ADIRS-1 hors service
Primary ADIRS channel 1 failed; aircraft relying on remaining or standby navigation sources in accordance with MEL.
View termCategories
MEL and CDL MEL and CDL
Browse MEL and CDL MEL and CDL terms for pilots, air traffic controllers, cabin crew and aviation learners.
Languages
ADIRU de secours
Independent backup ADIRU providing attitude, heading, and air-data when primary systems are degraded or failed.
View termApprobation de remise en service
Formal written declaration by licensed engineer that aircraft or component is airworthy and fit for return to operation.
View termAutorisation vol de convoyage
Authority granted to reposition an aircraft without revenue passengers, often under MEL limitations, to maintenance or delivery point.
View termBulletin de service en attente
Manufacturer’s recommended modification or inspection not yet incorporated; outstanding action listed in maintenance records.
View termCache pitot installé
Protective pitot-tube cover still fitted, blocking dynamic-pressure input and rendering airspeed indications unreliable.
View termcatégorie A
A Minimum Equipment List category requiring rectification of an inoperative item within a time period specified in the MEL, usually before next flight.
View termcatégorie B
A Minimum Equipment List category requiring rectification of an inoperative item within three consecutive calendar days, excluding the day of discovery.
View termcatégorie C
A Minimum Equipment List category requiring rectification of an inoperative item within ten consecutive calendar days, excluding the day of discovery.
View termcatégorie D
A Minimum Equipment List category requiring rectification of an inoperative item within 120 consecutive calendar days, excluding the day of discovery.
View termCentre de contrôle maintenance
Centralized department overseeing aircraft technical status, defect clearance, and authorizing maintenance actions and MEL deferrals.
View termChangement de composant programmé
Pre-planned replacement of a part or system component at a specified interval or due time according to maintenance schedule.
View termChangement de composant programmé
Pre-planned replacement of an aircraft component at specific intervals in accordance with the maintenance schedule.
View termCommande action différée
Cockpit switch or placard indicating an MEL-approved deferred maintenance item that must not be activated in flight.
View termConsommable réapprovisionné
A maintenance log entry confirming replenishment of expendable items such as oil, hydraulic fluid, or oxygen.
View termContrôle hors phase
Maintenance inspection not aligned with normal cycle, scheduled according to special interval or condition.
View termDirective de campagne flotte
Mandatory maintenance or modification order issued by the operator or manufacturer, applicable to an entire fleet.
View termDirective de navigabilité enregistrée
Mandatory compliance record entered in technical log documenting completion of authority-issued safety directive.
View termDécollage Bleed-Off
A take-off performed with engine bleed air turned off to optimize thrust, typically when performance-limited.
View termDéfaillance du Transpondeur
The aircraft’s transponder is not transmitting, impacting radar identification and requiring ATC notification and alternate procedures.
View termDéfaillance vanne anti-givre
Malfunction of wing or engine anti-ice valve preventing hot-air flow, compromising ice protection and requiring flight profile adjustment.
View termDéfaut Consigné au Carnet de Bord Cabine
A discrepancy, malfunction, or abnormality reported by crew and recorded in the aircraft cabin log for maintenance attention, typically affecting passenger or crew services and requiring rectification before or after flight.
View termdélai de réparation
The maximum period permitted by the MEL for rectifying an inoperative item before mandatory maintenance is required.
View termDémarrage Moteur en Vol
The procedure of starting an engine during flight, often due to engine flameout or following maintenance.
View termDépannage requis
Further diagnostic action needed to isolate cause of technical fault or failure not resolved by initial inspection.
View termDépart avec Groupe Auxiliaire de Puissance
Authorization for a flight to dispatch with the Auxiliary Power Unit (APU) operating or required, usually due to ground power limitations or MEL stipulations.
View termDéviation compas
Error between magnetic compass indication and actual magnetic heading exceeding permissible limits; requires calibration swing.
View termDéviation de Configuration
A formally approved variation from the aircraft’s standard configuration as specified in the Configuration Deviation List (CDL), which may permit flight with certain external parts missing or inoperative.
