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IAA ATCO Licence Theory study materials
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IAA ATCO Licence Theory practice questions

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Question 1Air Law

Under the ICAO Convention on International Civil Aviation (Chicago Convention), which body is the permanent governing organ responsible for adopting and amending the Annexes to the Convention?

  1. The International Court of Justice
  2. The Air Navigation Commission
  3. The ICAO Council Correct answer.
  4. The ICAO Assembly

Explanation

The Council is the permanent governing body of ICAO and is empowered under Article 54 to adopt and amend Annexes to the Chicago Convention. The Assembly meets periodically but does not perform Annex adoption. The Air Navigation Commission is a technical advisory body that recommends standards rather than adopting them.

Question 2Air Law

Which ICAO Annex contains the Standards and Recommended Practices governing the licensing of air traffic controllers?

  1. Annex 14
  2. Annex 11
  3. Annex 2
  4. Annex 1 Correct answer.

Explanation

Annex 1, Personnel Licensing, sets out the requirements for licensing flight crew and air traffic controllers, including knowledge, experience and medical requirements. Annex 2 deals with Rules of the Air, Annex 11 with Air Traffic Services and Annex 14 with Aerodromes.

Question 3Air Law

A controller holds a rating that authorises the provision of aerodrome control service. Which additional endorsement is required before that controller may issue clearances to aircraft operating on the manoeuvring area of a controlled aerodrome?

  1. No additional endorsement is required beyond the aerodrome control rating Correct answer.
  2. An area control endorsement
  3. An approach procedural endorsement
  4. A surface movement radar endorsement

Explanation

The aerodrome control rating itself authorises the holder to provide aerodrome control service, including clearances to aircraft and vehicles on the manoeuvring area. Approach procedural and area control endorsements relate to other ratings. Surface movement radar is equipment-related training, not a licensing endorsement required for the basic privilege.

Question 4Air Law

Which medical certificate class is required for a holder of an air traffic controller licence to exercise the privileges of that licence?

  1. Class 1
  2. Class 4
  3. Class 2
  4. Class 3 Correct answer.

Explanation

Under Annex 1, air traffic controllers must hold a valid Class 3 medical certificate. Class 1 applies to commercial pilots and Class 2 to private pilots and certain other personnel. There is no Class 4 certificate in the ICAO framework.

Question 5Air Law

Under the Rules of the Air, what is the meaning of the term 'controlled airspace'?

  1. Airspace of defined dimensions within which air traffic control service is provided to IFR flights and to VFR flights in accordance with the airspace classification Correct answer.
  2. Airspace in which position reporting is mandatory for all aircraft
  3. Airspace surrounding a controlled aerodrome within a radius of five nautical miles
  4. Airspace within which all flights must be conducted under instrument flight rules

Explanation

Controlled airspace is defined by dimensions in which ATC service is provided to IFR flights and to VFR flights in accordance with the airspace classification. It does not require all flights to be IFR, nor is it defined by a fixed radius around an aerodrome. Position reporting requirements depend on the airspace class and flight rules.

Question 6Air Law

Two aircraft are converging at approximately the same level. An aircraft to the right of another has the right of way. What must the other aircraft do?

  1. Give way by altering heading to pass behind the aircraft on its right Correct answer.
  2. Maintain heading and speed because it is the faster aircraft
  3. Reduce speed and continue on the same track
  4. Climb immediately to establish vertical separation

Explanation

The right-of-way rule requires the aircraft that does not have the right of way to give way, and when both are at the same level the aircraft on the right has priority. The give-way aircraft should alter heading to pass behind the other. Speed, climb performance or maintaining track do not override the rule.

Question 7Air Law

An aircraft on final approach to land is at approximately 300 feet above the aerodrome. Which category of wake turbulence does this aircraft present to a following aircraft?

  1. Light
  2. Super
  3. Heavy
  4. Medium Correct answer.

Explanation

Wake turbulence categories are based on maximum certificated take-off mass. Aircraft of 7,000 kg up to but not including 136,000 kg are Medium, so an aircraft on short final in that mass band is Medium regardless of its height. Light covers aircraft of 7,000 kg or less, Heavy covers 136,000 kg or more, and Super is the special category for the A380.

