Civil Law and Aircraft Component Failure Claims in Europe

Aircraft component failure claims in Europe involve a combination of contract law, product liability, aviation-safety regulation, tort/delict law, EU passenger-rights law, and international air-carriage law.

Examples include failure of:

• aircraft engines;
• fuel pumps;
• fuel gauges;
• hydraulic systems;
• landing gear;
• flight-control systems;
• avionics;
• navigation equipment;
• software-controlled components;
• turbine blades;
• compressor blades;
• electrical systems;
• safety-critical sensors.

A crucial distinction must be made between a claim against the airline and a claim against the component manufacturer, maintenance organization, supplier, or other responsible party.

A useful framework is:

Component defect/failure → aircraft malfunction → damage → causation → responsible actor → applicable legal regime → compensation

There is relatively little European appellate case law directly awarding damages against an aircraft-component manufacturer. However, CJEU jurisprudence concerning aircraft component failures provides important principles on defect classification, airline responsibility, manufacturer fault, and recourse against manufacturers.

1. Meaning of an Aircraft Component Failure Claim

An aircraft component failure claim arises when a component:

1. contains a manufacturing defect;
2. contains a design defect;
3. deteriorates prematurely;
4. fails because of inadequate maintenance;
5. contains defective software;
6. is incorrectly installed;
7. lacks adequate warnings or instructions;
8. causes an aircraft incident or accident;
9. causes cancellation or delay;
10. causes property, personal, or economic loss.

Potential claimants include:

• passengers;
• airlines;
• aircraft owners;
• lessors;
• maintenance organizations;
• cargo owners;
• insurers;
• employees or crew;
• airports;
• other businesses.

Potential defendants include:

• component manufacturer;
• aircraft manufacturer;
• engine manufacturer;
• airline;
• maintenance organization;
• repair station;
• supplier;
• distributor;
• lessor.

2. Different Legal Relationships

A single component failure can generate several different legal claims.

A. Passenger v Airline

Example:

Engine component fails → flight cancelled → passenger seeks statutory compensation.

The principal EU legislation is Regulation 261/2004.

B. Airline v Manufacturer

Example:

Defective engine component causes repeated aircraft grounding → airline seeks repair costs and other contractual or tort damages from manufacturer.

C. Aircraft owner v Manufacturer

Example:

Defective component causes physical damage to the aircraft.

D. Injured person v Manufacturer

Example:

Component failure causes crash → passenger or family seeks product-liability compensation.

E. Airline v Maintenance Provider

Example:

Incorrect maintenance causes component failure.

The applicable legal rules can be completely different in each relationship.

3. Product Liability Framework

Historically, European defective-product claims have been governed by Directive 85/374/EEC as implemented by national law.

The EU has now adopted Directive (EU) 2024/2853 on liability for defective products, repealing Directive 85/374/EEC. The new Directive expressly addresses defective components and provides that the manufacturer of a defective component can be liable where the component causes the product to become defective.

The new framework is therefore highly relevant to future aircraft-component litigation.

4. What Constitutes a Defective Component?

A component can potentially be defective because of:

Design defect

The component was unsafe according to its intended design.

Manufacturing defect

The design was safe, but one batch or unit was manufactured incorrectly.

Information defect

The manufacturer failed to provide adequate warnings or instructions.

Software defect

The component's software or firmware causes unsafe operation.

Update defect

A safety-critical update is defective or inadequately designed.

The 2024 Product Liability Directive continues the basic principle that the injured person must establish the defect, damage and causal relationship, while introducing important presumptions concerning proof, including situations involving technical or scientific complexity.

5. Case Law

Case 1 — D. S.A. v P. S.A., C-411/23

CJEU, 13 June 2024

This is one of the most directly relevant recent European cases concerning an aircraft-engine design defect.

Facts

A passenger had booked a flight from Poland to the United States.

The engine manufacturer had previously informed the airline about a hidden design defect affecting high-pressure compressor blades.

An engine malfunction subsequently occurred.

The aircraft had to be removed from service, resulting in a lengthy flight delay.

Legal issue

Could the airline avoid passenger compensation under Article 5(3) of Regulation 261/2004 by treating the hidden engine-design defect as an extraordinary circumstance?

CJEU decision

The Court held that detection of a hidden engine-design defect affecting flight safety can constitute an extraordinary circumstance, even where the manufacturer had informed the carrier of the defect several months before the relevant flight.

However, the airline must still take reasonable measures to prevent or mitigate the consequences. The Court stated that maintaining a backup fleet could constitute such a measure where technically and economically feasible.

