ADIRS-1不作動
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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ATAチャプター参照
Standardized reference number identifying aircraft system/component according to the ATA 100/2200 maintenance coding system.
View termETOPS最低装備品リスト
The Minimum Equipment List applicable to extended-range (ETOPS) flights, specifying the minimum required equipment for oceanic and remote area operations.
View termVHF無線機1不作動
Primary VHF radio channel 1 is not functional, requiring use of alternate radio or backup for ATC communications.
View termまもなく点検時期
Notification that a scheduled inspection interval will be reached within a short time frame, requiring planning.
View termアンチスキッドシステム不作動
A condition where the antiskid braking system is not operational, requiring alternate braking procedures and possible performance penalties.
View termインターフォン不作動
Internal crew communication system not functioning, affecting cockpit-cabin coordination and triggering MEL action.
View termエンジニアリングオーダー適用済み
Formal modification or repair directive implemented and documented by engineering, referenced in aircraft technical records.
View termカテゴリー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 termカテゴリーB
A Minimum Equipment List category requiring rectification of an inoperative item within three consecutive calendar days, excluding the day of discovery.
View termカテゴリーC
A Minimum Equipment List category requiring rectification of an inoperative item within ten consecutive calendar days, excluding the day of discovery.
View termカテゴリーD
A Minimum Equipment List category requiring rectification of an inoperative item within 120 consecutive calendar days, excluding the day of discovery.
View termキャビンプレッシャーコントローラー1不作動
Primary automatic pressurization channel failed; crew managing cabin differential in manual mode per QRH procedures.
View termキャビンログ欠陥
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 termクルーシート不作動
Flight-deck seat fails to lock, adjust, or retract, potentially compromising crew safety and requiring MEL evaluation.
View termコンパス偏差
Error between magnetic compass indication and actual magnetic heading exceeding permissible limits; requires calibration swing.
View termサービスブリテン保留中
Manufacturer’s recommended modification or inspection not yet incorporated; outstanding action listed in maintenance records.
View termサービス困難レポート
Official report filed to aviation authority documenting significant aircraft/system in-service malfunction, defect, or repeated failure.
View termスタティックウィック欠品
Static electricity discharge wick absent from wing or control surface, potentially increasing radio interference until replaced.
View termスタンバイADIRU
Independent backup ADIRU providing attitude, heading, and air-data when primary systems are degraded or failed.
View termスポイラー非作動
A system status where one or more spoiler panels are intentionally or automatically rendered inoperative for the flight.
View termスラストリバーサー不作動
The thrust reverser mechanism cannot be deployed, requiring alternative braking methods and possibly affecting landing performance.
View termタスクカード完了
Documented evidence that all steps of an assigned maintenance task card have been performed and signed off.
View termテクニカルディスパッチシート
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 termディスパッチ逸脱
An authorized variation from standard aircraft configuration or equipment status, documented for legal dispatch of a flight.
View termトラブルシューティング必要
Further diagnostic action needed to isolate cause of technical fault or failure not resolved by initial inspection.
View termトランスポンダ故障
The aircraft’s transponder is not transmitting, impacting radar identification and requiring ATC notification and alternate procedures.
View termピトーカバー装着中
Protective pitot-tube cover still fitted, blocking dynamic-pressure input and rendering airspeed indications unreliable.
View termフェリーフライト許可
Authority granted to reposition an aircraft without revenue passengers, often under MEL limitations, to maintenance or delivery point.
View termフリートキャンペーン指令
Mandatory maintenance or modification order issued by the operator or manufacturer, applicable to an entire fleet.
View termブリードオフ離陸
A take-off performed with engine bleed air turned off to optimize thrust, typically when performance-limited.
View termブレーキ摩耗
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 termメンテナンスコントロールセンター
Centralized department overseeing aircraft technical status, defect clearance, and authorizing maintenance actions and MEL deferrals.
View termメンテナンスチェックフライト
Post-maintenance air test conducted to verify aircraft performance and systems before return to commercial service.
View termライフベスト欠品
Required passenger flotation device absent from its assigned seat location, rendering that position unserviceable until replaced in accordance with the MEL.
View termログブック記録
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 term乗員不具合レポート
Written logbook entry by flight crew describing observed technical defect or malfunction requiring maintenance action.
View term代替手順必要
Standard operating sequence unavailable; crew must follow officially published alternate or contingency checklist.
View term作業カード参照番号
Unique identifier of a maintenance work card specifying approved procedures for inspection, repair, or modification.
View term保護呼吸装置欠品
Required PBE smoke-hood absent from crew station or galley, violating safety regulations until replaced.
View term修理間隔
The maximum period permitted by the MEL for rectifying an inoperative item before mandatory maintenance is required.
View term再実施項目
A recurring defect or observation required to be checked, recorded, or repeated at intervals specified in the MEL or logbook.
View term出発不可項目
An inoperative or missing item which, according to MEL or regulatory requirements, prevents the aircraft from being legally dispatched.