Question 8Air Law

An aircraft is being vectored for an approach and the controller issues a heading that will take it through the localiser. What is the controller's responsibility with respect to the aircraft's navigation?

  1. The pilot assumes navigation responsibility as soon as the heading is acknowledged
  2. The controller retains responsibility for navigation while the aircraft is being vectored Correct answer.
  3. Responsibility transfers automatically when the aircraft is within 10 NM of the threshold
  4. Responsibility is shared equally between controller and pilot

Explanation

When an aircraft is being vectored, the controller is responsible for navigation, including terrain and obstacle clearance within the vectoring area. The pilot retains responsibility for the safe conduct of the flight and for collision avoidance. Responsibility does not transfer automatically on acknowledgement or at a fixed distance.

Question 9Air Law

What is the standard separation minimum applied between two IFR aircraft at the same level in controlled airspace where radar control is provided and the required surveillance performance is met?

  1. 3 NM
  2. 15 NM
  3. 5 NM Correct answer.
  4. 10 NM

Explanation

In radar-controlled airspace where the required surveillance performance is met, the standard lateral separation minimum between identified aircraft at the same level is 5 NM. A 3 NM minimum is applied only in designated terminal areas with specific approval and equipment. 10 NM and 15 NM are not standard same-level minima.

Question 10Air Law

A pilot reports a suspected bird strike and requests to return to the aerodrome. Which of the following best describes the controller's immediate priority?

  1. Transfer the aircraft to approach control without further action
  2. Insist that the pilot complete a full circuit before landing
  3. Provide the assistance the pilot requests and alert the aerodrome emergency services as appropriate Correct answer.
  4. Require the pilot to file a written report before landing

Explanation

When an aircraft is in an emergency or potential emergency, the controller should give the assistance requested and take action to safeguard the flight, which includes alerting emergency services when appropriate. Requiring circuits or paperwork before landing is inappropriate. Simply transferring the aircraft without taking action does not address the emergency.

Question 11Air Law

Under Annex 11, what is the minimum period for which an air traffic controller must be given rest before starting a duty period?

  1. A fixed minimum of 8 hours
  2. The rest period must be sufficient to ensure the controller is fit for duty at the start of the period Correct answer.
  3. A fixed minimum of 24 hours
  4. A fixed minimum of 12 hours

Explanation

Annex 11 requires that controllers be given rest periods sufficient to ensure they are fit for duty at the start of the duty period, rather than prescribing a single fixed number of hours. This allows States to set detailed limits in their own regulations. Fixed figures such as 8, 12 or 24 hours are not the Annex 11 formulation.

Question 12Air Law

What does the abbreviation ATIS stand for in air traffic services?

  1. Approach and Terminal Information Standard
  2. Automatic Terminal Information Service Correct answer.
  3. Aerodrome Traffic Information System
  4. Air Traffic Integration Service

Explanation

ATIS is the Automatic Terminal Information Service, a continuous broadcast of recorded non-control information such as weather and runway in use. The other expansions do not correspond to any standard ICAO term. Controllers should confirm the current ATIS letter when an aircraft reports having received it.

Question 13Air Law

A controlled flight is about to enter an area where it will be beyond the range of the radar and radio coverage of the controlling unit. What action should the controller take before the aircraft leaves coverage?

  1. Coordinate the transfer of control and advise the pilot of the point at which communications will be lost Correct answer.
  2. Require the pilot to maintain the last assigned heading indefinitely
  3. Instruct the pilot to descend immediately to the lowest available level
  4. Cancel the flight plan and release the aircraft from control

Explanation

Before an aircraft leaves coverage, the controller should coordinate with the next unit and inform the pilot of the point at which radio contact will be lost. This allows the pilot to plan the transition to procedural communication. Immediate descent, cancelling the flight plan or indefinite headings are not appropriate actions.

Question 14Air Law

What is the purpose of a clearance limit in an ATC clearance?

  1. It gives the aircraft permission to deviate from its route
  2. It specifies the maximum altitude the aircraft may climb to
  3. It defines the point to which the aircraft is cleared and requires further clearance before proceeding beyond it Correct answer.
  4. It identifies the runway the aircraft must use for landing

Explanation

A clearance limit identifies the point to which an aircraft is cleared; unless the clearance specifies otherwise, the aircraft must obtain further clearance before proceeding beyond it. It is not an altitude limit, a runway assignment or a route deviation authority. The clearance limit is a core element of the ATC clearance.

