Flight Data Monitoring: Guide for Aviation Operators

Key takeaways

• Flight Data Monitoring (FDM) — also referred to as Flight Data Analysis (FDA), and commonly associated with Flight Operations Quality Assurance (FOQA) in the United States — is the systematic analysis of routine flight data to identify operational events, recurring patterns, and emerging safety risks. Under EASA Air OPS, an FDM programme is required for certain commercial air transport operations with aeroplanes above 27,000 kg MCTOM, while FDM principles can also deliver significant value to smaller aircraft and general aviation fleets.
• FDM becomes more valuable when it connects with continuing-airworthiness and maintenance workflows. Events such as hard landings, excessive G-loads, engine exceedances, or recurring operational patterns can then be evaluated alongside aircraft history and maintenance information — helping technical teams determine whether further inspection or maintenance action may be required rather than leaving flight-data insights isolated in a separate safety system.
• Understanding Part 21, CAMO/CAO, and Part 145 responsibilities is important when flight data reveals a potential technical issue. Part 21 addresses aircraft and component design and production responsibilities; CAMO/CAO manages continuing-airworthiness activities within the scope of its approval; and Part 145 organizations perform and certify approved maintenance. An FDM finding can therefore support different actions depending on whether it points to an operational event, a maintenance issue, a continuing-airworthiness concern, or a potential design-related issue.

 

What is Flight Data Monitoring?

Flight Data Monitoring (FDM) – also referred to as Flight Data Analysis (FDA/FDAP), or Flight Operations Quality Assurance (FOQA) in the United States, and often as Helicopter Flight Data Monitoring (HFDM) when applied to helicopters – is the systematic collection and analysis of routine flight data to identify operational events, recurring patterns, and emerging safety risks.

Flight data can come from different sources depending on the aircraft and operation. On larger commercial aircraft, data is typically obtained from onboard recording systems such as Flight Data Recorders (FDRs) and Quick Access Recorders (QARs). In general aviation and light aircraft, FDM can increasingly rely on lightweight connected telemetry devices combining GPS, AHRS/IMU, and other sensors.

Depending on the aircraft and recording system, monitored parameters can include:

• Airspeed or groundspeed, altitude, and vertical speed
• Aircraft attitude: pitch, roll, and yaw
• G-loads and acceleration
• Control inputs or aircraft configuration
• Engine parameters such as RPM, EGT, or vibration
• GPS position, trajectory, and flight path

Once collected — through cellular or satellite transmission, Wi-Fi upload, removable media, or manual download — flight data is processed by analysis software to identify predefined events, exceedances, and trends.

These might include a hard landing, unstable approach, excessive G-load, high-speed taxi, abnormal bank angle, or other deviation from predefined operational criteria. Flagged events can then be reviewed by the operator’s safety team to understand what happened, identify recurring patterns, and determine whether further operational, training, or technical investigation is appropriate.

Unlike accident investigation, which primarily examines events after something has gone wrong, FDM analyses routine operations — including flights where no incident occurred. This makes it a proactive safety-management tool, helping operators identify trends and emerging risks before they contribute to a more serious event.

Is Flight Data Monitoring mandatory?

Under EASA ORO.AOC.130, operators must establish and maintain an FDM system, integrated into their management system, for aeroplanes with a maximum certificated take-off mass above 27,000 kg. The programme must be non-punitive and include safeguards to protect the sources of the data.

ICAO Annex 6 similarly requires a Flight Data Analysis Programme (FDAP) for applicable commercial air transport aeroplanes above 27,000 kg and recommends one for aeroplanes above 20,000 kg.

Below those thresholds — including much of general aviation, flight training, and light-aircraft operations — FDM can be adopted voluntarily. Lightweight connected telemetry devices are making this increasingly practical without requiring the recording infrastructure traditionally associated with large commercial aircraft.

The underlying principle is the same regardless of aircraft size: use data from routine flights to understand what is happening across the operation, identify recurring risks, and act before those risks contribute to an incident.

 

Why Flight Data Monitoring matters for aviation operators

FDM sits at the intersection of safety, operations, training, and continuing airworthiness, which is why its value extends well beyond the safety manager:

• Safety managers use FDM to strengthen the Safety Management System (SMS) with objective operational data, complementing voluntary reports and other safety information.
• CAMO/CAO and maintenance teams can use relevant FDM events and trends to support technical assessment and maintenance decisions. A recurring vibration trend, abnormal engine behaviour, or a significant event such as a hard landing can trigger further investigation or an earlier inspection, rather than waiting for the issue to emerge during routine scheduled maintenance.
• Flight operations and training teams can use aggregated FDM and telemetry data to identify recurring operational patterns, refine SOPs, target training, and support more consistent instructor debriefing with objective evidence.
• Accountable managers and management teams gain additional objective data to support safety-performance monitoring, risk management, and regulatory oversight within the operator’s management system.