View term出発制限
Restrictive condition under which an aircraft may be dispatched due to system defect or MEL, affecting allowable operation.
View term定期部品交換
Pre-planned replacement of a part or system component at a specified interval or due time according to maintenance schedule.
View term定期部品交換
Pre-planned replacement of an aircraft component at specific intervals in accordance with the maintenance schedule.
View term延期
A formal process allowing a non-essential inoperative item to be left unrepaired for a specified time under MEL/CDL limits.
View term延期不具合報告
A formal record noting a defect which has been deferred under MEL/CDL procedures, including details of rectification plan and interval.
View term延期処置スイッチ
Cockpit switch or placard indicating an MEL-approved deferred maintenance item that must not be activated in flight.
View term性能ペナルティ
A reduction in aircraft performance, such as climb, takeoff, or landing, resulting from inoperative systems or configuration deviations.
View term整備士合格証明（サービス再開）
Formal written declaration by licensed engineer that aircraft or component is airworthy and fit for return to operation.
View term整備手順
A required action by maintenance personnel to address an MEL/CDL item, often prerequisite for dispatch or rectification.
View term是正措置
The specific maintenance or operational step taken to resolve a defect, discrepancy, or deferred item as documented in the logbook or MEL.
View term是正間隔延長
Formal approval to extend the allowable period for repair of a deferred defect beyond original MEL interval.
View term暫定手順改訂
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 term最低装備品リスト
An approved document listing the minimum equipment required for safe operation of an aircraft, permitting specified inoperative items under controlled conditions.
View term最小装備
The essential items that must be serviceable for an aircraft to be dispatched under the MEL; if not available, flight is not permitted.
View term構成逸脱
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 term構成逸脱リスト
An official document specifying permissible aircraft configuration deviations that do not affect safe flight, used for dispatch with non-standard configurations.
View term構成逸脱リスト項目
An entry in the Configuration Deviation List authorizing dispatch with specific external or configuration deviations, within specified limitations.
View term構成逸脱リスト項目
An authorized deviation from aircraft configuration detailed in the Configuration Deviation List, permitting dispatch with specific missing or inoperative external parts.
View term機能テスト必要
Indicates requirement for an operational or systems test to confirm correct function of a repaired or replaced item.
View term油圧量低下
Indicates that the fluid level in a hydraulic reservoir is below the specified minimum for safe system operation.
View term消耗品補充済み
A maintenance log entry confirming replenishment of expendable items such as oil, hydraulic fluid, or oxygen.
View term状態監視
Ongoing process of assessing system or component health through data and trend analysis to guide maintenance decisions.
View term空調パック不作動
Indicates a failure of an air-conditioning pack, possibly affecting cabin pressurization and requiring MEL compliance before dispatch.
View term管理番号
A unique identifier assigned to a deferred defect, MEL/CDL item, or maintenance entry for tracking and compliance.
View term耐空性指令記録済み
Mandatory compliance record entered in technical log documenting completion of authority-issued safety directive.
View term脱出スライド不作動
Inflatable escape slide at an aircraft door unserviceable, precluding passenger carriage until rectified or deferred per MEL.
View term表示板
An official sign or label installed in the cockpit or cabin to indicate equipment limitations, status, or required procedures per MEL or CDL.
View term補助動力装置でのディスパッチ
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 term補助発電機不作動
Aircraft auxiliary power unit (APU) generator not providing electrical power, requiring external source for ground operations and start.
View term連続便
A sequence of successive flights where certain MEL/CDL items may remain deferred or require repeated checks as specified.
View term運用手順
A mandatory action or set of actions required by flight crew to safely operate an aircraft system, especially with an MEL/CDL item.
View term運航影響ノート
Written record in technical log noting operational effects or limitations resulting from an aircraft defect, MEL, or deferred item.
View term運航者最低装備品リスト
The MEL approved by the state of the operator, tailored to specific airline operations, listing minimum equipment required for dispatch.
View term部品供給待ち
Maintenance action deferred because required replacement part is not yet available in inventory or supply chain.
View term重量ペナルティ
An increase in operational weight or a reduction in allowable weight imposed due to specific inoperative equipment or configuration deviations.
View term防氷バルブ故障
Malfunction of wing or engine anti-ice valve preventing hot-air flow, compromising ice protection and requiring flight profile adjustment.
View term非周期点検
Maintenance inspection not aligned with normal cycle, scheduled according to special interval or condition.
View term非定型作業記録
A maintenance log entry documenting unscheduled or unexpected technical issues or discrepancies detected during aircraft operations, requiring attention beyond regular or planned maintenance.
View term非必須機器および備品
Equipment or furnishings that are not essential for the airworthiness or safety of the flight and may be deferred.
View term非必須機器および備品
Equipment and furnishings that are not required for safe operation or regulatory compliance and may be inoperative without affecting dispatch eligibility.
View term飛行中エンジン始動
The procedure of starting an engine during flight, often due to engine flameout or following maintenance.
View term