Question 15Air Law

An aircraft is cleared to descend to 4,000 ft while another aircraft is maintaining 4,000 ft on the same track. What is the key principle the controller must apply?

  1. Vertical separation must be maintained until the descending aircraft has crossed the level and is confirmed at a different level Correct answer.
  2. Separation is no longer required once both aircraft are in the same control area
  3. The controller should rely on the pilot to see and avoid
  4. The descending aircraft may continue because it has been cleared

Explanation

Clearing an aircraft to a level occupied by another aircraft on the same track requires that separation be maintained until the descending aircraft has passed the level and is established at a different level. A clearance alone does not create separation. See-and-avoid is not a substitute for the required separation, and separation is not dispensed with within a control area.

Question 16Air Law

What does the term 'SID' refer to in air traffic services?

  1. A Safety Investigation Directive
  2. A Standard Instrument Departure procedure Correct answer.
  3. A Surface Identification Display
  4. A Standard Instrument Descent procedure

Explanation

A SID is a Standard Instrument Departure, a published ATC departure procedure for use by IFR aircraft. It is not a descent procedure, a surface display or a safety directive. SIDs are normally referenced by name and number in the ATC clearance.

Question 17Air Law

A pilot requests a clearance to enter controlled airspace but is unable to comply with the prescribed VMC minima. What is the correct controller response?

  1. Refer the request to the aerodrome operator
  2. Issue the clearance and rely on the pilot to maintain separation
  3. Withhold the clearance and advise the pilot of the reason Correct answer.
  4. Issue the clearance with a restriction on altitude only

Explanation

A clearance into controlled airspace should not be issued when the pilot cannot comply with the conditions for entry, and the controller should inform the pilot why it is withheld. Issuing a clearance while relying on the pilot to maintain separation would not discharge the controller's responsibility. Altitude restrictions alone do not resolve the inability to meet VMC minima.

Question 18Air Law

Which of the following statements correctly describes the relationship between a Standard and a Recommended Practice in an ICAO Annex?

  1. A Recommended Practice is mandatory and a Standard is advisory
  2. A Standard applies only to flight crew, while a Recommended Practice applies only to controllers
  3. A Standard and a Recommended Practice are legally identical in all respects
  4. A Standard is a specification whose uniform application is recognised as necessary, while a Recommended Practice is desirable but not mandatory Correct answer.

Explanation

A Standard is a specification whose uniform application is recognised as necessary for the safety or regularity of international air navigation, and States must notify any difference. A Recommended Practice is recognised as desirable but not essential. The two are not identical, and the distinction is not based on the personnel category.

Question 19Air Law

What is the purpose of the read-back requirement for ATC clearances and instructions?

  1. To provide a written record for later investigation only
  2. To enable the controller to verify that the clearance has been correctly understood and will be complied with Correct answer.
  3. To satisfy a requirement that applies only to IFR flights
  4. To allow the pilot to request a different clearance

Explanation

Read-back allows the controller to listen for and correct any error in the transmitted clearance, ensuring the pilot has understood and will comply. It is not merely a record for investigations and applies to both IFR and VFR flights when a clearance is issued. It is not a mechanism for requesting an alternative clearance.

Question 20Air Law

An aircraft has been instructed to hold at a VOR and the holding fix is defined by the VOR. What is the standard inbound holding track normally used unless otherwise specified?

  1. The radial specified in the holding instruction or published procedure Correct answer.
  2. The aircraft's current track at the moment of entry
  3. The reciprocal of the outbound leg
  4. The runway heading in use at the destination

Explanation

The inbound holding track is the radial or bearing specified in the holding instruction or published procedure. It is not derived from the outbound leg reciprocal, the runway heading or the aircraft's track at entry. Controllers must state the inbound track when it is not published.

Question 21Air Traffic Management

In an ATS route designator such as ATS route 'L980', what does the letter prefix indicate?

