ADIRS-1 non operativo
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.
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ADIRU di riserva
Independent backup ADIRU providing attitude, heading, and air-data when primary systems are degraded or failed.
View termAttrezzature e Arredi Non Essenziali
Equipment and furnishings that are not required for safe operation or regulatory compliance and may be inoperative without affecting dispatch eligibility.
View termAvaria valvola anti-ghiaccio
Malfunction of wing or engine anti-ice valve preventing hot-air flow, compromising ice protection and requiring flight profile adjustment.
View termAvviamento Motore in Volo
The procedure of starting an engine during flight, often due to engine flameout or following maintenance.
View termazione correttiva
The specific maintenance or operational step taken to resolve a defect, discrepancy, or deferred item as documented in the logbook or MEL.
View termBollettino di servizio in sospeso
Manufacturer’s recommended modification or inspection not yet incorporated; outstanding action listed in maintenance records.
View termCambio programmato di componente
Pre-planned replacement of a part or system component at a specified interval or due time according to maintenance schedule.
View termCambio programmato di componente
Pre-planned replacement of an aircraft component at specific intervals in accordance with the maintenance schedule.
View termcartello
An official sign or label installed in the cockpit or cabin to indicate equipment limitations, status, or required procedures per MEL or CDL.
View termcategoria 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 termcategoria B
A Minimum Equipment List category requiring rectification of an inoperative item within three consecutive calendar days, excluding the day of discovery.
View termcategoria C
A Minimum Equipment List category requiring rectification of an inoperative item within ten consecutive calendar days, excluding the day of discovery.
View termcategoria D
A Minimum Equipment List category requiring rectification of an inoperative item within 120 consecutive calendar days, excluding the day of discovery.
View termCentro controllo manutenzione
Centralized department overseeing aircraft technical status, defect clearance, and authorizing maintenance actions and MEL deferrals.
View termConsumo rifornito
A maintenance log entry confirming replenishment of expendable items such as oil, hydraulic fluid, or oxygen.
View termControllo azione differita
Cockpit switch or placard indicating an MEL-approved deferred maintenance item that must not be activated in flight.
View termControllo fuori fase
Maintenance inspection not aligned with normal cycle, scheduled according to special interval or condition.
View termCopertura pitot installata
Protective pitot-tube cover still fitted, blocking dynamic-pressure input and rendering airspeed indications unreliable.
View termDecollo Bleed-Off
A take-off performed with engine bleed air turned off to optimize thrust, typically when performance-limited.
View termDeviazione bussola
Error between magnetic compass indication and actual magnetic heading exceeding permissible limits; requires calibration swing.
View termDeviazione di Configurazione
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 termdeviazione di dispatch
An authorized variation from standard aircraft configuration or equipment status, documented for legal dispatch of a flight.
View termDifetto Annotato nel Registro Cabina
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 termdifferimento
A formal process allowing a non-essential inoperative item to be left unrepaired for a specified time under MEL/CDL limits.
View termDirettiva campagna flotta
Mandatory maintenance or modification order issued by the operator or manufacturer, applicable to an entire fleet.
View termDirettiva di aeronavigabilità registrata
Mandatory compliance record entered in technical log documenting completion of authority-issued safety directive.
View termDispatch con Unità di Potenza Ausiliaria
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 termDispositivo di respirazione protettiva mancante
Required PBE smoke-hood absent from crew station or galley, violating safety regulations until replaced.
View termelemento non autorizzato
An inoperative or missing item which, according to MEL or regulatory requirements, prevents the aircraft from being legally dispatched.
View termelemento ripetuto
A recurring defect or observation required to be checked, recorded, or repeated at intervals specified in the MEL or logbook.
View termequipaggiamenti e arredi non essenziali
Equipment or furnishings that are not essential for the airworthiness or safety of the flight and may be deferred.
View termequipaggiamento minimo
The essential items that must be serviceable for an aircraft to be dispatched under the MEL; if not available, flight is not permitted.
View termGeneratore ausiliario inoperativo
Aircraft auxiliary power unit (APU) generator not providing electrical power, requiring external source for ground operations and start.
View termGiubbotto di salvataggio mancante
Required passenger flotation device absent from its assigned seat location, rendering that position unserviceable until replaced in accordance with the MEL.
View termGruppo di Condizionamento Inoperativo
Indicates a failure of an air-conditioning pack, possibly affecting cabin pressurization and requiring MEL compliance before dispatch.
View termGuasto al Transponder
The aircraft’s transponder is not transmitting, impacting radar identification and requiring ATC notification and alternate procedures.
View termInterfono inoperativo
Internal crew communication system not functioning, affecting cockpit-cabin coordination and triggering MEL action.
View termintervallo di riparazione
The maximum period permitted by the MEL for rectifying an inoperative item before mandatory maintenance is required.
View termInvertitore di Spinta Inoperativo
The thrust reverser mechanism cannot be deployed, requiring alternative braking methods and possibly affecting landing performance.
View termIspezione in scadenza
Notification that a scheduled inspection interval will be reached within a short time frame, requiring planning.
View termLimitazione di dispatch
Restrictive condition under which an aircraft may be dispatched due to system defect or MEL, affecting allowable operation.
View termlista delle deviazioni di configurazione
An official document specifying permissible aircraft configuration deviations that do not affect safe flight, used for dispatch with non-standard configurations.