The operators that gain the most value from FDM don’t treat it as an isolated compliance exercise. They connect flight data with the systems already managing operations, training, safety, and continuing airworthiness, turning detected events into actionable workflows.

This is the gap Intuos’ Inflight Monitor Unit (IFU) is designed to close for general aviation, flight schools, and other light-aircraft operators. The IFU is a lightweight connected telemetry device that captures flight data and can transmit it in near real time directly into The Manager© platform.
Compatible installations can use the applicable EASA CS-STAN framework without requiring an individual STC, providing operators with automated flight-data capture without the complexity of traditional flight-data recording infrastructure.

The result is a connected workflow from aircraft → flight data → analytics → safety, training, and maintenance action.

 

How Flight Data Monitoring connects to continuing airworthiness management software

A continuing airworthiness management software platform is where an operator or CAMO/CAO can manage maintenance programme compliance, Airworthiness Directives (ADs), applicable Service Bulletins (SBs), component life limits, technical records, and airworthiness-review workflows. FDM and continuing-airworthiness systems are often run separately — but connecting them can turn flight data into actionable technical information.

Why integration matters in practice:

1. Trend-to-task linkage.
   An FDM event — for example, a hard landing or repeated abnormal loads on a specific aircraft — can be linked directly to that aircraft’s technical record and workflow. Instead of remaining isolated in a safety report, the event becomes visible to the technical team and can trigger an assessment and, where appropriate, an inspection or maintenance action.
2. Better evidence for technical and airworthiness assessment.
   Maintenance records show what work has been performed and what is due. FDM adds another layer: how the aircraft has actually been operated. Loads, cycles, exceedances, and usage patterns can provide valuable context when investigating technical issues and assessing aircraft condition.
3. Reduced duplicate data entry.
   Without integration, relevant aircraft events may need to be manually transferred between FDM, safety, and maintenance systems. Connecting the workflows reduces duplicate entry, limits the risk of information being missed, and creates a clearer link between the event, its technical assessment, and any resulting action.
4. Condition-informed maintenance alongside scheduled maintenance.
   Correlating actual aircraft usage, loads, and engine behaviour with maintenance information can help CAMO/CAO and maintenance teams identify abnormal trends earlier and determine whether further investigation is appropriate. This complements rather than replaces the approved maintenance programme and mandatory scheduled tasks, adding real-world aircraft condition and usage data to maintenance planning.
5. Greater traceability and audit readiness.
   A connected FDM and continuing-airworthiness workflow creates a traceable history of what happened, what was reviewed, and what action was taken. This provides stronger supporting evidence for internal safety and continuing-airworthiness processes and can make information easier to retrieve during audits and regulatory oversight.

From flight data to maintenance action

Intuos addresses this directly through The Manager©, which combines continuing-airworthiness and maintenance workflows with data generated by connected aircraft monitoring devices.

The Inflight Unit (IFU) provides flight and aircraft-dynamics data, while the Audio Engine Monitor (AEM) adds acoustic and vibration-based information about engine behaviour. Bringing these data sources into the same ecosystem as technical records and maintenance workflows enables CAMO/CAO and maintenance teams to move beyond managing compliance deadlines alone toward more proactive, data-informed technical oversight.

See Intuos for CAMO & Maintenance

The objective isn’t to replace scheduled maintenance with algorithms. It is to create a connected workflow:

Flight → Event → Analysis → Technical Assessment → Maintenance Action

For CAMO/CAO organisations, this also creates an opportunity to evolve from primarily providing compliance administration toward higher-value technical oversight — using operational and condition data to help customers understand not only what maintenance is due, but where additional technical attention may be needed.

When evaluating continuing airworthiness management software, therefore, ask whether it can ingest or reference FDM and condition-monitoring outputs — not just whether it manages ADs, maintenance schedules, and component tracking in isolation.For a closer look at what that connected telemetry stream actually looks like in practice, see 5 Things Your Flight Data Is Telling You That You’re Not Hearing.