  1. The route is an RNAV route within the European region
  2. The route is a conditional route available only by prior notification
  3. The route forms part of the regional low-level airway network Correct answer.
  4. The route is a North Atlantic organized track system route

Explanation

In the ICAO route designator system, the prefix letter identifies the type of route: 'L' denotes a low-level airway within the regional network, while 'U' denotes an upper airway. The numeric part distinguishes individual routes within that category.

Question 22Air Traffic Management

Which body is responsible for establishing the Air Traffic Services airspace classes and their associated separation and service requirements?

  1. The regional meteorological office
  2. The individual aerodrome operator
  3. ICAO through Annex 11 Correct answer.
  4. The aircraft operator's national authority

Explanation

ICAO Annex 11 defines the seven ATS airspace classes (A to G) and the services and separation provided in each. States then implement these classes within their own airspace.

Question 23Air Traffic Management

An aircraft is operating in Class C airspace. Which statement correctly describes the separation provided?

  1. Only IFR flights are separated from other IFR flights; VFR flights receive no service
  2. IFR flights are separated from all other IFR and VFR flights, and VFR flights receive traffic information about other VFR flights Correct answer.
  3. No separation is provided to any flight in Class C airspace
  4. All flights, IFR and VFR, are separated from each other

Explanation

Class C provides separation between IFR flights and between IFR and VFR flights, while VFR flights receive traffic information in respect of other VFR flights. This distinguishes it from Class B, where all flights are separated from each other.

Question 24Air Traffic Management

Under what condition may a controlled flight be cleared to cross an active runway without prior coordination with the aerodrome control tower?

  1. When the approach controller has established two-way radio contact
  2. When the aircraft is operating under a special VFR clearance
  3. When the aerodrome controller has issued a standing agreement permitting it Correct answer.
  4. When the aircraft is on final approach and the runway is clear

Explanation

Crossing an active runway requires coordination between the approach/area controller and the aerodrome controller unless a standing agreement (letter of agreement) has established the conditions under which it may occur. Without such an agreement, individual coordination is mandatory.

Question 25Air Traffic Management

In a radar environment, what is the standard minimum radar separation between two aircraft identified on the same surveillance display, unless otherwise prescribed?

  1. 3 NM
  2. 5 NM Correct answer.
  3. 10 NM
  4. 15 NM

Explanation

The standard minimum radar separation for aircraft on the same display is 5 NM, unless a reduced separation minimum has been approved and published for the specific environment. This value is specified in ICAO Doc 4444.

Question 26Air Traffic Management

An aircraft is cleared to descend from FL 300 to FL 200. What is the primary purpose of the 'descend to' clearance in terms of vertical separation?

  1. To permit the aircraft to descend below the minimum safe altitude
  2. To transfer responsibility for the aircraft to the next control unit
  3. To authorize the aircraft to leave FL 300 and descend at its discretion
  4. To establish the aircraft at a new level while maintaining separation from other traffic during the descent Correct answer.

Explanation

A level clearance authorizes the aircraft to change level and establishes it at the new level, while the controller must ensure separation is maintained throughout the descent. It does not transfer control or waive minimum safe altitude requirements.

Question 27Air Traffic Management

Which of the following correctly describes a 'level' in air traffic control terminology?

  1. A vertical position of an aircraft in flight expressed as a pressure altitude at a standard datum Correct answer.
  2. The height of an aircraft above the ground at any moment
  3. The altitude of an aircraft above the aerodrome reference point
  4. The flight level assigned to an aircraft during climb only

Explanation

A level is a generic term for the vertical position of an aircraft in flight, expressed as a flight level or altitude referenced to a standard pressure datum. It is not tied to a specific phase of flight.

Question 28Air Traffic Management

What is the purpose of a flight level allocation scheme (semi-circular rule) in airspace where it is applied?

  1. To determine the minimum fuel required for the flight
  2. To assign levels according to aircraft weight category
  3. To ensure aircraft on opposing tracks are separated vertically by assigning levels according to magnetic track Correct answer.
  4. To allocate levels based on the aircraft's destination aerodrome

Explanation

The semi-circular rule assigns flight levels according to magnetic track, so that aircraft flying in opposing directions are allocated different level bands. This provides vertical separation between aircraft on reciprocal tracks.

