An unexpected technical defect is not automatically extraordinary. Maintenance and correction of ordinary defects generally form part of an airline’s normal operations.
Legal conditions
Under Wallentin Hermann and later case law, a technical problem exempts the carrier only in special circumstances where it stems from an event outside normal activity and actual control. A hidden manufacturing defect, sabotage or terrorism may differ from wear, component failure or an ordinary maintenance finding.
Evidence for the specific flight
Keep the fault description, discovery time, aircraft registration, aircraft change, repair duration, technical diversion and replacement offers. Maintenance records are normally held by the carrier and must be substantiated in litigation.
Common airline defences
Terms such as safety check, unexpected defect or technical reasons are insufficient. The component, whether the event is inherent in operations and why replacement aircraft, crew or other measures were unavailable must be established.
Other rights beyond fixed compensation
Where there was no extraordinary circumstance and arrival was at least three hours late, fixed compensation may arise. Care and rerouting require separate assessment. The cost of a self arranged replacement flight needs an additional necessity analysis.
Next steps without losing evidence
Request the precise technical cause and document aircraft changes and timing. Do not classify the event as extraordinary too quickly. Then assess distance, final arrival and every alternative measure.
Detailed legal assessment
For Technical defect: when the airline remains liable, territorial scope, the responsible operating carrier, the timeline, the cause and the specific legal consequence must be established separately. An airline’s internal status code is not decisive; verifiable facts are. Ordinary technical problems arising during operation and maintenance generally belong to normal activity. A rare external event or manufacturer-disclosed hidden defect may be assessed differently. The review must also distinguish fixed compensation, reimbursement, rerouting, care and proven additional loss.
Decision matrix for the claim review
This matrix prevents separate legal bases from being mixed together.
| Review question | Required evidence | Legal significance |
|---|---|---|
| Is the defect typical of operations? | fault type and maintenance context | Normal operational risk weighs against exemption. |
| Was there an external cause? | manufacturer notice, sabotage or external interference | May alter the classification. |
| Was repair or replacement available? | fleet and timing data | Relevant to reasonable measures. |
| Did the defect carry through a rotation? | causal chain and planning | Requires concrete organisational evidence. |
Evidence checklist for the file
A robust file contains more than a booking confirmation. For Technical defect: when the airline remains liable, the following material should in particular be preserved:
- technical fault description and timing
- maintenance or release information where available
- location and availability of a replacement aircraft
- rotation plan and actual repair duration
- communications about parts, manufacturer notices or external interference
Case law and practical significance
The judgment in van der Lans, case C-257/14 is particularly relevant to this subject. The Court made clear that an unexpected technical defect is not extraordinary merely because it was unforeseen. Problems arising in normal operation and maintenance are generally attributable to the airline. The judgment does not replace an individual review, but it identifies the legally decisive facts and prevents unsupported airline assertions from being accepted at face value.
Strategic order of assessment
A reliable assessment follows a fixed order:
- Establish the nature, timing and discovery of the technical defect.
- Separate ordinary operational risk from external damage or a hidden manufacturing defect.
- Examine maintenance, parts, replacement aircraft and reasonable operational measures.
- Record the actual delay and effect on arrival at the final destination.
- Quantify compensation and additional expenses from the available evidence.
Related assessment routes
This assessment often connects with other subjects:
Check the claim systematically · Legal review and editorial responsibility
Frequently asked questions
Is an unexpected technical defect extraordinary?
Not merely because it was unexpected. Many defects form part of normal operation. Origin, nature and controllability are decisive.
Which technical events may exceptionally exempt the airline?
Examples may include a hidden manufacturing defect revealed by the manufacturer or authority, sabotage or terrorism. The external cause must be specifically proven.
Must an airline keep a spare aircraft at every airport?
There is no absolute duty to station one everywhere. The real resources, rebooking options and organisational solutions that were reasonably available must still be examined.
Is the explanation safety reasons sufficient?
No. Safety may explain the operational decision but does not automatically prove extraordinary circumstances. The underlying cause and measures must be identified.
Which evidence can a passenger preserve after a defect?
Keep messages, photographs, times, aircraft changes, gate statements and final arrival. Request a specific technical and operational explanation as well.