Bahrain CAA ATC Exam key terms

A rule allowing aircraft to fly 1,000 feet apart vertically between flight levels 290 and 410, instead of the standard 2,000 feet, provided the aircraft and operators meet approved height-keeping performance standards.

The smallest distance or time interval that air traffic control must keep between aircraft to prevent collision and reduce the risk of wake turbulence encounters. It may be vertical, lateral, or longitudinal.

Extra spacing applied behind heavier aircraft because wingtip vortices can upset or damage a following aircraft. Time or distance minima depend on the weight categories of the leading and following aircraft.

A surface of constant atmospheric pressure referenced to a standard datum of 1013.2 hectopascals and shown in hundreds of feet, used so that all aircraft above the transition altitude share one altimeter setting.

The height above the aerodrome at which an aircraft changes its altimeter from the local aerodrome pressure setting to the standard pressure setting, moving from altitudes to flight levels.

The aerodrome pressure setting that, when entered on an altimeter subscale, makes the instrument read aerodrome elevation when the aircraft is on the ground. It is used below the transition altitude.

The pressure setting that makes an altimeter read zero when the aircraft is at the aerodrome reference point, so the instrument indicates height above the aerodrome rather than altitude above mean sea level.

The pressure value provided by air traffic control or meteorological services for adjustment of an aircraft's altimeter subscale, ensuring height readings are consistent with the pressure datum in use.

An authorisation issued by air traffic control for an aircraft to proceed under specified conditions. It does not by itself relieve the pilot in command of responsibility for safety.

A pilot's repetition of a controller's instruction or clearance to confirm it was received and understood correctly. Certain safety-critical items require a full read-back before the instruction is acted upon.

Prescribed words and sentence patterns used in radiotelephony so that messages are brief, unambiguous, and understood identically by controllers and pilots regardless of native language or radio quality.

The standard set of code words (Alfa, Bravo, Charlie, and so on) used to spell out letters and groups that could otherwise be misheard over the radio, such as aircraft registrations and waypoint names.

A four-digit code set by the pilot in the transponder, as instructed by air traffic control, so that the aircraft's radar returns carry an identifiable code on the controller's display.

An airborne radio device that receives interrogations from ground radar and automatically replies with coded information such as identity and pressure altitude, enabling identification and height readout.

A radar system that sends interrogation signals to aircraft transponders and uses the replies to determine identity, altitude, and position, giving more information than primary radar alone.

A surveillance system that detects aircraft by receiving radio energy reflected from the aircraft's body, providing position without requiring any equipment on board the aircraft.

A surveillance technique in which aircraft automatically transmit position and other data derived from on-board systems, such as satellite navigation, to ground stations for use by air traffic control.

A satellite-based system providing position, velocity, and time information to suitably equipped aircraft, used as a navigation source and as the basis for performance-based navigation procedures.

A framework in which aircraft navigate along defined paths using on-board performance monitoring and alerting, rather than relying on ground-based navigation aids at fixed locations.

A navigation specification stating the accuracy an aircraft must maintain on a route or procedure, together with on-board performance monitoring and alerting that warns the crew when the requirement is not met.

A ground-based system giving aircraft guidance along a defined approach path using a localiser beam for lateral guidance and a glide path beam for vertical guidance, with markers or distance information.

The vertical guidance component of an instrument landing system, defining a descending approach angle that the aircraft follows towards the runway touchdown area.

A specified altitude on a precision approach at which a missed approach must be initiated if the required visual reference to continue the approach has not been established.

A manoeuvre flown when an approach cannot be continued to landing, following a published procedure that takes the aircraft away from the runway and back towards a safe altitude or holding fix.

A predetermined manoeuvre keeping an aircraft within a specified airspace while awaiting further clearance, normally flown as a race-track pattern with defined inbound and outbound legs and turn directions.

The air traffic control unit responsible for arriving and departing aircraft between the aerodrome environment and the area control regime, sequencing traffic and issuing approach clearances.

The unit providing air traffic control services to aerodrome traffic, including aircraft on the manoeuvring area and those flying in the vicinity of the aerodrome, using visual and radio observations.

The function within aerodrome control that manages aircraft and vehicles on taxiways and other parts of the manoeuvring area, keeping them clear of active runways except when specifically cleared.

Any unauthorised presence of an aircraft, vehicle, or person on a protected area of a runway, creating a risk of collision with aircraft taking off or landing.

A designated location on a taxiway where aircraft and vehicles must stop and await clearance before entering a runway, marked by surface markings and often accompanied by signs and lighting.

The formal authorisation given to a flight, specifying the route, level, and conditions under which it may proceed, which the crew must acknowledge and comply with unless an amended clearance is issued.

The unit providing air traffic control to flights operating on airways and routes outside the immediate vicinity of aerodromes, typically managing en-route separation and crossing traffic.

A system of lettered classes (A to G) defining what services and clearances are provided within a volume of airspace and whether flights must comply with instrument or visual flight rules.

Airspace of defined dimensions within which air traffic control service is provided to all flights in accordance with the airspace classification, and in which clearances are required.

The International Civil Aviation Organization standard covering aerodrome design and operations, including runway dimensions, markings, lighting, and obstacle limitation surfaces that states implement.

The national regulations issued by the Bahrain Civil Aviation Affairs authority that transpose ICAO standards into binding requirements for operations, licensing, and air traffic services within Bahrain.

A structured set of processes and accountabilities through which an aviation organisation identifies hazards, assesses and mitigates risk, and monitors safety performance to prevent accidents.

An organisational approach that encourages reporting of errors and hazards by distinguishing honest mistakes from reckless or deliberately unsafe behaviour, so that learning is not suppressed by fear of punishment.

A framework in which crews and controllers anticipate external threats, detect errors when they occur, and apply countermeasures so that errors do not develop into undesirable aircraft states.

A person's accurate ongoing understanding of what is happening around them, including aircraft positions, traffic, weather, and system status, which underpins sound decisions and safe control actions.

The practice of prioritising tasks, distributing effort, and using available resources so that demand stays within a controller's or pilot's capacity and performance does not degrade.

A sudden change in wind speed or direction over a short distance, often linked to thunderstorms or fronts, which can cause abrupt and dangerous changes in an aircraft's lift and flight path.

A small, intense downdraft that spreads outward on reaching the ground, producing a rapid headwind-to-tailwind change that can cause severe loss of performance on approach or departure.

An alert issued by a meteorological or aerodrome system to warn pilots and controllers of hazardous wind shear detected in the approach or departure path, prompting go-around or delay.

A cumulonimbus cloud producing lightning, heavy rain, hail, and strong gusty winds, with associated hazards to aviation including turbulence, icing, microbursts, and reduced visibility.

A classification based on maximum certificated take-off mass, used to determine wake turbulence separation minima between a leading and a following aircraft.

The condition of an aircraft, its engines, and equipment being certified and maintained to meet the safety standards required for safe flight, confirmed through certificates and continuing maintenance.

The measured capability of an aircraft in take-off, climb, cruise, and landing under given weight, temperature, pressure, and runway conditions, used to plan safe flight profiles.

Pressure altitude corrected for non-standard temperature, representing the altitude at which the aircraft's engines and wings effectively perform; high values reduce performance and lengthen take-off runs.