit

Timed per subject module paper per CAO.IRI examination timetables.

Passing Score

The pass mark for CAO.IRI Student ATCO Licence examinations is fixed by the Civil Aviation Organization of Iran under its ATCO Licensing and Certification regulation and is not published on the organisation's public pages. Confirm the current figure with the Air Navigation Services office when you register.

Exam / Certification Fees

Fees are established by the CAO.IRI Personnel Licensing Directorate and administrative tariffs.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

15%

Air Law and Airspace Rules

ICAO Annexes 2 and 11, Iranian civil aviation legislation, Tehran FIR airspace classification, ATS organization, rules of the air, and ATC clearance legal authority.

15%

Aerodrome Control and Tower Operations

ICAO Annex 14, Tower (TWR) operations, runway incursion prevention, taxi clearances, visual circuit sequencing, surface movement management, and wake turbulence separation on departure/arrival.

20%

Approach and Area Control (PANS-ATM)

ICAO Doc 4444 (PANS-ATM), radar and non-radar separation standards, longitudinal, lateral, and vertical separation minima, holding procedures, speed control, and vectoring techniques.

15%

Aviation Meteorology and Altimetry

METAR, SPECI, TAF, and SIGMET decoding, QNH/QFE/standard altimeter settings, transition altitude/layer/level, low-level wind shear, microbursts, icing, and mountain wave hazards.

12%

Navigation Aids and Radar Surveillance

VOR, DME, ILS signal propagation and categories, RNAV/RNP specifications, Primary and Secondary Surveillance Radar (PSR/SSR Modes A, C, S), ADS-B, and multilateration systems.

Human Factors and Threat & Error Management

ATC situational awareness, vigilance degradation, circadian fatigue mitigation, shift work management, communication barriers, readback-hearback error traps, and Threat and Error Management (TEM).

Emergency Procedures and Alerting Service

Radio communication failure procedures, unlawful interference (squawk 7500), general emergency (squawk 7700), lost comms (squawk 7600), minimum fuel and Mayday Fuel declarations, and Search and Rescue (SAR) alerting phases (INCERFA, ALERFA, DETRESFA).

Radiotelephony and ATC Communications

ICAO Doc 9432 radiotelephony procedures, standard phraseology, mandatory readback requirements, transfer of communications and control, level change instructions, and frequency congestion management.

Preparing for the Iran CAO ATCO Theory Exam

What You Need to Know

Passing score: The pass mark for CAO.IRI Student ATCO Licence examinations is fixed by the Civil Aviation Organization of Iran under its ATCO Licensing and Certification regulation and is not published on the organisation's public pages. Confirm the current figure with the Air Navigation Services office when you register.
Assessment: The CAO.IRI Student ATCO Licence assessment comprises three stages: a Basic theoretical examination, a Rating theoretical examination tied to the rating sought, and a practical assessment of controlling ability. The written stages test air law and airspace rules, aerodrome control, approach and area control under ICAO Doc 4444, meteorology, navigation and surveillance, human performance, emergency procedures and radiotelephony. Candidates register by submitting an application form to the Air Navigation Services office.
Time limit: Timed per subject module paper per CAO.IRI examination timetables.
Exam / certification fees: Fees are established by the CAO.IRI Personnel Licensing Directorate and administrative tariffs. Official sources

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Frequently Asked Questions

What is the pass mark for the Iran CAO Student ATCO theoretical examination?

CAO.IRI sets the pass mark under its ATCO Licensing and Certification regulation, but does not publish it on its public pages. Rather than quote a figure taken from another authority, confirm the current standard with the Air Navigation Services office at the point of registration.

In what language is the CAO Iran ATCO theoretical examination conducted?

The theoretical knowledge examination is administered primarily in English, which serves as the international technical language for air traffic control, radiotelephony, and ICAO Doc 4444 standards, alongside Persian regulatory requirements applicable within the Islamic Republic of Iran.

What subjects are covered in the CAO.IRI ATCO theoretical syllabus?

The examination encompasses eight major subject areas: Air Law and Airspace Rules, Aerodrome Control, Approach and Area Control (PANS-ATM), Meteorology, Navigation and Surveillance, Human Factors, Emergency Procedures, and Radiotelephony Communications.

Which ratings require passing CAO.IRI ATCO theoretical examinations?

Theoretical examinations are required for the issuance of the Student Air Traffic Controller licence and subsequent rating endorsements, including Aerodrome Control (TWR), Approach Control Procedural (APP), Approach Control Surveillance (APS), Area Control Procedural (ACC), and Area Control Surveillance (ACS).

Is this practice question bank an official CAO.IRI examination?

No. This practice bank is an independent educational study resource developed by OpenExamPrep to assist student air traffic controllers and rating applicants in preparing for the theoretical topics examined under CAO.IRI and ICAO standards.

Can a multiple-choice bank prepare me for the whole Student ATCO assessment?

No. The CAO.IRI assessment includes a practical stage in which controlling ability is judged directly, and no question bank can stand in for that. These 100 questions are an independent English-language study aid for the knowledge tested in the Basic and Rating theoretical stages: separation standards, phraseology, procedures and emergency handling. Practical competence is built through approved training and simulation.