Importance

The case demonstrates a distinction between:

ordinary component failure

and

hidden safety-critical design defect revealed after entry into service.

Principle

A hidden engine design defect may be external to the airline's normal operations and outside its actual control, but the airline's duty to take reasonable preventive measures remains relevant.

6. Case 2 — Finnair Oyj v A, C-385/23

CJEU, 13 June 2024

This case concerned a hidden design defect in an aircraft fuel-measuring system.

Facts

A failure occurred in the aircraft's fuel-measurement system.

The manufacturer subsequently determined that the problem resulted from a hidden design defect affecting aircraft of the same type.

Decision

The CJEU concluded that a technical failure caused by a hidden design defect affecting aircraft of the same type and discovered by the manufacturer after cancellation could qualify as an extraordinary circumstance under Regulation 261/2004.

Importance

This case is especially relevant to:

• avionics;
• sensors;
• fuel systems;
• software-controlled equipment;
• common design defects.

Principle

A defect affecting an entire aircraft type can be legally different from an ordinary failure arising during normal airline operations.

7. Case 3 — van der Lans v KLM, C-257/14

CJEU, 17 September 2015

This is one of the most important component-failure cases.

Facts

An aircraft suffered an unexpected technical problem.

The problem was not attributable to poor maintenance and had not been detected during routine maintenance.

Decision

The CJEU held that the unexpected failure of a component does not automatically constitute an extraordinary circumstance under Regulation 261/2004.

The Court emphasized that the carrier has responsibility for maintaining and operating its aircraft.

Importantly, the Court stated that even if the manufacturer might ultimately be responsible, that does not automatically eliminate the airline's obligation to compensate passengers under Regulation 261/2004.

The airline may potentially seek reimbursement from the responsible third party under Article 13 of Regulation 261/2004.

Principle

A component manufacturer's possible fault does not automatically release the airline from its passenger-compensation obligations.

This creates two separate relationships:

Passenger → Airline

and

Airline → Manufacturer

8. Case 4 — Wallentin-Hermann v Alitalia, C-549/07

CJEU, 22 December 2008

This is the foundational EU case on technical aircraft defects.

Facts

The flight was cancelled because of a technical problem involving an aircraft engine.

The airline argued that the technical problem constituted an extraordinary circumstance.

Decision

The CJEU established that technical problems are not ordinarily extraordinary circumstances.

However, a hidden manufacturing defect affecting flight safety, revealed by the manufacturer or competent authority after the aircraft has entered service, may qualify as extraordinary.

Importance

The judgment created the basic distinction:

Principle

The origin and nature of the defect are more important than merely describing it as a “technical failure.”

9. Case 5 — Finnair v Customer, C-832/18

CJEU, 12 March 2020

This case concerned failure of an “on-condition” aircraft component.

An on-condition component is generally replaced when it becomes defective rather than automatically after a predetermined interval.

Decision

The CJEU held that premature or unexpected failure of such a component is generally inherent in the normal operation of an airline and therefore does not automatically constitute an extraordinary circumstance.

The Court emphasized that the airline's responsibility for maintenance and proper functioning of its aircraft remains relevant.

Importance

The case is useful when determining whether:

• a component should have been replaced;
• the airline should have maintained a spare;
• the failure was part of normal aircraft operation;
• the airline had control over the risk.

Principle

The unexpected failure of an aircraft component is not automatically an extraordinary event simply because it was unexpected.

10. Case 6 — Germanwings GmbH v Ronny Henning, C-501/17

CJEU, 4 April 2019

This case concerned a technical problem affecting an aircraft.

The CJEU reiterated that aircraft operators regularly encounter technical problems because aircraft contain highly sophisticated systems and components.

Therefore, premature or unexpected failure of aircraft parts is generally regarded as inherent in the normal operation of air transport.

Importance

This case reinforces the principle that:

unexpected ≠ extraordinary.

For an aircraft-component claim, the claimant should therefore investigate the precise nature and origin of the failure.

11. Case 7 — SATA International – Azores Airlines, C-308/21

CJEU, 7 July 2022

This case helps clarify the boundary between internal technical failures and events originating externally.

The CJEU examined whether problems involving airport/refuelling infrastructure could constitute extraordinary circumstances.

Importance

The judgment illustrates that the source of the technical problem matters.

A distinction can be made between:

internal aircraft/airline problem

and

external event outside the carrier's control.

