A light aircraft crashed at Gloucestershire Airport in Staverton after a 3D printed air induction component failed, leading to a loss of engine power.
According to an Air Accidents Investigation Branch (AAIB) report, the accident involved a Cozy Mk IV aircraft, registered G-BYLZ, which crashed on 18 March 2025 at 13:04 GMT following an uneventful local flight. According to a news report, only the pilot was on board. He suffered minor injuries and was taken to hospital. The aircraft was destroyed and damage was caused to the airport’s instrument landing system (ILS) localiser.
During the final approach to Runway 09, the pilot advanced the throttle at around 500 ft. above ground level while preparing to carry out a go around. Instead of responding normally, the engine failed to produce power. With little height remaining and obstacles ahead, the aircraft passed over a road and a line of bushes at the airfield boundary before landing short of the runway and striking the landing aid structure.
Engine failure traced to air induction part
Inspection of the wreckage showed that engine power was lost after a plastic air induction elbow attached to the fuel controller collapsed during the approach. The component severely restricted airflow to the engine after softening under heat from within the engine cowling. Investigators determined the elbow was a 3D printed part that had been fitted during a modification to the aircraft’s fuel system.
Although the modified fuel system had been approved by the Light Aircraft Association (LAA) in 2022 and had accrued 37 flight hours, the air induction elbow itself was not included in the documentation submitted for approval. As a result, its material properties and suitability for use were never independently assessed.
The aircraft owner believed the component had been manufactured from carbon fibre reinforced ABS plastic with a higher temperature tolerance than the epoxy resin specified in the aircraft plans. Testing carried out after the accident showed otherwise, with the material softening at around 53°C, well below the temperature required for reliable operation in that location.
Investigators also noted that the part lacked design features included in the original aircraft plans that would have provided additional structural support when exposed to heat.
In its conclusions, the AAIB said the engine lost power because the 3D printed induction elbow was made from “inappropriate material” and collapsed when heated, leading to the aircraft’s forced landing and collision with the landing aid. In response, the LAA said it intends to issue an alert to inspectors concerning the use of 3D printed parts and to reference the guidance during future permit to fly renewals.
Why certification matters in aerospace AM
As additive manufacturing moves deeper into safety-critical aerospace systems, reliability cannot rest on assumptions or informal adoption. Instead, rigorous certification and independent verification are becoming central to ensuring that 3D printed parts perform safely in the environments for which they are intended.
Across the wider industry, efforts have long been underway to address these risks. The Performance Review Institute (PRI), which administers the Nadcap accreditation program, expanded its auditing framework to cover AM processes used in aerospace production.
Requirements include material traceability, machine and process qualification, operator training, post processing controls, and heat treatment oversight, all aimed at ensuring consistent part quality before components enter service.
In India’s aerospace and defense sector, similar principles are being applied through the Centre for Military Airworthiness and Certification. Working under the Defence Research and Development Organisation (DRDO), CEMILAC introduced structured qualification and certification pathways for 3D printed components, starting with non critical parts and extending toward more demanding applications.
Emphasis is placed on material testing, process control, statistical validation, and alignment with international standards bodies such as ASTM International.
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Featured image shows the G-BYLZ following the accident. Photo via AAIB.