FDM provides one part of the picture: how the aircraft is being operated. Engine monitoring adds another: how the powerplant is behaving. Connecting both with continuing-airworthiness workflows is what turns aircraft data into actionable technical intelligence. See our companion guide on what causes engine failure in light aircraft and how acoustic engine monitoring closes that gap, and how IoT sensors are transforming fleet monitoring more broadly.

 

Part 21 vs Part 145: what the difference means for FDM

Part 21 and Part 145 cover different parts of the aircraft lifecycle, and an FDM finding can ultimately lead to actions involving either. In practice, however, the operator and CAMO/CAO provide the important link between flight-data findings and the appropriate technical response.

	Part 21	Part 145
Covers	Aircraft and component design, production, changes, and repairs	Approved aircraft and component maintenance
Who holds the approval	Design Organisations, Production Organisations, Type Certificate holders and other approved design/production organisations, depending on the activity	Approved Maintenance Organisations (AMOs)
Relevance to FDM	A recurring or fleet-level finding that may indicate a design-related or systemic technical issue can provide information for engineering assessment by the relevant design organisation or approval holder	An aircraft-specific event or technical finding may result in inspection, troubleshooting, repair, or component replacement performed and certified by an approved maintenance organisation
Example FDM trigger	Similar abnormal behaviour repeatedly identified across multiple aircraft, potentially indicating a broader technical or design-related issue	A hard landing, exceedance, abnormal vibration, or other aircraft-specific event requiring technical assessment and potentially maintenance action

Where CAMO/CAO fits

The distinction is important, but FDM data does not automatically determine whether an issue belongs to Part 21 or Part 145.

A more realistic workflow is:

FDM Event → Operator / CAMO-CAO Assessment → Technical Decision → Part 145 Maintenance and/or Part 21 Engineering Escalation

For example, a hard-landing event identified through FDM may first be reviewed to determine whether an inspection is required. If maintenance is necessary, the appropriate approved maintenance organisation performs and certifies the work.

If, however, repeated data across aircraft suggests a broader technical problem that cannot be addressed solely through existing maintenance data or instructions, the issue may need to be escalated to the relevant design organisation, Type Certificate holder, or other design approval holder for engineering assessment.

 

Why this distinction matters for CAMO/CAO teams

For continuing-airworthiness teams, the value of FDM is not simply detecting an event. It is providing objective operational data that can be connected to the appropriate technical workflow.

That means being able to distinguish between:

an operational event requiring review → an aircraft-specific maintenance issue → a potentially broader design or engineering issue.

Connecting FDM with continuing-airworthiness management therefore helps ensure that relevant information reaches the right organisation, with the appropriate technical context and traceability, rather than remaining isolated in a safety report or flight-data system.

How to evaluate or implement an FDM program

1. Confirm your regulatory requirements.
   Start by determining which requirements apply to your aircraft, operation, and jurisdiction. In Europe, this includes EASA ORO.AOC.130 for applicable commercial air transport operations; internationally, ICAO Annex 6 provides the relevant framework for Flight Data Analysis Programmes. In the United States, operators should consider the applicable FAA requirements and guidance, together with relevant industry programmes and best practices.
2. Choose the right data-capture method: FDR, QAR, or lightweight telemetry.
   Traditional airline FDM programmes typically obtain data from aircraft recording systems such as FDRs and QARs. General aviation, flight schools, aeroclubs, and light helicopters can increasingly use lightweight telemetry devices combining GPS, AHRS/IMU, onboard storage, and connectivity. For example, compatible installations of Intuos’ IFU can use the applicable EASA CS-STAN framework without requiring an individual STC.
3. Select an FDM analysis tool that turns raw data into usable information.
   Look beyond data recording. An effective system should support automated event and exceedance detection, flight reconstruction, trend analysis, and fleet-level reporting. Manual flight-by-flight review quickly becomes difficult to scale as aircraft utilisation and fleet size increase.
4. Define and validate your event and exceedance criteria.
   Thresholds should reflect the aircraft type, operating procedures, fleet characteristics, and safety objectives. Vendor defaults can provide a starting point, but they should be reviewed and adapted with appropriate operational and technical expertise rather than applied blindly.
5. Establish appropriate data-governance and non-punitive principles.
   An effective FDM programme requires clear rules covering data access, confidentiality, crew protection, event review, and escalation. Where required by the applicable regulatory framework, FDM must operate on a non-punitive basis with appropriate safeguards for data sources. More broadly, aligning the programme with Just Culture principles helps support crew trust and constructive use of the data.
6. Connect findings to safety, operations, training, and continuing-airworthiness workflows.
   Detecting an exceedance is only the beginning. Define what happens next: who reviews the event, when it should be escalated, and whether it requires a safety, training, operational, or technical response. Relevant FDM findings can then support CAMO/CAO and maintenance teams with additional operational context without replacing the approved maintenance programme or established technical decision-making processes.
7. Evaluate integration before selecting systems in isolation.
   When assessing an FDM solution or continuing-airworthiness management platform, ask how easily information can move between them. Can a flight event be associated with the correct aircraft? Can it be referenced in a technical workflow? Can safety, operations, training, and maintenance teams work from the same underlying information?
   An integrated approach — such as The Manager© combined with the Intuos IFU — connects aircraft data directly with operational and technical workflows, reducing the gap between detecting an event and taking the appropriate action.