Question 29Air Traffic Management

Which condition must be satisfied before an aircraft can be cleared to maintain 'own separation' during a climb or descent in visual meteorological conditions?

  1. The aircraft must be equipped with TCAS
  2. The pilot must report the other aircraft in sight and accept responsibility for maintaining separation Correct answer.
  3. The aircraft must be above FL 200
  4. The controller must have radar contact with both aircraft

Explanation

Own separation in VMC requires that the pilot reports the other aircraft in sight and accepts responsibility for maintaining separation during the manoeuvre. The controller retains responsibility for the rest of the clearance.

Question 30Air Traffic Management

In the event of a radio communication failure, what is the standard action for an IFR aircraft operating in controlled airspace?

  1. Immediately descend to the lowest safe altitude and hold
  2. Continue according to the last acknowledged clearance and the published communication failure procedures Correct answer.
  3. Turn back to the departure aerodrome
  4. Squawk 7700 and land at the nearest aerodrome

Explanation

The standard communication failure procedure requires the aircraft to continue in accordance with the last acknowledged clearance and the published procedures, which include specific routing and level requirements. This allows the controller to predict the aircraft's behaviour.

Question 31Air Traffic Management

Which of the following best describes the function of an ATS surveillance system in providing separation?

  1. It provides meteorological information to the controller
  2. It provides position information to the controller, enabling the identification and monitoring of aircraft Correct answer.
  3. It replaces the need for flight plan data
  4. It automatically resolves all conflicts between aircraft

Explanation

An ATS surveillance system provides position and identification information that enables the controller to identify aircraft and monitor separation. It is an aid to the controller, who remains responsible for separation.

Question 32Air Traffic Management

What is the minimum horizontal separation required between an aircraft on approach and an aircraft holding at the same level in the same airspace, when radar separation is applied?

  1. 2 NM
  2. 3 NM
  3. 10 NM
  4. 5 NM Correct answer.

Explanation

The standard minimum radar separation of 5 NM applies between identified aircraft in the same airspace unless a reduced minimum has been approved. Holding and approach traffic must be kept at least at this distance.

Question 33Air Traffic Management

When may a controller issue a clearance that requires an aircraft to cross the path of another aircraft at the same level?

  1. When the aircraft has TCAS equipment
  2. When the crossing occurs above FL 300
  3. When vertical or lateral separation is assured or the crossing is coordinated and separation is maintained Correct answer.
  4. When both aircraft are in VMC

Explanation

A crossing clearance may only be issued when separation is assured, either vertically, laterally or by coordination that maintains the required minimum. Visual meteorological conditions alone do not guarantee separation.

Question 34Air Traffic Management

What is the purpose of a letter of agreement between two ATS units?

  1. To certify the competence of individual controllers
  2. To define the conditions and procedures for the transfer of control and coordination between the units Correct answer.
  3. To establish the airspace classification of the units' areas
  4. To authorize the units to conduct radar approaches

Explanation

A letter of agreement specifies the procedures, conditions and responsibilities for coordination and transfer of control between adjacent ATS units. It ensures that both units apply consistent separation and transfer criteria.

Question 35Air Traffic Management

An aircraft is cleared to hold at a VOR at FL 150 with a published holding pattern. What is the standard inbound leg time for the holding pattern at this level?

  1. 1 minute Correct answer.
  2. 1.5 minutes
  3. 2 minutes
  4. 3 minutes

Explanation

The standard holding pattern uses a 1-minute inbound leg, measured from the abeam position to the holding fix. At higher levels, the inbound leg may be adjusted to 1.5 minutes in some procedures, but the standard is 1 minute.

Question 36Air Traffic Management

Which of the following correctly describes the purpose of a 'clearance limit' in an IFR clearance?

  1. The minimum fuel required at destination
  2. The point to which the aircraft is cleared to proceed Correct answer.
  3. The time by which the aircraft must depart
  4. The maximum altitude the aircraft may climb to

Explanation

The clearance limit is the point to which an aircraft is granted an ATC clearance, typically the destination aerodrome or a specified fix. It defines the extent of the cleared route.

Question 37Air Traffic Management

In which situation must a controller apply wake turbulence separation between two aircraft?

