Airbus A321 G-OATW: ground activity belongs in the safety assessment
G-OATW returned to Stansted after a loose cabin window was noticed during climb. The AAIB traced the window damage to high-intensity lights used during filming the previous day.
- Programme
- Airbus A321-253NX, G-OATW
- Year
- 2023
- Sector
- Aerospace & Defence
- Outcome
- Return to Stansted on 4 October 2023; several window components lost, with no injuries.
What happened
The AAIB records that inspection after landing found two window assemblies missing and further windows damaged. The cabin remained pressurised normally during the flight.
What was found
The AAIB concluded that infrared radiation from the filming lights softened the acrylic windows, causing distortion and shrinkage. The distorted windows fell out under vibration or pressure differential during climb.
The AAIB found that the lights were closer than their datasheet recommended, and the person setting them up was unaware of that datasheet. The filming risk assessment focused on personnel safety; nobody involved anticipated damage to the acrylic windows.
Engineering lesson
The assurance lesson is to treat non-routine ground activities as changes to an aircraft's exposure conditions, even when its design and configuration remain unchanged.
An activity-level risk assessment should connect external equipment limits to aircraft material limits. These are requirements and assurance lessons drawn from the report, not additional AAIB causal findings.
The practice this points to
For non-routine ground activities, link the activity plan to equipment datasheets, affected aircraft components, exposure assumptions and the engineering owner responsible for assessing them.
Turn vague controls such as keeping equipment sufficiently far away into justified, measurable limits and recorded checks. Flag missing supplier data or uncertain combined effects for engineering resolution before approval.
Reassess the linked hazards and verification needs whenever equipment, positioning, duration or protective arrangements change; retain the engineer's approval with the revised plan.
Where Kelvora fits
Kelvora is an AI-powered requirements & assurance platform that supports traceability and change-impact review, with engineers approving its proposals.