View termentrée de carnet de bord
A formal record in the aircraft technical log documenting the status, action, or deferral of an MEL/CDL item for legal and maintenance tracking.
View termEntrée de Travail Non-Routine
A maintenance log entry documenting unscheduled or unexpected technical issues or discrepancies detected during aircraft operations, requiring attention beyond regular or planned maintenance.
View termFiche de tâche achevée
Documented evidence that all steps of an assigned maintenance task card have been performed and signed off.
View termFiche Technique de Départ
A formal document or electronic record certifying an aircraft’s airworthiness and readiness for flight after maintenance actions or inspections, required to be completed and signed by authorized personnel before each departure.
View termGilet de sauvetage manquant
Required passenger flotation device absent from its assigned seat location, rendering that position unserviceable until replaced in accordance with the MEL.
View termGroupe Climatisation Inopérant
Indicates a failure of an air-conditioning pack, possibly affecting cabin pressurization and requiring MEL compliance before dispatch.
View termGénérateur auxiliaire inopérant
Aircraft auxiliary power unit (APU) generator not providing electrical power, requiring external source for ground operations and start.
View termInspection à venir
Notification that a scheduled inspection interval will be reached within a short time frame, requiring planning.
View termInstruction d’ingénierie appliquée
Formal modification or repair directive implemented and documented by engineering, referenced in aircraft technical records.
View termInterphone inopérant
Internal crew communication system not functioning, affecting cockpit-cabin coordination and triggering MEL action.
View termInverseur de Poussée Inopérant
The thrust reverser mechanism cannot be deployed, requiring alternative braking methods and possibly affecting landing performance.
View termLimitation d’expédition
Restrictive condition under which an aircraft may be dispatched due to system defect or MEL, affecting allowable operation.
View termliste de déviation de configuration
An official document specifying permissible aircraft configuration deviations that do not affect safe flight, used for dispatch with non-standard configurations.
View termListe Minimale d'Équipement
An approved document listing the minimum equipment required for safe operation of an aircraft, permitting specified inoperative items under controlled conditions.
View termListe Minimale d'Équipement de l'Exploitant
The MEL approved by the state of the operator, tailored to specific airline operations, listing minimum equipment required for dispatch.
View termListe Minimale d'Équipement ETOPS
The Minimum Equipment List applicable to extended-range (ETOPS) flights, specifying the minimum required equipment for oceanic and remote area operations.
View termmesure corrective
The specific maintenance or operational step taken to resolve a defect, discrepancy, or deferred item as documented in the logbook or MEL.
View termMèche statique manquante
Static electricity discharge wick absent from wing or control surface, potentially increasing radio interference until replaced.
View termNote d’impact opérationnel
Written record in technical log noting operational effects or limitations resulting from an aircraft defect, MEL, or deferred item.
View termnuméro de contrôle
A unique identifier assigned to a deferred defect, MEL/CDL item, or maintenance entry for tracking and compliance.
View termPièces en attente d’approvisionnement
Maintenance action deferred because required replacement part is not yet available in inventory or supply chain.
View termplaque signalétique
An official sign or label installed in the cockpit or cabin to indicate equipment limitations, status, or required procedures per MEL or CDL.
View termProcédure alternative requise
Standard operating sequence unavailable; crew must follow officially published alternate or contingency checklist.
View termprocédure de maintenance
A required action by maintenance personnel to address an MEL/CDL item, often prerequisite for dispatch or rectification.
View termprocédure opérationnelle
A mandatory action or set of actions required by flight crew to safely operate an aircraft system, especially with an MEL/CDL item.
View termProlongation d’intervalle de rectification
Formal approval to extend the allowable period for repair of a deferred defect beyond original MEL interval.
View termPénalité de Performance
A reduction in aircraft performance, such as climb, takeoff, or landing, resulting from inoperative systems or configuration deviations.