This is important where an aircraft component fails because of:

• contaminated fuel;
• airport equipment;
• third-party servicing;
• external infrastructure;
• another operator's interference.

The CJEU's subsequent engine-defect jurisprudence expressly refers to this internal/external distinction.

12. Case 8 — Commission v United Kingdom, C-300/95

CJEU, 29 May 1997

This case concerns the original EU Product Liability Directive rather than aviation specifically, but it is important for an aircraft-component manufacturer.

Issue

The case examined the development-risk defence under Article 7(e) of Directive 85/374.

Principle

EU product liability operates essentially as a strict-liability regime: the injured person does not have to establish producer fault in the ordinary sense.

However, the producer may invoke certain statutory defences, including the situation where the state of scientific and technical knowledge at the time of circulation did not enable the defect to be discovered.

Aviation relevance

Suppose an aircraft component contained a microscopic defect that could not reasonably have been discovered using the scientific and technical knowledge available when it entered circulation.

The manufacturer may attempt to rely on the applicable development-risk defence under the relevant national implementation.

13. Manufacturer Liability Versus Airline Liability

This is a fundamental issue.

Airline

The airline is responsible for:

• safe operation;
• maintenance;
• inspections;
• replacement of components;
• compliance with airworthiness requirements;
• passenger obligations.

Manufacturer

The manufacturer may be responsible for:

• defective design;
• manufacturing defect;
• inadequate warnings;
• unsafe instructions;
• defective software;
• defective component.

Maintenance organization

The maintenance organization may be responsible for:

• incorrect installation;
• inadequate inspection;
• incorrect repair;
• failure to follow maintenance instructions.

Thus:

Same accident ≠ same legal defendant.

14. Airline's Right of Recourse Against Manufacturer

van der Lans is particularly important here.

The CJEU expressly recognized that the airline's obligation to compensate passengers under Regulation 261/2004 does not prevent the airline from pursuing the person responsible for the delay, potentially including a manufacturer.

This can create a two-stage litigation structure:

Stage 1

Passenger → Airline

Passenger compensation under EU law.

Stage 2

Airline → Manufacturer

Contractual, tortious, product-liability or other recovery claim.

15. Product Liability for the Component Itself

A critical complication arises when the defective component damages the aircraft in which it is installed.

The traditional Product Liability Directive distinguished between:

• damage caused by the defective product;
• damage to the defective product itself;
• damage to other property.

The new Product Liability Directive specifically addresses defective components.

Article 8 provides for liability of the manufacturer of a defective component where that component causes the product to become defective.

16. The 2024 Product Liability Directive

Directive (EU) 2024/2853 is particularly important for future aviation disputes.

It modernizes EU product liability to address:

• complex products;
• software;
• digital systems;
• AI;
• interconnected products;
• updated products;
• modern evidence problems.

The Directive establishes compensation rights for specified categories of damage, including death and personal injury and damage to property.

It also expressly deals with defective components.

Evidence

The Directive recognizes the special difficulty of proving defects in technically complex products.

Under its evidentiary rules, presumptions can arise where:

• relevant evidence is not disclosed;
• mandatory safety requirements were violated;
• there is an obvious malfunction;
• technical/scientific complexity creates excessive difficulties in proving defect or causation. 

This could be highly significant in future aircraft-component litigation.

17. Design Defect Versus Manufacturing Defect

Design defect

The entire product or component was designed in an unsafe way.

Example:

All engines of a particular type contain an unsafe compressor-blade design.

This resembles the facts discussed in D. S.A. v P. S.A..

Manufacturing defect

The design is safe but one particular component was manufactured incorrectly.

Example:

A turbine blade contains a microscopic manufacturing crack.

Maintenance defect

The component was safe, but maintenance caused the failure.

Example:

Improper installation of a fuel-control component.

The responsible defendant can therefore change depending upon the source of the failure.

18. Causation

Causation is often the hardest issue.

A typical accident may involve:

Component defect → component failure → engine malfunction → loss of aircraft control → accident → injury

But there may also be:

• pilot error;
• maintenance failure;
• weather;
• air-traffic-control factors;
• other component failures.

The claimant therefore needs to establish the causal chain.

19. Expert Evidence

Aircraft-component litigation commonly requires experts in:

Engineering

To determine:

• component design;
• failure mechanism;
• fatigue;
• fracture;
• manufacturing tolerance.

Aviation safety

To determine:

• airworthiness;
• maintenance requirements;
• safety standards.