  1. When two aircraft are on parallel runways separated by less than 760 metres
  2. When a lighter aircraft follows a heavier aircraft on the same approach path Correct answer.
  3. When both aircraft are of the same wake turbulence category
  4. When the following aircraft is at a higher level than the leading aircraft

Explanation

Wake turbulence separation is applied when a following aircraft may be affected by the wake of a preceding aircraft, particularly when a lighter category follows a heavier one. The separation minima depend on the wake turbulence categories of both aircraft.

Question 38Air Traffic Management

What does the term 'essential traffic' mean in air traffic control?

  1. Controlled traffic for which separation is not provided but which is known to the controller Correct answer.
  2. Traffic that must be separated by at least 5 NM
  3. Traffic operating under a special VFR clearance
  4. Traffic that has declared an emergency

Explanation

Essential traffic is controlled traffic for which separation is not provided by the controller concerned, but which is known and passed as traffic information. This concept is important in airspace where separation responsibility is delegated.

Question 39Air Traffic Management

Which of the following is a required element of a 'traffic information' message passed to an aircraft?

  1. Relative bearing, distance and level of the conflicting traffic Correct answer.
  2. The registration of the conflicting aircraft
  3. The destination of the conflicting aircraft
  4. The wake turbulence category of the conflicting aircraft

Explanation

Traffic information includes the position of the conflicting traffic relative to the aircraft (bearing and distance) and its level, so that the pilot can locate it visually or on the display. Registration and destination are not required elements.

Question 40Air Traffic Management

What is the purpose of a 'level restriction' in an ATC clearance?

  1. To limit the aircraft's maximum speed
  2. To require the aircraft to hold at a fix
  3. To restrict the aircraft to a particular route
  4. To require the aircraft to maintain a specified level until a specified point or condition Correct answer.

Explanation

A level restriction requires the aircraft to maintain a specified level until a defined point or condition is reached, after which it may change level. It is used to manage vertical profiles and separation.

Question 41Air Traffic Management

An aircraft is at FL 100 and requests a climb to FL 200. The controller observes another aircraft at FL 150 on a crossing track. What is the appropriate action?

  1. Issue a climb to FL 200 only after ensuring vertical or lateral separation from the crossing traffic Correct answer.
  2. Issue a climb to FL 150 and hold there indefinitely
  3. Issue a climb to FL 200 immediately because the request is routine
  4. Refuse the climb without explanation

Explanation

Before clearing a climb through levels occupied by other traffic, the controller must ensure that separation is maintained, either by stopping the climb below the conflicting level or by ensuring lateral separation. Issuing the clearance without checking would compromise separation.

Question 42Air Traffic Management

Which of the following correctly describes the purpose of a 'position report' in procedural control?

  1. To confirm the aircraft's fuel state
  2. To request a change of level
  3. To notify the controller of the aircraft's destination
  4. To provide the controller with the aircraft's position and time over a reporting point for separation purposes Correct answer.

Explanation

Position reports provide the controller with the aircraft's position, time and level over designated reporting points, enabling separation in procedural control where surveillance is not available. They are the basis for estimating and separating traffic.

Question 43Air Traffic Management

What is the standard separation minimum between two aircraft at the same level in procedural control using the Mach number technique on the same track?

  1. 10 minutes Correct answer.
  2. 3 minutes
  3. 5 minutes
  4. 15 minutes

Explanation

In procedural control, the standard longitudinal separation between aircraft on the same track at the same level is 10 minutes, unless a reduced separation is approved based on the Mach number technique or other criteria.

Question 44Air Traffic Management

Which of the following is a responsibility of the aerodrome controller regarding runway incursions?

  1. Certifying the aerodrome's rescue and fire fighting category
  2. Publishing the aerodrome's instrument approach procedures
  3. Issuing clearances that ensure the runway is protected before authorizing its use Correct answer.
  4. Approving the aerodrome's runway layout

Explanation

The aerodrome controller is responsible for ensuring that the runway is clear and protected before issuing clearances for its use, thereby preventing runway incursions. Other listed tasks fall to different authorities.

Question 45Air Traffic Management

When a controlled aircraft is in an emergency and requests priority, what is the controller's primary responsibility?

