What happened
On 7 October 2015, an Aero AT4 aircraft, registration 9M-EVA, was taxiing at Seletar Airport following a navigation flight from Singapore to Malaysia and back. While the pilot was proceeding toward an assigned parking bay, the aircraft began to veer left near the junction of Taxiway E3 and Taxiway EP. Despite the pilot's attempts to use the brakes to correct the direction, the aircraft drifted off the taxiway and came to rest on a grass patch near a drain. The impact caused the nose landing gear to break off and resulted in various other damages, including a cracked canopy and dents to the left wing. There were no injuries to the pilot.
The investigation
Investigators examined several potential causes for the deviation, including environmental factors and mechanical failures. Analysis of meteorological data showed a light crosswind of only 2 knots, which was insufficient to cause the veer. Post-accident functional tests of the braking system revealed no mechanical anomalies or seized components. While CCTV footage was reviewed, the resolution was too low to confirm specific pedal inputs. The investigation also looked into the aircraft's maintenance history and regulatory status, noting that the aircraft was operating under a Malaysian Permit-To-Fly that did not extend to Singaporean airspace.