Materials science

For:

• metal fatigue;
• corrosion;
• thermal damage;
• fracture analysis.

Software engineering

For:

• avionics software;
• firmware;
• flight-control algorithms.

Economics

For:

• aircraft grounding losses;
• repair costs;
• lost revenue;
• replacement costs.

20. Failure Investigation Evidence

Important evidence includes:

• flight-data recorder information;
• cockpit voice recorder information where legally usable;
• maintenance records;
• component serial numbers;
• manufacturing records;
• inspection reports;
• service bulletins;
• airworthiness directives;
• recall notices;
• engineering reports;
• metallurgical analysis;
• supplier records;
• warranty documents;
• aircraft logbooks.

The litigation may require preservation of the failed component itself.

21. Airworthiness Directives and Safety Bulletins

An airworthiness directive or manufacturer's safety bulletin can become important evidence.

For example:

Manufacturer discovers defect → issues service bulletin → aviation authority issues directive → airline modifies aircraft.

This can help establish:

• existence of a defect;
• knowledge;
• foreseeability;
• appropriate corrective action;
• timing of knowledge.

But the mere existence of a safety bulletin does not automatically establish civil liability.

22. Hidden Defect

The European case law makes an important distinction.

Hidden manufacturing/design defect

Potentially:

external to airline's normal control.

Ordinary component failure

Generally:

part of normal aircraft operation and maintenance risk.

This distinction appears consistently in:

• Wallentin-Hermann;
• van der Lans;
• Germanwings;
• Finnair;
• D. S.A. v P. S.A.

23. Economic Loss

An airline may suffer:

• aircraft grounding;
• replacement aircraft costs;
• cancelled flights;
• maintenance costs;
• spare-component costs;
• passenger compensation;
• hotel and rebooking expenses;
• lost revenue;
• regulatory compliance costs.

Whether all such losses can be recovered from the manufacturer depends upon:

• contract;
• warranty;
• applicable national law;
• product-liability rules;
• limitation clauses;
• causation;
• remoteness;
• insurance;
• indemnity provisions.

24. Pure Economic Loss

A particularly difficult issue is pure economic loss.

Suppose:

A defective engine requires premature replacement but causes no personal injury or damage to other property.

The claim for the replacement cost of the defective component itself may be treated differently from a claim involving personal injury or damage to other property.

The contractual warranty or supply agreement may therefore be more important than product liability.

25. Contractual Claims

Aircraft manufacturers and airlines frequently operate under sophisticated contracts.

Potential contractual provisions include:

• warranty;
• repair/replace obligations;
• spare-parts agreements;
• maintenance support;
• service-level agreements;
• indemnities;
• exclusions;
• liability caps;
• consequential-loss exclusions;
• insurance requirements;
• governing law;
• arbitration clauses.

Thus, a commercial airline's claim against an engine manufacturer may be predominantly contractual rather than tortious.

26. Product Liability and Contract Can Coexist

The same component failure can potentially generate:

Contract claim

Airline → Manufacturer

because the component breached contractual specifications.

Product-liability claim

Injured person → Manufacturer

because the component was defective and caused legally recognized damage.

Negligence claim

Claimant → Manufacturer

where national law recognizes an independent negligence duty.

These causes of action must be analyzed separately.

27. Passenger Compensation and Component Liability

Regulation 261/2004 creates an important practical structure.

Suppose:

Engine component fails → flight cancelled.

The airline may owe passenger compensation unless the circumstances fall within Article 5(3).

But the airline can potentially pursue the responsible third party under Article 13.

van der Lans expressly recognizes this possibility.

Therefore:

Passenger protection and manufacturer responsibility operate on different legal planes.

28. Hidden Design Defect Known Before Failure

The D. S.A. judgment adds an important nuance.

Suppose:

Manufacturer informs airline of defect → airline continues operation → component fails → flight delayed.

The existence of prior manufacturer notice does not necessarily mean the defect ceases to be an extraordinary circumstance under Regulation 261/2004.

The CJEU held that the hidden design defect could still qualify as extraordinary, while the airline's reasonable preventive measures remained relevant.

This is highly fact-sensitive.

29. Multi-Party Liability

An aircraft accident may involve:

Component manufacturer

↓

Aircraft manufacturer

↓

Airline

↓

Maintenance company

↓

Pilot/crew

↓

Passenger

The court must determine:

• whose conduct caused the damage;
• whether multiple actors contributed;
• whether one actor has contractual indemnity;
• whether contribution claims exist;
• whether insurance responds;
• which liability regime governs each relationship.