The technology is only one part of an effective FDM programme. The real value comes from building a closed loop:

Capture → Detect → Analyse → Review → Act → Learn

An FDM programme succeeds when flight data doesn’t simply generate more reports, but becomes part of how the organisation continuously improves safety, training, operations, and technical oversight.

 

FAQ about Flight Data Monitoring

Is Flight Data Monitoring mandatory?

Under EASA ORO.AOC.130, operators conducting commercial air transport operations with aeroplanes having a maximum certificated take-off mass (MCTOM) above 27,000 kg must establish and maintain a Flight Data Monitoring (FDM) programme as part of their management system.

Requirements vary by jurisdiction, aircraft category, and type of operation, so operators should always check the regulations applicable to their specific operation.

Below the mandatory threshold, FDM can be adopted voluntarily by general aviation operators, flight schools, aeroclubs, and other light-aircraft fleets to support safety monitoring, training, and operational improvement.

 

What’s the difference between FDM, FOQA, FDA, and HFDM?

The terms describe closely related approaches to the systematic collection and analysis of routine flight data, but their usage varies by regulatory context and aircraft type.

• FDM (Flight Data Monitoring) is the term commonly used in the EASA and European aviation context.
• FDA (Flight Data Analysis) refers more broadly to the analysis of recorded flight data; ICAO formally uses FDAP (Flight Data Analysis Programme).
• FOQA (Flight Operations Quality Assurance) is the term commonly used in the United States for programmes that analyse routine flight data to improve operational safety.
• HFDM (Helicopter Flight Data Monitoring) applies the same principles specifically to helicopter operations.

In practice, they share the same core objective: using data from routine flights to identify events, trends, and emerging risks before they contribute to a serious incident or accident.

 

Does FDM data get used punitively against pilots?

Under EASA ORO.AOC.130, an FDM programme must be non-punitive and contain adequate safeguards to protect the source(s) of the data. This is fundamental to maintaining crew trust and ensuring that flight data is used primarily to improve safety rather than assign blame.

More broadly, effective FDM programmes are typically aligned with Just Culture principles, with clear policies governing data confidentiality, access, event review, and escalation.

The objective is to use routine flight data to identify risks, understand trends, and improve operations and training — not to turn FDM into a disciplinary surveillance tool.

 

Can FDM findings affect maintenance scheduling?

Yes. FDM events and trend data — such as repeated hard landings, abnormal loads, or changes in engine vibration — can trigger technical assessment and, where appropriate, an additional or earlier inspection or maintenance action.

When FDM data is connected with continuing-airworthiness management software, CAMO/CAO and maintenance teams can link operational events directly to the aircraft’s technical history and use that information to support condition-informed maintenance planning.

FDM does not replace or automatically change the approved maintenance programme or mandatory maintenance intervals; it adds operational and condition data that can help technical teams decide when additional attention may be required.

 

Do I need a certified flight data recorder to do FDM?

Not necessarily. FDM does not inherently require a certified Flight Data Recorder (FDR). The appropriate data source depends on the aircraft, operation, applicable recording requirements, and the objectives of the FDM programme.

Large commercial aircraft typically use data from onboard recording systems such as FDRs and Quick Access Recorders (QARs). In general aviation, flight schools, aeroclubs, and other light-aircraft operations, FDM can also be implemented using lightweight telemetry devices that capture the flight parameters needed for monitoring and analysis.

For example, compatible installations of the Intuos Inflight Unit (IFU) can use the applicable EASA CS-STAN framework without requiring an individual Supplemental Type Certificate (STC), enabling FDM capabilities without the complexity of traditional flight-data recording infrastructure.