View termLista Minima Attrezzature ETOPS
The Minimum Equipment List applicable to extended-range (ETOPS) flights, specifying the minimum required equipment for oceanic and remote area operations.
View termLista Minima Attrezzature Operatore
The MEL approved by the state of the operator, tailored to specific airline operations, listing minimum equipment required for dispatch.
View termLista Minima delle Attrezzature
An approved document listing the minimum equipment required for safe operation of an aircraft, permitting specified inoperative items under controlled conditions.
View termMonitoraggio delle condizioni
Ongoing process of assessing system or component health through data and trend analysis to guide maintenance decisions.
View termNota impatto operativo
Written record in technical log noting operational effects or limitations resulting from an aircraft defect, MEL, or deferred item.
View termnumero di controllo
A unique identifier assigned to a deferred defect, MEL/CDL item, or maintenance entry for tracking and compliance.
View termOrdine tecnico applicato
Formal modification or repair directive implemented and documented by engineering, referenced in aircraft technical records.
View termParti in attesa di fornitura
Maintenance action deferred because required replacement part is not yet available in inventory or supply chain.
View termPenalità di Peso
An increase in operational weight or a reduction in allowable weight imposed due to specific inoperative equipment or configuration deviations.
View termPenalità di Prestazione
A reduction in aircraft performance, such as climb, takeoff, or landing, resulting from inoperative systems or configuration deviations.
View termPermesso volo ferry
Authority granted to reposition an aircraft without revenue passengers, often under MEL limitations, to maintenance or delivery point.
View termProcedura alternativa richiesta
Standard operating sequence unavailable; crew must follow officially published alternate or contingency checklist.
View termprocedura di manutenzione
A required action by maintenance personnel to address an MEL/CDL item, often prerequisite for dispatch or rectification.
View termprocedura operativa
A mandatory action or set of actions required by flight crew to safely operate an aircraft system, especially with an MEL/CDL item.
View termProroga intervallo rettifica
Formal approval to extend the allowable period for repair of a deferred defect beyond original MEL interval.
View termQuantità Idraulica Bassa
Indicates that the fluid level in a hydraulic reservoir is below the specified minimum for safe system operation.
View termRadio VHF 1 Inoperativa
Primary VHF radio channel 1 is not functional, requiring use of alternate radio or backup for ATC communications.
View termrapporto difetto differito
A formal record noting a defect which has been deferred under MEL/CDL procedures, including details of rectification plan and interval.
View termRapporto difetto equipaggio volo
Written logbook entry by flight crew describing observed technical defect or malfunction requiring maintenance action.
View termRapporto difficoltà servizio
Official report filed to aviation authority documenting significant aircraft/system in-service malfunction, defect, or repeated failure.
View termRegistrazione di Lavoro Non Ordinario
A maintenance log entry documenting unscheduled or unexpected technical issues or discrepancies detected during aircraft operations, requiring attention beyond regular or planned maintenance.
View termRegolatore pressione cabina 1 inoperativo
Primary automatic pressurization channel failed; crew managing cabin differential in manual mode per QRH procedures.
View termRevisione Procedurale Provvisoria
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 termRichiesto troubleshooting
Further diagnostic action needed to isolate cause of technical fault or failure not resolved by initial inspection.
View termRiferimento capitolo ATA
Standardized reference number identifying aircraft system/component according to the ATA 100/2200 maintenance coding system.
View termRiferimento scheda lavoro
Unique identifier of a maintenance work card specifying approved procedures for inspection, repair, or modification.
View termRilascio certificato al servizio
Formal written declaration by licensed engineer that aircraft or component is airworthy and fit for return to operation.
View termScheda attività completata
Documented evidence that all steps of an assigned maintenance task card have been performed and signed off.
View termScheda Tecnica di Pronto Volo
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 termScivolo di evacuazione inoperativo
Inflatable escape slide at an aircraft door unserviceable, precluding passenger carriage until rectified or deferred per MEL.
View termSedile equipaggio inoperativo
Flight-deck seat fails to lock, adjust, or retract, potentially compromising crew safety and requiring MEL evaluation.
View termSistema Antislittamento Inoperativo
A condition where the antiskid braking system is not operational, requiring alternate braking procedures and possible performance penalties.
View termSpoiler Disattivato
A system status where one or more spoiler panels are intentionally or automatically rendered inoperative for the flight.
View termStoppino statico mancante
Static electricity discharge wick absent from wing or control surface, potentially increasing radio interference until replaced.
View termTest funzionale richiesto
Indicates requirement for an operational or systems test to confirm correct function of a repaired or replaced item.
View termUsura dei Freni
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 termvoce del registro di bordo
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 termVoce della Lista Deviazioni di Configurazione
An entry in the Configuration Deviation List authorizing dispatch with specific external or configuration deviations, within specified limitations.
View termVoce della Lista Deviazioni di Configurazione
An authorized deviation from aircraft configuration detailed in the Configuration Deviation List, permitting dispatch with specific missing or inoperative external parts.
View termvoli consecutivi
A sequence of successive flights where certain MEL/CDL items may remain deferred or require repeated checks as specified.
View termVolo di controllo manutenzione
Post-maintenance air test conducted to verify aircraft performance and systems before return to commercial service.
View term