ATA章节编号
Standardized reference number identifying aircraft system/component according to the ATA 100/2200 maintenance coding system.
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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A类
A Minimum Equipment List category requiring rectification of an inoperative item within a time period specified in the MEL, usually before next flight.
View termB类
A Minimum Equipment List category requiring rectification of an inoperative item within three consecutive calendar days, excluding the day of discovery.
View termC类
A Minimum Equipment List category requiring rectification of an inoperative item within ten consecutive calendar days, excluding the day of discovery.
View termD类
A Minimum Equipment List category requiring rectification of an inoperative item within 120 consecutive calendar days, excluding the day of discovery.
View termETOPS最低设备清单
The Minimum Equipment List applicable to extended-range (ETOPS) flights, specifying the minimum required equipment for oceanic and remote area operations.
View term临时程序修订
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任务卡已完成
Documented evidence that all steps of an assigned maintenance task card have been performed and signed off.
View term保护呼吸设备缺失
Required PBE smoke-hood absent from crew station or galley, violating safety regulations until replaced.
View term修理间隔期
The maximum period permitted by the MEL for rectifying an inoperative item before mandatory maintenance is required.
View term关气源起飞
A take-off performed with engine bleed air turned off to optimize thrust, typically when performance-limited.
View term内部通话系统失效
Internal crew communication system not functioning, affecting cockpit-cabin coordination and triggering MEL action.
View term刹车磨损
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即将到期的检查
Notification that a scheduled inspection interval will be reached within a short time frame, requiring planning.
View term反推装置失效
The thrust reverser mechanism cannot be deployed, requiring alternative braking methods and possibly affecting landing performance.
View term合格放行证
Formal written declaration by licensed engineer that aircraft or component is airworthy and fit for return to operation.
View term备用惯性空数基准单元
Independent backup ADIRU providing attitude, heading, and air-data when primary systems are degraded or failed.
View term客舱压力控制器1失效
Primary automatic pressurization channel failed; crew managing cabin differential in manual mode per QRH procedures.
View term客舱日志故障
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工单参考号
Unique identifier of a maintenance work card specifying approved procedures for inspection, repair, or modification.
View term工程指令已执行
Formal modification or repair directive implemented and documented by engineering, referenced in aircraft technical records.
View term应答机故障
The aircraft’s transponder is not transmitting, impacting radar identification and requiring ATC notification and alternate procedures.
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延期缺陷报告
A formal record noting a defect which has been deferred under MEL/CDL procedures, including details of rectification plan and interval.
View term延迟措施控制
Cockpit switch or placard indicating an MEL-approved deferred maintenance item that must not be activated in flight.
View term性能惩罚
A reduction in aircraft performance, such as climb, takeoff, or landing, resulting from inoperative systems or configuration deviations.
View term惯性空数基准系统1失效
Primary ADIRS channel 1 failed; aircraft relying on remaining or standby navigation sources in accordance with MEL.
View term扰流板失效
A system status where one or more spoiler panels are intentionally or automatically rendered inoperative for the flight.
View term技术放行单
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控制编号
A unique identifier assigned to a deferred defect, MEL/CDL item, or maintenance entry for tracking and compliance.
View term撤离滑梯失效
Inflatable escape slide at an aircraft door unserviceable, precluding passenger carriage until rectified or deferred per MEL.
View term操作程序
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放行偏差
An authorized variation from standard aircraft configuration or equipment status, documented for legal dispatch of a flight.
View term放行限制
Restrictive condition under which an aircraft may be dispatched due to system defect or MEL, affecting allowable operation.
View term救生衣缺失
Required passenger flotation device absent from its assigned seat location, rendering that position unserviceable until replaced in accordance with the MEL.
View term整改时限延长
Formal approval to extend the allowable period for repair of a deferred defect beyond original MEL interval.
View term日志条目
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最低设备
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最低设备清单
An approved document listing the minimum equipment required for safe operation of an aircraft, permitting specified inoperative items under controlled conditions.
View term服务通告待执行
Manufacturer’s recommended modification or inspection not yet incorporated; outstanding action listed in maintenance records.
View term机组座椅失效
Flight-deck seat fails to lock, adjust, or retract, potentially compromising crew safety and requiring MEL evaluation.
View term机组缺陷报告
Written logbook entry by flight crew describing observed technical defect or malfunction requiring maintenance action.
View term机队行动指令
Mandatory maintenance or modification order issued by the operator or manufacturer, applicable to an entire fleet.
View term构型偏差
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构型偏差清单项目
An entry in the Configuration Deviation List authorizing dispatch with specific external or configuration deviations, within specified limitations.
