Bahrain CAA PPL key terms

A mandatory notice issued by the state of registry requiring inspection, modification, or repair of a specific aircraft type or component to correct an unsafe condition.

A document confirming that an individual aircraft conforms to its approved type design and is considered safe to operate when maintained in accordance with the applicable requirements.

The set of processes and tasks by which an aircraft is kept in a condition that meets the applicable airworthiness requirements throughout its operating life, including maintenance and defect control.

A certification signed by an authorised person confirming that specified maintenance has been completed and the aircraft or component is fit for return to service.

An approved document listing equipment that may be inoperative at dispatch, together with the conditions and limitations under which the aircraft may still be operated safely.

Weather conditions in which flight visibility and distance from cloud meet or exceed the specified minima, permitting flight under visual flight rules.

Weather conditions in which visibility or distance from cloud is below the specified minima for visual flight, so the flight must be conducted under instrument flight rules.

A set of operating and navigation rules under which a pilot may fly while remaining clear of cloud and maintaining the required flight visibility and separation from terrain.

Rules governing flight in which navigation and separation are conducted primarily by reference to instruments, requiring the pilot to hold an instrument rating and file an appropriate flight plan.

An air traffic control authorisation allowing a flight to operate within a control zone in conditions below normal VMC minima, subject to specified local conditions and pilot qualifications.

Controlled airspace extending upward from the surface to a specified upper limit around an aerodrome, within which air traffic control clearance is required for flight.

An authorisation issued by air traffic control for an aircraft to proceed under specified conditions, which the pilot must comply with unless a safety concern requires deviation.

The mandatory repetition by a pilot of safety-related clearance elements, such as route, altitude, and frequency, so that the controller can verify correct receipt.

The agreed set of words and sentence patterns used in radiotelephony so that messages are understood consistently by pilots and controllers, reducing misunderstanding and ambiguity.

A radio receiver circuit that mutes audio output when no usable signal is present, suppressing continuous background noise and allowing the pilot to monitor the channel comfortably.

The angle between the chord line of a wing and the relative airflow approaching it; increasing this angle raises lift until the critical value is reached.

The angle of attack at which airflow separates from the upper wing surface and lift begins to decrease, marking the onset of a stall regardless of airspeed, attitude, or weight.

A condition in which the wing exceeds its critical angle of attack, causing loss of lift and often buffet, which is recovered by reducing the angle of attack.

The ratio of total lift produced to the gross weight of the aircraft; it increases in turns and manoeuvres and raises the speed at which the wing stalls.

Drag that results from the production of lift, caused mainly by wingtip vortices, and which decreases as airspeed increases while increasing with higher load factors.

The point through which the total weight of the aircraft is considered to act; its position must remain within approved limits for safe control and stability.

The horizontal distance from a reference datum to a point where a mass acts, used with the mass to calculate a moment for centre of gravity determination.

A document recording masses placed aboard an aircraft and their positions, used to verify that the take-off weight and centre of gravity remain within approved limits.

The greatest mass at which the aircraft is certified to begin the take-off run, limited by structural strength, performance, and, on some flights, runway or climb requirements.

The altitude in the standard atmosphere at which the air density equals the actual density at the aircraft's location; high values reduce engine power and propeller thrust and lengthen take-off distance.

The altimeter subscale setting that, when applied at aerodrome level, causes the altimeter to indicate the elevation of the aerodrome above mean sea level.

The altimeter subscale setting that causes the altimeter to read zero when the aircraft is on the aerodrome reference point, giving height above that point rather than altitude.

The altitude at or below which the vertical position of an aircraft is expressed as an altitude referenced to QNH, and above which flight levels based on standard pressure are used.

The fixed subscale value of 1013.2 hectopascals set on the altimeter when flying at or above the transition level, so that all aircraft share a common pressure reference.

A surface of constant atmospheric pressure related to the standard pressure setting and expressed in hundreds of feet, used for vertical separation above the transition altitude.

A condition in which the tissues receive insufficient oxygen, producing symptoms such as euphoria, poor judgement, and headache, with effects worsening as altitude increases without supplementary oxygen.

The period after exposure to a given altitude during which a person can still perform useful, purposeful tasks before incapacitation from oxygen deprivation occurs.

Overbreathing that reduces carbon dioxide in the blood, causing dizziness, tingling, and anxiety that can mimic hypoxia and must be distinguished from it in flight.

A pilot's mistaken perception of the aircraft's attitude or motion, often caused by conflicting vestibular and visual cues in the absence of a reliable outside horizon.

The inner-ear organs that sense angular acceleration and gravity, providing balance cues that can mislead a pilot when visual references are lost during manoeuvres.

A false sensation of pitching up or down caused by linear acceleration or deceleration, which may prompt an inappropriate control input during take-off or go-around.

A line drawn on a weather chart joining places of equal mean sea level pressure, used to identify pressure systems and the strength of the pressure gradient.

The rate at which atmospheric pressure changes over horizontal distance; a steep gradient produces stronger winds and closer spacing of isobars on a chart.

The apparent deflection of moving air caused by the earth's rotation, turning wind to the right in the northern hemisphere and to the left in the southern hemisphere.

A change in wind speed or direction over a short distance, either vertically or horizontally, which can cause sudden airspeed and lift changes on approach or departure.

A localized, intense downdraught that spreads outwards on reaching the surface, producing a sharp wind change and severe performance loss close to the ground.

A north-south great circle on the earth's surface joining the poles, with longitude measured east or west of the prime meridian at Greenwich.

A circle on the earth's surface whose plane passes through the centre of the earth, representing the shortest path between two points on the globe.

The angular difference between true north and magnetic north at a given place, applied when converting between true and magnetic bearings on a chart.

The error in a compass caused by magnetic fields within the aircraft, varying with heading and corrected by reference to a compass swing card.

A ground reference manoeuvre flown at a constant radius around a selected feature, requiring varied bank to compensate for drift and maintain a uniform distance.