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Abbreviation for: height above aerodrome



Abbreviation for: height above landing



The process of transferring the radar identification of an aircraft target and radio communications for that aircraft to another controller to ensure the uninterrupted provision of radar service.

Fr: transfert

hang glider

A motorless heavier-than-air aircraft deriving its lift from surfaces that remain fixed in flight, designed to carry not more than two persons and having a launch weight of 45 kg (99.2 lb) or less.

Fr: aile libre


Abbreviation for: height above touchdown


“Have numbers”

An expression used by pilots to indicate that they have received runway, wind and altimeter information only.

Fr: « J’ai l’information »

Hazardous Inflight Weather Advisory Service

U.S.: Continuous recorded hazardous inflight weather forecasts broadcasted to airborne pilots over selected VHF omnidirectional range (VOR) outlets defined as an HIWAS Broadcast Area.

  • abbreviation: HIWAS
hazardous situation

In ATS usage, an occurrence in which flight safety was jeopardized.

Fr: situation dangereuse


Abbreviation for: heading



The direction in which the longitudinal axis of an aircraft is pointed, usually expressed in degrees from north (true, magnetic, compass or grid north).

  • abbreviation: HDG

Fr: cap

heavier-than-air aircraft

An aircraft supported in the atmosphere by lift derived from aerodynamic forces.

Fr: aérodyne

height above aerodrome

The height in feet of the minimum descent altitude (MDA) above the published aerodrome elevation.

  • abbreviation: HAA

Fr: hauteur au-dessus de l’aérodrome

height above landing

The height above a designated helicopter landing area used for helicopter instrument approach procedures (IAP).

  • abbreviation: HAL

Fr: hauteur au-dessus de l’aire d’atterrissage

height above touchdown

Other expression for: height above touchdown zone elevation

  • abbreviation: HAT
height above touchdown zone

Other expression for: height above touchdown zone elevation

height above touchdown zone elevation

The height in feet of the decision height (DH) or minimum descent altitude (MDA) above the touchdown zone elevation (TDZE).

  • also called: height above touchdown (HAT), height above touchdown zone

Fr: hauteur au-dessus de la zone de poser


A power-driven heavier-than-air aircraft that derives its lift in flight from aerodynamic reactions on one or more power-driven rotors on substantially vertical axes.

Fr: hélicoptère

helicopter parking position
A part of the apron designated for the touchdown and parking of helicopters that have taxied from a final approach and takeoff area (FATO), runway or another part of the aerodrome.

Fr: poste de stationnement d’hélicoptère

helicopter stand
ICAO: other expression for: helicopter parking position

A designated area, usually with a prepared surface, used for the takeoff, landing, or parking of helicopters.

Fr: hélisurface


An aerodrome used or intended to be used for the arrival, landing, takeoff or departure of vertical takeoff and landing aircraft (VTOL).

Fr: héliport


Abbreviation for: high frequency

Fr: HF

high frequency

The frequency band between 3 and 30 MHz.

  • abbreviation: HF

Fr: haute fréquence

high intensity runway operations

Operations, used at very busy airports, that consist of optimizing separation of aircraft in final approach in order to minimize runway occupancy time (ROT) for both arriving and departing aircraft and to increase runway capacity.

  • abbreviation: HIRO

Fr: opérations sur pistes très achalandées

high level air route

In high level airspace (HLA), a prescribed track between specified fixes.

Note: On aeronautical charts, high level air routes are indicated by letters such as “T” or “NAT.”

Fr: route aérienne de l’espace supérieur

high level airspace

All airspace within the Canadian Domestic Airspace (CDA) at or above 18 000 ft ASL.

  • abbreviation: HLA

Fr: espace aérien supérieur

high level airway

In controlled high level airspace (HLA), a prescribed track between specified fixes.

Note: On aeronautical charts, high level airways are indicated by the letter “J” (e.g. J500).

Fr: voie aérienne de l’espace supérieur

high level fixed RNAV route

In high level airspace (HLA), a prescribed area navigation track between specified fixes.

Fr: route RNAV fixe de l’espace aérien supérieur

high speed exit

Other expression for: high speed taxiway

high speed taxiway

A long-radius taxiway designed and provided with lighting or marking to define the path of aircraft, travelling at high speed (up to 60 kt), from the runway centre to a point on the centre of a taxiway. The high speed taxiway is designed to expedite aircraft turning off the runway after landing, thus reducing runway occupancy time.

  • also called: high speed exit, high speed turnoff, long radius exit, rapid exit taxiway, turnoff taxiway

Fr: voie de sortie rapide

high speed turnoff

Other expression for: high speed taxiway


Other expression for: acts of unlawful interference

hire or reward

Any payment, consideration, gratuity or benefit directly or indirectly charged, demanded, received or collected by any person for the use of an aircraft.

Fr: rémunération


Abbreviation for: high intensity runway operations



U.S.: Abbreviation for: Hazardous Inflight Weather Advisory Service


Abbreviation for: high level airspace


holding area

The airspace to be protected for holding aircraft in accordance with ATC holding criteria.

Fr: zone d’attente

holding fix

A specified location, identified by visual or other means, in the vicinity of which the position of an aircraft in flight is maintained in accordance with ATC clearances.

Fr: repère d’attente

holding pattern

(1) A predetermined racetrack pattern flown as part of a holding procedure.

Fr: circuit d’attente

(2) U.S.: Expression for: holding procedure

“holding point”

ICAO: Expression for: runway-holding position

holding procedure

A predetermined manoeuvre that keeps an aircraft within a specified airspace while it awaits further clearance.

Fr: procédure d’attente

holding stack

A number of aircraft holding at a common fix with vertical separation.

  • also called: stack

Fr: pile d’attente

“Hold short”

Instructions to hold at least 200 ft from the edge of a runway while awaiting permission to cross or proceed onto a runway, unless other holding positions are established by the aerodrome operator.

Fr: « Attendez à l’écart »


(1) The procedure of using the direction-finding equipment of one radio station with the emission of another radio station, where at least one of the stations is mobile, and whereby the mobile station proceeds continuously towards the other station.

Fr: radioralliement

(2) U.S.: Flight towards a NAVAID, without correcting for wind, by adjusting the aircraft heading to maintain a relative bearing of zero degrees.

hover check

An expression used to describe the situation when a helicopter or vertical takeoff and landing aircraft (VTOL) requires a stabilized hover to conduct a performance or power check prior to hover taxi, air taxi or takeoff. The altitude of the hover will vary based on the purpose of the check.

Fr: vérification en vol stationnaire

hover taxi

U.S. and Canada: The movement of a helicopter or vertical takeoff and landing aircraft (VTOL) above the surface of an aerodrome and in ground effect at airspeeds less than approximately 20 kt. 

Note: One of the two terms encompassed by ICAO’s term air-taxiing.

Fr: circulation près du sol

“How do you read?”

An expression used in radiocommunication meaning “What is the readability of my transmission?”

Fr: « Comment recevez-vous? »
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