TC Gyroplane Pilot Permit (GYROP) key terms

An official document confirming that an individual aircraft meets its approved type design and is safe to operate within stated limitations, subject to continuing maintenance and inspection requirements.

Approval issued for a specific aircraft design, confirming the prototype met the applicable airworthiness standards; individual aircraft are then built and certified against it.

A mandatory instruction issued by the aviation authority requiring inspection, modification, or restriction on aircraft, engines, or components to correct an unsafe condition.

The licence document authorising a person to act as pilot of a gyroplane, carrying privileges, ratings, and limitations such as validity periods and medical requirements.

An endorsement on a pilot permit or licence permitting flight of a category of aircraft, for example gyroplanes, and typically renewed through recency or re-examination.

A document issued after examination by an authorised medical examiner confirming the holder meets the fitness standards required to exercise pilot privileges.

Airspace of defined dimensions within which air traffic control service is provided and in which clearance or specific procedures are required before entry.

A designated radio frequency that aircraft must monitor and use for position reports when operating at or near an aerodrome without an operating control tower.

Airborne radio equipment that replies to ground radar interrogations, transmitting identification and altitude information to assist air traffic control surveillance.

A four-digit octal code set on the transponder, assigned by air traffic control or prescribed for a specific contingency, to identify the aircraft on radar displays.

A radio transmission stating an aircraft's location, altitude, and intentions at a specified point, used to keep other traffic and ground stations informed.

The traffic circuit segment flown parallel to the runway in the direction opposite to landing, normally where pre-landing checks and radio calls are made.

The last circuit segment, aligned with the landing direction and descending to touchdown, where configuration, speed, and glidepath are stabilised.

Spinning up the rotor before takeoff using the engine, a mechanical drive, or airflow, so that sufficient rotor speed exists to support flight after release.

A takeoff technique in which the rotor is driven to above-flight RPM and then disengaged, allowing the gyroplane to climb vertically or near-vertically before forward speed develops.

The rotational speed of the main rotor, typically expressed in revolutions per minute; too low causes blade stall and too high risks structural or aerodynamic limits.

The distance travelled along the surface from brake release until the aircraft lifts off, influenced by weight, density altitude, wind, and surface condition.

The total distance required from the start of the takeoff roll to reaching a specified height above the surface, accounting for aircraft mass and atmospheric conditions.

Pressure altitude corrected for non-standard temperature; higher values reduce lift and engine power, lengthening takeoff and landing distances and reducing climb performance.

The state in which the rotor is driven by upward airflow through the disc rather than by engine power, allowing controlled descent after an engine failure.

The ratio of aircraft weight to the area of the rotor disc; higher values generally require greater power and produce faster descent rates in autorotation.

Upward and downward motion of each rotor blade about its flapping hinge, balancing lift asymmetries caused by forward airspeed and allowing the disc to tilt.

The imbalance in lift between advancing and retreating blades created by forward airspeed, which flapping and blade pitch changes compensate for.

A progressive backward control input used near the ground to raise the nose, slow the aircraft, and trade forward speed for a gentler touchdown or reduced descent rate.

The airspeed selected for the final approach and landing, usually a margin above minimum safe speed to allow for gusts, turbulence, and control response.

The point through which the aircraft's total weight acts; its position relative to the rotor thrust line strongly affects pitch stability and control forces.

The tendency of a gyroplane to return toward equilibrium because the centre of gravity hangs below the rotor thrust line, producing a restoring moment.

The initial tendency of an aircraft, after disturbance, to return toward its original attitude, diverge further, or remain neutral, assessed without considering oscillation.

The behaviour of an aircraft over time after a disturbance, describing whether oscillations decay, remain constant, or grow in amplitude.

A dangerous pitch divergence in which high engine thrust, combined with a low centre of gravity and inadequate horizontal stabiliser, drives the rotor thrust line ahead of the centre of gravity.

The reduction in climb rate and increase in takeoff distance experienced when high elevation, temperature, and humidity lower air density and available power.

A sudden change in wind speed or direction over a short distance, often near the surface, which can cause abrupt airspeed and lift changes on approach or departure.

Wind measured at the aerodrome surface, reported as direction and speed; it determines takeoff and landing direction and affects ground roll and drift.

The pressure value entered into the altimeter so that it indicates elevation or altitude relative to a chosen datum, such as aerodrome elevation or sea level.

A navigation method computing position from a known starting point using heading, airspeed, wind, and elapsed time, without reference to external position fixes.

The direction in which the aircraft's longitudinal axis points, expressed in degrees from north and distinct from track, which includes wind drift.

A standard set of spoken words assigned to letters, used in radiotelephony to spell out identifiers and avoid confusion between similar-sounding letters.

The repetition by a pilot of an air traffic control clearance or instruction to confirm it was received and understood correctly.