Kuwait DGCA IR Theory key terms

A mandatory notice issued by the state of registry requiring inspection, modification, or repair of an aircraft or component to restore an acceptable level of safety. Compliance is legally binding and must be recorded in the aircraft documents.

A document issued by the state of registry confirming that an individual aircraft conforms to its approved type design and is safe to operate within specified limitations. It remains valid only while maintenance and mandatory directives are complied with.

The set of processes, inspections, and records that keep an aircraft in a condition meeting its type certificate throughout its service life. It includes scheduled maintenance, defect reporting, airworthiness directives, and approved modifications.

An approved document listing equipment that may be inoperative while the aircraft still dispatches, subject to stated conditions and procedures. It is derived from the master minimum equipment list and requires authority approval for the operator.

An approval granted by the national aviation authority allowing a company to conduct specified commercial air transport operations. It defines the types of aircraft, routes, and operating specifications under which the holder may work.

The document, approved by the authority, containing the procedures, limitations, and instructions crew must follow for the operator's flights. Parts typically cover general operations, aircraft type procedures, route information, and training.

A written, agreed sequence of actions for a task that crew follow consistently to reduce error and standardise performance. In instrument flying, SOPs cover normal, abnormal, and emergency phases and are checked during proficiency assessments.

The aircraft system supplying total pressure from a forward-facing pitot tube and static pressure from flush ports to the airspeed indicator, altimeter, and vertical speed indicator. Blockages or leaks cause characteristic instrument errors.

The pressure reference entered on the altimeter subscale so the instrument displays the intended altitude datum. QNH gives elevation above mean sea level, QFE gives height above a reference point, and standard pressure is used above transition altitude.

The altitude at or below which the aircraft flies with the local pressure setting and above which it sets standard pressure. Its value is published for each aerodrome and marks the change to flight levels.

The lowest flight level available for use above the transition altitude, chosen so that at least a specified vertical separation exists between it and the transition altitude. It varies with the local pressure.

Coloured arcs and lines on the dial showing operating speed ranges: white for flap operating range, green for normal range, yellow for caution above maximum cruise, and a red radial for never-exceed speed.

The ratio of true airspeed to the local speed of sound, so it varies with temperature at altitude. High-altitude aircraft use it because compressibility effects and buffet margins depend on this ratio rather than on indicated airspeed.

The actual speed of the aircraft through the air mass, obtained by correcting indicated airspeed for position error, instrument error, pressure altitude, and temperature. It is used for flight planning and navigation calculations.

The speed of the aircraft over the ground, equal to true airspeed adjusted for the wind component along the track. It determines time en route and fuel consumed between points.

A vector diagram relating heading and true airspeed, wind direction and speed, and the resulting track and groundspeed. It is the basis for calculating drift, heading corrections, and estimated time en route.

The angular difference between the aircraft heading and the track actually made good over the ground. It results from the crosswind component and must be countered by turning the aircraft into wind.

The furthest point along a route from which the aircraft can return to a suitable aerodrome with the fuel remaining. It depends on wind, fuel consumption, and the reserve policy in force.

A position on track where the time to reach two diversion aerodromes is equal, used to decide which way to divert. It is recalculated for actual wind and is central to extended-range operations planning.

The fuel required beyond trip fuel to cover contingencies, diversion, holding, and final approach. It is defined by regulation and by the operator's policy, and must remain protected in flight planning.

A condition in which body tissues receive insufficient oxygen, causing impaired judgement, euphoria, and loss of consciousness. In aviation it arises from high altitude without supplemental oxygen, decompression, or certain medical conditions.

The period after loss of oxygen supply during which a person can still perform useful, deliberate actions before becoming incapacitated. It shortens rapidly as cabin altitude increases.

A pilot's mistaken perception of the aircraft's attitude or motion, usually when visual references are lost and vestibular cues mislead. It is countered by trusting instruments and maintaining a reliable scan.

A false sensation of pitching up or down caused by linear acceleration or deceleration stimulating the inner ear. During a rapid acceleration on take-off it can create a strong urge to push the nose down.

The effective use of all available resources - people, equipment, and information - to achieve safe flight. It covers communication, leadership, workload management, and decision-making within the crew.

The organised pattern of eye movements a pilot uses to monitor flight instruments and detect deviations early. A good scan mixes attitude, performance, and navigation instruments rather than fixating on one.

The altimeter subscale setting that, when entered, makes the altimeter indicate elevation above mean sea level at the aerodrome. It is the standard setting used for approach and landing in most states.

The pressure setting that makes the altimeter read height above a specified reference, usually the aerodrome. It is used in some states for approach and circuit work but does not give elevation above mean sea level.

The system that maintains a cabin altitude below the aircraft's flight altitude by controlling outflow of air. Failure requires oxygen use and descent to a safe altitude, and is a key emergency consideration.

A rapid change of wind speed or direction over a short distance, often near thunderstorms or frontal zones. On approach it can cause sudden airspeed and glidepath changes demanding immediate corrective action.

A small, intense downdraft that spreads out on reaching the ground, producing strong divergent winds. Encounter on approach or departure can cause severe performance loss and is a major low-level hazard.

A cumulonimbus cloud with strong updrafts, downdrafts, turbulence, icing, lightning, and heavy precipitation. It must be avoided by a wide margin, particularly below the cloud base where microbursts occur.

A ground station transmitting signals that let an aircraft determine its magnetic bearing from the station. It supports radials, position fixing, and airway navigation, and often carries distance-measuring equipment.

A magnetic bearing measured from a VOR station outward, expressed in degrees from magnetic north. An aircraft on a given radial is positioned along that line from the station, not necessarily flying towards it.

A transponder-based system giving slant range from a ground station by timing interrogations and replies. Altitude affects the accuracy at close range, so it reads slightly more than the horizontal distance.

The display showing lateral displacement from a selected course, with full-scale deflection representing a defined width in degrees. It is used with VOR, localiser, and GPS guidance to track a desired path.

A precision approach aid combining a localiser for lateral guidance and a glidepath for vertical guidance, with markers or DME for range. It allows descent to low decision heights in suitable weather.

The altitude on a precision approach at which a go-around must be initiated if the required visual references are not established. It is referenced to the altimeter with the appropriate pressure setting.

Satellite-based positioning providing aircraft position, track, and time for navigation and approach. Its accuracy depends on satellite geometry and signal integrity, which are monitored by augmentation systems.

A method of navigation allowing aircraft to fly any desired path within the coverage of navigation aids or satellite systems, rather than tracking directly between ground stations. It requires onboard computing and performance monitoring.