30. Defences Available to Manufacturers

Depending on applicable law, a manufacturer may argue:

1. No defect

The component met applicable safety requirements.

2. No causation

Another event caused the accident.

3. Misuse

The component was used outside its intended conditions.

4. Maintenance failure

The component failed because it was improperly maintained.

5. Modification

A third party altered the component.

6. Development risk

The defect could not reasonably have been discovered using the scientific and technical knowledge available when the product entered circulation, where the relevant statutory regime provides this defence.

The CJEU's Commission v United Kingdom, C-300/95 judgment is important for the development-risk defence under the former Product Liability Directive.

31. Burden of Proof

Under traditional product-liability principles, the claimant generally has to establish:

Defect + Damage + Causation

The new 2024 Product Liability Directive expressly maintains these core elements while introducing presumptions intended to address difficulties arising from technically and scientifically complex products.

This is particularly significant for aircraft because:

• components are technically complex;
• manufacturers possess much of the relevant information;
• proprietary engineering data may be unavailable to victims;
• failure mechanisms can require specialist analysis.

32. Insurance

Aircraft-component disputes commonly involve:

• aviation hull insurance;
• liability insurance;
• product liability insurance;
• manufacturer insurance;
• reinsurance.

After paying a claim, an insurer may have rights of subrogation under applicable law.

This can result in:

Insurer → Manufacturer

or:

Insurer → Maintenance organization

claims.

33. Limitation and Jurisdiction

The applicable limitation period depends upon the legal basis of the claim.

A claimant must distinguish between:

• contractual limitation;
• product-liability limitation;
• tort limitation;
• Montreal Convention limitation;
• passenger-rights claims.

Jurisdiction may also depend on:

• defendant's domicile;
• place of damage;
• place of contract;
• applicable EU jurisdiction rules;
• arbitration agreement.

34. Six Most Important Cases to Memorize

For examination purposes, these six are especially useful:

These cases are all CJEU authorities concerning the legal consequences of aircraft technical/component failures.

For manufacturer product-liability analysis, add:

Commission v United Kingdom, C-300/95 → development-risk defence under the former EU Product Liability Directive.

35. Quick Case Revision

1. Wallentin-Hermann

Hidden manufacturing defect → potentially extraordinary.

2. van der Lans

Unexpected component failure → normally airline responsibility under passenger-compensation law.

3. Germanwings

Premature part failure → generally inherent in airline activity.

4. Finnair C-832/18

On-condition component failure → normally not extraordinary.

5. Finnair C-385/23

Hidden fuel-system design defect → potentially extraordinary.

6. D. C-411/23

Hidden engine design defect → extraordinary, but reasonable preventive measures still required.

7. Commission v UK

Product liability → development-risk defence.

36. Exam-Ready Legal Test

When an aircraft-component failure claim arises, use this sequence:

1. Identify the failed component
↓
2. Identify the suspected defect
↓
3. Determine whether it is design, manufacturing, maintenance, installation or software-related
↓
4. Identify the defendant
↓
5. Identify the contractual relationship
↓
6. Determine whether product-liability legislation applies
↓
7. Establish defect
↓
8. Establish damage
↓
9. Establish causation
↓
10. Examine airline's statutory passenger obligations
↓
11. Examine manufacturer's contractual/warranty liability
↓
12. Apply available defences and liability limits
↓
13. Determine damages and contribution/subrogation
↓
14. Check limitation and jurisdiction

Conclusion

Aircraft component failure litigation in Europe requires separating three different questions:

First:

Was the component defective?

Second:

Who legally bears responsibility for that defect?

Third:

What type of claim is being brought?

The CJEU's jurisprudence establishes a particularly important distinction between ordinary component failures, which are generally treated as part of the normal operation of air transport, and hidden manufacturing or design defects affecting flight safety, which may be outside the carrier's normal control.

The recent D. S.A. v P. S.A. and Finnair v A judgments are especially important because they deal directly with hidden aircraft-engine and fuel-system design defects.

For actual manufacturer compensation claims, however, Regulation 261/2004 is not itself the complete product-liability regime. Contract law, national tort/delict law, and EU product-liability legislation must also be examined. The new Directive (EU) 2024/2853 is particularly significant for future cases because it expressly addresses defective components and introduces evidentiary mechanisms designed for technically complex products.

Core principle:

Aircraft component failure + proven defect + legally recognized damage + causal connection + identifiable responsible party + applicable contractual/statutory liability regime = potential civil liability.