View termPénalité de Poids
An increase in operational weight or a reduction in allowable weight imposed due to specific inoperative equipment or configuration deviations.
View termQuantité Hydraulique Faible
Indicates that the fluid level in a hydraulic reservoir is below the specified minimum for safe system operation.
View termRadio VHF 1 Inopérante
Primary VHF radio channel 1 is not functional, requiring use of alternate radio or backup for ATC communications.
View termRapport de difficulté de service
Official report filed to aviation authority documenting significant aircraft/system in-service malfunction, defect, or repeated failure.
View termRapport de défaut de l’équipage de conduite
Written logbook entry by flight crew describing observed technical defect or malfunction requiring maintenance action.
View termrapport de défaut différé
A formal record noting a defect which has been deferred under MEL/CDL procedures, including details of rectification plan and interval.
View termreport
A formal process allowing a non-essential inoperative item to be left unrepaired for a specified time under MEL/CDL limits.
View termRéférence chapitre ATA
Standardized reference number identifying aircraft system/component according to the ATA 100/2200 maintenance coding system.
View termRéférence fiche de travail
Unique identifier of a maintenance work card specifying approved procedures for inspection, repair, or modification.
View termRégulateur de pression cabine 1 inopérant
Primary automatic pressurization channel failed; crew managing cabin differential in manual mode per QRH procedures.
View termRévision Procédurale Provisoire
A temporary update to operational or maintenance procedures, issued before the next official revision, to address urgent safety, regulatory, or operational requirements. Used in documentation and flight operations until formal revision is published.
View termSiège équipage inopérant
Flight-deck seat fails to lock, adjust, or retract, potentially compromising crew safety and requiring MEL evaluation.
View termSpoiler Désactivé
A system status where one or more spoiler panels are intentionally or automatically rendered inoperative for the flight.
View termSurveillance de l’état
Ongoing process of assessing system or component health through data and trend analysis to guide maintenance decisions.
View termSystème Antidérapant Inopérant
A condition where the antiskid braking system is not operational, requiring alternate braking procedures and possible performance penalties.
View termTest fonctionnel nécessaire
Indicates requirement for an operational or systems test to confirm correct function of a repaired or replaced item.
View termToboggan d’évacuation inopérant
Inflatable escape slide at an aircraft door unserviceable, precluding passenger carriage until rectified or deferred per MEL.
View termUsure des Freins
The condition in which the aircraft’s brake components have undergone material loss due to repeated use, requiring monitoring and possible replacement if limits are exceeded.
View termVol de contrôle maintenance
Post-maintenance air test conducted to verify aircraft performance and systems before return to commercial service.
View termvols consécutifs
A sequence of successive flights where certain MEL/CDL items may remain deferred or require repeated checks as specified.
View termécart de dispatch
An authorized variation from standard aircraft configuration or equipment status, documented for legal dispatch of a flight.
View termÉlément de Liste de Déviation de Configuration
An entry in the Configuration Deviation List authorizing dispatch with specific external or configuration deviations, within specified limitations.
View termÉlément de Liste de Déviation de Configuration
An authorized deviation from aircraft configuration detailed in the Configuration Deviation List, permitting dispatch with specific missing or inoperative external parts.
View termélément non autorisé au départ
An inoperative or missing item which, according to MEL or regulatory requirements, prevents the aircraft from being legally dispatched.
View termélément à répéter
A recurring defect or observation required to be checked, recorded, or repeated at intervals specified in the MEL or logbook.
View terméquipement minimal
The essential items that must be serviceable for an aircraft to be dispatched under the MEL; if not available, flight is not permitted.
View termÉquipement respiratoire de protection manquant
Required PBE smoke-hood absent from crew station or galley, violating safety regulations until replaced.
View terméquipements et aménagements non essentiels
Equipment or furnishings that are not essential for the airworthiness or safety of the flight and may be deferred.
View termÉquipements et Mobilier Non Essentiels
Equipment and furnishings that are not required for safe operation or regulatory compliance and may be inoperative without affecting dispatch eligibility.
View term