  1. To transfer control to the next unit immediately
  2. To require the aircraft to follow its original clearance
  3. To record the event for later investigation before acting
  4. To provide priority and assistance, and to keep other traffic separated from the emergency aircraft Correct answer.

Explanation

In an emergency, the controller's priority is to provide assistance and priority to the aircraft while keeping other traffic clear of it. Administrative recording can follow once the situation is under control.

Question 46Air Traffic Management

Under ICAO rules, which altimeter setting is used by an aircraft flying at a cruising level above the transition altitude within controlled airspace?

  1. The QFE of the departure aerodrome, with the aircraft reporting height above that point
  2. The lowest forecast QNH within the FIR, with the aircraft reporting a flight level
  3. The local QNH of the nearest aerodrome, with the aircraft reporting an altitude
  4. The standard pressure setting of 1013.2 hPa, with the aircraft reporting a flight level Correct answer.

Explanation

Above the transition altitude all aircraft set the standard pressure 1013.2 hPa so that terrain clearance is not affected by local pressure changes and vertical separation between aircraft is measured against a common datum. The resulting value is expressed as a flight level. Below the transition altitude, QNH is used and the value is expressed as an altitude.

Question 47Air Traffic Management

Two aircraft are established in level flight in controlled airspace under radar control at the same flight level. The controller observes that the Mode C indications differ by about 200 feet and the radar tracks are 4 NM apart laterally. What action is appropriate?

  1. Reduce separation to 3 NM because the aircraft are under radar control at the same level
  2. Transfer the aircraft to procedural control until the Mode C difference is resolved
  3. Continue to apply the prescribed horizontal radar separation minimum, since displayed Mode C differences do not by themselves constitute a loss of vertical separation Correct answer.
  4. Apply vertical separation immediately because the Mode C difference shows the aircraft are not at the same level

Explanation

Mode C is an approximate pressure-altitude indication with a tolerance, so small differences between two aircraft cleared to the same level are normal and do not indicate a breakdown of level separation. The controller maintains separation using the applicable radar horizontal minimum. Action is required only when an aircraft is observed significantly off its cleared level or when the prescribed separation is actually lost.

Question 48Air Traffic Management

An airspace planner is designing a system of routes where aircraft will cross a busy flow at the same cruising level. Which measure most directly reduces the need for individual controller interventions while preserving the required separation?

  1. Increasing the number of position reports required from aircraft along the route
  2. Delegating all crossing traffic to the adjacent ATS unit without a written agreement
  3. Establishing crossing points at defined fixes with published level or time restrictions so that traffic is deconflicted by design Correct answer.
  4. Allowing aircraft to negotiate their own crossing levels by air-to-air communication

Explanation

Conflict-free route design uses defined crossing points, level bands and time restrictions so that traffic is separated by the structure of the route system rather than by ad hoc controller action. This reduces workload and the chance of error at busy crossing points. It must still be supported by coordination procedures and, where units are involved, by formal agreements.

Question 49Meteorology

In a METAR, which cloud group indicates a layer whose base is between 30 and 600 metres above the aerodrome reference point when the aerodrome elevation is 200 ft AMSL?

  1. SCT003 Correct answer.
  2. FEW005
  3. BKN010
  4. OVC002

Explanation

Cloud heights in METAR are reported in hundreds of feet above aerodrome elevation, not above mean sea level. With an elevation of 200 ft, a base between 30 and 600 m (roughly 100 to 2000 ft) above the reference point corresponds to a reported height of 003 to 020. SCT003 therefore matches the stated band.

Question 50Meteorology

A TAF for an aerodrome reads 'TEMPO 1212/1216 2500 SHRA BKN008'. What does this forecast mean for a pilot arriving at 1400 UTC?

  1. The conditions will persist for the whole four-hour period without change
  2. The forecast applies only if the wind is from 250 degrees
  3. The aerodrome will be closed between 1200 and 1600 UTC
  4. Temporary fluctuations to the stated visibility, showers and cloud are expected during that window Correct answer.

Explanation

TEMPO indicates temporary fluctuations expected to last less than one hour at a time and covering less than half the period. The group therefore describes intermittent deteriorations to 2500 m visibility, rain showers and a broken layer at 800 ft. A pilot arriving at 1400 UTC must expect these conditions to occur at times, not continuously.