View term构型偏差清单项目
An authorized deviation from aircraft configuration detailed in the Configuration Deviation List, permitting dispatch with specific missing or inoperative external parts.
View term标牌
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消耗品已补充
A maintenance log entry confirming replenishment of expendable items such as oil, hydraulic fluid, or oxygen.
View term液压油量低
Indicates that the fluid level in a hydraulic reservoir is below the specified minimum for safe system operation.
View term状态监测
Ongoing process of assessing system or component health through data and trend analysis to guide maintenance decisions.
View term甚高频无线电1失效
Primary VHF radio channel 1 is not functional, requiring use of alternate radio or backup for ATC communications.
View term皮托管盖未拆除
Protective pitot-tube cover still fitted, blocking dynamic-pressure input and rendering airspeed indications unreliable.
View term禁止起飞项目
An inoperative or missing item which, according to MEL or regulatory requirements, prevents the aircraft from being legally dispatched.
View term空调组件失效
Indicates a failure of an air-conditioning pack, possibly affecting cabin pressurization and requiring MEL compliance before dispatch.
View term等待供应的部件
Maintenance action deferred because required replacement part is not yet available in inventory or supply chain.
View term纠正措施
The specific maintenance or operational step taken to resolve a defect, discrepancy, or deferred item as documented in the logbook or MEL.
View term维修控制中心
Centralized department overseeing aircraft technical status, defect clearance, and authorizing maintenance actions and MEL deferrals.
View term维修试飞
Post-maintenance air test conducted to verify aircraft performance and systems before return to commercial service.
View term维护程序
A required action by maintenance personnel to address an MEL/CDL item, often prerequisite for dispatch or rectification.
View term罗盘偏差
Error between magnetic compass indication and actual magnetic heading exceeding permissible limits; requires calibration swing.
View term计划组件更换
Pre-planned replacement of a part or system component at a specified interval or due time according to maintenance schedule.
View term计划组件更换
Pre-planned replacement of an aircraft component at specific intervals in accordance with the maintenance schedule.
View term调机飞行许可
Authority granted to reposition an aircraft without revenue passengers, often under MEL limitations, to maintenance or delivery point.
View term辅助动力装置放行
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辅助发电机失效
Aircraft auxiliary power unit (APU) generator not providing electrical power, requiring external source for ground operations and start.
View term运营人最低设备清单
The MEL approved by the state of the operator, tailored to specific airline operations, listing minimum equipment required for dispatch.
View term运行困难报告
Official report filed to aviation authority documenting significant aircraft/system in-service malfunction, defect, or repeated failure.
View term运行影响说明
Written record in technical log noting operational effects or limitations resulting from an aircraft defect, MEL, or deferred item.
View term连续航班
A sequence of successive flights where certain MEL/CDL items may remain deferred or require repeated checks as specified.
View term适航指令已记录
Mandatory compliance record entered in technical log documenting completion of authority-issued safety directive.
View term配置偏差清单
An official document specifying permissible aircraft configuration deviations that do not affect safe flight, used for dispatch with non-standard configurations.
View term重复项目
A recurring defect or observation required to be checked, recorded, or repeated at intervals specified in the MEL or logbook.
View term重量惩罚
An increase in operational weight or a reduction in allowable weight imposed due to specific inoperative equipment or configuration deviations.
View term防冰阀故障
Malfunction of wing or engine anti-ice valve preventing hot-air flow, compromising ice protection and requiring flight profile adjustment.
View term防滑系统失效
A condition where the antiskid braking system is not operational, requiring alternate braking procedures and possible performance penalties.
View term需进一步故障排查
Further diagnostic action needed to isolate cause of technical fault or failure not resolved by initial inspection.
View term需进行功能测试
Indicates requirement for an operational or systems test to confirm correct function of a repaired or replaced item.
View term需采用备用程序
Standard operating sequence unavailable; crew must follow officially published alternate or contingency checklist.
View term静电导流带缺失
Static electricity discharge wick absent from wing or control surface, potentially increasing radio interference until replaced.
View term非例行工作记录
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非关键设备和家具
Equipment or furnishings that are not essential for the airworthiness or safety of the flight and may be deferred.
View term非周期检查
Maintenance inspection not aligned with normal cycle, scheduled according to special interval or condition.
View term非必要设备和家具
Equipment and furnishings that are not required for safe operation or regulatory compliance and may be inoperative without affecting dispatch eligibility.
View term飞行中发动机启动
The procedure of starting an engine during flight, often due to engine flameout or following maintenance.
View term